This is a remote position. We are seeking a Senior Frontend Engineer - React JS to join our team. As a Frontend Engineer, you will be working on different types of products from websites to enterprise platforms. As part of a cross-functional team focused on delivery, you will be responsible for carving the visuals of the entire product. Responsibilties: Building the next-generation web applications with a focus on the client’s vision. Mentoring team members and involved in the hiring process. Participating actively in the design process along with code review. Working closely with the concerned stakeholders on the feasibility of upcoming changes & providing accurate timelines of work. Exploring, communicating, and implementing Frontend best practices within the organization. Staying ahead of the game and up to date with the latest the field has to offer. Collaborate with UX/UI designers to translate design concepts into responsive and interactive user interfaces. Implement pixel-perfect designs with a focus on user experience and usability. Develop and maintain robust and scalable web applications using React.js. Implement state management using tools like Redux or Context API. Integrate with backend services and APIs to ensure seamless data flow. Build reusable and efficient React components and libraries. Optimize components for maximum performance across various devices and browsers. Write clean, well-documented, and modular code. Conduct unit testing and participate in code reviews to maintain code quality standards. Ensure the responsiveness of applications for a variety of devices and screen sizes. Implement responsive design principles and techniques. Collaborate with cross-functional teams, including backend developers, designers, and product managers. Work closely with backend developers to integrate frontend components with server-side logic. Identify and address performance bottlenecks. Optimize applications for maximum speed and scalability. Stay informed about the latest trends and best practices in frontend development. Continuously enhance your skills and share knowledge within the team. Requirements Bachelor's degree in Computer Science, Engineering, or a related field. Minimum of 4 years of experience in React JS. Experienced with Agile methodology. Strong knowledge of the concepts and paradigms. Ability to juggle more than one language and framework. Solid understanding of CS fundamentals; algorithms, data structures, and time and space complexity. Experienced with the following: Typescript or other statically typed language, GraphQL is a plus, building cross-platform mobile. applications using JavaScript (Ionic, ReactNative) and familiar with Reactive Programming (RxJS). Excellent communication and interpersonal skills, with the ability to effectively collaborate and influence cross-functional teams. Strong grasp of the English Language (writing and speaking). Previous experience dealing with client-side testing patterns. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a Developer Full Stack .Net - Pl to join our team. who wants to work in international Scrum teams with a global leading-market software, in an environment of continuous professional development and teamworking. Responsibilites: Develop and modernize software applications using best practices in coordination with a distributed team. Have an advanced understanding of software development methodologies and the demonstrated ability to design and develop complex software systems. Contribute to design choices where necessary. Contribute in all aspects of an Agile software development process including: design, programming, testing, documentation, quality assurance and implementation. Looks forward to leveraging “innovation time” to work on pet projects and special areas of interest. Requirements Experience with Domain Driven Design (DDD) software development practices. A good understanding of design patterns and N-Tier architecture. SaaS based software development experience on large to enterprise class applications. Experience designing applications iteratively with continuous collaboration between business and tech. Good communication and collaboration skills High-intermediate English level Minimum requirements: C# / .Net CoreGIT Java Script angular Database – SQL REST SOAP Postman AWS Datadog Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a Senior Fullstack Engineer (Typescript and Vue.js) to join our team. you'll work on Umami, the flagship Tezos wallet, either by developing new features or building a mobile application from the ground up. In the Applications team, you'll contribute to high-level projects such as NFT initiatives for Manchester United and develop new on-chain applications across Sports, DeFi, and Gaming. Requirements Proficiency in TypeScript and modern frontend frameworks (e.g. React, Vue, or Next.js), along with experience in any modern backend language. Strong foundation in computer science fundamentals, including algorithms, data structures, and concurrency. Creative and analytical mindset, with the ability to develop innovative solutions for complex challenges. Experience building user-friendly, product-centric technology with a focus on seamless user experiences. Solid understanding of software engineering best practices, including version control, code reviews, and continuous integration. Excellent interpersonal and communication skills. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a Lead Software Engineer (Ads) to join our team. Responsibilties: Leading the development of several high-impact initiatives related to the Ad Network. Building predictive models to enable our platform and admin team to deliver a stronger ROI for our advertisers. Building fraud detection systems to improve the quality of data integrity via the ad network. Prioritizing and triaging a backlog of in-demand feature requests and bugs. Transitioning our tech ecosystem into a more robust and performant version of itself, continuously optimizing for scale. Documenting your thought processes and development. Bringing new ideas to work, suggesting creative solutions, and collaborating with others to bring the absolute best product to market. Requirements 5+ years of relevant work experience. Experience with Ruby on Rails, react, and typescript. Experience building Ad Tech and core infrastructure for ad networks at scale. Ability to leverage big data to build predictive models. Experience building advanced fraud detection systems. Exceptional understanding of REST APIs. Comfortable writing thorough tests and prioritizing QA and related processes. Strong troubleshooting skills. Experience working with an agile development team. Nice to have: Experience with machine learning. Experience using Heroku, Sentry, Github. Familiarity with email-specific topics. Experience working on small, highly productive engineering teams. Experience optimizing high throughput postgres databases. Keen design eye and a passion for building great user experiences. Experience with Redis, Sidekiq, Python, and Remix.js. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a Fullstack Engineer (Frontend Frameworks and React) to join our team. You will play a key role in designing, developing, and scaling our products. You’ll work closely with the CTO and co-founder and engineering and product team to drive new feature development across the stack, improving both the frontend user experience and backend infrastructure. Responsibilities: Design, develop, and maintain scalable web applications across the full stack. Build and optimize responsive, high-performance user interfaces. Develop and maintain backend services and APIs that power our platform. Collaborate with product, design, and engineering teams to rapidly build, test, and iterate on features within our existing platform. Debug production issues across our systems, ensuring reliability and performance. Advocate for best practices in code quality, testing, and maintainability. Work independently and collaboratively to solve complex technical challenges. Requirements 4+ years of experience building and shipping full-stack web applications. Proficiency in React (or similar frontend frameworks) and Python. Experience designing and working with GraphQL, RESTful APIs and databases (SQL and NoSQL). Strong understanding of modern frontend development, including TypeScript, React, component-driven architecture and modern tooling. Experience with cloud platforms (AWS, GCP, or Azure) and deployment best practices. A combined passion for great user experience and scalable backend systems. Strong problem-solving skills and ability to work autonomously in a fast-paced environment. Startup experience is a plus, but not required. Bonus: Experience with Flask, SQLAlchemy , WebSockets, and integration-heavy systems. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a QA Automation Engineer (.NET and C#) to join our team who will perform automation testing. This role plays a vital part in delivering high-quality and highly efficient software, web, and mobile applications to customers and users. Responsibilties: Responsible for automated testing of our front end, backend, and mobile apps. Identify, record, track, and report on defects found. Automate API testing workflows and integrate them into CI/CD pipelines. Troubleshoot and resolve automation test failures in the pipelines. Work with the development team to correct bugs and errors. Create tools and automation to profile performance and application efficiency. Provide Code Reviews for development efforts. Requirements Bachelor's in Computer Science or Software Engineering. 5+ years experience in software QA automation testing. At least 1 year of professional experience coding in.NET/C#. Must have experience with Postman and managing collections. Full Understanding of WebSocket, REST and JSON. Has the ability to setup and maintain frontend, backend, and mobile automation frameworks. Experience with scoping, sizing and overseeing multiple concurrent projects, assessing the appropriate level of risk-based testing, and reviewing team deliverables. Experience working within a trading or financial organization. Great communication and coordination skills and able to work efficiently under pressure. Highly analytical and a quick problem solver. Preferred skills & experience: JMeter, K6, or other load-testing tools and experience. Passionate and knowledgeable about the blockchain and Crypto space. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a Senior/Staff Software Engineer (Database Internals) to join our team. As a part of our engineering team, you’ll collaborate with other team members to contribute to process improvements, give product and architectural feedback, and work towards making Readyset more robust and feature-complete. Responsibilties: Design, build, and maintain core components of Readyset, with a focus on performance, scalability, and reliability. Provide technical leadership by guiding architectural decisions, and advocating for robust, scalable, and supportable systems. Collaborate cross-functionally to translate user needs and product goals into technical solutions. Contribute to and help shape engineering processes that prioritize code quality, system observability, and operational excellence. Communicate complex technical concepts clearly and effectively; both in writing and verbally with internal stakeholders and external contributors. Actively share your work and insights through blog posts, tech talks, and other channels to help establish Readyset as a go-to resource in the data infrastructure space. Requirements 8+ years of hands-on software engineering experience and 6+ years of experience working on database internals including relational data, query processing, query optimization, or caching. Considerable expertise in compilers, systems programming, concurrency, caching, batching, etc. Fluency in one of the following: Rust, C, C++, Golang, or other systems programming languages. Bachelor's degree in Computer Science, Engineering, or a related field. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a Analytics Engineer (Snowflake and Databricks) to join our team. This role requires a strong foundation in SQL, experience with data warehouses, and the ability to work cross-functionally with different teams including presenting to executives. If you enjoy rolling up your sleeves, tackling complex data challenges, and driving business impact through data, this role is for you. Responsibilties: Design, develop, and optimize SQL queries to support data transformations, reporting, and analytics. Work with modern data warehouses (e.g., Snowflake, Databricks, Redshift) to ensure efficient data storage and retrieval. Build and maintain ETL/data pipelines using tools like Matillion and Snowflake (experience with other tools is relevant). Partner with business teams to understand data needs, improve reporting capabilities, and drive insights. Interface with executives and stakeholders to present findings and influence data-driven decisions. Support and guide best practices for data modeling, data governance, and data integrity. Work with Salesforce data and contribute to tracking key business metrics such as SaaS subscription renewals and customer analytics. Collaborate across departments to improve data collection, reporting, and analytics processes. Utilize Python for automation, data processing, and enhancing ETL workflows. (Nice to have) Work with data visualization tools like Tableau or Power BI to develop dashboards and reports. Requirements Strong SQL skills – you should be comfortable writing complex queries and optimizing them for performance. Experience working with modern data warehouses (Snowflake, Databricks, Redshift, etc.). Hands-on experience with ETL/data pipeline tools (Matillion preferred, but experience with others is relevant). Business acumen – you understand SaaS metrics, subscription models, and how businesses operate. Ability to work with Salesforce data and structure reporting for business insights. Strong communication skills – you can interface with executives, translate business needs into data solutions, and collaborate across teams. A problem-solving mindset – you proactively identify issues and propose solutions that improve data quality and reporting. Experience with Python for scripting, automation, or light data engineering tasks. A roll-up-your-sleeves attitude – you’re not afraid to jump in and tackle a variety of tasks to support the business. 2-3+ years of real-world experience applying these skills in a business setting. Nice to Have (But Not Required): Experience with data visualization tools like Tableau or Power BI. Understanding of best practices for reporting, data modeling, and business intelligence. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. Wea are seeking a Senior DevOps Engineer (AWS and ECS) to join our team. Responsibilties: Enjoy simple and well crafted solutions. You likely feel that people often make things more complicated than they need to be. Enjoy uniformity and abhor having 3 different approaches to do the same thing. Enjoy automating tasks once they are well understood, but not before. Enjoy collaboration, but can drive the team to make decisions and are not easily blocked. Are a student of coding best practices and strive to improve your software development skills. Likely have a CS (or similar) degree and have held a Software Engineer title in the past, but this is not required. Requirements Deep hands-on experience with AWS services (e.g., EC2, ECS, Lambda, RDS, IAM, VPC, etc). Strong python coding skills with knowledge of package management options and challenges. Strong IaC knowledge - Terraform and Pulumi experience preferred. Hands-on experience building and managing CI/CD workflows - preferably with CircleCI and Guthub Actions. Experience with SQL databases. Experience with additional programming languages (especially Java and js) is a plus. Experience building internal tools used to help the business run more efficiently is a plus. Experience working with data management pipelines is a plus. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a Senior Platform Engineer (Python) to join our team. You will play a pivotal role in architecting, implementing, and managing services that power our cutting-edge platform. Your expertise in No-SQL database implementation, continuous integration, web application development, and best practices for writing robust, readable, and well-tested code will ensure the highest quality product for our users. You will also be utilizing groundbreaking technologies like LLMs to enhance your coding capabilities and push the boundaries of software development. Responsibilites: Architect, develop, and maintain scalable and efficient backend services using Python (FastAPI). Utilize continuous integration to ensure code quality and streamline the development process. Leverage advanced technologies and philosophies, such as ai, continuous integration, and continuous improvement to enhance productivity and innovation. Contribute to the development of best practices, guidelines, and documentation. Actively participate in paired programming, providing constructive feedback and support to your peers. Provide authoritative perspective on No-Sql database implementation from all dimensions. Requirements 8+ years of professional experience in a Python backend development role. Strong experience in architecting, implementing, and optimizing backend services. Strong expertise with respect to No-Sql databases. Familiarity with continuous integration and deployment processes. Experience using AI-powered coding tools. Comfortable consulting stack overflow, implementing existing libraries, and otherwise working to deliver great software without re-inventing the wheel. Strong understanding of software development best practices and principles. Excellent communication and collaboration skills. Benefits Work Location: Remote 5 days working Show more Show less

This is a remote position. We are seeking a Software Engineer (Backend) to join our team. Responsibilties: Design and Implement Scalable Servers in Rust: Build high-performance servers deployed on AWS that interface with the Solana network and Orca's web application. Develop Data Processing Pipelines: Create systems for processing blockchain data, focusing on reliability and latency. Advance Application Features: Leverage these servers to develop key application features such as real-time monitoring, automated transaction execution, and token balance analytics. Manage Database Interactions: Handle data storage and management using PostgreSQL, ensuring data integrity and efficient retrieval. Requirements Proven Track Record: You’ve worked on performant services at scale, ideally in finance or adjacent industries. You have a strong ability to analyze complex software systems, reason about them with clarity, and solve problems efficiently. Educational Background: Bachelor’s or Master’s degree in Computer Science or a related field from a recognized university. Balanced Mindset: Comfortable working independently in an async environment, but also enjoy coming together to collaborate as a team. Passionate about certain technologies and patterns, but recognize their trade-offs in different scenarios. Technical Skills: Experience with Rust is a plus but not required. Strong interest and proficiency in building high performance backend systems. AI Forwardness: We’re looking for flexible thinkers who are open to leveraging AI tools to enhance developer productivity and workflows. You’re curious about the evolving AI landscape and willing to adapt development practices as the tools mature. Understanding of DeFi: You have a good understanding of how AMMs work and the Solana ecosystem. You are a user of DeFi apps on Solana or other chains. Benefits Work Location: Remote 5 days working

This is a remote position. We are seeking a Staff Mobile Engineer to join our team. Responsibilties: Advanced Application Development: Contribute to the development and continuous improvement of our mobile application with a focus on performance, scalability, and security. Supportive Cross-Functional Collaboration: Support collaborative efforts across engineering, design, marketing, and operations teams to enhance mobile projects and ensure aligned progress. Project Contribution: Assist in managing the delivery of key mobile app projects, including UI/UX enhancements and new feature rollouts. Technological Adaptation: Stay updated on new mobile app development trends and technologies, applying this knowledge to suggest and implement improvements. Mentorship and Guidance: Provide mentorship to less experienced team members, sharing knowledge and promoting a culture of learning and growth within the team. Requirements Expertise: 12+ years total in software engineering, with 8+ years in mobile app experience. Proven Mobile App Development Experience: Strong background in mobile application development with a portfolio of past projects that demonstrate your skill and innovation. Software Engineering Expertise: A strong foundation in software engineering, bolstered by significant experience in developing mobile applications, ensuring a blend of theoretical knowledge and practical application. Programming Language Proficiency: Demonstrated hands-on expertise in React Native for developing and maintaining high-quality cross-platform mobile applications. Framework Knowledge: Experience with mobile app development frameworks and tools, understanding the full mobile development lifecycle. Integration Skills: Ability to integrate various cloud services and backend infrastructure into mobile applications. Analytical Abilities: Excellent analytical skills with a proven ability to tackle complex problems effectively. Benefits Work Loaction: Remote 5 days working

This is a remote position. We are seeking a Senior Software Engineer: Numerical and High Performance Computing to join our team. Responsibilites: Work with modern numerical computing and deep learning technology. Contribute to open-source projects like PyTorch, TorchRL, TorchAO, and Triton. Use C++, CUDA, Python, C, and MLIR. Develop new features, performance enhancements and help maintain code with millions of users. Interact with the PyTorch development community, users, and our clients who are building PyTorch and building with PyTorch. Collaborate with, learn from, and mentor team members. Be a part of the Python community. Requirements Prior experience with particular packages like PyTorch or NumPy is nice to have but certainly not required. If you have expertise in languages like C++, Python, and CUDA and can find your way around large code bases, we expect you can learn about any new library or project quickly. We also highly value good communication skills. Knowledge of deep learning is of benefit. We aim to help you grow within company and within the Python open source community. Benefits Work Location: Remote 5 days working

This is a remote position. We are seeking a Software Engineer - GNN Expert to join our team. The Full Stack Engineer will be responsible for both front-end and back-end development, software development, and using Cascading Style Sheets (CSS) to create a seamless user experience. Responsibilities: Front-end and back-end development Software development, Using Cascading Style Sheets (CSS) to create a seamless user experience. Requirements Back-End Web Development and Full-Stack Development skills Front-End Development and Cascading Style Sheets (CSS) skills Experience in software development Strong problem-solving skills and attention to detail Ability to work in a team and independently Bachelor's degree in Computer Science, Engineering, or related field Benefits Work Location: Remote 5 days working

This is a remote position. We're looking for an Infrastructure Engineer to help build and operate the foundational systems. Responsibilities: Designing and implementing infrastructure to support automated deployments of the OP Stack across multiple environments. Owning critical pieces of infra from design through production with a focus on reliability, observability, and operational efficiency. Managing and evolving our Kubernetes-based infrastructure, ensuring reliability, scalability, and developer-friendly interfaces. Collaborating closely with protocol engineers to understand their needs deeply and unblock development across the stack. Requirements Web3 experience: You’ve run, deployed, or contributed to blockchain infrastructure (e.g., running full nodes, working on validator infra, etc.). Experience running containerized systems in production using Kubernetes. Proficiency with Infrastructure-as-Code tools like Terraform, Ansible, Helm, or similar. Software engineering skills with Golang or another backend language; you think in systems, not scripts. A strong bias for ownership and high-agency mindset—you proactively seek out problems and solve them. Experience building tools that accelerate developer workflows and improve internal platform capabilities. Benefits Work Location: Remote 5 days working

This is a remote position. We are looking for Lead Site Reliability Engineer to join our team. Responsibilities: Provide tech leadership in SRE execution and planning Lead complex infra projects for both internal and external stakeholders Orchestrate and run our infrastructure Add to and tune our monitoring Reduce or automate manual processes Be on an on-call (PagerDuty) rotation to respond to incidents that impact availability Plan the growth of our infrastructure as we continue to scale Vendor management Manage the technical roadmap for the SRE team Infrastructure cost monitoring and optimisations Supporting engineers and improving development workflows Talk directly to large customers Co-ordinate with team members across timezones Requirements Build a technical competent SRE team through a clear set of OKRs Build essential tooling to improve the infra ops Have run global mission-critical infrastructure Have managed systems that handle high request volumes Know your way around Linux and the Unix Shell Have used configuration management systems Have used infrastructure automation tools Have implemented CI / CD pipelines Have experience with some of the following technologies: Kubernetes Docker Terraform Ansible Nginx Github Actions Grafana Prometheus Loki AWS Google Cloud Major CDN vendors Github Actions, Workflows, managing self-hosted runners Video streaming technologies (HLS, RTMP, transcoding etc.) COBOL Web3 / Blockchain, particularly the Ethereum ecosystem Benefits Work Location: Remote 5 days working

This is a remote position. We’re looking for a Principal Engineer to take full technical ownership of our product roadmap and systems architecture. Responsibilities: Own the technical roadmap and platform architecture to ensure scalability, security, and reliability Drive roadmap execution by partnering with Product to define technical milestones and lead end-to-end delivery Lead AI & automation initiatives, integrating third-party services and building in-house tools that streamline business processes Write and review code, establish engineering best practices, and guide system design standards Collaborate cross-functionally with internal teams and external development partners as a technical leader and mentor Manage and maintain core systems, including our CRM, EHR, RCM tools, and data infrastructure Plan for scale, proactively resolving performance bottlenecks, tech debt, and system constraints Oversee vendor performance, evaluating engineering consultants and ensuring quality delivery across all teams Requirements 8–10+ years of full-stack engineering experience Deep backend experience with Node.js, Python, or Go Frontend expertise with frameworks like React or Vue Proven success leading architecture in production environments at scale Strong API design skills and experience building secure, distributed microservices Experience with healthcare systems—HIPAA, HL7, FHIR, EHRs, and payer APIs Hands-on experience integrating AI/ML (e.g., LLMs, NLP, document automation, RAG systems) Familiarity with DevOps tools, CI/CD workflows, IaC, and observability (Azure preferred) Excellent communication skills across technical and non-technical teams Benefits Work Location: Remote 5 days working

This is a remote position. We are seeking an experienced Lead Platform/DevOps Engineer to join our growing development team. Responsibilities : Work closely with software engineers and product managers to design and implement high performance, available and scalable solutions based on business requirements Develop and maintain CI/CD pipelines (Github Actions) to automate software builds Develop and maintain GitOps workflows (ArgoCD) to deploy software declaratively Deploy and manage cloud infrastructure via IaC (Terraform) Manage and maintain Kubernetes and VMs Develop and maintain logging and monitoring strategies (Datadog) Advocate for and build with a strong focus on security Provide on-call support to ensure end users continue to have the best experience Mentor junior team members, providing technical guidance and support Educate team members on working with key tools/platforms/concepts such as Azure, GitOps, IaC, Docker Requirements 5+ years of Cloud Infrastructure/Azure experience 5+ years of Linux/Unix experience 3+ years of hands-on experience with containerization and orchestration tools like Kubernetes and Docker, infrastructure as code (IaC) with Terraform, and continuous delivery with ArgoCD and GitOps. Proficiency in setting up CI/CD pipelines, particularly using GitHub Actions. 3+ years of networking experience 3+ years of scripting/development experience 2+ years of monitoring and logging experience, with familiarity using tools like Datadog Demonstrated commitment to security-minded and scalable infrastructure design Willingness to participate in an on-call rotation Experience with mentoring junior team members Experience working in a dynamic, fast-growing organization. (Preferred) Knowledge of Databricks (Preferred) Background in SaaS or product-focused engineering (Preferred) Benefits Work Location: Remote 5 days working

This is a remote position. Looking for a skilled Back-End Developer to build and maintain scalable, secure systems powering a conversational AI platform in the healthcare domain. Requirements Design and develop scalable APIs and microservices for conversational AI workflows. Optimize backend performance, scalability, and reliability. Integrate securely with healthcare systems, ensuring compliance (HIPAA, FHIR). Deploy and manage NLP/AI models in production. Design database schemas and manage structured/unstructured healthcare data. Build and maintain CI/CD pipelines. Troubleshoot complex issues to minimize downtime. Mentor junior developers and contribute to technical excellence. Explore and adopt emerging backend technologies. Benefits Work Location: Remote 5 days working

This is a remote position. We are seeking an experienced Senior Python Engineer to lead backend development, drive system design, and mentor a high-performing team. Opportunity to grow into Lead/Principal Developer roles. Responsibilities : Develop scalable, high-performance applications using best practices. Work with Flask/FastAPI and NoSQL databases (MongoDB/MongoDB Atlas). Design and maintain microservice-based architectures. Collaborate with cross-functional teams on project delivery. Lead code reviews, testing, documentation, and CI/CD efforts. Mentor backend engineers and uphold code quality. Follow Agile development practices. Requirements 4+ years in full software development lifecycle 4+ years with Python and frameworks like Flask/FastAPI Experience with MongoDB (especially MongoDB Atlas) and PyMongo Exposure to microservices architecture Nice to Have: Experience with Kubernetes, GCP/AWS, Cloud Run, S3 Strong system design and debugging skills Product-centric mindset and collaborative approach Leadership in design or architecture efforts Benefits Work Location: Remote 5 days working