FreJun

Position Overview: We are looking for a talented VoIP Engineer to join our dynamic team. The ideal candidate will possess solid expertise in VoIP technologies, including Kamailio, FreeSWITCH, SIP, and WebRTC, along with practical experience in networking, AWS cloud services, and Linux system administration. This role is perfect for someone who enjoys problem-solving, collaborative teamwork, and working in a fast-paced technology-driven environment. Key Responsibilities Design, deploy, and maintain VoIP infrastructure using Kamailio, FreeSWITCH and related tools. Configure and troubleshoot SIP and WebRTC protocols. Administer and optimize Linux-based servers for performance and reliability. Monitor network performance, manage network infrastructure, and troubleshoot networking issues. Deploy and manage infrastructure on AWS, leveraging relevant cloud technologies. Document infrastructure setup, configuration, and procedures. Collaborate closely with other teams (Backend, QA, Operations) to support the overall infrastructure strategy. Participate in on-call rotations and respond effectively to infrastructure incidents. Qualifications & Requirements Minimum 2+ years of experience with VoIP applications. Hands-on experience with Kamailio and FreeSWITCH. Solid understanding of SIP, RTP, WebRTC and Websockets. Proven Linux system administration experience (Ubuntu/Debian preferred) Familiarity with networking concepts (TCP/IP, TLS, VPN, IP Addressing, NAT Traversal) Practical experience with AWS services such as EC2, S3, VPC, and RDS. Understanding of Docker and scalable deployment strategies. Desired Soft Skills Strong analytical and problem-solving skills. Excellent communication and interpersonal skills. Self-motivated, proactive, and able to work effectively in a team. Organized with the ability to manage multiple priorities simultaneously. Adaptable, eager to learn new technologies, and committed to continuous improvement. Show more Show less

QA/QC Engineer at Frejun We are looking for a QA/QC Engineer to ensure the quality of our software features throughout the development process. This role involves using automated and manual testing, providing status reports, verifying defects, and approving features and release candidates. You will be responsible for creating and executing test plans and test cases, significantly impacting our software's quality and delivery speed, benefiting our business and customers. Collaborating closely with developers, product managers, and other QA engineers, you will help ensure the high quality of delivered features. Furthermore, you will have the chance to suggest enhancements to our current processes and automated tools to boost the team's speed, quality, and efficiency. Key Job Responsibilities Collaborate and influence cross-functional teams including developers, product managers, and other team members to understand software quality requirements and design effective test strategies. Define release planning and provide input on the readiness of software for production deployment. You will be working with the QA Team to test code at a user level - both manually and with automated tools - to ensure highest quality product delivery. Collaborate with peers to help drive the software development process toward quality-centric methodologies. Work with component teams to identify the pain points in their area and provide technical guidance. Create, maintain, and execute test cases, test scripts, and test scenarios for various software components, including functional, regression, performance, and security testing. Perform root cause analysis of complex issues and work with the development team to resolve issues and enhance the overall product quality. Stay up-to-date with industry trends, emerging technologies, and best practices in QA and testing, and apply this knowledge to continuously improve testing processes. Define key metrics for measuring and reporting on the quality of software products and test effectiveness. Adhere to standard quality assurance best practices and publish regular quality metrics Minimum Requirements 2-3 years of Quality Assurance Engineering experience, preferably in Automation Testing. Have proficiency in Python test automation with experience in any of the frameworks (PyTest, Playwright (preferable), Selenium, or Cypress) Have experience in API testing and web services using tools like Postman, REST Assured, or similar. Have experience in virtualization technologies such as Docker/Kubernetes/VMware to create and manage test environments efficiently. Be comfortable working with CI/CD tools such as Jenkins Have experience in Agile environments and proficiency with JIRA,No Confluence, Git. Good To Have : Familiarity with WebSockets for real-time features. Prior experience working with VoIP/Real-time communication technologies: WebRTC, SIP, IP PBX Have experience in Mobile Testing using Appium Have hands-on experience with writing tests for Django applications. Demonstrated knowledge of testing one or more of the following: server performance, API interfaces, databases, file systems, operating systems, network performance and storage. Having experience in Performance Testing using JMeter/K6. Be comfortable in Unix/Linux environments with scripting capabilities. Show more Show less

About The Role We are seeking a Senior Full-stack Developer with a strong focus on backend development to handle feature requests, scaling challenges, and core infrastructure enhancements as the company continues to grow. The ideal candidate will have expertise in Python & JavaScript and hands-on experience with React.js on the frontend. Key Responsibilities: Design, implement, and maintain scalable backend systems using Python and Node.js. Collaborate with the frontend team to integrate backend APIs, ensuring seamless data flow and system interoperability. Optimize and manage data stores including PostgreSQL, MySQL, as well as caching/messaging systems like Redis and RabbitMQ for performance, reliability, and scalability. Manage and deploy cloud infrastructure using AWS services such as EC2, RDS, and S3. Architect, deploy, and monitor containerized microservices for fault-tolerance and horizontal scaling. Identify bottlenecks, perform system diagnostics, and implement optimizations to ensure performance at scale. Minimum Requirements 3+ years of experience as a Full-stack or Backend developer. Proficiency in either Python (Django, Flask, FastAPI) or JavaScript (Node.js, Express.js). Hands-on experience with front-end frameworks like React.js, Vue.js Strong understanding of relational databases (PostgreSQL, MySQL) and caching/messaging systems (Redis, RabbitMQ) Familiarity with AWS core services (EC2, RDS, S3) for cloud infrastructure. Solid knowledge of Algorithms, Data structures, and CS fundamentals. Good To Have Knowledge of building SPAs using React.js or other JavaScript frameworks. Familiarity with WebSockets for real-time features. Prior experience working with VoIP/Real-time communication technologies: WebRTC, SIP, IP PBX Key Traits We Value: Smart, logical, and curious problem-solvers. Hardworking individuals with a passion for learning and adapting to new challenges. What We Offer Competitive salary A collaborative and innovative work environment. Opportunities to work on impactful and challenging projects as part of a growing team. Show more Show less

✅ Job Title Backend Developer – Django (DRF) | AWS | PostgreSQL 🏢 Company Overview At FreJun , we're revolutionizing the way businesses communicate by building intelligent voice communication solutions that are fast, reliable, and scalable. Our backend team powers the core infrastructure that handles real-time calling, transcription, and seamless integrations with third-party tools. We are looking for a skilled Backend Developer to join our mission-driven team and help us scale our backend systems as we grow. 🚀 Tech Stack Languages: Python Framework: Django, Django REST Framework (DRF) Database: PostgreSQL Infrastructure: AWS (EC2, S3, RDS, etc.) Others: Celery, Redis, Docker 👩‍💻 Key Responsibilities Design, develop, and maintain backend services and APIs using Django and DRF. Build and manage scalable database schemas and optimise SQL/ORM queries. Implement background tasks using Celery. Work with AWS services like S3, EC2, RDS etc for deployment and data management. Write clean, maintainable, and testable code. Participate in code reviews and technical discussions. Collaborate with front-end developers, DevOps, and product managers to deliver high-quality features. ✅ Requirements Strong experience with Django and Django REST Framework. Proficient in PostgreSQL with deep understanding of relational database design. Experience working with Celery for task queues and Redis as broker/cache. Proficient in using AWS services such as S3, EC2, RDS, and basic networking/security concepts. Experience with Docker for containerisation and familiarity with Docker Compose. Understanding of RESTful API design principles and best practices. Familiarity with Git and collaborative development workflows. 💡 Nice To Have Experience with AWS deployments. Familiarity with monitoring tools (Grafana, Sentry, etc.). Knowledge of unit testing, integration testing, and automated testing frameworks. 🎓** Qualifications:** Bachelor’s degree in Computer Science, Engineering, or related field (preferred, not mandatory). 2–5 years of relevant experience in backend development. 📍 Location: Remote 🕐 Employment Type Full-time 💰 Compensation Competitive; based on experience and skillset Show more Show less

We are looking for a Backend Developer Intern to join our team. The ideal candidate will have hands-on experience with Python & Django and a strong understanding of relational databases. Key Responsibilities Develop RESTful APIs and backend services using Django Write clean, efficient, and testable code Collaborate with frontend developers and other team members Participate in code reviews Minimum Requirements Strong understanding of Python fundamentals Hands-on experience with Django or similar web frameworks Strong understanding of relational databases (PostgreSQL, MySQL) Experience with Git and version control A strong foundation in computer science fundamentals, including algorithms and data structures. Good problem-solving and communication skills

Job Title: Senior Backend Developer Location: Remote About The Role We are seeking a Senior Backend Developer to lead feature development, tackle scaling challenges, and enhance core infrastructure as our company grows. The ideal candidate will bring deep expertise in Python and infrastructure design for high-performance applications. Key Responsibilities Design, implement, and maintain scalable backend systems primarily using Python (Django, Flask, FastAPI) Optimize and manage relational databases like PostgreSQL and MySQL for high performance and reliability. Design and operate messaging and caching systems like Redis and RabbitMQ for asynchronous processing and scalability. Architect, deploy, and monitor containerized microservices with a focus on fault-tolerance and horizontal scaling. Manage and provision cloud infrastructure using AWS services such as EC2, RDS, and S3. Perform system diagnostics, identify bottlenecks, and implement optimizations to ensure sustained performance at scale. Minimum Requirements 3+ years of experience as a Backend Developer. Proficiency in Python frameworks such as Django, Flask, or FastAPI. Solid experience with relational databases (PostgreSQL, MySQL). Deep understanding of Redis and RabbitMQ for messaging and caching. Familiarity with AWS core services (EC2, RDS, S3) for managing cloud infrastructure. Strong grasp of data structures, algorithms, and software engineering fundamentals. Good To Have Experience working with JavaScript and frontend frameworks like React.js or Vue.js. Familiarity with WebSockets for real-time communication features. Exposure to VoIP or real-time communication technologies such as WebRTC, SIP, and IP PBX. Key Traits We Value Smart, logical, and curious problem-solvers. Hardworking individuals with a passion for learning and adapting to new challenges. What We Offer Competitive salary A collaborative and innovative work environment. Opportunities to work on impactful and challenging projects as part of a growing team. Reach out to us at recruiter@frejun.com

✅ Job Title Backend Developer – Django (DRF) | AWS | PostgreSQL 🏢 Company Overview At FreJun , we're revolutionizing the way businesses communicate by building intelligent voice communication solutions that are fast, reliable, and scalable. Our backend team powers the core infrastructure that handles real-time calling, transcription, and seamless integrations with third-party tools. We are looking for a skilled Backend Developer to join our mission-driven team and help us scale our backend systems as we grow. 🚀 Tech Stack Languages: Python Framework: Django, Django REST Framework (DRF) Database: PostgreSQL Infrastructure: AWS (EC2, S3, RDS, etc.) Others: Celery, Redis, Docker 👩‍💻 Key Responsibilities Design, develop, and maintain backend services and APIs using Django and DRF. Build and manage scalable database schemas and optimise SQL/ORM queries. Implement background tasks using Celery. Work with AWS services like S3, EC2, RDS etc for deployment and data management. Write clean, maintainable, and testable code. Participate in code reviews and technical discussions. Collaborate with front-end developers, DevOps, and product managers to deliver high-quality features. ✅ Requirements Strong experience with Django and Django REST Framework. Proficient in PostgreSQL with deep understanding of relational database design. Experience working with Celery for task queues and Redis as broker/cache. Proficient in using AWS services such as S3, EC2, RDS, and basic networking/security concepts. Experience with Docker for containerisation and familiarity with Docker Compose. Understanding of RESTful API design principles and best practices. Familiarity with Git and collaborative development workflows. 💡 Nice To Have Experience with AWS deployments. Familiarity with monitoring tools (Grafana, Sentry, etc.). Knowledge of unit testing, integration testing, and automated testing frameworks. 🎓** Qualifications:** Bachelor’s degree in Computer Science, Engineering, or related field (preferred, not mandatory). 2–5 years of relevant experience in backend development. 📍 Location: Remote 🕐 Employment Type Full-time 💰 Compensation Competitive; based on experience and skillset

Key Responsibilities: Design, implement, and maintain scalable backend systems primarily using Python (Django, Flask, FastAPI) Optimize and manage relational databases like PostgreSQL and MySQL for high performance and reliability. Design and operate messaging and caching systems like Redis and RabbitMQ for asynchronous processing and scalability. Architect, deploy, and monitor containerized microservices with a focus on fault-tolerance and horizontal scaling. Manage and provision cloud infrastructure using AWS services such as EC2, RDS, and S3. Perform system diagnostics, identify bottlenecks, and implement optimizations to ensure sustained performance at scale. Minimum Requirements: 3+ years of experience as a Backend Developer. Proficiency in Python frameworks such as Django, Flask, or FastAPI. Solid experience with relational databases (PostgreSQL, MySQL). Deep understanding of Redis and RabbitMQ for messaging and caching. Familiarity with AWS core services (EC2, RDS, S3) for managing cloud infrastructure. Strong grasp of data structures, algorithms , and software engineering fundamentals. Good to Have: Experience working with JavaScript and frontend frameworks like React.js or Vue.js . Familiarity with WebSockets for real-time communication features. Exposure to VoIP or real-time communication technologies such as WebRTC , SIP , and IP PBX . Key Traits We Value: Smart, logical, and curious problem-solvers. Hardworking individuals with a passion for learning and adapting to new challenges. What We Offer: Competitive salary A collaborative and innovative work environment. Opportunities to work on impactful and challenging projects as part of a growing team.

Position Overview: We are looking for a talented VoIP Engineer to join our dynamic team. The ideal candidate will possess solid expertise in VoIP technologies, including Kamailio, FreeSWITCH, SIP, and WebRTC, along with practical experience in networking, AWS cloud services, and Linux system administration. This role is perfect for someone who enjoys problem-solving, collaborative teamwork, and working in a fast-paced technology-driven environment. Key Responsibilities Design, deploy, and maintain VoIP infrastructure using Kamailio, FreeSWITCH and related tools. Configure and troubleshoot SIP and WebRTC protocols. Administer and optimize Linux-based servers for performance and reliability. Monitor network performance, manage network infrastructure, and troubleshoot networking issues. Deploy and manage infrastructure on AWS, leveraging relevant cloud technologies. Document infrastructure setup, configuration, and procedures. Collaborate closely with other teams (Backend, QA, Operations) to support the overall infrastructure strategy. Participate in on-call rotations and respond effectively to infrastructure incidents. Qualifications & Requirements Minimum 2+ years of experience with VoIP applications. Hands-on experience with Kamailio and FreeSWITCH. Solid understanding of SIP, RTP, WebRTC and Websockets. Proven Linux system administration experience (Ubuntu/Debian preferred) Familiarity with networking concepts (TCP/IP, TLS, VPN, IP Addressing, NAT Traversal) Practical experience with AWS services such as EC2, S3, VPC, and RDS. Understanding of Docker and scalable deployment strategies. Desired Soft Skills Strong analytical and problem-solving skills. Excellent communication and interpersonal skills. Self-motivated, proactive, and able to work effectively in a team. Organized with the ability to manage multiple priorities simultaneously. Adaptable, eager to learn new technologies, and committed to continuous improvement.

Job Summary We are looking for a Frontend developer with 1 to 3 years of experience to join our team. Requirements Experience building and shipping SPAs, SDKs, or mobile apps using JavaScript frameworks like React, Next.js, or Vue. Familiarity with routing and state management libraries such as React Router, Redux Toolkit, or libraries in the TanStack ecosystem. Hands-on experience with debugging and performance optimization using tools like React DevTools, along with build tools like Vite or Webpack, Git for version control, and npm/yarn for package management. Comfort with styling approaches like Tailwind CSS, CSS-in-JS, or traditional CSS/SCSS. Experience working with real-time communication protocols such as WebSockets, WebTransport, or gRPC. Solid understanding of RESTful APIs and how to consume them efficiently. Clear written and verbal communication skills, with the ability to collaborate effectively in a team setting. Good To Have Knowledge of TypeScript Experience with testing frameworks Experience with React Native Key Traits We Value Smart, logical, and curious problem-solvers Hardworking individuals with a passion for learning and adapting to new challenges

Job Title: Email Outreach & Copywriter Location: Remote | Type: Full-Time FreJun is seeking a highly motivated and data-driven Email Outreach Specialist with 4-6 years of experience to join our growing marketing team. We are seeking a seasoned specialist, a power user of modern sales engagement platforms such as Apollo.io or Clay.ai, who can design and execute sophisticated, highly personalised outreach campaigns that yield measurable results. The ideal candidate is a strategic thinker with a knack for creative and persuasive communication. You understand that effective outreach is a science and an art, and you have a proven track record of using advanced features within Apollo.io or Clay.ai to generate high-quality leads and opportunities. What You'll Be Doing: Campaign Strategy and Execution: Design, build, and manage end-to-end multi-touch outbound email and LinkedIn outreach campaigns. This includes developing messaging, creating sequences, and implementing A/B testing to optimise performance continuously. Expert-Level Prospecting: Utilise the full power of Apollo.io's advanced search filters and "pivot filters" to build hyper-targeted prospect lists that align with our ideal customer profile. For Clay.ai experts, this means leveraging waterfall enrichment and AI agents to uncover unique data points for deep personalisation. Hyper-Personalisation at Scale: Go beyond [First Name] personalisation. We're looking for someone who can use the rich data from Apollo.io or the AI-driven insights from Clay.ai to craft highly relevant and compelling outreach messages that resonate with individual prospects. This includes referencing recent company news, job postings, or technology usage. Automation and Workflow Mastery: Build and manage sophisticated automation workflows within your preferred platform. This includes setting up triggers, lead scoring models, and integrating with our CRM to ensure a seamless flow of data and timely follow-ups. Data Analysis and Reporting: Meticulously track and analyse key campaign metrics, including open rates, click-through rates, reply rates, and conversion rates. You will provide regular reports with actionable insights to the team and use this data to iterate and improve your outreach strategies. Deliverability and Compliance: Maintain a deep understanding of email deliverability best practices, including domain health, inbox warm-up, and compliance with regulations like CAN-SPAM and GDPR. What You'll Need to Succeed: Proven experience in a B2B email outreach, lead generation, or sales development role with a track record of meeting and exceeding targets. Deep, hands-on expertise with either Apollo.io or Clay.ai . You should be able to demonstrate your proficiency with the advanced features of at least one of these platforms. Exceptional written communication skills with a talent for crafting persuasive, concise, and human-sounding emails. A highly analytical and data-driven mindset. You are comfortable working with spreadsheets, analysing campaign data, and using insights to make informed decisions. Strong organisational and time-management skills. You can effectively manage multiple campaigns and priorities in a fast-paced environment. A self-starter with a proactive and resourceful approach to problem-solving. Bonus Points If You Have: Experience with other tools in the sales and marketing tech stack (e.g., Salesforce, HubSpot, LinkedIn Sales Navigator). Knowledge of copywriting principles and B2B buyer psychology. Experience in the B2B SaaS sector.

We’re Hiring: Technical Content Writer – AI Voice Infrastructure 📍 Location: 100% Remote (Your desk, your vibe, your playlist) 📅 Type: Full-Time 🧠 Who We’re Looking For We’re on the hunt for a full-time Technical Content Writer who can turn complex AI, LLM, and telephony concepts into compelling, easy-to-digest stories. You’ll be the person who can: Explain APIs and low-latency architecture so developers nod in approval and business leaders actually get it . Write like an engineer when precision matters, but tell a story like a tech journalist when it counts. Understand—or be excited to dive into—the voice AI space : streaming audio, conversational AI, TTS, and cloud telephony. Optimise for SEO without drowning content in keyword soup. Collaborate with product, marketing, and developer advocacy teams to take content from idea to publish. If you can make real-time voice infrastructure sound exciting to both geeks and decision-makers, we need to talk. 🚀 About FreJun Teler FreJun Teler powers global voice infrastructure for AI agents and LLMs. Our API lets developers integrate real-time, human-like voice conversations into their AI chatbots—across any cloud telephony or VoIP network—within minutes. We handle the complex voice transport layer so AI builders can focus on innovation, not call handling, streaming media, or telephony integration. 🔧 What You’ll Do Research and create blogs, developer guides, product docs, case studies, and thought leadership on AI voice tech. Build API walkthroughs, tutorials, and SDK integration guides developers actually enjoy reading. Translate technical features into clear, tangible benefits for audiences ranging from AI researchers to enterprise IT buyers. Keep content consistent across web, docs, email, and social—while tailoring tone for each. Work closely with engineers to ensure technical accuracy without losing readability . ✅ You’re a Great Fit If You… Pick up emerging tech fast—especially AI and APIs. Can explain “real-time media streaming for LLMs” without sending anyone into a nap. Understand developer tools and cloud services—or are ready to go deep. Write with clarity, confidence, and a touch of personality. Have a portfolio with technical blogs, explainers, or API docs. Meet deadlines without compromising quality. 🎁 What You’ll Get A front-row seat to the future of AI voice technology. The chance to build a standout content portfolio in a fast-growing niche. Direct collaboration with engineers, founders, and customers shaping AI’s future. Feedback and guidance to grow both as a writer and a tech communicator. ✨ Final Word We’re not just hiring a writer. We’re hiring a bridge between AI innovation and human understanding—a storyteller fluent in both code and plain English . If that’s you, welcome to FreJun Teler .