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