

Monjura Parveen
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Job Title: Golang Developer
Location: Kolkata
Job Type: Full-time
Working Days: 5 Days (Rotational off)
About the Role:
We are seeking a skilled Golang Developer with experience in Golang, Node.js, WebSocket
communication, and API development. In this role, you will work closely with our development
team to design, develop, and maintain high-performance backend systems and real-time
applications.
Key Responsibilities:
Design, build, and maintain efficient, reusable, and reliable Golang code.
Develop scalable APIs and microservices.
Integrate and build real-time communication using WebSocket protocols.
Collaborate with frontend developers and other team members to establish objectives
and design more functional, cohesive systems.
Write clean, maintainable, and well-documented code.
Optimize applications for maximum performance, scalability, and security.
Participate in code reviews, contribute to team knowledge, and continuously improve
development processes.
Troubleshoot, debug, and upgrade existing systems.
Occasionally work with Node.js services and modules when needed.
Required Skills and Qualifications:
Min 3+ years of experience in backend development with Golang.
Solid understanding of Node.js and JavaScript/TypeScript.
Hands-on experience with WebSocket integration and real-time applications.
Strong knowledge of RESTful APIs, API design principles, and API documentation. Experience with relational and NoSQL databases (e.g., MySQL, PostgreSQL, MongoDB).
Good understanding of concurrent programming and microservices architecture.
Familiarity with cloud platforms (AWS, GCP, Azure) is a plus.
Knowledge of containerization tools like Docker and Kubernetes is a plus.
Strong problem-solving skills, attention to detail, and a proactive attitude.
Job Opening: FreeSWITCH Developer
Location: Ecospace Business Park, Rajarhat, Newtown, Kolkata
Employment Type: Full-Time, Permanent
Shift: Day Shift
Experience: Minimum 4+ years in FreeSWITCH/VoIP Development
Responsibilities:
- Design, develop, deploy, troubleshoot, and maintain tools and services supporting our cloud telephony network.
- Customize FreeSWITCH for large-scale audio/video conferencing (1000–1500 concurrent calls).
- Expertise in SIP, RTP, RTCP, TURN, STUN, NAT, TLS.
- Hands-on experience with RTP Proxy and routed audio conferences.
- Understanding of SDP Protocol offer/answer mechanism.
- Work with load testing tools for FreeSWITCH audio conferences.
- Deploy and manage multiple FreeSWITCH instances using load balancers.
- Debug issues using packet captures (Wireshark/Ngrep).
- Collaborate with mobile/API teams for integration and support.
- Knowledge of codecs (PCMU, PCMA, G729, Opus) and open-source telephony technologies (FreeSWITCH, WebRTC).
- Familiarity with SIP servers (SER/OpenSER), proxy servers, SBC, SIPX is a plus.
Qualifications:
- Bachelor’s degree in Engineering (B.Tech/MCA).
- 4+ years of hands-on experience in FreeSWITCH development or related VoIP technologies.
- Strong knowledge of Linux environments and command-line tools.
- Basic to intermediate SQL knowledge.
- Proficiency in scripting (Bash, Python, Perl) for automation.
- Strong understanding of VoIP protocols (SIP, RTP), networking principles (TCP/IP, DNS, DHCP, routing protocols).
- Excellent troubleshooting skills with ability to resolve complex technical issues.
- Strong problem-solving, communication, and collaboration skills.
Industry Preference:
- Travel (Preferred)
- Any Industry (Required)

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