
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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About the job
As a Senior SIP Engineer, you must take complete ownership of supporting all VoIP infrastructure, debugging issues related to specific servers or software, or remote clients such as SIP devices (both virtual such as soft-phone or WebRTC client, and physical such as a desk phone or an on-premise PBX), and providing fixes.
- Support customers during EST timezone during critical releases or emergency incidents 5+ yrs of supporting global VoIP services and/or applications on cloud-based servers.
- Expertise in SIP call flow analysis and debugging Expertise in setup and maintaining SIP-based monitoring, debugging, and alerting services
- Experience scripting call flow, dialplan, and custom routing with FreeSwitch using LUA and XML
- Experience in debugging Kamailio and Freeswitch-based applications is a must Good problem-solving and analytical skills Excellent written and verbal communication
- Experience working with open-source projects
- Exposure to SIP Carrier Integration
- Advanced Experience with cloud media infrastructure (load balancers, gateways, SBCs, STUN, TURN)
- Advanced Knowledge of all modern VoIP protocols/platforms including (SIP, RTP stack & SDP, RTCP, TCP, UDP, SIP, HTTPS, SSL/TLS)


You will be building using C/C++ and related technologies on mainly Windows platforms.
● Manage priorities, deadlines, and deliverables with your technical expertise
● Research solutions and decide the best and practical solution for complex problems
● Lead designs of major product components, and features
● Design, develop, test, maintain and enhance the product
● Analyze issues reported by customers
● Mentor and train team members on design techniques and technologies
Desired Keyskills -
Relevant experience of 4-7 years in C/C++ development on any platform (Linux, Windows, macOS)
● Experience and skills in designing components and modules
● Experience in the mentoring team for technical skills
● Experience in guiding team for technical needs
● Working proficiency and communication skills in verbal and written English
● Experience in XML, STL, Win32 SDK, Dynamic Library / Shared Library, Process, Multithreading, Windows Messages, ATL, COM, HTTP, File I/O, Memory Mapping, API Hooking, and Memory
Management on Windows or Linux platform
● Experience in Windows System Programming
● Experience in debugging and troubleshooting with using tools like Sysinternals Tools, Debuggers / windbg, API Monitoring / Tracing
● Experience in MS Office & Outlook Object Model
● Experience in Cryptography, Data Security, Information Security and Security Technologies
● Experience in Cross-Platform development
● Experience in building of Desktop software


Duration: 6 months with possible extension
Location: Remote
Notice Period: Immediate Joiner Preferred
Experience: 4-6 Years
Requirements:
- B Tech/M Tech in Computer Science or equivalent from a reputed college with a minimum of 4 – 6 years of experience in a Product Development Company
- Sound knowledge and application of algorithms and data structures with space and me complexities
- Strong design skills involving data modeling and low-level class design
- Good knowledge of object-oriented programming and design patterns
- Proficiency in Python, Java, and Golang
- Follow industry coding standards and be responsible for writing maintainable/scalable/efficient code to solve business problems
- Hands-on experience of working with Databases and the Linux/Unix platform
- Follow SDLC in an agile environment and collaborate with multiple cross-functional teams to drive deliveries
- Strong technical aptitude and good knowledge of CS fundamentals
What will you get to do here?
- Coming up with best practices to help the team achieve their technical tasks and continually thrive in improving the technology of the product/team.
- Driving the adoption of best practices & regular Participation in code reviews, design reviews, and architecture discussions.
- Experiment with new & relevant technologies and tools, and drive adoption while measuring yourself on the impact you can create.
- Implementation of long-term technology vision for your team.
- Creating architectures & designs for new solutions around existing/new areas
- Decide on technology & tool choices for your team & be responsible for them.

At Egnyte we develop content governance and collaboration products that are deployed across several large companies such as Yamaha and Red bull. The Egnyte platform supports daily, business critical operations for a million-plus user base interacting with a multi-petabyte content set.
We store, analyze, organize, and secure billions of files and petabytes of data with millions of users. We observe more than 1M API requests per minute on average. To make that possible and to provide the best possible experience, we rely on great engineers. For us, people who own their work from start to finish are integral. Our Engineers are part of the process from design to code, to test, to deployment, and back again for further iterations.
We’re looking for Senior Software Engineers and he should be able to take a complex problem and work with product managers, devops and other team members to execute end to end.
- Design and develop scalable cloud components that seamlessly integrates with on-premises systems.
- Challenge and redefine existing architecture or make 10x improvements in performance and scalability.
- Ability to foresee post-deployment design challenges, performance and scale bottlenecks.
- Hire and mentor junior engineers
- Doing code reviews, unit and performance testing of the code.
- Monitor and manage 3000+ nodes using modern DevOps tools and APM solutions.
- Demonstrated success designing and developing complex cloud based solutions
- Solid CS fundamentals with one or more areas of deep knowledge
- Experience with the following technologies: Java, SQL, Linux, Python, Nginx, Haproxy, BigQuery, HBase, New Relic, memcache, Elasticsearch, docker.
- Data driven decision process
- Relies on automation testing instead of manual QA
- Experience in working with Google cloud, AWS or Azure is preferred
We would prefer the candidate work from our Mumbai office for alteast first 6 months.
Kapture CRM is an enterprise-focused Service automation SaaS platform. We help 500+ enterprises in 14 countries to manage their customer service in a more intelligent, contextual way.
Roles & Responsibilities :
* Proven experience in Java8, Spring Boot, Microservices/API
* Strong experience with Kafka, Kubernetes
* Strong experience in using RDBMS (Mysql) and NoSQL.
* Experience in working in Eclipse / Maven environments.
* Hands-on experience in Unix / Shell scripting.
* Hands-on experience in fine-tuning application response/performance testing.
* Experience in Web Services.
* Strong analysis & problem-solving skills
* Strong communication skills - both verbal and written
* Ability to work independently with limited supervision
* Proven ability to use own initiative to resolve issues
* Full ownership of projects/tasks
* Ability and willingness to work under pressure, on multiple concurrent tasks, and to deliver to agreed deadlines
* Eagerness to learn
* Strong team-working skills

Nest is a gamified investment platform for the next-generation and young millennials of the world, to invest, play and earn returns more than a regular savings bank account. The world of gaming is merging with finance to offer a more immersive user experience and help users learn how to manage their money. We’re creating a new breed of asset managers and fin-fluencers with Nest.
We are seeking a dedicated Golang developer to join our growing company.
You will collaborate with other technical staff to deliver and maintain a fully-functional mobile application. We hope you can put your passion for software engineering to work for creating highly immersive user applications.
Your duties will include maintaining code repositories via GitHub and internal server storage modules.
Responsibilities
Below are some of the responsibilities a Golang developer is expected to undertake in their position:
- Implement AWS containers to support Go implementation and successful repository maintenance
- Utilize Kubernetes to ensure successful application development, deployment, and scaling
- Implement Docker for smaller-scale applications that require simpler deployments
- Employ Linux Terminal command structures to allow easy back-end operations for less-expert technical staff
- Structure our user interface with React and ensure REST API access is available for enterprise-grade finance customers on-demand
- Collaborate with other technical staff to ensure consistent and smooth DevOps workflows
- Choose and implement other JavaScript libraries that will optimize performance without sacrificing security and base functionality
- Manage multiple projects within reasonable design specifications and budget restrictions
- QA design for errors
- Implement feedback and changes whenever possible
- Create visualizations that convey accurate messaging for the project.
Job Qualifications and Skill Sets
Bachelor’s degree in computer science, IT, or a related field, such as programming. Other critical skills required are:
- Provable proficiency in Go programming
- Excellent written and verbal communication skills
- Minimum of two years’ experience working in programming or information technology
- Attention to detail and Knowledge in Java is recommended
- Portfolio of work with examples that showcase technical skill
- Strong analytical skills
- Time management and organizational skills
- Knowledge of Go templating, common frameworks, and tools
- Experience working with a team
What you’ll receive
- A compensation competitive to premier firms
- Incredible learning and exposure to every aspect of a funded financial startup as an early member, working directly with the founders.
- Recognition and experience of working on a platform with an exponential user growth curve.
- A fun and receptive work culture which promises to never get mundane!
- If you love party, it is on us!

DeepSource is working on building tools that help developers ship good code. There are over 40 million developers in the world, and all of them write and review code in some form. There’s a massive opportunity to impact how software is built right from where the code is written using automation and intelligence, that not only improves developer productivity but also increases software’s robustness.
The Language Engineering team works on the source code analyzers, including both programming languages and configuration-as-code systems. As a member of the Language Engineering team, you will work on building the best, most comprehensive, Python analyzer in the world. You will add new rules and Autofixes for finding more issues with code and automatically fixing them. You will be involved with the Python community to understand the problems with static analysis tools in the ecosystem.
As a member of the Language Engineering team, you will:
-
Identify bad code practices in Python and write new analyzers to detect them.
-
Improve the coverage of automatically fixable issues.
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Ensure fewer false positives are reported by the analyzer.
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Work on the internal tools that support analysis runtimes.
-
Contribute to open-source static analysis tools.
We’re looking for someone who has:
-
Strong foundational knowledge in Computer Science.
-
At least 2 years of professional software development experience in Python.
-
Understanding of the nuances of execution of the source code (AST, data flow graphs, etc).
-
Familiarity with Python best practices followed in the industry.
-
Native experience with Linux/Unix environment.
-
A focus on delivering high-quality code through strong testing practices.
We offer competitive compensation with meaningful stock options, a generous vacation policy, and a workstation of your choice, to name a few of the perks.

Programming Languages: Perl, Python, java. Perl programming with strong OOPs knowledge.
- UI: HTML, JS
- System: Linux must have – good knowledge and shell scripting experience.
- Prior experience in infrastructure automation, monitoring will definitely help.
Description:
The person in this role:
- Will be involved in developing new monitoring scripts, enhancement & defect fixes on existing monitors
- Have to be on-call to support any incoming production/P1 internal issues which need urgent attention (team members are on call for a week and we have a weekly rotation policy within the team)
Preferred skills:
Perl
- Shell scripting
- Unix
- Jenkins

Skills required:
- knowledge of Linux administration and Bash,
- great overall coding experience, knowledge of algorithms, etc,
- experience with Git,
- experience with Docker.
Typical tasks would consist of writing scripts for:
- server automation,
- container deployment,
- user data migration,
- backup management.


