Software Engineer - VoIP Applications

GxP Technologies India Pvt. Ltd.; Thiruvananthapuram; On-site; INR 1,200,000 - 1,800,000; Full time

Benefits offered by this job

Mentorship by senior leadership

Clear career path to team lead

Job summary

GxP Technologies India Pvt. Ltd. in Kerala is seeking a Node.js Backend Developer with expertise in TypeScript, REST APIs, and real-time communications. You will build scalable services, integrate VoIP platforms like Asterisk and Twilio, and implement real-time streaming with WebSocket technologies.

The role emphasizes asynchronous processing, data storage with Redis and MariaDB, and an extensible Next.js-based monitoring dashboard. Strong backend focus with cloud-ready deployments is expected.

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field.
• 3–5 years of hands-on frontend development experience.
• Certifications in related fields are a plus.

Responsibilities

• Design, develop, and maintain scalable backend services using Node.js 20 LTS and TypeScript.
• Build robust REST APIs using NestJS or Fastify.
• Integrate Asterisk PBX systems via ARI and node ari-client.
• Develop and maintain Twilio integrations for communication platforms.
• Implement real-time event processing with ARI events and webhooks.

Skills

Node.js

TypeScript

REST API

Asterisk ARI

Twilio API

Redis

MariaDB

Async processing

WebSocket

Next.js

Education

Bachelor's/Master's in CS/Engineering

Tools

NestJS

Fastify

ari-client

Prisma/TypeORM

Docker

CI/CD

uWebSockets.js

Job description

Job Description:

About GxP Technologies India

We are a deep tech technology firm specializing in AI-driven solutions across healthcare, industrial manufacturing (including semiconductors), and automotive sectors—offering a complete AI stack from edge devices to cloud-based software. As part of Growth xPartners, a Japanese company listed on the Tokyo Stock Exchange, we operate from Trivandrum and boast a diverse, global team rooted in a values-driven performance culture. Our cross-functional team drives innovation in an early-stage, fast-growing environment with a clear long-term vision to become the industry leader in every domain we serve.

Job Summary

We are looking for a skilled Node.js Backend Developer with experience in building scalable, real-time backend applications and integrating communication platforms. The ideal candidate will have strong expertise in Node.js, TypeScript, REST APIs, asynchronous processing, and real-time communication technologies.

You will be responsible for developing and maintaining backend services, integrating VoIP platforms such as Asterisk and Twilio, and building real-time streaming capabilities and monitoring dashboards.

Requirements

Mandatory Skills

• Core: Node.js 20 LTS, TypeScript
• REST API: NestJS (or Fastify)
• Asterisk Integration: Community ari-client (Node)
• Twillio API/applications/similarexperience/exposure
• Data Layer: Redis (ioredis), MariaDB (Prisma/TypeORM)
• Asynchronous Processing: Experience in Natively (via the event loop) handles ARI/events/webhooks in a unified manner
• WebSocket/Media Processing: ws / uWebSockets.js: supports for real-time streaming
• Experience in building naturally extensibleoperations/monitoring dashboard built with Next.js

Secondary/Good to have skill

• Experience developing VoIP, telephony, contact center, or communication-based applications.
• Hands-on experience with Asterisk PBX, ARI, call control, and call lifecycle management.
• Experience with Twilio Programmable Voice or similar communication APIs.
• Familiarity with audio streaming, media processing, and real-time event handling.
• Experience building monitoring dashboards using Next.js.
• Knowledge of Docker, CI/CD pipelines, and cloud-based deployments.
• Experience with application logging, metrics, alerting, and production troubleshooting.

Key Responsibilities

• Design, develop, and maintain scalable backend services using Node.js 20 LTS and TypeScript.
• Build robust REST APIs using NestJS or Fastify.
• Integrate Asterisk PBX systems using the Asterisk REST Interface (ARI) and the Node.js ari-client library.
• Develop and maintain integrations with Twilio APIs, applications, or similar communication platforms.
• Implement real-time event processing for ARI events, webhooks, and other asynchronous operations using Node.js event-driven architecture.
• Design and manage data storage and caching solutions using Redis and MariaDB.
• Implement database access and ORM-based data management using Prisma or TypeORM.
• Develop WebSocket-based communication and real-time streaming capabilities using ws or uWebSockets.js.
• Build an extensible operations and monitoring dashboard using Next.js to support real-time system visibility, monitoring, and operational management.
• Ensure application performance, reliability, scalability, and maintainability.
• Troubleshoot technical issues, optimize backend performance, and collaborate with cross-functional teams to deliver reliable solutions.

Qualification and Work Experience

Qualifications - Must Have

Bachelor’s/Master’s degree in Computer Science, Engineering, or related field.

Certifications- Desired

Relevant certifications in related fields will be considered an added advantage.

Work Experience

3–5 years of hands-on front-end development experience.

Strong problem-solving skills, Analytical skills with attention to detail and a growth mindset.

Competencies and Skills

• Communication Skills: Strong interpersonal, verbal, and written communication abilities, with the capability to collaborate effectively with cross-functional teams and articulate technical concepts clearly.
• Tech Savviness: Comfortable working with modern development tools, technologies, and software engineering systems.
• Proactive & Ownership Attitude: A self-driven individual who takes full ownership of tasks, proactively identifies problems, and contributes to scalable, high-quality solutions.
• Adaptability: Ability to thrive in a dynamic, fast-paced engineering environment, quickly learn new technologies, and adapt to evolving project requirements.

Benefits

• A competitive salary and benefits package.
• High visibility and direct mentorship, reporting directly to senior leadership.
• A clear career path from a foundational individual contributor to a team leader.
• The opportunity to take ownership of key marketing functions and make a real impact.
• Direct exposure to international business strategy and operations.
• A collaborative, supportive, and dynamic work culture.

Requirements: