SDE III - Whatsapp Voice

HighLevel; India; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

HighLevel in India is looking for a Lead Engineer with expertise in Node.js and MongoDB. In this role, you'll enhance platform stability and scalability while addressing complex challenges across frontend and backend systems. The ideal candidate has over 4 years of software engineering experience and a strong background in distributed systems and performance optimization. You will drive technical excellence and support a culture of accountability, collaborating with diverse teams to deliver exceptional user experiences.

Qualifications

• 4+ years of hands-on software engineering experience building and scaling robust backend systems.
• Strong backend engineering skills with hands-on experience in API development and systems architecture.
• Familiarity with modern frontend frameworks and CSS libraries.

Responsibilities

• Own and contribute to architecture and development across products.
• Develop and optimize backend API services with test-driven development.
• Ensure top-tier application security and compliance across frontend and backend.

Skills

Node.js

MongoDB

API development

Distributed systems

Frontend frameworks

Caching strategies

Security best practices

Tools

TypeScript

PostgreSQL

Redis

React

Vue

Bootstrap

Job description

About us HighLevel is an AI-powered business operating system that gives agencies, entrepreneurs and SMBs the infrastructure to build, automate and scale. Today, HighLevel supports SMBs across 150+ countries, fueling community-driven growth rooted in real customer outcomes. To date, businesses operating on HighLevel have generated over $7 billion in ecosystem value, demonstrating the impact of shared infrastructure at scale. By centralizing conversations, automation and intelligence into one system, we help businesses move faster, reduce complexity and execute efficiently. Behind the platform, HighLevel powers more than 4 billion API hits and 2.5 billion message events daily. With 250 terabytes of distributed data, 250+ microservices and over 1 million domain names supported, our architecture is built for performance, resilience and long-term scalability.

Our people With over 2,000 team members across 10+ countries, HighLevel operates as a global, remote-first organization built for speed and ownership. We value initiative, clarity and execution, creating space for ambitious people to build systems that support millions of businesses worldwide. Here, innovation thrives, ideas are celebrated and people come first, no matter where they call home.

Our impact Every month, HighLevel enables more than 1.5 billion messages, 200 million leads and 20 million conversations for the more than 1 million businesses we support. Behind those numbers are real people building independence, expanding opportunity and creating measurable impact. We’re proud to be a part of that.

About the Role

As a Lead Engineer, with deep expertise in Node.js, MongoDB, and distributed systems, along with a strong focus on platform stability, scalability, and long-term technical excellence. You’ll join our LC Phone Voice System, which provides capability for voice calling, IVR, SIP and much more.

You’ll be contributing in shaping the experience of our platform. You’ll solve complex challenges across frontend / backend architecture, performance, micro-frontends, and distributed backend systems. You’ll also work on resolving critical voice service issues, such as the carrier-level call blocking and SIP 603 errors reported by clients like Forever Freight Broker. You’ll contribute to overall growth and stability of the platform, collaborate closely with PMs and ensure exceptional user experiences at scale.

• Own and contribute to architecture and development across products, driving technical excellence in both frontend and backend systems.
• Develop and optimize backend API services with test‑driven development including advanced caching and messaging for reliability and scalability.
• Deliver high‑quality frontend experiences using modern frameworks, with strong fundamentals in component‑based architectures and state management.
• Integrate and support observability, logging, and monitoring to ensure platform reliability and rapid incident response.
• Ensure top‑tier application security and compliance, applying best practices across frontend, backend, and API layers (authentication, authorization, rate‑limiting, OWASP).
• Leverage LLMs and AI tools to write, refactor, test, and debug code efficiently, implementing guardrails for reliability.
• Participate in design reviews, deep dives, and on‑call rotations to support a culture of accountability and operational excellence.

• 4+ years of hands‑on software engineering experience building and scaling robust backend systems and high‑performance frontend applications.
• Strong backend engineering and distributed system design skills, with hands‑on experience in API development, data modeling, and systems architecture using Node.js (NestJS preferred), TypeScript, PostgreSQL, MongoDB, and Redis.
• Expertise in backend performance optimization, caching strategies, and event‑driven architectures (e.g., Redis, Kafka, Pub/Sub).
• Familiar with modern frontend frameworks (React, Vue, Angular), advanced UI engineering patterns, and CSS libraries like Bootstrap or Tailwind CSS.
• Advanced experience with complex state management libraries (e.g., Redux, Vuex, MobX) and architectural design of large‑scale application state.
• Proven track record of optimizing frontend performance and web vitals at scale, including experience with server‑side rendering (SSR), edge, or hybrid rendering architectures.
• Familiarity with frontend and backend observability - including monitoring, tracing, error tracking, and performance profiling in production (e.g., Grafana, Prometheus, Sentry, PostHog).
• Strong understanding of security best practices across the full stack—including authentication, authorization, access control, secure data flow, and privacy compliance.
• Excellent communication and cross‑functional collaboration skills, able to drive complex initiatives, lead technical discussions, and mentor junior engineers.

EEO Statement

The company is an Equal Opportunity Employer. As an employer subject to affirmative action regulations, we invite you to voluntarily provide the following demographic information. This information is used solely for compliance with government record keeping, reporting, and other legal requirements. Providing this information is voluntary and refusal to do so will not affect your application status. This data will be kept separate from your application and will not be used in the hiring decision.