Senior Backend Engineer – Node.js

Winzons; India; On-site; INR 1,800,000 - 3,000,000; Full time

Job summary

Cult.fit is hiring a Senior Backend Engineer to join India's largest fitness platform. You will own backend features powering group workouts, gym sessions, and member retention. Expect to design robust APIs, ensure high performance, and drive end-to-end delivery with ownership and teamwork across a fast-growing product.

Join a team building scalable services that touch millions of users across India, with a strong focus on code quality and maintainability in a dynamic fitness tech environment.

Qualifications

• 4+ years backend experience at a product-based company.
• Proficient in Node.js/TypeScript or Java/Spring Boot with deep ownership of one; familiar with the other is a plus.
• Solid REST API design including versioning, idempotency, error contracts, and auth.
• Comfortable with SQL and at least one NoSQL store (Redis, MongoDB).
• Ability to reason about latency, retries, and failure modes beyond happy paths.
• Curious about AI tools and how they can speed up delivery; understands where agents add leverage and where they break.

Responsibilities

• Build features that integrate with internal tools and customer-facing services, enhancing product value.
• Develop APIs and microservices powering group workouts, gym sessions, and member retention at scale.
• Tune performance to ensure high reliability and responsiveness of all systems.
• Explore AI-assisted workflows and agent-based tooling to boost team output.
• Own complete feature lifecycle from design through development, rollout, and iterations.

Skills

Node.js

TypeScript

Java

Spring Boot

REST API design

SQL

NoSQL

Redis

MongoDB

Performance tuning

AI tools curiosity

Job description

Company Name: Cult.fit Job Role: Senior Backend Engineer Work Type: Full-Time Experience: 4-6 Years Location: Bangalore Industry: Fitness Tech / Consumer Internet

About the Role

We're building India's largest fitness platform powering group workouts, gym sessions, and habit-building experiences for millions across India. The Member Experience team owns the features that keep members coming back, from live class infrastructure to retention loops like Cult Ninja.

What you'll Build

• Build features that integrate smoothly with internal tools and customer-facing services, while continuously enhancing product value.
• APIs and microservices powering group workouts, gym sessions, and member retention at scale.
• Perform performance tuning to ensure high reliability and responsiveness of all systems.
• AI-assisted workflows and agent-based tooling that multiply team output.
• Integrations across member data, scheduling, and engagement systems.

What we're looking for

The Fundamentals

• 4+ years of backend experience at a product-based company.
• Proficient in Node.js/TypeScript or Java/Spring Boot deep ownership of one, working familiarity with the other is a plus.
• Solid REST API design versioning, idempotency, error contracts, auth.
• Comfortable with SQL + one NoSQL store (Redis, MongoDB).
• Can reason about latency, retries, and failure modes not just happy paths.
• Curious about AI tools and how they can meaningfully speed up delivery understands where agents add real leverage and where they break.

Ownership Mindset

• Own the complete feature lifecycle from product and tech design through development, experimental rollout, and iterations.
• Proactively flags risks, doesn't wait to be asked.
• Writes code like someone else will maintain it during a 2 AM incident.

What to expect here

• Features you ship will touch millions of active members across India.
• Surround yourself with sharp, opinionated engineers who push each other.
• Real ownership your name goes on the feature, the metrics, and the learnings.
• A team that takes code quality seriously without being dogmatic.