Backend Developer (Mid-Level / Senior) — Fitness SaaS Platform

Gracemark SolutionsUnited States only

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Job description

Locations: India, Turkey, Azerbaijan - REMOTE

We are a fast-growing startup building a gym management and fitness tracking SaaS platform. We are looking for an experienced Backend Developer to scale our existing infrastructure and ship new features.

*About the Role**

You will take ownership of our backend architecture, work closely with the frontend team on API integration, and help migrate legacy C#/.NET code to a modern Node.js stack. This is a long-term engagement with room to grow as the platform scales.

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Backend Developer (Mid-Level / Senior) — Fitness SaaS Platform at Gracemark Solutions · ApplyPick

*Core Responsibilities**
Design and build scalable backend architecture using NestJS and TypeScript
Database design and optimization with PostgreSQL + TypeORM / Prisma
Implement RESTful APIs, JWT authentication, CQRS, and Clean Architecture principles
Integrate Firebase Auth and push notifications
Set up and manage MinIO / AWS S3 file storage
Containerization and deployment management using Docker
Collaborate with frontend team on API integration
Migrate legacy C#/.NET codebase to Node.js
Write unit and integration tests; participate in code reviews
*Tech Stack**
**Backend:** Node.js, NestJS, TypeScript, TypeORM / Prisma
**Database:** PostgreSQL, Redis
**DevOps:** Docker, Docker Compose, CI/CD (GitHub Actions / GitLab CI)
**Cloud:** Firebase, MinIO / AWS S3
**Testing:** Jest, Supertest
**Version Control:** Git, GitHub / GitLab
*Requirements**
3+ years of backend development experience
Strong proficiency in NestJS and TypeScript
Solid understanding of RESTful API design and Clean Architecture
Experience with PostgreSQL and ORM tools (TypeORM or Prisma)
Familiarity with Docker and containerized deployments
Fluent written and spoken English (for technical documentation and async communication)
*Nice to Have**
Ability to read and understand C#/.NET code
Experience with DDD, Microservices, GraphQL, or Event-driven architecture
Redis caching experience i18n / multi-language system implementation
Legacy codebase refactoring experience
*What We Offer**
Long-term collaboration with a growing startup
Work with modern technologies and best engineering practices
Dynamic and innovative technical team
Performance-based salary growth
Future equity potential
*Work Type:** Remote (Anywhere)
*Engagement:** Full-time / Part-time / Freelance
*Rate:** Negotiable based on experience and portfolio
*To Apply, Please Answer:**
Share your experience with NestJS and TypeScript — what's the largest system you've built?
Have you worked on a C#/.NET to Node.js migration before? If yes, describe the approach.
Attach your GitHub profile or relevant portfolio links.
Applications without answers will not be reviewed.
Originally posted on Himalayas