Senior Node.js Developer (Fullstack) in Surnin Synergy LTD

Company: Surnin Synergy LTD

Location: Remote

Position: Senior Node.js Developer (Fullstack capable)

Employment Type: Contract / Full-time

About Surnin Synergy

Surnin Synergy is an AI R&D company. We build our own AI-powered products and provide AI development services for a wide range of clients.

Our team consists of 2 co-founders and 4 core team members. We are growing fast and looking for a Senior Developer who can take ownership of technical challenges, drive the development process end-to-end, and help shape both the architecture and implementation of our products.

Role Overview

We are looking for a Senior Node.js Developer with fullstack capabilities. The ideal candidate is pragmatic, autonomous, and ready to take full ownership of backend and frontend tasks — from database architecture to deployment. You will work closely with the founders and be a key contributor to product development, making important technical decisions and shaping the direction of our AI products.

Note: This role is on a contract basis. The project you will be working on is experimental and may not launch. We are looking for a developer who is excited by innovation and willing to contribute to projects that may evolve or pivot based on results.

Responsibilities

• Develop and maintain scalable backend systems using Node.js, Express, and TypeScript.
• Design system architecture, database schemas, and real-time features.
• Build and manage task queues and real-time communication using BullMQ, Redis, and WebSockets.
• Ensure application reliability, observability, and performance (OpenTelemetry + ELK).
• Implement robust testing, security, and documentation practices.
• Support frontend development (React, Vite, Shadcn UI) by reviewing code and implementing critical changes.
• Collaborate with the team to plan, deploy, and optimize infrastructure and features.

Requirements1. Core Backend & Architecture

• Expert-level Node.js and Express knowledge.
• Strong TypeScript skills (strict typing, Generics, Utility Types).
• Experience in System Design, architecture decisions, and pragmatic development.

2. Data, Async & Real-time

• Advanced MongoDB: aggregation, indexing, transactions, schema design.
• Advanced Redis usage: caching, pub/sub, data structures.
• Experience with BullMQ for reliable queues, idempotency, and rate-limiting.
• WebSockets: real-time implementation and scaling (Redis adapter).

3. Infrastructure & Observability

• OpenTelemetry + ELK for tracing, logging, and debugging distributed transactions.
• Docker: image optimization, docker-compose for development.
• Cost-aware infrastructure decisions (RAM/CPU/Storage optimization).

4. Quality Assurance & Security

• Unit and integration testing experience (Jest, Supertest), TDD is a plus.
• Knowledge of OWASP, secure APIs, token/session handling.
• Documentation skills: Swagger/OpenAPI, architectural documentation.

5. Frontend & Leadership

• Confident React, Vite, Shadcn UI knowledge.
• Ability to conduct thorough, constructive code reviews.
• Fully autonomous, able to handle tasks end-to-end from database to frontend and deployment.

What We Offer

• Opportunity to work in a fast-growing AI R&D company.
• Close collaboration with founders and key decision-making responsibilities.
• Flexible remote or hybrid work arrangements.
• Exposure to cutting-edge AI technologies and scalable product development.
• Chance to contribute to experimental AI projects with the potential to shape the future of our products.

How to Apply

Please send your CV and a brief cover letter.

Important: To prioritize your application, please answer these two questions in your cover letter:

1. Why are you the perfect fit for this specific role?
2. Name 3 technical improvements or optimizations you would make to our AI products or backend systems.

If you’re ready to drive impact on our AI products, we encourage you to apply!