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Senior Backend Developer (Node.js / NestJS / Express / Go)

OnHiresBucharesti, RO

18 hours ago

Job type

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Job description

Senior Backend Developer (Node.js / NestJS / Express / Go)

Location : Remote or Dubai (Hybrid optional)

Type : Full-Time | Industry : E-commerce, E-learning, Fintech, AI

We’re looking for a Senior Backend Developer to join our fast-growing engineering team and help scale our e-commerce and e-learning platforms , with opportunities to collaborate on AI-driven tools and fintech systems . This is a backend-heavy role focused on Node.js , with a preference for candidates who have experience with Go (Golang) or are eager to learn it. You’ll work across distributed systems , payment processing , authentication flows , and contribute to high-performance services.

What You’ll Be Doing

Backend Development & Architecture

Design and maintain highly scalable services using Node.js ( NestJS , Express.js ).
Build and extend REST and GraphQL APIs with clean, modular, and testable code.
Contribute to the architecture of new microservices written in Go , especially for critical system components.

E-commerce & Fintech Focus

Build and integrate secure payment gateway systems , including retry logic and reconciliation flows.

Implement authentication , authorization , token management , and data encryption across services.

Ensure system security, scalability, and reliability in handling sensitive financial and customer data.

Event-Driven Systems & Infrastructure

Leverage RabbitMQ and NATS for message-based communication and distributed workflows.

Work with Redis for caching, pub / sub, and queuing use cases.

Design and optimize PostgreSQL (RDS) schemas and queries for performance.

Collaboration & DevOps

Work closely with DevOps and Frontend teams on CI / CD pipelines , container orchestration ( Docker, Kubernetes, Helm ), and infrastructure as code ( Terraform ).

Participate in architectural reviews, technical documentation, and peer code reviews.

Growth & Cross-Platform Opportunities

Collaborate across our AI platforms , automated trading tools , and internal fintech systems.

Influence product direction, especially in integrating intelligent systems into our e-learning and e-commerce stacks.

Must-Have Experience

5+ years in backend development, with 3+ years of Node.js (Express.js, NestJS) experience.

Solid understanding of TypeScript , ES6+ , and asynchronous programming patterns.

Experience building secure REST and GraphQL APIs in production.

Hands-on knowledge of PostgreSQL , Redis , and message queues (RabbitMQ / NATS).

Strong grasp of payment systems , web security , JWT / OAuth2 , data encryption , and authentication flows .

Familiarity with Docker , Kubernetes , and CI / CD (GitLab or similar).

Nice to Have

Experience or working knowledge of Go (Golang) .

Exposure to Next.js , React , or full-stack applications.

Experience with AI-driven platforms , e-learning systems , or financial technology .

Knowledge of infrastructure-as-code , serverless architectures, or API observability.

Our Stack

Languages & Frameworks : Node.js (NestJS, Express.js), TypeScript, Go (Golang)

Frontend : React, NextJS

Data & Messaging : PostgreSQL (RDS), Redis, RabbitMQ, NATS

APIs : REST, GraphQL

DevOps : Docker, Kubernetes, Helm, GitLab, Terraform

Cloud : AWS / GCP

Why Join Us?

Build scalable platforms that power real-world e-commerce and e-learning solutions.

Work with cutting-edge AI and fintech products in cross-functional teams.

Gain ownership, solve complex challenges, and help shape architectural decisions.

Join a highly skilled, mission-driven engineering team working across modern stacks and ecosystems.

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Senior Backend Developer • Bucharesti, RO

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