Senior Backend Developer (Node.js & Golang) - Bucharest

Senior Backend Developer (Node.js & Golang)
Bucureşti
Bucharest, Romania

We’re looking for a Senior Backend Developer with 5+ years of professional experience, including 3+ years of
- on Node. js expertise and strong knowledge of Golang, to help build and scale
- performance backend systems. You’ll work on complex technical challenges while collaborating closely with
- functional teams.

✅ Responsibilities

Backend Development & Architecture:

Design, develop, and maintain scalable backend services and APIs using Node. js and Golang, with a focus on performance, security, and reliability.
Architect REST/Graph
QL APIs with best practices for rate limiting, idempotency, and versioning.
Implement
- driven architectures using message brokers (Rabbit
MQ, Kafka) and
- time systems (Web
Sockets/Socket. io).
Optimize My
SQL/Postgre
SQL databases through query tuning, indexing, and sharding strategies.
Build and maintain caching layers with Redis (e. g. , cache invalidation, clustering, Lua scripting).

System Integration & Collaboration:

Integrate
- party APIs (payment gateways, authentication services) with fault tolerance and retry logic.
Collaborate with frontend and Dev
Ops teams to design
- native solutions (AWS/GCP/Azure) and containerized deployments (Docker/Kubernetes).
Write clean, maintainable code following SOLID principles and participate in rigorous code reviews.

Performance & Troubleshooting:

Identify and resolve bottlenecks in distributed systems, including database latency, message queue tuning, and API performance.
Implement monitoring and logging (Prometheus, Grafana, ELK Stack) for production systems.
Conduct root cause analysis (RCA) for critical issues and implement preventive measures.

Process & Best Practices:

Advocate for
- driven development (TDD) and write automated tests (Jest, Mocha, Cypress).
Contribute to CI/CD pipelines (Git
Hub Actions, Jenkins) and
-
- code (Terraform).
Document technical designs, API specs (Swagger/Open
API), and system architecture.

✅ Technical Requirements

Core Skills:

5+ years in backend development, with 3+ years of commercial Node. js experience.
Solid experience with Golang, especially in building scalable APIs and microservices.
Expertise in Node. js frameworks: Express. js, Nest
JS, Fastify.
Advanced proficiency in Java
Script/Type
Script (ES6+, async/await, streams).
Deep understanding of REST/Web
Socket APIs and microservices architecture.

Databases & Tools:

My
SQL/Postgre
SQL: Complex query optimization, replication, ORMs (Sequelize/Type
ORM).
Redis: Cache strategies, pub/sub, and persistence configurations.
Rabbit
MQ/Kafka: Message queuing, event streaming, and
- letter handling.

Dev
Ops & Cloud: