Offer summary

Qualifications:

Minimum 4-5 years of professional experience in backend development., Strong knowledge of TypeScript and Node.js, especially with NestJS., Experience designing and documenting REST APIs and GraphQL., Solid understanding of databases like PostgreSQL, MySQL, or MongoDB..

Key responsibilities:

Participate in designing and implementing backend system integrations.

Identify issues during development and propose effective solutions.

Develop and maintain secure APIs with authentication and authorization.

Contribute to building scalable, microservices-based architectures.

Job description

Our partner is a Budapest‑based software development company, specializing in high-quality agile services that cover the full product lifecycle. The team of experienced engineers delivers mobile and web applications with a focus on efficiency, transparency, and customer‑centric solutions. We are looking for a new team member a Senior Backend Developer in a full remote position.

Your task will be to participate in the design and implementation of integrations with backend systems. Identify issues during development and proposing effective solutions.

Requirements

Core Backend Skills (required or strongly recommended with NestJS)

TypeScript – The primary language of NestJS; deep knowledge is essential
Node.js – NestJS is built on top of Node.js, so a solid understanding is required
REST API and/or GraphQL – Experience designing and documenting APIs (e.g., using Swagger)
SQL (e.g., PostgreSQL, MySQL) and/or NoSQL (e.g., MongoDB) – Strong database knowledge
ORMs – Experience with tools like TypeORM or Prisma, commonly used in NestJS projects

Backend Competencies

Authentication/Authorization – Experience with JWT, OAuth2, and Passport.js for secure access control.
Validation – Skilled in using class-validator and class-transformer in NestJS for robust input validation.
Error Handling & Exception Filters – Implements structured error responses and exception filtering in backend services.
Caching – Familiar with Redis, in-memory caching, and HTTP caching strategies to optimize performance.
Rate Limiting & Throttling – Applies techniques to protect APIs from abuse and ensure fair usage.
Logging & Monitoring – Utilizes tools like Winston, Prometheus, Grafana, and Sentry for observability, log management, and error tracking.

Cloud & DevOps Knowledge

Especially valuable in microservices or cloud-native environments)

Docker – Proficient in containerization and deploying NestJS applications in Docker environments.
CI/CD Pipelines – Experience with GitHub Actions, GitLab CI, and Jenkins for automating build and deployment workflows.
Cloud Platforms – Basic to intermediate knowledge of AWS, Google Cloud, and Azure, including core services like EC2, Lambda, S3, and RDS.
Kubernetes – Familiarity with container orchestration and deploying scalable applications (advanced level preferred).

Testing

Unit & Integration Testing – Writes unit and integration tests using Jest and the NestJS Testing Module.
End-to-End (E2E) Testing – Uses Supertest with NestJS to ensure full application flow works as expected.
Mocking & Dependency Injection – Applies mocking strategies and leverages dependency injection effectively for isolated testing.

Advanced Architectural Knowledge

Domain-Driven Design (DDD) – Understands how to model complex domains using DDD principles.
Microservices Architecture – Designs scalable systems using NestJS with message broker communication (e.g., RabbitMQ, Kafka).
Event-Driven Architectures – Builds loosely coupled systems based on event flows.
Clean Architecture & Separation of Concerns – Adheres to best practices for maintainable and testable codebases

Other skills:

Structured and critical thinking skills
Strong independent problem-solving ability but wiht the ability to collaborate effectively within a team
Minimum 4–5 years of professional experience
Intermediate English knowledge