Backend Developer (Node.js)

• Designing and implementing REST APIs and WebSocket interactions for internal and external banking systems.
• Participating in defining API contracts, data formats, and integration solutions.
• Working with relational (PostgreSQL) and NoSQL (MongoDB) databases: schema design, writing complex queries, and optimization.
• Implementing business logic using modern frameworks (NestJS / Express.js).
• Configuring and using message queues (Kafka / RabbitMQ) for asynchronous service communication.
• Participating in code reviews, refactoring, and improving code quality.
• Writing unit and integration tests, API testing.
• Containerizing applications and setting up environments using Docker and docker-compose.
• Monitoring, logging, and ensuring service reliability (metrics, health checks, error handling).

• Strong proficiency in Node.js (18+) and TypeScript, knowledge of ES6+ (async/await, destructuring, optional chaining, nullish coalescing).
• Understanding the Event Loop, experience working with Worker Threads and Streams.
• Experience with NestJS or Express.js (middleware, guards, interceptors, pipes).
• Experience in developing REST APIs and WebSocket services (Socket.io).
• Experience with PostgreSQL (complex queries, window functions, indexing) and MongoDB (aggregations, indexing, transactions, replication).
• Experience with ORMs (TypeORM / Prisma / Sequelize): migrations, relations, transactions.
• Experience with Redis (caching, pub/sub).
• Knowledge of authentication and authorization mechanisms (JWT, OAuth2, RBAC), understanding of security principles (CORS, CSRF, rate limiting).
• Experience with containerization (Docker, multi-stage builds, docker-compose) and message queues (Kafka / RabbitMQ).
• Experience in API documentation (Swagger / OpenAPI), writing tests (Jest / Mocha, Supertest, TestContainers), as well as setting up monitoring (Prometheus, Grafana) and logging.
• Level of English – from Intermediate and above.

• Experience working with GraphQL (Apollo / TypeGraphQL).
• Basic knowledge of Kubernetes (Deployments, Services).
• Experience with cloud platforms (AWS / GCP: Lambda, S3, SQS).

• Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc.
• The opportunity to change the project and/or develop expertise in an interesting business domain.
• Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant.
• Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee.
• The opportunity to earn up to an additional 1,000 USD per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities.
• Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated.
• Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies).
• Certification compensation (AWS, PMP, etc).
• Referral program.
• English courses.
• Private health insurance and compensation for sports activities.

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