Senior Backend Developer (Java/Node.js)

We are a growing international team based in Astana, working closely with partners and clients across the European Union. Unlike classic outsourcing or consulting setups, our engineers are an integral part of the product teams, collaborating daily with colleagues in Europe to build and evolve long-term platforms.

One of our clients, 21Viral, is a technology company in the iGaming sector, founded in 2011 and specialising in gaming content aggregation.

What you'll be working on:
- Building and maintaining microservices for integration platform
- Implementing reactive, non-blocking APIs using Spring WebFlux and NestJS
- Integrating with third-party service providers
- Developing secure, high-performance transaction processing systems
- Working with distributed systems and cloud infrastructure
- Optimizing database queries and implementing efficient caching strategies
- Participating in code reviews and architectural decisions.

Technical skills and experience:
- 4+ years of professional experience in Java (Spring Boot) and/or Node.js development
- Strong experience with reactive and non-blocking programming using Spring WebFlux (Project Reactor) and/or asynchronous Node.js/NestJS
- Hands-on experience with PostgreSQL (queries optimization, indexing, transactions)
- Solid understanding and practical experience with microservice architecture
- Experience in building and maintaining distributed systems
- Experience with asynchronous communication and message brokers (AWS SQS, RabbitMQ, Kafka, or similar)
- Experience with Redis for caching and session management.

Personal qualities:
- Proactive and self-driven, with the ability to work independently
- Strong problem-solving and analytical thinking skills
- Excellent communication skills and a collaborative mindset
- Solid English skills.

Good to have:
- Experience with TypeScript in Node.js projects
- Experience in implementing complex transaction processing and financial systems
- Experience with Docker and AWS cloud services (ECS, RDS, ElastiCache, S3)
- DevOps experience (CI/CD, Infrastructure as Code with Terraform/CloudFormation)
- Experience with Terraform for infrastructure management
- Experience with ReactJS or similar frontend frameworks
- Knowledge of security best practices (authentication, encryption, secure APIs)
- Experience with R2DBC (reactive database connectivity).

Tech stack:

Backend:
- Java 21 with Spring Boot 3.5+ and Spring WebFlux (reactive programming)
- Node.js with NestJS framework and TypeScript
- PostgreSQL 15 with R2DBC (reactive database access)
- Redis 6.x for caching and session management
Infrastructure:
- AWS (ECS Fargate, RDS, ElastiCache, ALB, S3, SQS, CloudWatch)
- Docker for containerization
- Terraform for Infrastructure as Code
- NGINX for reverse proxy
Architecture:
- Microservices architecture (20+ services)
- Reactive, non-blocking, event-driven patterns
- RESTful APIs
- Message-driven architecture with AWS SQS
Development Tools:
- Git (GitHub)
- Maven / npm
- GitHub Actions (CI/CD)
- AWS CLI

Важно: Рассматриваем кандидатов только через официальное трудоустройство через ТОО по ТК РК, без ГПХ или ИП. Гибридная работа по договоренности с командой. Просим вас указать зарплатные ожидания в сопроводительном письме.

Спасибо, и хорошего дня.