Senior Java Developer

27 - 34 USDNet per hour - B2B
Java

Senior Java Developer

Java
-, Warszawa

Link Group

Full-time
B2B
Senior
Hybrid
27 - 34 USD
Net per hour - B2B

Job description

We are looking for a Senior Java Developer to strengthen our back-end engineering team and play a key role in building and evolving high-scale, production-grade systems. You will contribute to architectural decisions, take ownership of complex features, and help ensure the stability, performance, and scalability of our platforms.

This role is ideal for an experienced engineer who enjoys working close to the code while having a real impact on system design and technical direction.


Your Responsibilities

  • Design, develop, and maintain back-end services and APIs using Java and Spring Boot

  • Take ownership of complex components and features throughout the entire development lifecycle

  • Actively contribute to system design discussions and architectural improvements

  • Optimize application performance, scalability, and reliability in distributed environments

  • Collaborate with cross-functional teams including Product, DevOps, QA, and Data

  • Ensure high code quality through reviews, testing, and adherence to engineering standards

  • Improve system observability through logging, metrics, and monitoring solutions

  • Support and guide less experienced developers through code reviews and knowledge sharing


What We’re Looking For

  • Bachelor’s degree in Computer Science or equivalent practical experience

  • Minimum 5 years of professional Java development experience (required)

  • Strong knowledge of Java, object-oriented design, and common design patterns

  • Proven experience with Spring Framework and Spring Boot

  • Hands-on experience building microservices and distributed systems

  • Solid understanding of concurrency, performance tuning, and scalability concepts

  • Experience working with Docker and Kubernetes-based environments

  • Familiarity with CI/CD pipelines and modern deployment workflows

  • Experience diagnosing and improving application performance using profiling or monitoring tools

  • Strong communication skills and the ability to work effectively across teams


Nice to Have

  • Experience with SQL and NoSQL databases (e.g. PostgreSQL, MongoDB, Couchbase)

  • Knowledge of reactive programming and frameworks such as Spring WebFlux

  • Experience with observability tools like Prometheus, Grafana, Kibana, or APM platforms

  • Exposure to high-traffic systems or data-intensive platforms

  • Familiarity with cloud environments and resource-efficient application design

Tech stack

    Microservices

    advanced

    Java

    advanced

    Spring

    advanced

    Spring Boot

    advanced

    CI/CD

    regular

    Docker

    regular

Office location

Published: 02.01.2026

Senior Java Developer

27 - 34 USDNet per hour - B2B
Summary of the offer

Senior Java Developer

-, Warszawa
Link Group
27 - 34 USDNet per hour - B2B
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Senior Java Developer - Link Group