Senior Java Engineer — Modernization, Reliability & Security

Luxoft; Warszawa; On-site; PLN 240,000 - 340,000; Full time

Job summary

Luxoft is seeking an Expert Java Engineer to lead hands-on engagements aimed at securing, modernizing, and stabilizing banking applications. You will own the work from assessment through deployment, collaborating with development teams to resolve vulnerabilities, update tech stacks, and improve CI/CD pipelines.

The role combines software engineering, DevOps, SRE, test automation, and application security, with roughly 70% hands-on coding and debugging.

Qualifications

• Extensive hands-on experience with production Java applications.
• Expert-level Java, JVM, and Spring knowledge.
• Recent experience writing, debugging, and reviewing production code.
• Strong experience with automated testing and Test-Driven Development.
• Experience with CI/CD, release automation, and production deployments.
• Strong understanding of secure coding and vulnerability remediation.
• Experience upgrading runtimes, frameworks, and libraries.
• Experience with containerization (Docker) and Linux environments.
• Strong Git and production-debugging skills.
• Understanding of observability, resilience and distributed systems.
• Proven ownership and ability to lead complex end-to-end work.
• Excellent communication with engineering teams and stakeholders.

Responsibilities

• Lead hands-on engagements focused on modernization, security, testing, reliability and release automation.
• Assess code, dependencies, runtimes, tests, CI/CD, deployment architecture, and risks.
• Write, debug, review, and improve production-grade Java applications and configurations.
• Define and implement remediation and modernization plans.
• Improve automated testing including unit, integration, regression, contract, and deployment tests.
• Perform vulnerability triage and secure remediation across dependencies.
• Upgrade Java/JVM, Spring, Node.js, libraries, and container images.
• Modernize legacy Java apps and middleware (WebSphere, WebLogic).
• Improve CI/CD pipelines, release automation, rollback procedures, and production validation.
• Containerize applications and support OpenShift or Kubernetes deployments.
• Introduce observability and resilience practices (logging, metrics, tracing, health checks, alerts).
• Lead technical discussions, code reviews, workshops, and knowledge transfer with client teams.

Skills

Java

JVM

Spring ecosystem

Test-Driven Development

CI/CD

secure coding

dependency management

Docker

Git

Distributed systems

ownership

communication with stakeholders

Tools

Docker

Linux

OpenShift/Kubernetes

Git

CI/CD tools

Job description

Luxoft is seeking an Expert Java Engineer to lead hands-on engagements aimed at securing, modernizing, and stabilizing banking applications. You will own the work from assessment through deployment, collaborating with development teams to resolve vulnerabilities, update tech stacks, and improve CI/CD pipelines.

The role combines software engineering, DevOps, SRE, test automation, and application security, with roughly 70% hands-on coding and debugging.