Senior Java Backend Dev – Microservices
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Join a Unified Commerce engineering squad as a Senior Java Backend Developer, on a freelance basis through Shakers.
Shakers connects senior independent talent with product companies across Europe - this is a freelance engagement, not an in-house hire, and the client is disclosed once you're through initial screening.
What you'll own:
- Lead design and implementation of complex Java microservices across Unified Commerce products - Define and enforce architectural patterns, coding standards, and security practices for the squad - Own IAM strategy: Keycloak realm design, Okta federation, OIDC flow architecture - Drive technical discussions with product owners and architects, representing engineering - Identify and resolve performance bottlenecks, scalability issues, and security vulnerabilities - Lead code reviews and establish quality gates;
champion SonarQube and Snyk adoption - Mentor confirmed and junior engineers - Produce technical documentation, ADRs, and runbooks
What we're looking for:
- 8+ years of software engineering experience - Expert-level Java and Spring/Spring Boot - Advanced microservices architecture experience - Hands-on with Amazon SQS, Docker, Kubernetes, MongoDB, MySQL - Experience with Keycloak, Okta, OIDC - Familiarity with SonarQube and Snyk - English C1, Portuguese C1 - Available hybrid, 3 days/week on-site in Lisbon
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