Lead Java Engineer

N-iX is looking for Lead Java Engineer for a global technology company serving large enterprises with mission-critical SaaS products in the brand protection and domain management space.

The Client is consolidating multiple client portals into a single modern platform on AWS, with migration of existing clients onto it. The work spans application development, cloud infrastructure, and platform reliability as the new system scales.

Requirements

• 7+ years of commercial Java engineering experience, including a technical leadership role on complex backend systems
• Strong hands-on expertise with Java 21, and comfort working with older Java versions in legacy code
• Deep expertise across the Spring ecosystem — Spring Boot, Spring MVC/Web, Spring Security, Spring Data JPA, JDBC, Spring Session, Actuator
• Solid experience with RabbitMQ and event-driven / asynchronous messaging
• Experience with Redis (caching, sessions)
• Strong relational database and SQL skills — data modeling, schema design, query optimization
• Working experience with AWS
• Proven track record designing and integrating REST APIs and distributed services
• Significant experience with data migration, ETL, or system integration at scale
• Strong testing discipline and a quality-first mindset — unit and integration testing
• Ability to own technical decisions, set standards, and mentor other engineers
• Ability to lead architecture and work-breakdown sessions and translate ambiguous business needs into a clear technical plan
• Build tooling with Maven
• Ability to work embedded within a client's team as part of a close partnership
• Ability to work with significant overlap with US Mountain Time, especially during ramp-up — distributed team across US / UK / Brazil
• Excellent English communication skills
• Experience working in Agile / Scrum / Kanban

Tech stack: Java 21 (some older versions in legacy services), Spring Boot, Spring MVC/Web, Spring Security, Spring Data JPA, JDBC, Spring Session, Actuator, Redis, RabbitMQ, Maven.

Responsibilities

• Lead the design and delivery of core backend services and data migration components
• Own the design of integration and synchronization logic between legacy and new systems
• Drive architecture and work-breakdown sessions; define, estimate, and sequence the work with the Client's senior engineers
• Set engineering standards and best practices; mentor and guide other engineers on the team
• Ensure strong test coverage and quality across the codebase
• Troubleshoot production and integration issues and lead root-cause analysis
• Participate in and lead code reviews, maintaining code quality standards
• Engage with Client engineering counterparts in US / UK / Brazil on integration points and delivery milestones
• Participate in Agile ceremonies (stand-ups, planning, retros, demos)

Nice to Have

• Experience with AI-assisted development tools (Copilot, Claude, Cursor)
• Background in SaaS, multi-tenant platforms, or large-scale B2B portals
• Experience leading large-scale data migration between production systems
• Experience integrating with third-party / external partner systems via asynchronous protocols