Technical Java/Kotlin Lead

5 days ago

Bucharest, Bucureşti, Romania N-iX Full time €104,000 - €130,878 per year

We are seeking an experienced Java Lead with a strong Java and distributed systems background to lead our cross-functional team based in Poland. This role combines deep technical expertise with people leadership responsibilities across backend and mobile engineering.

Our client, headquartered in California, is a global e-commerce leader connecting millions of buyers and sellers in over 190 markets. You will lead a team delivering cutting-edge AI/ML-powered experiences that transform the way people shop and sell online.

Your Role:

As an Java Lead, you will be responsible for the technical direction, people development, and delivery execution of a high-performing team. You will collaborate closely with product, AI/ML, and platform teams to design and deliver scalable features, ensuring operational excellence, clean architecture, and reliable services.

Key Responsibilities

  • Lead and mentor a cross-functional team of backend (Java/Kotlin) and mobile engineers (iOS/Android)
  • Drive architecture and design decisions for large-scale, distributed systems
  • Provide technical leadership in areas such as API contracts (FGQL, REST, WebSockets), service integration, and performance optimization
  • Promote best practices in observability, including metrics, tracing, and alerting
  • Organize and lead on-call rotations, ensuring effective incident response and root-cause analysis
  • Partner with product and ML stakeholders to define scope, set priorities, and ensure delivery of impactful solutions
  • Conduct regular code and design reviews, contributing hands-on when needed to guide complex implementations
  • Foster a culture of ownership, technical excellence, and continuous improvement

Qualifications:

  • 2+ years of experience as Tech Lead with direct team leadership responsibilities
  • 7+ years of backend development experience with Java or Kotlin
  • Deep expertise in designing scalable distributed systems and microservices architectures
  • Strong understanding of API contract design and maintenance: FGQL, REST, WebSockets
  • Solid experience with Spring Framework and related Java/Kotlin tooling
  • Hands-on experience leading teams through operational responsibilities, including on-call rotations
  • Proficiency in modern observability practices: logs, metrics, tracing, incident response
  • Excellent English communication skills (C1 level or above)
  • BSc or MSc in Computer Science, Engineering, or a related technical field.

Preferred Qualifications:

  • Experience with Apache Kafka or other real-time streaming systems
  • Knowledge of reactive programming (e.g., Project Reactor)
  • Experience with Docker and Kubernetes in a production environment
  • Exposure to AI/ML-based applications or infrastructure
  • Experience in e-commerce or consumer-facing platforms operating at scale

We offer*:

  • Flexible working format - remote, office-based or flexible
  • A competitive salary and good compensation package
  • Personalized career growth
  • Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
  • Active tech communities with regular knowledge sharing
  • Education reimbursement
  • Memorable anniversary presents
  • Corporate events and team buildings

  • Other location-specific benefits

  • not applicable for freelancers

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