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Technical Java/Kotlin Lead (AI agents) (#3849) Job Opening In Poland, Poland – Now Hiring N-iX


Job description

Work type: Office/Remote Technical Level: Manager Job Category: Software Development Project: American multinational e-commerce company

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

    Required Skill Profession

    Computer Occupations


    • Job Details

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