Senior Java Full Stack Developer

O projekcie: Senior Java Full Stack Developer 📍 Location: Kraków, Poland (hybrid: 2 days in the office, 3 days remote) 📄 B2B Contract: 190 – 230 PLN / hour We are looking for a Senior Java Full Stack Developer to join the Global HMS engineering team within Markets & Securities Services IT. In this role, you will contribute to the development and support of a key global platform, working closely with business stakeholders and distributed engineering teams. You will take ownership of application enhancements, production stability, and end‑to‑end support activities, ensuring high service quality and timely delivery. This position is ideal for someone who enjoys combining hands‑on development with operational responsibility, thrives in a global environment, and is comfortable working across backend, frontend, DevOps, and support streams. Key Responsibilities: - Deliver application enhancements and provide day‑to‑day support within a global engineering setup. - Collaborate with business stakeholders to plan and execute deliveries, ensuring milestones are met. - Lead and resolve critical production incidents, driving fixes through to completion. - Own end‑to‑end production support: handling tickets, queries, and operational requests. - Diagnose and resolve application issues to maintain performance, reliability, and usability. - Create and maintain technical documentation, best‑practice guidelines, and process artefacts. - Act as an SME for service functionality, constraints, and operational considerations. - Identify and escalate risks, issues, and dependencies during agile delivery. - Continuously develop skills through training, certifications, and hands‑on learning. What We Offer: - Long‑term cooperation in a global engineering environment. - Real influence on service quality, operational stability, and delivery processes. - Work in a multicultural, distributed team. - Private medical care (LuxMed) and Multisport card. - Hybrid model: 2 days per week in the Kraków office. Wymagania: - Strong experience with Java 21, Spring Boot 3.x, microservices, REST APIs, JSON.- Frontend experience with React JS.- Solid understanding of PostgreSQL and messaging technologies (MQ/Solace).- Working knowledge of Kubernetes, Redis, and application security principles.- Exposure to observability and DevOps tooling: Grafana, Splunk, Logstash, Prometheus, OpenTelemetry, Zipkin, Jenkins, Ansible.- Strong communication skills and ability to collaborate across distributed teams.- High responsiveness and ownership mindset, especially in production support contexts.- Ability to produce clear, concise documentation and technical deliverables.- Comfortable working in a DevOps model, contributing across analysis, testing, and support. Nice to Have: - Basic Python, Activiti (workflow engine), JMock/Mockito, shell scripting.- Experience with Selenium or Serenity.- Background in workflow‑based applications.