Senior Java Software Engineer (Contractor) UK-based | Fully remote Outside IR35 Contract to Dec 2026 We are supporting a global engineering and technology organisation in the search for a Senior Java Software Engineer (Contractor) to join their Performance Engineering & Research team. This is a fully remote opportunity (UK-based candidates only) working on robust, scalable software that supports sophisticated control algorithms and performance optimisation systems. The Role Design, build and maintain efficient, high-performance Java applications, contributing across the full software development lifecycle including requirements analysis and system design, development and implementation, testing and deployment, CI/CD and automation improvements, and technical documentation. Work under the guidance of the Principal Performance Engineer, collaborating with solution design, integration, simulation and delivery teams globally. What We're Looking For Minimum 5 years’ professional Java development experience. Strong understanding of OOP, design patterns and software architecture principles. Proven experience delivering scalable, maintainable systems. Experience with version control (Git) and CI/CD tools (e.g., Jenkins). Exposure to containerisation and logging technologies (e.g., Docker, ELK). Strong analytical and problem‑solving capability. Excellent communication skills. Nice to have: Experience within logistics, WMS or warehouse automation — however strong Java developers from any industry will be considered. Contract Details Fully remote (UK-based candidates only). Outside IR35. Contract funded through December 2026. Full-time engagement. ASAP start. No predefined rate band — quality is prioritised. ATA is committed to creating a diverse workforce and is an equal opportunities employer. We welcome applications from all suitably qualified persons regardless of age, disability, gender, marriage and civil partnership, pregnancy and maternity, race, religion or belief, sex, and sexual orientation. #J-18808-Ljbffr