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Senior Developer/Tech lead (Java) at Bookmap LTD. Location Information: Europe. About the Role. . We’re looking for a . Senior Developer/Tech Lead.  who thrives on solving complex technical problems and enjoys leading a team working on performance-critical systems.. . This is a . fully remote position. , offering flexibility while working on a product that processes massive real-time data streams and delivers high-end visual analytics.. . What You’ll Do. . . Design and develop high-performance desktop applications. . Tackle complex challenges in . algorithms, data structures, and concurrency. . Optimize systems for speed and efficiency under heavy data loads. . Lead and mentor a team of engineers. . Contribute to architectural decisions and technical direction. . . What We’re Looking For. . . 8+ years of experience in Java development. . Strong fundamentals in . algorithms, data structures, and multithreading. . Experience with performance optimization. . Leadership mindset or experience leading teams. . Solid English communication skills. . . Nice to Have. . . Background in competitive programming (ACM, ICPC, Olympiads, etc.). . . What Makes This Role Unique. . . Focus on . desktop application development.  (no Spring, no off-the-shelf databases). . Work on systems handling . hundreds of thousands of events per second. . . What We Offer. . . 100% remote work with flexible setup. . Paid annual and sick leave. . Budget for equipment and software (scaled with tenure). . Sponsored training and English lessons. . Collaborative, international team environment. . . Hiring Process. . The first step to our process is a . paid technical task. :. . . Takes ~90 minutes on average. . Please do not use AI. . Compensation: . $100.  (upon successful completion and interview participation). . Focus on performance and correctness. . . You’ll receive a pass/fail result, and successful candidates will move forward in the process.. . About Bookmap. . Bookmap is a leading high-performance visualization and trading platform that transforms how market data is understood.. . Our platform is widely used across major exchanges, including CME, Eurex, Nasdaq, and crypto markets.