Senior .NET Developer (Trading/HFT/Low-Latency) - Full Remote Global

ABOUT THE OPPORTUNITY A fintech specialised in trading platform development is looking for a Senior+ .NET Developer to join a team building professional-grade trading infrastructure. This is a high-performance engineering role for someone who lives and breathes low-latency .NET, has made real architecture decisions in production, and is comfortable operating in a fast-moving, distributed fintech environment. There is a potential path to direct employment following the consulting engagement. Language: English B2 minimum (fluent spoken and written required) | Level: Senior+ | Location: Fully remote, global | Timezone: Minimum 4h overlap with 9AM–5PM EST PROJECT & CONTEXT You'll be contributing to a professional-grade trading platform ecosystem — spanning desktop and web trader solutions and order management — where performance, reliability, and low latency are non-negotiable. Architecture decisions matter here, and you'll be expected to both make them and explain them clearly to a distributed international team. WHAT WE'RE LOOKING FOR Strong grasp of algorithms and data structures , applied in performance-critical production contexts Deep hands-on experience with performance-critical .NET — multithreading, memory management, allocation optimisation, GC tuning, and use of Span and structs Proven experience in trading, fintech, HFT, or low-latency/real-time systems Track record of making real architecture decisions in production environments, not just implementing requirements Experience mentoring other developers and elevating team engineering standards Degree in Computer Science, Mathematics , or a related technical field Fluent English — spoken and written, with the ability to clearly articulate technical decisions on calls with a distributed team Available for at least 4 hours of overlap with 9AM–5PM EST NICE TO HAVE Experience with OMS (Order Management Systems) or prop firm trading infrastructure Familiarity with desktop application development in .NET (WPF or similar) Background in market data processing or real-time data feeds Interest in or openness to subsequent direct employment with the client company Compensation: €2,300 – €3,050/month net, depending on experience and seniority level. Why HumanIT people stay (4.4 Glassdoor, 89% recommend) - 15th month salary - Health insurance covering your family - Birthday off - Mobility program for digital nomads - Real work-life balance Full benefits https://www.humanit.pt/careers/#perks What it's really like https://www.humanit.pt/careers/#work-at