I am exclusively headhunting for a hyper-growth, venture-backed fintech startup that is completely disrupting the cross-border digital treasury and real-time FX landscape. They deploy an AI-powered, real-time capital connectivity platform to multinational corporate treasuries, while white-labeling their infrastructure directly to giant global banks.
Following massive revenue growth, we are doubling the London engineering team. This is a pure greenfield engineering environment with zero corporate bureaucracy and high-stakes technical complexity.
The Role
I am looking for a heavy-hitting, backend-focused C# / .NET Software Engineer to take absolute ownership of core transaction infrastructure, multi-bank API connectors, and real-time event-driven pipelines.
You will be embedding AI automation into financial workflows, building agentic LLM pipelines for automated data classification, and engineering low-latency transaction normalization engines where millions of pounds in cross-border liquidity are processed under high concurrent load.
Core Responsibilities
- Distributed Architecture: Design and build horizontally scalable microservices and real-time API integrations connecting to global banking rails.
- AI & Automation: Integrate advanced AI/LLM tooling (e.g., Claude Code, OpenAI API) to build intelligent data classification and automated workflow engines.
- High-Concurrency Engineering: Solve complex data correctness challenges, handling multi-bank event streams, exactly-once processing, and retry-backed message pipelines.
- Greenfield Delivery: Write clean, high-performance .NET 8/9 code, driving features from architectural conception to live production.
What We Are Looking For
- The Tech Stack: Deep, production-grade mastery of C# and modern .NET Core / .NET 8+, SQL, and familiarity with AI integration.
- Domain Experience: A proven track record handling complex data streams—ideally within Fintech, FX, Payments, Front-Office Trading, or low-latency infrastructure.
- Architectural Fluency: Event-driven architecture, asynchronous messaging (RabbitMQ/Service Bus), and caching (Redis).
- The Startup Mindset: High technical autonomy and a passion for engineering craftsmanship using modern tools.
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