Lead architect and primary builder of a production-grade, AI-first .NET platform: productionize AI workflows, design agentic AI loops, implement evals/guardrails, and deploy scalable Azure/AWS infrastructure for high-concurrency workloads while adopting AI-assisted tooling.
We have a working AI Proof of Concept (PoC) that proves our vision; now we need the engine that powers the product at scale. As our Senior Software Engineer, you will be the lead architect and primary builder of our production-grade, AI-first .NET platform.
Working directly with the Head of Technology, you will be responsible for moving us from experimental scripts to a robust, observable, and scalable Agentic AI Architecture. We are a high-velocity team that values "Ship Fast, Fix Fast." We utilize agentic AI tools like Claude Code to bypass the boilerplate, freeing you to focus on the high-value architectural challenges of a production-ready system.
What You’ll Do
- Productionize AI Workflows: Transform raw AI prompts and experimental logic into resilient production code using .NET 10/C# 14.
- Architect Agentic Systems: Design and build the "Agent Loops" (Planning → Execution → Observation) that allow our AI to interact reliably with our internal databases and external APIs.
- Build for Reliability: Implement "Evals" and Guardrails to manage the non-deterministic nature of LLMs, ensuring outputs are safe, accurate, and consistent for our users.
- Cloud Infrastructure: Partner with the Head of Tech to design and deploy the Azure/AWS infrastructure required to support high-concurrency AI workloads, focusing on latency and cost-per-token optimization.
- AI-First Tooling: Lead the team in adopting and optimizing AI-assisted development workflows (Claude Code, Cursor, etc.) to maintain our 10x velocity.
- Strategic Evolution: Collaborate on the long-term technical roadmap, identifying when to use fine-tuned Small Language Models (SLMs) vs. Frontier LLMs.
RequirementsThe "Must-Haves"
- C# Mastery: You are an expert in the modern .NET ecosystem.
- PostgreSQL Expert: You know how to design schemas, optimize queries, and leverage Postgres for high-performance applications.
- Architectural Thinker: You can look at a PoC and know exactly what it needs to survive 100x the current load.
- Blazor: Experience with Blazor (Server or WebAssembly) for building real-time UIs.
- Azure ML: Any exposure to Azure Machine Learning services or deploying ML models into a production pipeline.
- AI Workflow: You already use Claude Code, Cursor, or GitHub Copilot in your daily flow.
Top Skills
.Net 10,C# 14,Postgresql,Azure,Aws,Claude Code,Cursor,Blazor,Azure Machine Learning,Github Copilot,Llms
Zendbox London, England Office
London, United Kingdom
Similar Jobs
Fintech • Mobile • Payments • Software • Financial Services
Lead analytics for the Account Management team: drive data-driven decisions, run A/B and causal analyses, set and monitor KPIs, own balance data domain, and partner with product, engineering, design, and compliance to prioritise and deliver high-impact product improvements.
Top Skills:
AirflowDbtLookerPythonSQL
Fintech • Information Technology • Financial Services
Design, build, and operate enterprise-grade, cloud-native data platforms and pipelines for Preqin's Company Intelligence. Provide technical architecture, end-to-end delivery, data governance, observability, and reliability while leading and mentoring a small team and partnering with product and analytics to deliver measurable business value.
Top Skills:
Apache AirflowAWSAzureCi/CdDbtGitKubernetesPythonSnowflakeSQLTerraform
Fintech • Information Technology • Financial Services
Responsible for providing tax advice and structuring for BlackRock's private markets investment platform, overseeing compliance, and developing tax strategies.
Top Skills:
Financial ProductsLegal DocumentationTax Laws
What you need to know about the London Tech Scene
London isn't just a hub for established businesses; it's also a nursery for innovation. Boasting one of the most recognized fintech ecosystems in Europe, attracting billions in investments each year, London's success has made it a go-to destination for startups looking to make their mark. Top U.K. companies like Hoptin, Moneybox and Marshmallow have already made the city their base — yet fintech is just the beginning. From healthtech to renewable energy to cybersecurity and beyond, the city's startups are breaking new ground across a range of industries.
