# Senior AI Platform Engineer Source: https://realanalystjobs.com/job/senior-ai-platform-engineer-9fin-206bcf94 Senior AI Platform Engineer at 9Fin, an on-site role based in London, UK. Experience level: 5+ Years. Posted on 6 July 2026, read from 9Fin's own careers page (Ashby), which RealAnalystJobs re-checks daily and removes the role when it closes. 9Fin is on the Home Office register of licensed visa sponsors. Updated 15 November 2026. ## Key facts - Company: [9Fin](https://realanalystjobs.com/companies/9fin) - Location: London, UK - Work mode: On-site - Posted: Jul 6, 2026 - Employment type: Full time - Experience level: 5+ Years - Source: 9Fin's careers page (Ashby), re-checked daily Skills: [Python](https://realanalystjobs.com/skills/python), AWS ## Visa sponsorship The posting does not say. 9Fin had H-1B petitions approved for 2 workers in fiscal year 2026 (USCIS). That is history, not a promise for this role. [See the record](https://realanalystjobs.com/companies/9fin#h1b-record) Licensed UK sponsor. Licensed by the Home Office to sponsor Skilled Worker visas (register of 27 Oct 2026). A licence means the employer can sponsor; it does not mean every role will be sponsored. Listed as 9fin Limited (London). ## About this role About 9fin 9fin is the AI platform powering global debt markets - the world’s largest asset class at over $145 trillion. Debt markets are vast, global, and mission-critical, yet still run on fragmented data, PDFs, and manual workflows. 9fin replaces this broken infrastructure with a single platform that centralises proprietary credit data, deep analysis, and high-value workflows across global markets. Today, 9fin powers teams at 300+ blue-chip institutions worldwide, including global banks, asset managers, private equity firms, law firms, and advisors. The business is scaling at exceptional speed, with rapid expansion in the US and best-in-class retention driven by deep workflow adoption. We’re at a defining inflection point. With proven product-market fit and strong, global market pull, 9fin is accelerating toward becoming the category-defining platform for debt markets worldwide. The Opportunity Debt is a $145 trillion market that still runs on PDFs and spreadsheets. 9fin is changing that: AI-powered intelligence that gives 300+ banks, asset managers, PE firms and law firms the answer in minutes, not days. We’ve just closed our Series C, and AI is at the heart of what we build next. We’re looking for a Senior AI Platform Engineer to build the foundation beneath it. This is greenfield: a V1 exists, but the big decisions are still ahead. You’ll design the core platform behind Generative AI, Agentic AI and ML at 9fin: one home for every agent, delivering “AI as a service” to a dozen or more teams. Your work will power everything from document understanding to autonomous agents that run scheduled workflows, write morning briefings and flag distressed companies. What You’ll Work On No two weeks look the same, but you can expect to: • Build the platform behind our agents: agent runtime and orchestration, model serving, sandboxing, and tracing and evals • Create shared components: prompt management, AI gateways and evaluation services • Ship APIs, SDKs and tooling so teams can launch agents without rebuilding infrastructure • Design secure, scalable deployment pipelines for models and applications • Build observability: tracing, evaluation, cost and quality in production • Set standards for testing, governance, Responsible AI and operations, and keep evolving the platform as the ecosystem moves What Makes This Role Different Build, don’t maintain. Many architectural decisions are still open, and they’re yours to shape. A real roadmap. Memory, artifacts and event-driven agents come first. Within six months, you’ll help ship agents that run autonomously in the background. A top 2027 bet. Agent orchestration is a strategic priority, and you’ll help drive it, towards a 9fin experienced through agents. Leverage. You’ll build shared capabilities that let multiple teams ship AI at scale, rather than owning a single product. Real influence. You’ll be one of a small group of senior engineers shaping direction alongside the Engineering Lead. No management duties required. About You You’ll be a great fit if you are an engineer who has built real AI systems in production, cares about developer experience, and wants to own something from the ground up. AI Platform Engineering • 5+ years of software engineering experience, including 2+ years building AI/ML platforms, Generative AI applications or production machine learning systems • Experience designing and deploying enterprise AI applications to production, with a focus on scalability, reliability and developer experience LLMs & Agentic AI • Hands-on experience building applications powered by Large Language Models • Experience building Model Context Protocol (MCP) and Retrieval-Augmented Generation (RAG) solutions, using embeddings, vector databases and modern LLM orchestration frameworks • Experience building or contributing to agentic AI systems, intelligent workflows or orchestration frameworks Backend & Platform Engineering • Strong backend engineering with production experience in Python and/or TypeScript • Experience designing scalable backend services and REST APIsExperience building reusable platform capabilities, internal developer tooling, SDKs or shared engineering services Cloud & Infrastructure • Strong experience building cloud-native applications • Comfortable with Docker, Kubernetes, CI/CD pipelines and containerised deployments • Experience with solutions such as AWS Bedrock and AgentCore • Understanding of how to deploy, monitor and operate AI services in production AI Operations & Observability • Experience implementing monitoring, tracing, evaluation and cost optimisation for AI systems • Experience with observability tools such as Langfuse, Arize Phoenix, or Langsmith • Understanding of the operational challenges of LLM-powered applications, including latency, reliability, hallucination monitoring and model quality evaluation Collaboration & Technical Leadership • You enjoy working across engineering disciplines to shape technical direction and set best practice • You are comfortable being one of a small group of senior engineers, influencing architecture and platform direction without needing formal management responsibility • You thrive in fast-moving environments where much is still being designed and built • You have driven projects rather than just contributed to them, and can explain the impact of what you built Bonus Points Experience with any of the following will help: • AI gateways and model routing • Prompt management platforms • AI evaluation frameworks • LangGraph, LangChain, LlamaIndex, DSPy, CrewAI or similar orchestration frameworks • Vector databases and semantic retrieval • Knowledge graphs or document understanding systems • Building internal AI platforms used by multiple engineering teams Benefits We’re a scaling start up, and we enjoy sharing our success, when the company succeeds, we always reinvest that in our people. We also offer huge amounts of resp Description from 9Fin's public careers feed, reproduced so you can read the role here. Apply on the company's own site; Real Analyst Jobs never submits anything for you. ## How to apply Open [this role on Real Analyst Jobs](https://realanalystjobs.com/job/senior-ai-platform-engineer-9fin-206bcf94) and use Apply now there to reach the employer's application. The listing is re-checked against 9Fin's careers page daily and removed when it closes. ## 9Fin Analyst roles on Real Analyst Jobs. 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