76 to 100 of 182 FastAPI Jobs in the City of London

tech firm. You have taken entire products or features from ideation to production and you've measured their impact. You have experience with the following technologies (or similar): Python, FastAPI, Postgres, ElasticSearch, RabbitMQ, LLMs, Typescript, React You enjoy diving deep into the domain, understanding the problem, and focusing on delivering value to the customer. You thrive in a fast paced More ❯

tech firm. You have taken entire products or features from ideation to production and you've measured their impact. You have experience with the following technologies (or similar): Python, FastAPI, Postgres, ElasticSearch, RabbitMQ, LLMs, Typescript, React You enjoy diving deep into the domain, understanding the problem, and focusing on delivering value to the customer. You thrive in a fast paced More ❯

to provide enhances analytics and tooling for Traders and Front Office teams To be a successful applicant, you will need: Extensive experience of Software Engineering using Python (Pandas, Numpy, FastAPI) to a high standard, building highly performant systems and platforms used by Traders Experience working in a Hedge Fund, Trading firm, or similar working directly with front-office stakeholders (e.g. More ❯

to provide enhances analytics and tooling for Traders and Front Office teams To be a successful applicant, you will need: Extensive experience of Software Engineering using Python (Pandas, Numpy, FastAPI) to a high standard, building highly performant systems and platforms used by Traders Experience working in a Hedge Fund, Trading firm, or similar working directly with front-office stakeholders (e.g. More ❯

to deploy and scale AI models into production Requirements 36 years of experience as a Python Developer/Software Engineer Strong Python skills with experience in frameworks such as FastAPI Solid understanding of software engineering principles and design patterns Strong foundation in Computer Science (BSc/MSc from a top university) Desirable: experience with AWS, frontend skills Startup experience is More ❯

deploy and scale AI models into production Requirements • 3–6 years of experience as a Python Developer/Software Engineer • Strong Python skills with experience in frameworks such as FastAPI • Solid understanding of software engineering principles and design patterns • Strong foundation in Computer Science (BSc/MSc from a top university) • Desirable: experience with AWS, frontend skills • Startup experience is More ❯

quality What you will bring Strong Python in production and senior-level ownership Depth in one of: algorithms, optimisation, ML, signal processing, or EDA Experience with some of: Django, FastAPI, GraphQL, PostgreSQL, Redis, Docker, pytest, mypy Pragmatic testing, profiling, and code review habits Our tech Python 3.11, Django, GraphQL, PostgreSQL, Redis, Docker, CI, mypy. TypeScript and React on the product More ❯

quality What you will bring Strong Python in production and senior-level ownership Depth in one of: algorithms, optimisation, ML, signal processing, or EDA Experience with some of: Django, FastAPI, GraphQL, PostgreSQL, Redis, Docker, pytest, mypy Pragmatic testing, profiling, and code review habits Our tech Python 3.11, Django, GraphQL, PostgreSQL, Redis, Docker, CI, mypy. TypeScript and React on the product More ❯

optimise Large Language Models (LLMs) for performance, accuracy, and cost efficiency. Build evaluation pipelines to ensure model reliability and stability. Develop secure and scalable Python applications and RESTful APIs (FastAPI, Django REST Framework). Integrate AI services and foundation models from providers such as Azure AI , Amazon Bedrock , and Google Vertex AI . Work with vector databases and retrieval mechanisms More ❯

optimise Large Language Models (LLMs) for performance, accuracy, and cost efficiency. Build evaluation pipelines to ensure model reliability and stability. Develop secure and scalable Python applications and RESTful APIs (FastAPI, Django REST Framework). Integrate AI services and foundation models from providers such as Azure AI , Amazon Bedrock , and Google Vertex AI . Work with vector databases and retrieval mechanisms More ❯

and data workflows Create seamless integrations with external systems Champion AI-assisted development practices across the engineering team What You'll Do: Own backend features and API integrations (Python, FastAPI, gRPC, SQL) Adapt and extend auto-generated pipelines and front-end outputs Build connectors for APIs, files, and external systems Integrate LLM-based capabilities with robust evaluation and monitoring Champion More ❯

and data workflows Create seamless integrations with external systems Champion AI-assisted development practices across the engineering team What You'll Do: Own backend features and API integrations (Python, FastAPI, gRPC, SQL) Adapt and extend auto-generated pipelines and front-end outputs Build connectors for APIs, files, and external systems Integrate LLM-based capabilities with robust evaluation and monitoring Champion More ❯

with a focus velocity Excellent communication skills and the ability to flourish in a team Located in London/Paris and open to working in office Tech Stack: Python FastAPI Python, Typescript, or React Open source LLMs Building for production Benefits Currently Offered (likely to improve as company grows): 100% coverage for travel expenses Childcare support Min. 3 months fully More ❯

with a focus velocity Excellent communication skills and the ability to flourish in a team Located in London/Paris and open to working in office Tech Stack: Python FastAPI Python, Typescript, or React Open source LLMs Building for production Benefits Currently Offered (likely to improve as company grows): 100% coverage for travel expenses Childcare support Min. 3 months fully More ❯

that frequently gets deployed to users Strong understanding of product development and navigating large codebases Located in London/Paris and open to working in office Tech Stack: Python FastAPI Typescript + React Open source LLMs On premise deployments Benefits Currently Offered (likely to improve as company grows): 100% coverage for travel expenses Childcare support Min. 3 months fully paid More ❯

Experience building agentic systems and integrating multiple LLMs to automate or enhance workflows. Strong knowledge of server-side languages and frameworks (Node.js with Express, or Python with Django/FastAPI). Solid understanding of SQL and NoSQL databases (PostgreSQL, MySQL, MongoDB) and database design principles. Strong analytical and mathematical foundation, with hands-on experience in data analysis. Bonus: You’re More ❯

that frequently gets deployed to users Strong understanding of product development and navigating large codebases Located in London/Paris and open to working in office Tech Stack: Python FastAPI Typescript + React Open source LLMs On premise deployments Benefits Currently Offered (likely to improve as company grows): 100% coverage for travel expenses Childcare support Min. 3 months fully paid More ❯

Agent Development : Hands-on experience building applications with large language models, implementing advanced prompting techniques, RAG systems, and agentic workflows Backend Engineering : Proficient in Python and backend frameworks (e.g. FastAPI, Django, Flask); understanding of distributed systems and scalable architectures AI/ML Frameworks : Experience with PyTorch, Hugging Face Transformers, LangChain, or similar frameworks for building LLM applications Data & Storage Systems More ❯

Agent Development : Hands-on experience building applications with large language models, implementing advanced prompting techniques, RAG systems, and agentic workflows Backend Engineering : Proficient in Python and backend frameworks (e.g. FastAPI, Django, Flask); understanding of distributed systems and scalable architectures AI/ML Frameworks : Experience with PyTorch, Hugging Face Transformers, LangChain, or similar frameworks for building LLM applications Data & Storage Systems More ❯

maintain clean, reliable data pipelines and internal tools Collaborate with technical and non-technical stakeholders What You Bring 3–5+ years of experience in software engineering (Python) Experience with fastAPI, cloud platforms (AWS, Azure, or GCP), Docker. Bonus: experience with ML workflows, Spark, Airflow, or trading systems Why Join Up to £140K Up to 100% bonus Relocation package Flat, entrepreneurial More ❯

make a real impact in a rapidly growing team, while working on cutting-edge AI technology. What You'll Work On: Design and implement scalable backend systems using Python (FastAPI, Flask, or Django) Integrate AI-generated code into production-ready services Take ownership of projects from idea to production — collaborating across product and AI teams Experiment with LLM- and agentic More ❯

make a real impact in a rapidly growing team, while working on cutting-edge AI technology. What You'll Work On: Design and implement scalable backend systems using Python (FastAPI, Flask, or Django) Integrate AI-generated code into production-ready services Take ownership of projects from idea to production collaborating across product and AI teams Experiment with LLM- and agentic More ❯

term Strategic IT project, with ongoing contract extensions. Core Technical Skills Programming: Python Data Handling: NumPy, Pandas, SQL Version Control: Git/GitHub System Integration & Deployment Model Deployment: Flask, FastAPI, MLflow Model Serving: Triton Inference Server, Hugging Face Inference Endpoints API Integration: OpenAI, Anthropic, Cohere, Mistral APIs LLM Frameworks: LangChain, LlamaIndex – for building LLM-powered applications Vector Databases: FAISS, Weaviate More ❯

term Strategic IT project, with ongoing contract extensions. Core Technical Skills Programming: Python Data Handling: NumPy, Pandas, SQL Version Control: Git/GitHub System Integration & Deployment Model Deployment: Flask, FastAPI, MLflow Model Serving: Triton Inference Server, Hugging Face Inference Endpoints API Integration: OpenAI, Anthropic, Cohere, Mistral APIs LLM Frameworks: LangChain, LlamaIndex for building LLM-powered applications Vector Databases: FAISS, Weaviate More ❯

background from a leading university. Deep experience with modern JavaScript frameworks (React preferred), TypeScript, and data visualisation tools. Proficiency in Python and familiarity with data workflows and backend frameworks (FastAPI/Flask). No sponsorship available – candidates must have the right to work in the UK. More ❯