1 to 25 of 37 Permanent FastAPI Jobs in the South East

building scalable mobile APIs (REST, etc.). Good principles of security management (secrets, protocols, etc.). Experience with some Python web frameworks (Django, Flask, FastAPI, etc.). Desirable Skills Can speak, or learning to speak, more than one language Experience with real-time databases. Experience with in-memory databases. Experience ...

uncertainty environments Excellent communication and collaboration skills Demonstrated curiosity and drive to learn through experimentation Preferred: Familiarity with tech stack: Next.js, React, TypeScript, Python, FastAPI, Postgres, Redis Experience with cloud infrastructure (AWS, GCP) Exposure to or experience with foundation models or Generative AI (LLMs, RAG, fine-tuning, agents, evals ...

capabilities , including: Large Language Models (LLMs) Retrieval-Augmented Generation (RAG) AI agents and orchestration workflows Designing and maintaining backend services and APIs (primarily Python, FastAPI/Flask) Building and scaling data pipelines and search systems using: ElasticSearch, Weaviate, Pinecone, and other vector databases Engineering secure, containerised architectures using Docker ...

related field. 7+ years of hands-on software engineering experience, ideally in AI, SaaS, or automation platforms. Deep expertise in Python; familiarity with FastAPI, Flask, or Django. Experience with cloud infrastructure, Kubernetes, and microservices-based systems. Familiarity with development methodologies, Git, and CI/CD workflows. Demonstrated ability to lead ...

compliance in production systems Improving performance, scalability, and system resilience The ideal candidate will: 5+ years of backend engineering experience Strong Python experience (FastAPI, Flask, or Django) Have experience working at a previous startup/scale up Solid knowledge of PostgreSQL and Redis Experience with async task queues and message ...

designing systems mentoring others and shaping technical direction while still staying hands on with code. Tech wise the environment is heavily Python led with FastAPI and Flask strong typing PostgreSQL at the core and AWS serverless across the platform. Plenty of greenfield thinking around developer experience automation and scalable architecture. ...

Reviewing feature designs from a testability perspective Participating in architecture discussions with a quality lens Our Client's Tech Stack (Context) Backend: Python 3.11+, FastAPI Frontend: TypeScript, React Infra: AWS (ECS/Fargate, S3, RDS, CloudFront) Data: PostgreSQL, CSV/Parquet CI/CD: GitLab CI IaC: Terraform Testing: Pytest ...

About Persistent: We are an AI-led, platform-driven Digital Engineering and Enterprise Modernization partner, combining deep technical expertise and industry experience to help our clients anticipate what's next. Our offerings and proven solutions ...

Quant Dev or Systematic Trading environment at a top fund or bank. Coding Mastery: Expert proficiency in Python (Polars/Dask/FastAPI) and/or C++. AI Native: Proven ability to use LLMs and Machine Learning to solve complex financial time-series problems. Industry Standard Experience: You have worked ...

stage environment (ownership, ambiguity, fast iteration) Someone who can collaborate well with technical + non-technical/domain experts Nice to have: Django/FastAPI AWS/cloud platform experience Scientific/healthcare/bioinformatics data exposure (not essential) Why it's interesting: Real-world impact in healthcare/life ...

Steadrock's internal systems: Compute Infrastructure (DGX) Manage our NVIDIA DGX server (Linux environment, CUDA, system health) Build, test, and maintain internal APIs (FastAPI/Flask) Design stable ngrok/reverse-proxy/network connections for remote access Optimise GPU utilisation and monitor performance AI Agent & Automation Development Develop pipelines … What You Need Technical Strong Python Experience with Linux (Ubuntu), bash, SSH Understanding of GPUs, CUDA basics, or willingness to learn fast Experience with FastAPI, Flask or similar Basic networking knowledge (ports, tunnels, proxies) SQL or NoSQL experience Preferred Experience with LLM APIs (OpenAI, Anthropic, DeepSeek, Qwen) Exposure to Docker ...

squad. You'll be building backend APIs and deploying them into a modern AWS + Kubernetes environment. The Role • Building backend APIs in Python (FastAPI ideally) • Working with PostgreSQL • Deploying services into AWS (EKS preferred) • Managing container workloads in Kubernetes • Building infrastructure with Terraform • Implementing CI/CD pipelines (GitHub … Actions, GitLab, Jenkins, ArgoCD) • Shipping production-grade cloud-native applications What We're Looking For Strong Python backend development experience API development (FastAPI highly desirable) Solid SQL/PostgreSQL knowledge AWS experience (EKS ideal) Kubernetes deployment experience Terraform (Infrastructure as Code) CI/CD automation experience Nice to have: Experience ...

Senior Software Engineer | London | £100,000 - £160,000 | Python | FastAPI | AWS Location: London based - hybrid Salary: £100,000 - £160,000 + equity Tech Stack: Backend: Python (experience with FastAPI or Django or Flask beneficial) Cursor, Claude Code AWS - experience with Azure & GCP beneficial Are you a backend engineer who cares … complex problems, and be part of an exceptional team, get in touch at . Senior Software Engineer | London | £100,000 - £160,000 | Python | FastAPI ...

High trust, high ownership: Make decisions that move the whole company forward. We value autonomy, speed, and impact. Stack: Build with modern tools — Python, FastAPI, TypeScript, LLMs, MLOps What We're Looking For 2+ years of software development experience Proven track record of building and shipping full-stack products … working in a fast-moving, high-ambiguity startup You're looking for a large team with established roadmaps and guardrails Tech Stack Core: Python, FastAPI, TypeScript, React AI/ML: OpenAI, Anthropic, computer use, evals, voice agents Infrastructure: Azure, Docker Process: Initial Screen (30 min video call with ...

enterprise workflows. What You'll DoBuild & own core backend systems · Build and optimise databases for complex, real-world data · Design and implement APIs using FastAPI for AI workflows and product features · Build and scale LangGraph-based multi-agent systems with checkpointing, retries, and observability · Integrate and scale vector search, knowledge … real customer usage and feedback What We're Looking For Essential · 2-3 years building backend systems for real users · Production experience with FastAPI (or similar modern Python frameworks) · Solid understanding of API design, PostgreSQL, and distributed systems fundamentals · Experience deploying and operating services on cloud infrastructure ...

architecture across the portfolio. Essential Requirements 3-6+ years building production-grade full-stack applications, with clear ownership. Strong backend experience in Python (FastAPI preferred) and solid database skills (PostgreSQL/MongoDB). Proven experience building and shipping mobile apps with React Native. Strong React fundamentals (Next.js experience … Security hygiene (secrets, permissions, least-privilege) and practical data-privacy basics. Planning & execution in Linear (or similar). Tools & Stack Backend/Runtime: Python (FastAPI), Node.js. Frontend: React/Next.js Mobile: React Native Datastores: PostgreSQL, MongoDB (as appropriate), Redis (caching/sessions). Vectors/Embeddings: Chroma (or similar). ...

Senior Full Stack Engineer (AI) | London | £100k to £150k | React | Django | FastAPI Location: London Salary: £100,000-£150,000 + benefits This role is for Engineers who are intellectual and driven by deep complexity. This is about building tools that help people make sense of exceptionally complex systems. You will … competent as they are ambitious. What you will be doing Building and evolving full stack applications used by technical teams, using Django, FastAPI & React Creating interfaces that help users understand complex behaviour and data Working closely with others to shape how tools should work and feel Balancing speed, quality ...

Lead Python Engineer | Python, FastAPI, Start-up | Remote, £90-105k I'm working with a well-funded, mission-driven healthtech company building innovative technology that makes healthcare more accessible and easier to use. They're scaling their engineering team as they expand their platform across the UK and internationally. … with real influence over architecture, standards and delivery. What you'll be doing: Owning backend architecture across core services Designing and maintaining scalable APIs (FastAPI) Building production-grade Python services (async where appropriate) Driving standards around testing, CI/CD, observability and performance Partnering closely with product, mobile ...

Lead Python Engineer | Python, FastAPI, Start-up | Remote, £90-105k I'm working with a well-funded, mission-driven healthtech company building innovative technology that makes healthcare more accessible and easier to use. They're scaling their engineering team as they expand their platform across the UK and internationally. … with real influence over architecture, standards and delivery. What you'll be doing: Owning backend architecture across core services Designing and maintaining scalable APIs (FastAPI) Building production-grade Python services (async where appropriate) Driving standards around testing, CI/CD, observability and performance Partnering closely with product, mobile ...

Lead Python Engineer | Python, FastAPI, Start-up | Remote, £90-105k I'm working with a well-funded, mission-driven healthtech company building innovative technology that makes healthcare more accessible and easier to use. They're scaling their engineering team as they expand their platform across the UK and internationally. … with real influence over architecture, standards and delivery. What you'll be doing: Owning backend architecture across core services Designing and maintaining scalable APIs (FastAPI) Building production-grade Python services (async where appropriate) Driving standards around testing, CI/CD, observability and performance Partnering closely with product, mobile ...

Lead Python Engineer | Python, FastAPI, Start-up | Remote, £90-105k I'm working with a well-funded, mission-driven healthtech company building innovative technology that makes healthcare more accessible and easier to use. They're scaling their engineering team as they expand their platform across the UK and internationally. … with real influence over architecture, standards and delivery. What you'll be doing: Owning backend architecture across core services Designing and maintaining scalable APIs (FastAPI) Building production-grade Python services (async where appropriate) Driving standards around testing, CI/CD, observability and performance Partnering closely with product, mobile ...

Lead Python Engineer | Python, FastAPI, Start-up | Remote, £90-105k I'm working with a well-funded, mission-driven healthtech company building innovative technology that makes healthcare more accessible and easier to use. They're scaling their engineering team as they expand their platform across the UK and internationally. … with real influence over architecture, standards and delivery. What you'll be doing: Owning backend architecture across core services Designing and maintaining scalable APIs (FastAPI) Building production-grade Python services (async where appropriate) Driving standards around testing, CI/CD, observability and performance Partnering closely with product, mobile ...

Lead Python Engineer | Python, FastAPI, Start-up | Remote, £90-105k I'm working with a well-funded, mission-driven healthtech company building innovative technology that makes healthcare more accessible and easier to use. They're scaling their engineering team as they expand their platform across the UK and internationally. … with real influence over architecture, standards and delivery. What you'll be doing: Owning backend architecture across core services Designing and maintaining scalable APIs (FastAPI) Building production-grade Python services (async where appropriate) Driving standards around testing, CI/CD, observability and performance Partnering closely with product, mobile ...

Lead Python Engineer | Python, FastAPI, Start-up | Remote, £90-105k I'm working with a well-funded, mission-driven healthtech company building innovative technology that makes healthcare more accessible and easier to use. They're scaling their engineering team as they expand their platform across the UK and internationally. … with real influence over architecture, standards and delivery. What you'll be doing: Owning backend architecture across core services Designing and maintaining scalable APIs (FastAPI) Building production-grade Python services (async where appropriate) Driving standards around testing, CI/CD, observability and performance Partnering closely with product, mobile ...

BACKEND ENGINEER - LONDON (WATERLOO, HYBRID) KEY POINTS Salary up to £75,000 Hybrid working - 3 days per week in Waterloo, London Python, FastAPI, PostgreSQL, AWS & Docker Building real-time AI solutions within the sports industry ABOUT THE CLIENT We're supporting a rapidly growing, AI-focused organisation operating within … time data systems Fast-paced, collaborative engineering environment THE BACKEND ENGINEER ROLE: You'll design, build, and maintain high-performance APIs using Python and FastAPI, working with large volumes of live sports data. The systems are real-time and data-heavy, so experience with asynchronous programming and scalable backend architecture ...