76 to 100 of 103 Permanent FastAPI Jobs

London | £80,000 - £150,000 | Python | React Location: London-based (hybrid) Salary: £80,000 - £150,000 + equity Tech Stack: Backend: Python (Flask or FastAPI or Django - ideally a blend of 2) Frontend: React, TypeScript Cloud Systems: GCP or AWS Are you a software engineer who enjoys shipping real products … impact without layers of process getting in the way. What you will be doing: Designing, building, and maintaining backend services and APIs using Flask & FastAPI Building and evolving user facing web components using React/TypeScript Integrating third party services and AI models into production workflows Investigating production issues ...

benchmark these systems rigorously to ensure they actually work, not just "feel" smart. Build the Backend Foundation: You will spend significant time in Python (FastAPI, SQLAlchemy) building the APIs, data structures, and services that power the product. You are an engineer who ensures the "AI" is delivered on reliable, production … Experience Production Engineering (5+ years): You are a strong software engineer first. You have extensive experience building and maintaining backend services in Python (ideally FastAPI or similar async frameworks) deployed to modern cloud providers (GCP/AWS) or point solutions (Railway, Render, Vercel) Applied AI Architecture: You have built complex ...

Engineer (Python, FastAPI/Django/Flask, Agentic AI Systems, LLM's, ML, Cloud Tech) London/Hybrid Remote Working (2 days per week) £40,000 - £65,000 D.O.E & Plus Benefits We are working with an established & growing global technology driven business who are looking for their latest star developer … delivery. You will be: An expert in Machine Learning concepts & LLM Developments Proficient in the use of Python. Experience in back end frameworks (FastAPI, Flask or Django) Ideally experienced in deploying AI Systems in cloud environments such as Azure, GCP or AWS Understanding of best practices. As part ...

workflows. What You’ll Do Build & 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 ...

make a real impact in the industry. What you'll do as the Full Stack Developer: Design and develop robust backend systems using Python (FastAPI or Flask). Build and integrate RESTful and GraphQL APIs . Develop React-based front-end components for a seamless user experience. Architect and deploy … Debug and troubleshoot issues to keep things running smoothly. What my client are looking for in their next Full Stack Developer: Proven Python experience (FastAPI or Flask preferred). React expertise -this is essential. Strong experience with AWS cloud services (EC2, Lambda, S3, DynamoDB, etc.). Solid understanding ...

where your work directly impacts the future of the product. Key Responsibilities Design and implement new backend endpoints and services using Django, Python, and FastAPI building on the existing codebase Build and maintain scalable REST APIs, integrating PostgreSQL for robust data management Lead the development of AI/LLM-powered … years of professional programming experience Strong proficiency in Python, with a proven track record of backend development Deep experience with Django and/or FastAPI , RESTful API design, and PostgreSQL Hands-on experience developing scalable systems and backend architectures Familiarity with Langchain, AI, or LLM tooling is a strong plus ...

benchmark these systems rigorously to ensure they actually work, not just "feel" smart. Build the Backend Foundation: You will spend significant time in Python (FastAPI, SQLAlchemy) building the APIs, data structures, and services that power the product. You are an engineer who ensures the "AI" is delivered on reliable, production … bring: Production Engineering (5+ years): You are a strong software engineer first. You have extensive experience building and maintaining backend services in Python (ideally FastAPI or similar async frameworks) deployed to modern cloud providers (GCP/AWS) or point solutions (Railway, Render, Vercel) Applied AI Architecture: You have built complex ...

benchmark these systems rigorously to ensure they actually work, not just "feel" smart. Build the Backend Foundation: You will spend significant time in Python (FastAPI, SQLAlchemy) building the APIs, data structures, and services that power the product. You are an engineer who ensures the "AI" is delivered on reliable, production … bring: Production Engineering (5+ years): You are a strong software engineer first. You have extensive experience building and maintaining backend services in Python (ideally FastAPI or similar async frameworks) deployed to modern cloud providers (GCP/AWS) or point solutions (Railway, Render, Vercel) Applied AI Architecture: You have built complex ...

benchmark these systems rigorously to ensure they actually work, not just "feel" smart. Build the Backend Foundation: You will spend significant time in Python (FastAPI, SQLAlchemy) building the APIs, data structures, and services that power the product. You are an engineer who ensures the "AI" is delivered on reliable, production … bring: Production Engineering (5+ years): You are a strong software engineer first. You have extensive experience building and maintaining backend services in Python (ideally FastAPI or similar async frameworks) deployed to modern cloud providers (GCP/AWS) or point solutions (Railway, Render, Vercel) Applied AI Architecture: You have built complex ...

benchmark these systems rigorously to ensure they actually work, not just "feel" smart. Build the Backend Foundation: You will spend significant time in Python (FastAPI, SQLAlchemy) building the APIs, data structures, and services that power the product. You are an engineer who ensures the "AI" is delivered on reliable, production … bring: Production Engineering (5+ years): You are a strong software engineer first. You have extensive experience building and maintaining backend services in Python (ideally FastAPI or similar async frameworks) deployed to modern cloud providers (GCP/AWS) or point solutions (Railway, Render, Vercel) Applied AI Architecture: You have built complex ...

benchmark these systems rigorously to ensure they actually work, not just "feel" smart. Build the Backend Foundation: You will spend significant time in Python (FastAPI, SQLAlchemy) building the APIs, data structures, and services that power the product. You are an engineer who ensures the "AI" is delivered on reliable, production … bring: Production Engineering (5+ years): You are a strong software engineer first. You have extensive experience building and maintaining backend services in Python (ideally FastAPI or similar async frameworks) deployed to modern cloud providers (GCP/AWS) or point solutions (Railway, Render, Vercel) Applied AI Architecture: You have built complex ...

e.g., Census, Hightouch) or building custom syncs to HubSpot, Slack, APIs Responsibilities: AI & Application Engineering • Architect and deploy AI-powered systems into production (e.g., FastAPI apps with RAG architecture using OpenSearch and Langfuse) • Optimize agentic workflows, prompt & embedding pipelines, and retrieval quality through experimentation and tracing • Extend LLM capabilities with … high-performing Data & AI team. Help hire, mentor, and establish best practices as we grow Technologies: AI AWS Architect Azure Cloud ETL FastAPI GCP IAM Support LLM Looker Power BI Python SQL Slack Terraform dbt More: Welcome We are looking for a senior-level engineer to take full ownership ...

cost/safety guardrails). Essential Requirements 3-6+ years building production backends/services , with shipped work and clear ownership. Strong Python (FastAPI) and database skills ( PostgreSQL/MongoDB ); solid API design fundamentals. Familiarity with AWS serverless patterns and Docker for bespoke services; basic CI/CD concepts. … 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. Datastores: PostgreSQL, MongoDB (as appropriate), Redis (caching/sessions). Vectors/Embeddings: Chroma (or similar). AI Models & APIs: Claude (Anthropic), Gemini (Google ...

part of a team that's pushing boundaries. What you'll do Design, build, and optimize high-performance Back End systems in Python and FastAPI Develop and maintain Back End systems that handle large volumes of Real Time data Write clean, testable, and maintainable code following best practices Contribute … collaborative, fast-moving environment What we're looking for Strong professional experience with Python Solid experience building RESTful APIs with FastAPI (or similar frameworks like Flask/Django) Passion for performance, scalability, and automation Experience or interest in AI A proactive mindset - someone who loves solving problems and experimenting with ...

Python Developer | Python & FastAPI | Founding Engineer in High-Growth AI Venture Studio Contract | £400/day | Outside IR35 The Role You’ll step in as a Founding Engineer within an early-stage AI venture studio that builds and launches creator-led B2C software businesses at speed. This is a backend … factory. You’re comfortable building things that don’t yet have perfect answers. What You’ll Work With Python development at a high level FastAPI or adjacent Python backend frameworks API design and backend architecture fundamentals PostgreSQL and/or MongoDB React or React Native for frontend collaboration AWS serverless ...

flows, while also contributing to the frontend where needed. What you’ll do Design and build backend services and APIs in Python, typically using FastAPI or similar frameworks Build and maintain frontend features using React and Next.js Own data models, background workers, async processing, and system behaviour Work with relational … Collaborate closely with other engineers to ship production features quickly and safely How the stack looks in practice Python for backend services and APIs FastAPI or similar modern Python frameworks React with Next.js on the frontend Relational databases with Redis for caching and background jobs Async processing and worker based ...

scroll, or back out. Production Integration: Ensure this new engine isn't a silo. It needs to speak fluently to our existing FastAPI/Django backend and stream results to the Next.js dashboard in real-time. The Tech Stack Current platform stack (whats already live) Python 3.11, Django (DRF), FastAPI ...

Technical Lead | Product Technical Lead | Tech Lead | Product Manager | AI/Data Science | Python | FastAPI | SaaS | Hybrid 2 days a week | Central London | £85,000 + 15% bonus I am currently working with a brilliant consultancy with deep expertise in their field of Data and Cyber Security solutions, predominantly with … fullest. Key skills Strong software engineering skills, delivering end-to-end software products. Highly product orientated. Highly skilled in Python development, with knowledge of FastAPI framework. Good databases knowledge with schema design and SQL. Some front-end development preferably TypeScript & React is highly desirable. Experience of designing scalable systems ...

Founding BE Engineer (Python, FastAPI) Salary up to £85,000 +Equity London - 3 days a week Early stage MedTech Startup, building tools that help design better, fairer, and more effective clinical trials. Their work sits at the intersection of data, science, and human decision-making, which have a direct impact … direct impact on shaping the product and overall feel of the platform and useability. Design and build core back-end services in Python (FastAPI) Produce prototypes, including data ingestion pipelines, embedding workflows, and recommendation components Develop high-performance APIs supporting semantic search, clustering insights, and protocol-generation features Deploy, operate ...

features used by enterprise customers. Develop modern, responsive interfaces using React/Next.js . Design and optimize APIs, data pipelines, and integrations using Python (FastAPI/Django) . Collaborate with design, product, and AI teams to deliver new functionality quickly and reliably. Contribute to architectural decisions, system scalability, and engineering … Looking For: Proven experience as a Full-Stack Engineer in a startup or fast-paced environment. Strong proficiency in React/Next.js and Python (FastAPI/Django) . Experience shipping scalable, production-grade software. Exposure to or interest in AI/ML-driven products . Startup experience or comfort with ...

mobile apps (iOS and Android), with support to learn Swift and Kotlin on the job. Integration: Connecting front-end interfaces with our Django/FastAPI backend. Requirements Essential: Strong proficiency in React and Next.js. Experience with data visualisation libraries (D3.js, Chart.js, Recharts, or similar). Experience with map libraries (Mapbox … . Nice to Have: Experience with Swift (iOS) or Kotlin (Android) is a massive plus, but not required. Familiarity with Python web frameworks (Django, FastAPI, or Flask). Experience with Docker or OpenStreetMap tooling. Any degree (subject doesn't matter). What We're Looking For Open on Experience: Whether ...

user-facing features and reporting. Continuously improve reliability, performance, deployment, and monitoring as the platform scales. What We're Looking For: Tech Stack: Backend: FastAPI, Airflow Databases: PostgreSQL, MongoDB Messaging & Streaming: Kafka Ideal Experience: 5+ years' experience building and maintaining mission-critical backend systems. Strong background in microservices-based architectures. … annual leave. If you are interested in the above role, click the 'Apply Now' button for immediate review. Senior Backend Engineer, Backend Engineer, Python, FastAPI, Kafka, Airflow, PostgreSQL, MongoDB, Microservices, Event-Driven Architecture, Cybersecurity, SaaS Circle Recruitment is acting as an Employment Agency in relation to this vacancy. Earn yourself ...

Senior Backend Engineer – High-Scale Systems | Python & FastAPI | Security SaaS Salary: £75k - £85k plus bonus Location: Fully remote, (UK-based) Sponsorship is not available for this role Prism Digital have partnered with a super interesting and niche VC-backed client specialising in attack surface management and automated red teaming. Their … messaging queues e.g., Kafka (nice to have) This is entirely a Python back-end development role (Python 3), where the core framework used is FastAPI and Kafka for the messaging queues. The data sits in PostreSQL and MongoDB. Benefits Up to £85,000 Fully remote 28-day holidays (including bank ...

Founding FullStack Engineer (VueJS/React, TypeScript,Python, FastAPI) Salary up to £95,000 +Equity London - 3 days a week Early stage MedTech Startup, building tools that help design better, fairer, and more effective clinical trials. Their work sits at the intersection of data, science, and human decision-making, which … direct impact on shaping the product and overall feel of the platform and useability. Design and build back-end services and APIs in Python (FastAPI) that power the core platform Develop front-end components in Vue.js , turning complex data and AI outputs into intuitive user experiences Own features ...

understand the trade-offs between speed, cost, and model performance. Design, implement, and productionise multi-agent LLM systems that reason, plan, and coordinate. Develop FastAPI-based microservices optimised for low latency and high reliability. Engineer and evaluate RAG pipelines : hybrid retrieval, re-ranking, grounding, and context validation. Integrate real-time … model-faithfulness metrics. What we’re looking for Proven ability to build and ship agentic or multi-agent frameworks into production. Expert Python, FastAPI, and asyncio developer. Practical experience with LangChain, Autogen, or custom orchestration layers . Startup mindset: ownership, speed, and pragmatism over perfection. Bonus points Experience working with ...