Backend Engineer, Contractor | Python, FastAPI, Kubernetes, AWS | High-Throughput Data & API Platform, Scale-up | £575-725/day Outside IR35 | 6 Months+ | Hybrid, London or UK Remote

Backend Engineer, Contractor | Python, FastAPI, Kubernetes, AWS | High-Throughput Data & API Platform, Scale-up | £575-725/day Outside IR35 | 6 Months+ | Hybrid, London or UK Remote

Posted Today by Owen Thomas | Pending B Corp™

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£725 Per day
Outside
Hybrid
United Kingdom
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Amazon Simple Notification Service (SNS) Amazon Simple Queue Services Amazon Web Services (AWS) Application Programming Interface (API) Artificial Intelligence Azure Kubernetes Service Backbone.js C++ (Programming Language) Cloud Computing Cloud Technology Containerisation Continuous Integration and Continuous Delivery DevOps Docker (Software) FastAPI Infrastructure as Code (IaC) Kubernetes Machine Learning PostgreSQL Python (Programming Language) Redis Rust (Programming Language) Scalability Terraform

Summary: The Backend Engineer role involves designing and building high-performance Python services using FastAPI for a rapidly scaling AI infrastructure company. The position focuses on creating robust APIs, optimizing cloud workloads, and ensuring reliability under heavy load, with a strong emphasis on collaboration with various teams. This is a contractor position offering a hybrid working arrangement in London or UK remote. The role is outside IR35 and has a duration of 6 months or more.

Key Responsibilities:

  • Designing and building internal & public APIs in Python (FastAPI) for high-throughput environments
  • Architecting services with reliability and scalability as core principles
  • Deploying containerised workloads in AWS via Kubernetes and Terraform
  • Collaborating closely with DevOps, ML, and product teams to integrate backend services into complex data ecosystems
  • Owning your code from design to production, including monitoring, logging, and on-call rotation

Key Skills:

  • Strong backend experience with Python and frameworks like FastAPI or Django
  • Deep AWS knowledge, especially around containerisation (Docker) and orchestration (Kubernetes)
  • API design skills for both internal and external consumption
  • Database skills with PostgreSQL, Redis, and/or other distributed stores
  • Comfort with IaC (Terraform) and CI/CD pipelines
  • Experience with other Backend languages like Go, Rust, C++ are beneficial

Salary (Rate): £725/day

City: London

Country: United Kingdom

Working Arrangements: hybrid

IR35 Status: outside IR35

Seniority Level: undetermined

Industry: IT

Detailed Description From Employer:

Backend Engineer, Contractor | Python, FastAPI, Kubernetes, AWS | High-Throughput Data & API Platform, Scale-up | £575-725/day Outside IR35 | 6 Months+ | Hybrid, London or UK Remote

Opportunity: We’re partnering with a rapidly scaling AI infrastructure company, building the backend systems that power complex data pipelines and real-time APIs for global clients. You’ll work on the backbone of their platform - engineering high-performance Python services with FastAPI, integrating deeply with Kubernetes-native infrastructure, and deploying at scale in AWS. This is a backend-first role where you’ll design robust APIs, optimise cloud workloads, and ensure the platform runs reliably under heavy load.

What You’ll Be Doing for this Backend Engineer, Contractor | Python, FastAPI, Kubernetes, AWS | High-Throughput Data & API Platform, Scale-up | £575-725/day Outside IR35 | 6 Months+ | Hybrid, London or UK Remote

  • Designing and building internal & public APIs in Python (FastAPI) for high-throughput environments
  • Architecting services with reliability and scalability as core principles
  • Deploying containerised workloads in AWS via Kubernetes and Terraform
  • Collaborating closely with DevOps, ML, and product teams to integrate backend services into complex data ecosystems
  • Owning your code from design to production, including monitoring, logging, and on-call rotation

Core Skills We’re Looking For in this Backend Engineer, Contractor | Python, FastAPI, Kubernetes, AWS | High-Throughput Data & API Platform, Scale-up | £575-725/day Outside IR35 | 6 Months+ | Hybrid, London or UK Remote

  • Strong backend experience with Python and frameworks like FastAPI or Django
  • Deep AWS knowledge, especially around containerisation (Docker) and orchestration (Kubernetes)
  • API design skills for both internal and external consumption
  • Database skills with PostgreSQL, Redis, and/or other distributed stores
  • Comfort with IaC (Terraform) and CI/CD pipelines
  • Experience with other Backend languages like Go, Rust, C++ are beneficial

Bonus Points For:

  • Previous work on backend infrastructure for AI/ML or data-intensive platforms
  • Event-driven architecture experience (Kafka, SQS, SNS)
  • Startup or scaleup experience in high-availability environments

The Details For This Backend Engineer, Contractor | Python, FastAPI, Kubernetes, AWS | High-Throughput Data & API Platform, Scale-up | £575-725/day Outside IR35 | 6 Months+ | Hybrid, London or UK Remote:

  • Rate: £575–725/day Outside IR35
  • Duration: 6 months+, likely extensions
  • Location: Hybrid (London 2–3 days/week) or UK Remote
  • Start: ASAP

If you want to build backend services that form the foundation of next-generation AI and data platforms, we’d love to hear from you. Apply now and WE will be in touch quickly if it’s a good match.

Backend Engineer, Contractor | Python, FastAPI, Kubernetes, AWS | High-Throughput Data & API Platform, Scale-up | £575–725/day Outside IR35 | 6 Months+, likely extensions | Hybrid (London) or UK Remote

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