Senior Backend Software Engineer Python

Client Server; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Equity

Pension

Hybrid working

Job summary

Client Server is seeking a Senior Backend Software Engineer to own the orchestration engine in a Python/AWS stack. You will design for scalable workloads, build the AI-native data layer, and collaborate directly with customers to solve real problems.

Based in London with hybrid work, you’ll contribute across the full development lifecycle, write Terraform, monitor production, and help shape engineering standards as part of a small, ambitious team.

Qualifications

• Advanced backend Python coding skills including FastAPI.
• Good understanding of system architecture, design and scalability.
• Experience with distributed systems.
• Familiar with AWS, IaC (Terraform), Docker, PostgreSQL, DynamoDB, CI/CD, GitHub Actions.

Responsibilities

• Own the orchestration engine that controls scheduling, execution, state, retries, concurrency and cancellation using Python and AWS.
• Write Terraform and manage infrastructure end-to-end; monitor production and resolve issues.
• Contribute to product roadmap and shape engineering standards, culture and ways of working.

Skills

Python

FastAPI

Distributed systems

System architecture

Tools

AWS

Terraform

Docker

PostgreSQL

DynamoDB

CI/CD

GitHub Actions

Blacksmith runners

Job description

Senior Backend Software Engineer / Developer (Python) London / WFH to £120k

Are you a technologist with start-up experience looking for your next opportunity?

You could be progressing your career at a tech start-up that is producing an AI native data pipelining platform.

As a Senior Backend Software, you'll own the orchestration engine that controls scheduling, execution, state, retries, concurrency and cancellation, using Python, FastAPI and AWS in a high velocity production environment. You'll design for unpredictable workloads, solving challenges around capacity, back pressure and isolation, while building the AI native layer that will underpin the next generation of the product.

You'll own your infrastructure end-to-end, writing Terraform, monitoring what you ship and resolving issues in production. Working across the full development lifecycle, you'll take features from idea through to production, collaborate directly with customers to solve complex real-world problems and use your technical insight to influence the product roadmap. As part of a small, ambitious engineering team, you'll also have a genuine opportunity to shape engineering standards, culture and ways of working.

Location / WFH:

You will join colleagues in the London office (close to Waterloo) with flexibility to work from home twice a week.

About you:

• You have advanced backend Python coding skills, including FastAPI
• You have a good understanding of system architecture, design and scalability
• You have experience of working on distributed systems
• You're familiar with other technology in the stack including: AWS, IaC using Terraform, Docker, PostgreSQL, DynamoDB, CI/CD, GitHub actions, Blacksmith runners
• You're collaborative and pragmatic with great communication skills, keen to input into technical discussion and decision making

What's in it for you:

• Salary to £120k
• Equity
• Impactful role with excellent career progression as the company scales
• Hybrid working
• Pension