Senior Python Developer

Arcus Search; Greater London; Hybrid; GBP 136,000 - 178,000; Full time

Job summary

Arcus Search is partnering with a leading financial services organisation in London to recruit a Senior Python Developer. The role focuses on building a next-generation automation and orchestration platform for massive data scales across storage layers and geographic sites.

You will design robust data movement tooling, create self-service tools for non-technical users, and implement monitoring and observability dashboards while championing CI/CD best practices.

Qualifications

• Expert-level Python experience focused on large-scale systems.

Responsibilities

• Build and enhance a Python-based automation and orchestration platform.

Skills

Python

CI/CD

System design

Testing

Tools

Go

Rust

Airflow

Temporal

Prefect

CockroachDB

Job description

Senior Python Developer (Storage / Platform)

£850 per day (Inside IR35)

12-Month Contract (Highly Likely Extension)

London - Hybrid (3 /4 Days Onsite)

We are partnering with a highly regarded organisation operating within the financial sphere, seeking a Senior Python Developer to join a high-impact Storage Engineering team on a long-term contract.

This is a hands-on opportunity to play a key role in building critical infrastructure from the ground up, working at massive scale across hundreds of petabytes of data.

The Role

You will be instrumental in designing and delivering a next-generation automation and orchestration platform, replacing legacy tooling with a modern, centralised solution.

Key Responsibilities

• Build and enhance a Python-based automation and orchestration platform
• Develop robust data movement tooling across storage tiers and geographic sites
• Create intuitive self-service tools for non-technical users
• Implement monitoring, health checks, and observability dashboards
• Champion best practices across CI/CD, testing, and system design

Requirements

• Expert-level Python experience (focused on large-scale systems, not scripting)
• Strong background in CI/CD and scalable system architecture
• Proven ability to design and build clean, modular, maintainable systems
• Solid testing practices across unit, integration, and end-to-end levels

Desirable Experience

• Exposure to Go or Rust
• Experience with distributed SQL databases (e.g. CockroachDB)
• Familiarity with orchestration tools such as Airflow, Temporal, or Prefect
• Background working with large-scale data or storage platforms

This is an excellent opportunity to join a forward-thinking engineering environment tackling complex challenges at scale.