Senior Software Engineer – Build, Lead, and Scale Impactful Systems

Tech Stack - Python, AWS, SQL, Terraform

We’re partnering with an exciting, fast-growing technology business that’s tackling complex, real-world challenges with cutting-edge engineering.

They’re now looking for a Senior Engineer (IC3) to play a key role in designing and delivering high-impact, cross-service features within a modern, distributed platform.

What you’ll be doing:

• Leading the design and delivery of complex, scalable systems across multiple services
• Making pragmatic architectural decisions in a fast-moving environment
• Driving engineering excellence across testing, security, and observability
• Owning services in production – improving reliability, performance, and resilience
• Mentoring engineers and elevating team capability
• Collaborating cross-functionally with Product, Data, and Design

What they’re looking for:

• Strong experience designing scalable, maintainable systems with clear ownership boundaries
• Proven ability to lead delivery across ambiguous, complex problem spaces
• Deep understanding of reliability, observability, and production systems
• A security-first mindset with experience mitigating risks and vulnerabilities
• Excellent communication skills with the ability to influence and mentor
• Python Experience is preferred - though experience with similar languages are a plus e.g. Clojure, Rust, Kotlin, Scala, Golang.
• AWS Experience (Hands-on work with GCP/Azure is okay too)
• BSc in Computer Science

Why this role stands out:

• High ownership and autonomy in shaping technical direction
• Opportunity to work on meaningful, technically challenging problems
• A strong engineering culture focused on quality, delivery, and continuous improvement
• Clear impact on product performance, scalability, and team growth

Location: London - Hybrid (2 days per week on-site)

Salary: Up to £110,000

Type: Permanent, Full-Time