Senior Software Engineer (Python)

A software company in London is looking for a Senior Developer to join their engineering team. They operate in a fast-paced environment where engineers prioritise quick delivery, practical problem-solving, and real-world impact over perfect code. It’s an outcome-driven culture with plenty of autonomy, where developers take ownership across the full lifecycle of their work.

What You’ll Work On

• Building integrations with new data and liquidity sources using advanced web-scraping and reverse-engineering techniques.
• Developing and maintaining low-latency, real-time data feeds to support internal strategies.
• Improving system visibility and observability to help identify integration issues and areas for optimisation.
• Working as part of an agile team with a flexible, evolving roadmap driven by new information and opportunities.
• Taking full responsibility for software from design through to development, testing, review, deployment, and production support.

Key Responsibilities

• Design & Deliver Features: Build features aligned with business goals, writing high-quality, maintainable, and performant code.
• Code Quality: Review and test contributions from peers to ensure functionality, maintainability, and performance standards.
• Production Ownership: Support services in production, ensuring stability and responding quickly to issues.
• Cross-Team Collaboration: Work closely with fellow engineering teams, as well as internal stakeholders, to design and deliver effective technical solutions.
• Out-of-hours support as part of a rotating schedule.
• Languages: Python
• Observability: OpenTelemetry, Prometheus, Grafana, Zabbix
• Cloud: AWS

Requirements

Must-haves

• Strong software development background with solid Python experience.
• Degree in Computer Science or a similar numerical subject.
• Excellent communication skills with the ability to explain complex ideas clearly.
• Strong decision-making skills, particularly around trade-offs in architecture and implementation.
• Experience with web-scraping / reverse-engineering, including navigating bot-protection tooling.

Nice-to-haves

• Experience building event-driven systems.
• Comfortable working in Linux/Unix environments.
• Experience contributing to cloud migration projects (AWS ideal).
• Competitive salary with strong bonus potential.
• Enhanced pension contributions.
• Private health insurance and life assurance.
• Sabbatical option after five years.
• 33 days’ annual leave (including bank holidays).
• The chance to work on high-impact systems in a technically demanding environment, contributing directly to business performance and future growth.

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