Senior Software Engineer

We are seeking an experienced Senior Software Engineer to join our engineering team in London. This is a hands-on, individual-contributor role for someone who has shipped production systems, made sound architectural decisions, and can communicate technical trade-offs clearly to both engineers and non-technical stakeholders.

The successful candidate will take ownership of systems across their full lifecycle( design, development, deployment, and ongoing support) and will play a key role in shaping engineering standards across the team.

Key Responsibilities

• Design and build backend services capable of handling production-scale traffic, with consideration for scalability, latency, and fault tolerance from the outset
• Write clean, well-tested code across our technology stack (primarily Python, Node.js, and Java)
• Conduct thorough code reviews, with attention to long-term maintainability rather than surface-level style
• Take ownership of key architectural decisions and present them clearly in design reviews
• Collaborate closely with Product teams to define realistic scope and timelines, providing technical input where requirements are not yet fully feasible
• Improve CI/CD pipelines, monitoring, and deployment processes on an ongoing basis
• Mentor mid-level and junior engineers through structured code review and pairing
• Diagnose and resolve production issues efficiently and calmly under pressure

• A minimum of 5 years’ experience building and shipping production software, including at least 2 years in a senior or technical leadership capacity
• Strong proficiency in at least one backend language (Python, Java, Go, or Node.js), with sound judgement in applying appropriate solutions
• Demonstrated experience with distributed systems, including message queues, caching layers, and databases operating at scale
• Practical experience with cloud infrastructure (AWS, GCP, or Azure), including an understanding of cost and reliability trade-offs
• Strong working knowledge of CI/CD practices and containerisation technologies (Docker, Kubernetes)
• Confident use of SQL, along with an understanding of when NoSQL solutions are more appropriate
• A demonstrated record of technical leadership, whether formal or informal
• Eligibility to work in the UK (please note we are unable to offer visa sponsorship for this role)

Desirable Skills

• Experience with event-driven architectures or message queue technologies (Kafka, RabbitMQ)
• Familiarity with infrastructure-as-code tools such as Terraform or Pulumi
• A portfolio of open-source contributions or technical writing

Pulled from the full job description Annual leave Sick pay Bereavement leave Life insurance Free parking Company pension Private medical insurance, * 25 days’ annual leave, plus bank holidays

• Private health insurance
• Employer pension contributions matched up to 5%
• Equity or share options (details available at interview stage)
• Dedicated budget for professional development, training, and conferences
• A collaborative engineering culture with a strong emphasis on shipping quality work regularly, * Bereavement leave
• Canteen
• Company pension
• Cycle to work scheme
• Free parking
• Life insurance
• On-site parking
• Sick pay