Senior Platform Engineer - Developer Experience

Responsibilities

• ▹Build and maintain internal tools, services, APIs, and command-line applications
• ▹Improve workflows across coding, testing, code review, deployment, and production operations
• ▹Create service templates and paved roads for secure, observable, and reliable software
• ▹Improve the speed, reliability, and usability of CI/CD systems
• ▹Develop reusable platform capabilities consumed via self-service
• ▹Help engineers use observability effectively, with good defaults for logs, metrics, traces, and SLIs
• ▹Work directly with engineers to understand friction, test ideas, and support adoption
• ▹Use feedback and workflow data to measure whether changes improved the developer experience
• ▹Contribute production-quality code, tests, documentation, and operational support

Requirements

• ▹Strong software engineering experience designing, building, testing, and operating production software
• ▹Proficiency in at least one modern programming language
• ▹Practical experience improving how software is built, tested, deployed, or operated
• ▹Strong opinions about effective software development, while remaining pragmatic
• ▹Ability to design maintainable systems and make sensible trade-offs between speed, quality, and complexity
• ▹Experience with CI/CD, containers, and cloud infrastructure
• ▹Enjoys building tools and platforms for other engineers
• ▹Product mindset for internal tooling: understanding user needs, validating solutions, measuring adoption
• ▹Ability to independently own a problem from discovery through to delivery and adoption
• ▹Clear communication through code, documentation, and technical discussions

Nice to have

• ▹AWS and infrastructure as code (Terraform)
• ▹Building internal developer platforms, developer portals, CLIs, or service templates
• ▹Observability using tools such as OpenTelemetry, CloudWatch, or SigNoz
• ▹Reliability engineering, incident response, or production operations
• ▹Experience in fintech or another regulated environment

Soft skills

What we offer

• ▹Competitive salary, benchmarked at the top of the market
• ▹Pension (minimum 4% contribution, matched up to 7%)
• ▹Private medical insurance
• ▹Paid sick leave with income protection for long-term illness
• ▹Group life assurance
• ▹Season ticket loan and Cycle to Work scheme
• ▹25 days holiday plus local public holidays (exchangeable)
• ▹Hybrid working model
• ▹Ability to work abroad up to 3 months a year
• ▹1 month paid sabbatical after 5 years of service
• ▹Enhanced parental leave and flexible working arrangements
• ▹Professional learning and development budget
• ▹Quarterly team socials, summer and winter company events

About the company

9fin is the AI platform powering global debt markets — a $145 trillion asset class — centralizing proprietary credit data, analysis, and workflows for 300+ blue-chip institutions worldwide, including banks, asset managers, private equity firms, and law firms.