Senior Platform Engineer – Developer Experience

Jobtailor; Greater London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid working model

Private Medical Insurance

Pension

Season Ticket Loan

Cycle to Work

25 holiday days + public holidays

Sabbatical after 5 years

Job summary

9fin is seeking a Senior Developer Experience Engineer to accelerate software development across the lifecycle, from new services to deployment and production operations. You will join the Platform team and collaborate with engineers to remove friction and raise quality.

You will build and maintain internal tools, templates, and paved roads that enable self-service for product teams, improve CI/CD, and enhance observability with logs, metrics, and traces.

Qualifications

• Strong software engineer with production experience.
• Experience designing, building, testing and operating production software.
• Proficient in modern programming languages and fundamentals.
• Experience with CI/CD, containers and cloud infrastructure.

Responsibilities

• Building and maintaining internal tools, services, APIs and command‑line applications.
• Improving workflows across coding, testing, code review, deployment and production operations.
• Creating service templates and paved roads that make it easier to build secure, observable and reliable software.
• Improving the speed, reliability and usability of our CI/CD systems.
• Developing reusable platform capabilities that product engineers can consume through self‑service.
• Helping engineers use observability effectively, with good defaults for logs, metrics, traces and service‑level indicators.
• Working directly with engineers to understand friction, test ideas and support adoption.
• Using feedback and workflow data to measure whether changes have improved the developer experience.
• Contributing production‑quality code, tests, documentation and operational support.

Skills

Software engineering

CI/CD

Cloud infrastructure

Observability

Tooling development

Self-service platforms

Tools

AWS

Terraform

OpenTelemetry

CloudWatch

SigNoz

Kubernetes

Job description

Job Overview

Senior Developer Experience Engineer – help make software development at 9fin faster, simpler and safer.This role focuses on the tools, systems and paved roads that other engineers use. You will work across the software development lifecycle, from creating a new service through to testing, deployment, observability and operating it in production.You will join an established Platform team and work alongside our existing Developer Experience Engineer. Your customers are 9fin’s software engineers, and you will have the autonomy to solve problems that help them build products quickly, securely and to a high standard of quality.

What you’ll work on

• Building and maintaining internal tools, services, APIs and command‑line applications.
• Improving workflows across coding, testing, code review, deployment and production operations.
• Creating service templates and paved roads that make it easier to build secure, observable and reliable software.
• Improving the speed, reliability and usability of our CI/CD systems.
• Developing reusable platform capabilities that product engineers can consume through self‑service.
• Helping engineers use observability effectively, with good defaults for logs, metrics, traces and service‑level indicators.
• Working directly with engineers to understand friction, test ideas and support adoption.
• Using feedback and workflow data to measure whether changes have improved the developer experience.
• Contributing production‑quality code, tests, documentation and operational support.

About you

• Strong software engineer with experience designing, building, testing and operating production software.
• Proficient in at least one modern programming language – engineering fundamentals are more important than any particular language.
• Understanding of the software development lifecycle and practical experience improving how software is built, tested, deployed or operated.
• Strong opinions about what makes software development effective, but pragmatic about different teams and contexts.
• Ability to design maintainable systems and make sensible trade‑offs between speed, quality and complexity.
• Experience with CI/CD, containers and cloud infrastructure.
• Enjoy building tools and platforms for other engineers.
• Product approach to internal tooling: understanding user needs, validating solutions and measuring adoption.
• Ability to own a problem from discovery through to delivery and adoption.
• Clear communication through code, documentation and technical discussions.
• Real appetite for learning and self‑improvement.

Nice to haves

• AWS and infrastructure‑as‑code (Terraform).
• Building internal developer platforms, 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.

Benefits

• Competitive Salary – our salary bands are benchmarked at the top end of the market.
• Pension – minimum contributions 4% with 9fin matching up to 7%.
• Private Medical Insurance.
• Paid sick leave with Income Protection for long periods of illness.
• Group Life Assurance.
• Season Ticket Loan & Cycle to Work schemes.
• 25 holiday days per year + local public holidays (with ability to exchange).
• Hybrid working model for flexibility.
• Work abroad for up to 3 months a year.
• One month paid sabbatical after 5 years of service.
• Enhanced parental leave & flexible working arrangements.
• Professional learning and development budget.
• Quarterly team socials and summer/winter company events.

Equal Opportunity

9fin is an equal opportunities employer. We are dedicated to building and promoting a fair and inclusive workplace where everyone can reach their full potential and truly belong. We recognize that building diverse teams enables a more creative and productive environment.