Senior Software Engineer

Job Title: Senior Software Engineer

Location: Cardiff (1 day a week in the office)
Salary: £65,000 + pension + bonus
Hours: 35-hour week, flexible around life

Real AI. In production.

Not just boilerplate generation or internal demos but automation, data grading, and defect detection built into live systems used by global financial clients.

This is a hands-on senior engineering role for someone who wants to stay close to the code, solve meaningful problems, and work with genuinely modern tech — from AWS microservices to AI-driven data pipelines that make the platform smarter every week.

The challenge

The platform has been rebuilt into hundreds of AWS services and is now evolving from serverless to an always-on architecture that supports 24/7 global customers and faster response times.

Youll join a small, experienced team where quality matters more than velocity — helping shape standards, tools, and direction while building systems that are reliable, scalable, and intelligent.

Job Responsibilities

• Building and maintaining AWS-based microservices (Node)
• Developing new AI-powered and data-driven features
• Optimising always-on services for latency, reliability, and performance
• Working on React components, authentication, and SSO
• Collaborating across backend, frontend, data, and security disciplines

Tech environment

• Typescript, Node, React, Python
• AWS (Lambda, EC2, S3, CloudFormation, Bedrock)
• DynamoDB / SQL
• Event-driven architecture, CI/CD pipelines
• Automated testing (Cypress / Playwright)
• Exposure to GenAI tooling and AWS Bedrock integrations

Experience needed

• Proven experience as a Senior Engineer or a strong Mid ready to step up
• Solid knowledge of at least one core language
• Experience with serverless architecture in AWS or Azure
• An engineering mindset focused on problem-solving and clean design
• Curiosity about how AI can make systems smarter, not just faster

Why this role

• Real AI in production, not just theory or proof-of-concepts
• A mature development environment that values doing things properly
• Broad exposure across architecture, data, and automation
• Freedom to influence how systems are designed and built
• Supportive, experienced leadership — no politics, no burnout

The offer

• 1 day a week in Cardiff (plus occasional townhalls/product kick-offs)
• Flexible working, proper kit, and real balance
• The chance to build, learn, and improve systems every week
• This isnt a fast track to Principal, and thats the point!

If youre happiest when youre coding, experimenting, and seeing the impact of what you build, this team will feel like home.