Co-Founder @ Digital Waffle - The go-to partner when scaling your team within Tech, Digital, Marketing & Data - without the usual bullsh*t.

A growing SaaS business is hiring a Senior Software Engineer to lead the technical rebuild of its flagship product. This is a hands‑on role for an experienced engineer who loves modernising legacy systems and is excited about using AI tools to accelerate design, refactoring, and delivery.

Role: Senior Software Engineer (AI-Enabled Refactor)

Salary: Up to £70,000 per annum (flexible for exceptional candidates)

Location: Hybrid – London office once per fortnight, remote within the UK

What you’ll be doing:

• Lead the refactor of a large legacy system into a modern, scalable cloud‑native product
• Design and implement new architecture using AWS microservices, PostgreSQL, Node.js, React, and TypeScript
• Use AI‑assisted tools such as OpenAI, LangChain, Claude, or Hugging Face to enhance efficiency, code quality, and testing
• Establish clean engineering practices, including CI/CD, automation, and testing frameworks
• Work closely with product and technical leadership to translate business requirements into technical outcomes
• Mentor a junior developer and help shape future engineering capability

What you’ll need:

• 7+ years’ experience building or refactoring large‑scale applications (ERP or SaaS experience ideal)
• Strong technical background with Python, TypeScript, React, Node.js, PostgreSQL, and AWS
• Proven experience in greenfield development and system modernisation
• Interest or hands‑on experience with AI‑driven development tools
• Solid understanding of clean architecture, automation, and modern DevOps practices
• A collaborative mindset and enthusiasm for innovation

What’s on offer:

• Salary up to £70,000 per annum (flexible for the right person)
• Hybrid working – typically remote with occasional team days in London
• Opportunity to lead a full‑scale rebuild project from the ground up
• Freedom to experiment with AI technologies that accelerate development
• Startup‑style autonomy backed by the stability of a well‑funded organisation

If you’re a senior engineer who enjoys modernisation projects and wants to work at the intersection of AI and large‑scale software engineering, this is an opportunity to build something that defines the next generation of a leading SaaS platform.