Principal Software Engineer

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Build modern products. Not legacy patches.

We’re hiring a Principal Software Engineer to help shape and scale high-performance web applications using Next.js and React.

This isn’t a maintenance role.

This isn’t a ticket factory.

You’ll have real ownership. Real technical input. Real impact.

What You’ll Be Doing

  • Designing and building scalable applications with Next.js & React
  • Writing clean, maintainable TypeScript
  • Improving and maintaining CI/CD pipelines using GitHub Actions
  • Driving performance optimisation and best practices
  • Contributing to architectural decisions
  • Mentoring engineers and raising the technical bar

What We’re Looking For

Strong commercial experience with React & Next.js

Experience shipping production-scale applications

CI/CD experience (GitHub Actions preferred)

Strong Git workflow and code review habits

Clear communicator who can collaborate cross-functionally

Nice to have:

  • Core Web Vitals optimisation
  • Experience in product-led or scaling environments

Why Join?

  • Modern stack
  • Hybrid working (Hammersmith base)
  • Real ownership and autonomy
  • Engineering-led culture
  • £100k to £110k salary band

If you’re a senior engineer who wants to influence architecture, improve systems, and work in a team that values quality — let’s talk.

#J-18808-Ljbffr”, “datePosted”: “2026-05-17”, “hiringOrganization”: { “@type”: “Organization”, “name”: “Accelero”, “sameAs”: “https://uk.whatjobs.com/pub_api__cpl__434437966__4861?utm_campaign=publisher&utm_medium=api&utm_source=4861&geoID=33” }, “jobLocation”: { “@type”: “Place”, “address”: { “@type”: “PostalAddress”, “addressLocality”: “London” } } }
Company: Accelero
Apply for the Principal Software Engineer
Location: London
Job Description:

Build modern products. Not legacy patches.

We’re hiring a Principal Software Engineer to help shape and scale high-performance web applications using Next.js and React.

This isn’t a maintenance role.

This isn’t a ticket factory.

You’ll have real ownership. Real technical input. Real impact.

What You’ll Be Doing

  • Designing and building scalable applications with Next.js & React
  • Writing clean, maintainable TypeScript
  • Improving and maintaining CI/CD pipelines using GitHub Actions
  • Driving performance optimisation and best practices
  • Contributing to architectural decisions
  • Mentoring engineers and raising the technical bar

What We’re Looking For

Strong commercial experience with React & Next.js

Experience shipping production-scale applications

CI/CD experience (GitHub Actions preferred)

Strong Git workflow and code review habits

Clear communicator who can collaborate cross-functionally

Nice to have:

  • Core Web Vitals optimisation
  • Experience in product-led or scaling environments

Why Join?

  • Modern stack
  • Hybrid working (Hammersmith base)
  • Real ownership and autonomy
  • Engineering-led culture
  • £100k to £110k salary band

If you’re a senior engineer who wants to influence architecture, improve systems, and work in a team that values quality — let’s talk.

#J-18808-Ljbffr…

Posted: May 17th, 2026