Principal Software Engineer

Mexa Solutions LTD; Portsmouth; Hybrid; GBP 90,000 - 100,000; Full time

Job summary

Mexa Solutions LTD is seeking a Principal Software Engineer to own end-to-end development of a growing SaaS product suite with a strong emphasis on AI tooling and delivering commercial impact.

In this role you’ll work across product discovery, architecture and implementation, writing hands-on code while guiding architectural decisions in a mature CI/CD environment.

Qualifications

• Experience across all areas of full stack development and ideally in large scale SaaS platforms.
• Strong knowledge and experience in TypeScript.
• Other technical knowledge includes NodeJS, SQL and AWS.
• Forward thinking approach to producing quality software development and utilising AI.
• Experience of working in mature CI/CD environments and following DevSecOps methodologies.

Responsibilities

• Owns end-to-end ownership of projects from product discovery and architecture through to implementation.
• Hands-on development with a focus on AI tooling and commercial impact.
• Contribute to strategic conversations and bring creative ideas for the bigger picture.

Skills

TypeScript

NodeJS

SQL

AWS

CI/CD

DevSecOps

Full stack development

AI tooling

Job description

Own projects, embrace AI and make a commercial impact on a growing SaaS product suite...

Principal Software Engineer

£90 – 100k basic

Hybrid – must be commutable to Portsmouth once a month

Your new opportunity…

A key member of the Software Development team, you’ll be working on a growing SaaS product suite with clear commercial impact — features you build can materially move revenue.

As the Principal Software Engineer, you'll have hands‑on end‑to‑end ownership of projects, from product discovery and architecture through to implementation. There is heavy adoption of AI tooling (agentic AI) in the team and there's an opportunity to upskill on cutting edge developer workflows.

You’ll also be involved in the important, strategic conversations and will bring your creative thinking and ideas to the table, always looking at the bigger picture and what’s next.

Your new organisation…

You’ll be joining a global SaaS technology organisation that is the market leader in their sector. They are passionate about software and technology and are continually striving to be better and stay clear of their competitors.

Although extremely well established with a huge customer base, they are continuing to grow and develop new products whilst embracing AI and its capabilities.

What you’ll bring…

As a well established Principal Software Engineer, you’ll have both a technical and commercial mindset when it comes to designing and building systems.

Other skills and knowledge you’ll bring:

• Experience across all areas of full stack development and ideally in large scale SaaS platforms.
• Strong knowledge and experience in TypeScript.
• Other technical knowledge required includes NodeJS, SQL and AWS.
• Forward thinking approach to producing quality software development and utilising AI.
• Experience of working in mature CI/CD environments and following DevSecOps methodologies.

What’s in it for you?

This is an opportunity for someone passionate about technology who wants to join a fast‑growing SaaS company.

Salary for this role is £90,000 - 100,000 basic. It’s predominantly remote with once a month in Portsmouth.