Principal Software Engineer jobs in Berkshire

I’m supporting an early-stage AI startup building genuinely transformational tooling for some of the most document-heavy industries out there. They’re now looking for a Staff or Principal Software Engineer who wants to design and ship AI-driven product capabilities end-to-end, from the first customer conversation all the way to production rollout and adoption. What you’ll be doing - Owning...

Principal Software Engineer .NET £90,000-£110,000 Remote (UK) Do you thrive on building scalable solutions that power commerce worldwide? We're partnering with a rapidly expanding global payment platform fresh off a transformative acquisition. They're engineering a robust, merchant-centric ecosystem built on quality, resilience, and scale - and they need exceptional .NET Software Engineers to...

Principal Software Engineer Fully Remote | Permanent | £85,000 - £115,000 Harrington Starr has partnered with a leading Global Payments Technology company who are seeking to hire a Principal Software Engineer to join their senior engineering leadership team. This is a rare opportunity to combine hands-on development with strategic influence, guiding architecture decisions and shaping the...

You will help them stay ahead of the curve by solving both technical and sociotechnical problems. You would be joining a squad of Principal engineers with different expertise that serves as a centre of excellence to the 16+ engineering teams in the wider engineering function.

Senior Backend Engineer | London | £100,000 - £160,000 | Python | FastAPI | Systems Location: London based - hybrid Salary: £100,000 - £160,000 + equity Tech Stack: - Backend: Python (FastAPI) - Cursor, Claude Code - AWS Are you a backend engineer who cares more about building robust systems than chasing AI hype? We are working with a recently funded Series A technology company building AI...

Principal EC&I Engineer Reading - Hybrid - 3 days a week in office £50-55 per hour Outside of IR35 Are you an EC&I Engineer who has at least 10+ years experience designing within an building services industry? If so, please read on... Essential Requirements: - 10-15+ years' experience working as a EC&I Engineer - 5+ years working within the Nuclear industry - Degree qualified in Electrical...

Principal Engineer (Education) Competitive + Bonus + Benefits UK, Remote Permanent full time Summary The Principal Software Engineer role is a key role in the IRIS Engineering Organization and is one of the keystones in the delivery of World-Class Customer Products, Developer experience and the advancement of our technology xujxxms in .NET and C#. As a Principal Software Engineer, your...

You will support in reverse engineering and deep understanding of vulnerabilities, including impact analysis and automation.

You must relish the challenge of findings critical vulnerabilities in complex software binaries through automation and manual practices. Creativity is highly valued; being able to find novel vulnerabilities is essential in this role.

Cyber Software Vulnerability Engineer If you are interested in applying for this job, please make sure you meet the following requirements as listed below. Package - £45,000 - £65,000 (depending in experience level) Benefits - DV Bonus plus excellent benefits Clearance - Clearable to eDV level, SC clearance required to start. Location - Hampshire, Surrey or London - hybrid working Join a...

You will design, implement, and test robust flight software on RTOS or Embedded Linux platforms, taking systems from simulation through launch and on-orbit operations within a fast-paced, mission-driven environment. Key Responsibilities

You will take individual responsibility for a range of project types, manage them independently and be the clients main point of contact.

You will lead independently and proactively on technical aspects including preparing designs, specification, technical approval submissions, site supervision and will be fully conversant with industry design standards.

Job Description Modeling Engineer – DSP / Software – Semiconductors – Berkshire – Hybrid – Generous salary. A Modeling Engineer with good knowledge of control theory and digital algorithms together with proficiency in C++, Matlab or Python/NumPy programming languages will join a thriving Semiconductor Company, contributing to their system-level modelling of serial communication links. With a...

You will be a vital part of this evolution, contributing your expertise to our strategy and helping us redefine what services we offer our clients.

You will ensure buildings are designed to minimise fire risks, through contributing to the development of fire strategy reports, calculations and fire risk assessments.

Principal ILS & Obsolescence Engineer Introduction: This organisation sits at the heart of some of the UK’s most critical defence and maritime programmes, delivering technology that genuinely matters. They’re now strengthening their Integrated Logistics Support capability with a senior engineer who can shape strategy, guide teams, and influence delivery across complex systems. Role...

You will apply your expertise in software engineering and aviation systems to guide the development of high-integrity aircraft control solutions, ensuring safety, reliability, and compliance with industry standards. Additionally, you will mentor and support your team, fostering a culture of technical excellence and continuous improvement.

Senior Principal Electrical Engineer 1 – Mott MacDonald Join the Energy Unit's Nuclear, Defence and Civil division as a Senior Principal Electrical Engineer. You'll lead and deliver projects for the nuclear industry while contributing technical excellence in a collaborative team across the UK. Responsibilities - Act as an Engineering Manager, leading teams to meet client requirements on time,...

DV Cleared Senior Software Engineer Do you have the skills to fill this role Read the complete details below, and make your application today. Aldermaston - Onsite 12-month contract | Outside IR35 Are you a DV cleared Software Engineer who can take full ownership of software delivery on site? Do you enjoy building Siemens PLC solutions from scratch in secure, regulated environments?...

You will support in reverse engineering and deep understanding of vulnerabilities, including impact analysis and automation.

You must relish the challenge of findings critical vulnerabilities in complex software binaries through automation and manual practices. Creativity is highly valued; being able to find novel vulnerabilities is essential in this role.

Principal Software Engineer .NET £90,000-£110,000 Remote (UK) Do you thrive on building scalable solutions that power commerce worldwide? We're partnering with a rapidly expanding global payment platform fresh off a transformative acquisition. They're engineering a robust, merchant-centric ecosystem built on quality, resilience, and scale - and they need exceptional .NET Software Engineers to...

Principal Software Engineer Fully Remote | Permanent | £85,000 - £115,000 Harrington Starr has partnered with a leading Global Payments Technology company who are seeking to hire a Principal Software Engineer to join their senior engineering leadership team. This is a rare opportunity to combine hands-on development with strategic influence, guiding architecture decisions and shaping the...