Principal Software Engineer

Matchtech • Paid as a contractor rate • 6-month contract • 2 days ago

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Salary

$25k per year

Location

In office (United Kingdom)

Seniority

Principal

Employment

Contractor

Confirmed on the employer's own hiring board on Oct 6, 2026. First seen by Alion on Oct 5, 2026.

Overview

Company

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Profile match

Matchtech

Matchtech is a UK engineering and technology recruitment agency headquartered in Whiteley near Fareham, Hampshire, placing contract, temporary and permanent staff with clients. Founded in 1984, it covers aerospace, automotive, maritime, defence and security, energy, highways, rail, water and utilities, construction and technology, and also offers managed service, RPO and recruit-train-deploy programmes for employers such as BAE Systems, Leonardo and NATS. Its vacancies, posted on behalf of clients, include civil, mechanical, process and EICA engineers, CAD technicians, software developers, project managers and site staff across the UK.

matchtech.com • HQ: Whiteley, United Kingdom • Government • Science & Engineering • Professional Services • 11-50 employees • Est. 1984

Principal Software Engineer (Contract) - Naval Radar

BAE Systems (Defence Solutions) | Cowes, Isle of Wight | 6 months | Inside IR35

BAE Systems (Defence Solutions) is seeking an experienced Principal Software Engineer to support the development, maintenance and enhancement of advanced naval radar systems in service with the Royal Navy. Based full-time onsite in Cowes, you'll provide technical leadership across the software lifecycle, working within a large, established engineering environment.

Key details

Location: Cowes, Isle of Wight (full-time onsite)
Contract length: 6 months initially
IR35: Inside IR35
Rate: £54.57/hour PAYE or £73.68 Umbrella
Clearance/constraints: BPSS + full SC required to start, UK Eyes Only, subject to ITAR

What you'll be doing

Designing and developing software sub-system solutions for naval radar products
Providing technical expertise across requirements, design, implementation, test and verification
Deriving and maintaining software requirements from system requirements/baselines
Producing and maintaining software designs using high-level methodologies (UML essential)
Leading/participating in peer reviews, technical reviews, verification and approval of designs
Supporting the replacement of obsolete hardware/software to maintain and enhance radar capability
Acting as a technical lead at sub-system level across multiple projects and products
Maintaining software to address defects and implement new functionality
Supporting estimates and contributing to team development/mentoring

What we're looking for

Strong experience across the full software development lifecycle
Considerable experience in at least one high-level programming language (Ada95 desirable)
UML (essential) and structured design methodology experience
Understanding of software lifecycle models (e.g., Waterfall and Agile)
Knowledge of relevant standards (e.g., ISO/IEC/IEEE 12207)
Solid understanding of configuration management and use of CM tools
Strong communication skills with the ability to influence, guide and mentor others
Degree in Computer Science / Engineering (or similar numerate discipline); CEng or working towards is beneficial

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