Principal Engineer

About Us

Solirius Reply, part of the Reply Group, is a technology consultancy and digital transformation partner that helps organisations solve complex challenges through strategy, design, engineering, and delivery.

We work closely with our clients to deliver secure, accessible, user‑focused services that evolve with their needs. By combining deep technical expertise with people‑centred design, we create solutions that deliver meaningful, lasting impact.

Our consultants partner directly with client teams, embedding into organisations to understand their goals, challenges, and users. This collaborative approach enables us to deliver tailored solutions that drive measurable outcomes across public and private sectors.

Past and present clients include the Ministry of Justice, Department for Education, Ministry of Housing, Communities and Local Government, UEFA, International Olympic Committee, and Mercedes-Benz. Our services span the full digital delivery lifecycle, including architecture, engineering, delivery management, user‑centred design, business analysis, data, Dev Ops, and AI.

We operate as a collaborative and inclusive organisation that empowers our people to take ownership, innovate, and develop their expertise. As an equal opportunities employer, we are committed to encouraging equality, diversity, and social mobility, while creating opportunities for our teams to work on meaningful projects that deliver lasting impact.

You are a motivated and adaptable professional with a strong analytical mindset and a passion for using technology to solve real‑world problems. You enjoy working in collaborative, agile teams and take pride in delivering high‑quality solutions that make a tangible impact. With strong communication skills and a consultative approach, you’re comfortable engaging with clients, understanding their needs, and translating them into effective outcomes.

This is an exciting opportunity to join our Software Engineering Practice as a Principal Engineer, specialising in Java. As a Principal Engineer, you’ll be at the forefront of driving innovation, leading technical teams, and shaping cutting‑edge solutions. If you’re passionate about technical leadership, software architecture, and making a real impact, this could be the perfect fit for you!

Key Responsibilities:

• Working across the full lifecycle from requirement gathering and design, through to coding and into testing, deployment and maintenance.
• Liaising with management and stakeholders on client requirements and understanding team objectives.
• As a consultant with Solirius you will have exposure to a variety of projects and challenges
• Championing and contributing towards engineering best practices across our team and projects.
• Identifying/creating ideas for technical solutions
• Providing feedback to project teams on progress/outcomes
• Advise developers on technical decisions

Key Skills/

Experience:

You need to be technically sound but also be able to convey your knowledge and expertise to clients internally and externally. In terms of specific languages you should have commercial experience in some or all of the following;

• Proven experience in technical leadership.
• Expertise in software architecture and design.
• Strong project management skills.
• Agile methodologies
• A passion for innovation and problem‑solving.
• Excellent communication and collaboration skills.
• Substantial experience as a hands‑on Java Engineer
• Ability to advocate Java/Coding principles, practices and philosophy
• Ability to communicate your design, both verbally and in written form
• Ability to work with senior stakeholders and detailed technical specialists
• Beneficial to have worked within the Government previously or Public Sector

• Competitive Salary
• Bonus Scheme
• Private Healthcare Insurance
• 25 Days Annual Leave + Bank Holidays
• Up to 10 days allocated for development training per year
• Enhanced Parental Leave
• Paid Fertility Leave (5 Days)
• Statutory & Contributory Pension
• EAP with Help@Hand
• Gym Membership Benefits
• Cycle to Work and Electric Vehicle schemes
• Flexible Working
• Annual Away Days/Company Socials

As an equal opportunities employer, we are…