Principal Engineer

Solirius Consulting; Greater London; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

A technology consultancy firm in Greater London is seeking a Principal Engineer specializing in Java. You will drive innovation, lead technical teams and contribute to cutting-edge solutions. Candidates should exhibit technical leadership, software architecture, strong project management skills, and a collaborative approach to work. The role offers competitive compensation, flexible working arrangements, and numerous benefits.

Benefits

Competitive salary

Flexible working / Work from home

Private Healthcare

Generous annual discretionary bonus

25 days annual leave + bank holidays

10 days allocated development training per year

Contributory pension

Gym membership

Annual away days and social events

Qualifications

• Proven experience in technical leadership.
• Substantial experience as a hands-on Java Engineer.
• Ability to communicate design both verbally and in written form.

Responsibilities

• Working across the full lifecycle from requirement gathering to testing.
• Liaising with management and stakeholders on client requirements.
• Championing and contributing towards engineering best practices.

Skills

Technical leadership

Software architecture

Strong project management skills

Agile methodologies

Excellent communication skills

Tools

Java

Job description

About Us:

Solirius Reply, part of the Reply Group, delivers technical consultancy and application delivery to our clients in order to solve real world problems and allow our clients to respond to an ever-changing technical landscape. We partner closely with our clients, embedding our consultants into their businesses in order to provide a bespoke service, allowing us to truly understand our clients’ needs.

It is this close collaboration with our clients that has enabled us to grow rapidly in recent years and will drive our ambitious future growth plans. We currently have over 300 consultants working with a variety of key clients from both the public and private sectors such as the Ministry of Justice, Department for Education, FCDOS, UEFA, International Olympic Committee and Mercedes Benz; with plans to increase our client base further in the near future.

We operate as a flat organisation and believe in trusting and supporting our team to operate independently. We pride ourselves on being specialists at what we do, making the most of our consultants’ expertise in their fields in order to provide a best-in‑class service to our clients. All our consultants have the opportunity to work on a range of different projects, providing a broad range of knowledge on which to develop their careers and progress in the direction they choose.

The Role:

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!

About you:

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. You understand and align with Solirius Reply Values.

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

Package and Benefits:

• Competitive salary, dependent on experience
• Flexible working / Work from home
• Private Healthcare
• Generous annual discretionary bonus
• 25 days annual leave + bank holidays
• 10 days allocated development training per year
• Contributory pension
• Gym membership
• Annual away days and social events

Equality & Diversity:

Solirius Consulting is an equal opportunities employer. We are committed to creating a work environment that supports, celebrates, encourages, and respects all individuals and in which all processes are based on merit, competence and business needs. We do not discriminate on the basis of race, religion, gender, sexuality, age, disability, ethnicity, marital status or any other protected characteristics.

Should you require further assistance or require any reasonable adjustments be put in place to better support your application process, please do not hesitate to raise this with us.