Overview

Our client, a mission-led consultancy, is looking for an experienced Principal Software Engineer (Java) to join their growing team. They deliver secure, modern software solutions to the UK Government and Defence sectors, enabling clients to build scalable systems and progressive web applications that drive real impact.

This is a senior-level, hands-on engineering role focused on leading by example, thriving in agile environments, and shaping engineering best practice while contributing to the codebase.

Responsibilities

• Lead the design, development, and testing of secure, scalable systems using Java with modern front-end frameworks (e.g., React)
• Architect and maintain APIs, data pipelines, and cloud-native solutions (AWS, Azure, private cloud)
• Drive adoption of DevOps practices: CI/CD, containers, infrastructure-as-code
• Guide and mentor engineers, promoting best practice, clean coding, and agile delivery
• Collaborate with stakeholders and clients to shape technical direction and ensure robust, user-focused solutions
• Contribute across the full software development lifecycle, from discovery to production support

Essential Skills & Experience

• Deep expertise in Java, with strong full-stack engineering skills
• Proven experience leading teams or projects at a senior/principal level
• Strong knowledge of system architecture, cloud solutions, and API design
• Familiarity with DevOps tools and automation (CI/CD, containers, IaC)
• Track record of delivering secure, production-grade systems in agile teams
• Excellent stakeholder engagement, influencing, and communication skills

Desirable

• Background in insecure or classified environments
• Knowledge of ITSM or systems within the government/defence sector
• Experience balancing technical leadership with hands-on development

What’s in It For You

• Flexible working 37.5 hrs/week with remote and hybrid options
• Learning & development budget for training, certifications, and conferences
• Private healthcare and matched pension scheme
• Monthly socials and quarterly company meetups
• Clear career progression into leadership roles in a high-impact sector

Diversity & Inclusion

Our client is an equal opportunities employer and a Disability Confident organisation, committed to fostering a workplace where diverse perspectives are celebrated and everyone can thrive.

How to Apply

If you’re an experienced Principal Software Engineer with expertise in Java, and you’re excited to help deliver solutions that truly matter, we’d love to hear from you.

Qualifications

• Deep expertise in Java, with strong full-stack engineering skills
• Proven experience leading teams or projects at a senior/principal level
• Strong knowledge of system architecture, cloud solutions, and API design
• Familiarity with DevOps tools and automation (CI/CD, containers, IaC)

Why This Is a Great Opportunity

• Flexitime: 37.5 hrs/week structured to suit you, with remote options
• Learning budget for training, certifications, and conferences
• Private healthcare and matched pension
• Monthly socials and quarterly company meetups
• Career growth in a fast-moving, meaningful sector
• Salary Type: Annual Salary
• Salary Min: £75,000
• Salary Max: £95,000
• Currency Type: GBP

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Engineering and Information Technology

Industries

• Staffing and Recruiting

Referrals increase your chances of interviewing at NPAworldwide by 2x

Sign in to set job alerts for “Senior Java Software Engineer” roles.

We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI.