Principal Java Engineer

NPA WorldWide; Sheffield; Hybrid; GBP 60,000 - 90,000; Full time

Job summary

A mission-led consultancy in the UK seeks an experienced Principal Software Engineer (Java) to join their growing team. This senior-level position involves leading software design and development for secure systems within the government and defence sectors. The ideal candidate has deep Java expertise, full-stack skills, and is experienced in guiding engineering teams. Benefits include a flexible work environment, private healthcare, and career progression opportunities in a high-impact sector.

Benefits

Flexible working with remote options

Learning & development budget

Private healthcare

Matched pension scheme

Monthly socials and quarterly company meetups

Qualifications

• Strong knowledge of system architecture, cloud solutions, and API design.
• Proven experience leading teams or projects at a senior/principal level.
• Track record of delivering secure, production-grade systems in agile teams.

Responsibilities

• Lead the design, development, and testing of secure, scalable systems.
• Collaborate with stakeholders to ensure user-focused solutions.
• Guide and mentor engineers promoting best practice.

Skills

Deep expertise in Java

Full-stack engineering skills

Excellent stakeholder engagement

Strong communication skills

Tools

CI / CD

Containers

Infrastructure as Code

Job description

Job description

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 opportunity for a hands‑on engineer who enjoys leading by example, thrives in agile environments, and is passionate about shaping engineering best practice while still contributing to the codebase.

Key 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 secure or classified environments
• Knowledge of ITSM or systems within the government / defence sector
• Experience balancing technical leadership with hands‑on development

Whats 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 & 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 youre an experienced Principal Software Engineer with expertise in Java, and youre excited to help deliver solutions that truly matter, wed 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)

Salary Details

• Salary Type : Annual Salary
• Salary Min : £60000
• Salary Max : £90000
• Currency Type : GBP