Principal Java Developer

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

Job summary

A mission-led consultancy in the UK is seeking an experienced Principal Software Engineer to lead the design and development of secure, scalable systems using Java. This senior-level role offers flexible working hours, a strong focus on learning and development, and opportunities for career growth in a meaningful sector. Ideal candidates will have deep expertise in Java and proven experience leading teams in agile environments.

Benefits

Flexible working

Monthly socials

Private healthcare

Learning & development budget

Matched pension scheme

Clear career progression

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).

Responsibilities

• Lead the design and development of secure, scalable systems using Java.
• Architect and maintain APIs, data pipelines, and cloud-native solutions.
• Guide and mentor engineers, promoting best practice and agile delivery.
• Collaborate with stakeholders to shape technical direction.

Skills

Deep expertise in Java

Strong full-stack engineering skills

Excellent stakeholder engagement

Strong knowledge of system architecture

Knowledge of cloud solutions

Experience with DevOps tools

Job description

Job description

• 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 life cycle, 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 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 is This a Great Opportunity

• Flexitime 37.5 hrs / week structured your way + 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: £60,000
• Salary Max: £90,000
• Currency Type: GBP