Senior Java Developer

Alten Ltd; City Of London; Hybrid; GBP 50,000 - 70,000; Full time

Job summary

A global engineering consultancy is seeking a Senior Developer to design Java-based applications for advanced submarine systems in the Defence sector. The role involves creating RESTful APIs and ensures compliance with secure coding practices. Ideal candidates should have 5+ years in software development, particularly in Java, and should be eligible for UK Security Clearance. The position offers a hybrid work model and includes benefits like private medical insurance and a pension scheme.

Benefits

Private Medical Insurance

Pension Scheme

Cycle-to-work Scheme

Competitive salary

Regular team gatherings

Qualifications

• 5+ years of experience in software development, specifically in Java.
• Eligibility for UK Security Clearance (SC) is required.
• Experience working under defence sector standards.

Responsibilities

• Design and develop Java-based applications for advanced submarine systems.
• Implement RESTful APIs and ensure compliance with security requirements.
• Participate in system design and architecture reviews.

Skills

Java proficiency

REST API development

IntelliJ IDEA

Atlassian toolset (Jira, Confluence)

Enterprise Architect knowledge

Secure coding practices

Communication skills

Problem-solving ability

Education

Bachelor's or Master's in Software Engineering or Computer Science

Relevant technical military background

Tools

Docker

Job description

Company Description

Are you passionate about engineering? Do you want to make a difference? ALTEN is a global engineering and technology consultancy operating across over 30 countries worldwide. We partner with industry leaders across sectors including Aeronautics, Aerospace, Defence, Naval, Automotive, Energy, Rail, and many more to deliver innovative engineering solutions that drive technological advancement and support sustainable transformation. Our teams of passionate and agile engineers work on cutting‑edge projects that shape the future of technology and sustainability. At ALTEN, we empower talented engineers to innovate, solve complex challenges, and deliver impactful solutions that build tomorrow's world today.

Job Description

Join our team to develop Java‑based applications for advanced submarine systems in the Defence sector. You’ll design and implement RESTful APIs, collaborate on system architecture, and ensure compliance with secure coding practices and defence standards. This is an exciting opportunity to work on mission‑critical software that underpins naval operations, applying your expertise in Java, Agile development, and system modelling to deliver robust, scalable solutions.

Location: Dorset
Work arrangement: Hybrid (3 days per week)
Seniority: Senior (5+ years experience)
Security clearance: Eligible for SC Clearance

Key Responsibilities

• Design, develop, and maintain Java‑based applications within a service‑oriented architecture.
• Implement and manage RESTful APIs for integration and interoperability.
• Collaborate with cross‑functional teams to ensure compliance with defence standards and security requirements.
• Participate in system design and architecture reviews using Enterprise Architect.
• Apply Agile development practices and contribute to continuous improvement initiatives.

Qualifications

Required Skills

• Strong proficiency in Java and REST API development.
• Experience with IntelliJ IDEA and the Atlassian toolset (Jira, Confluence).
• Knowledge of Enterprise Architect for system modelling.
• Understanding of secure coding practices and defence sector requirements.

Soft Skills & Collaboration

• Excellent communication and teamwork skills.
• Ability to work effectively in multi‑disciplinary environments.
• Strong problem‑solving and analytical mindset.

Desirable Skills

• Familiarity with CI/CD pipelines and containerisation technologies (e.g., Docker).
• Experience with secure software development lifecycle.
• Knowledge of Defence domain processes and safety‑critical standards.

Required Qualifications

• Must be eligible for or already hold UK Security Clearance (SC).
• Bachelor's or Master's degree in Software Engineering, Computer Science, or related discipline OR relevant technical military background with proven software development experience.

Additional Information

Why join us?

We foster a community of dually talented individuals who are both entrepreneurs and technology specialists. Our teams embody the spirit of innovation and entrepreneurship, enabling us to develop solutions most efficiently.

Our commitment to sustainable growth is unwavering, and we continuously strive for accelerated transformation and continuous improvement. Through ALTEN labs, mentoring programs, internal universities, and more, we are always pushing boundaries and embracing new possibilities.

We offer incredible opportunities to join inspiring projects in the most innovative companies.

We prioritise your career development with personalised support plans tailored to your own aspirations. We're here to empower you and help you reach your full potential.

Join our passionate team and start building tomorrow, today!

In short you get :

• A personalised career path and a rewarding management style.
• A chance to work on the most exciting engineering projects and technologies along with premium customers.
• A huge diversity of engineering projects and industries.
• A competitive salary.
• Private Medical Insurance.
• Pension Scheme.
• Cycle‑to‑work Scheme among many additional benefits.
• Social atmosphere, regular gatherings, and team buildings.

Flexible way of working (role dependent)

This role will require you to have or be willing to go through Security Clearance. As part of the onboarding process candidates will be asked to complete a Baseline Personnel Security Standard; details of the evidence required to apply may be found on the government website Gov.UK. If you are unable to meet this and any associated criteria, then your employment may be delayed or rejected. Details of this will be discussed with you at interview.