Senior Full Stack Engineer

Atos SE; Greater London; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

25 days annual leave

Life Assurance

Income Protection

Pension contribution matched up to 10%

Flexible benefits

Job summary

Atos SE is seeking a Senior Full Stack Engineer to design and deliver complex software across multiple tech stacks. You will collaborate with clients and internal stakeholders, guiding hands-on development while shaping architecture and delivery.

The role sits within our Gen AI practice, contributing to high-impact AI-enabled platforms and large-scale system migrations. You will work across technologies, translating requirements into robust solutions, mentoring peers, and driving end-to-end

Qualifications

• Solid understanding of maintainable code and software architecture.
• Experience working across multiple technology stacks.
• Strong knowledge of library-appropriate, strongly typed languages (C++, Java, C#, Go, Rust) and front-end frameworks.

Responsibilities

• Design, build, and deploy scalable, high-quality systems.
• Translate business and client requirements into technical solutions.
• Work directly with clients, moving quickly from concept to production.
• Lead by example through hands-on development.
• Contribute to architectural decisions across multiple teams.
• Support and mentor engineers while remaining involved in delivery.

Skills

Full stack development

Architectural design

Client communication

Hands-on leadership

Multi-stack experience

Mentoring engineers

Tools

C++

Java

C#

Go

Rust

Job description

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Atos Group is a global leader in digital transformation with c. 63,000 employees and annual revenue of c. €8 billion, operating in 61 countries under two brands — Atos for services and Eviden for products. European number one in cybersecurity, cloud and high performance computing, Atos Group is committed to a secure and decarbonized future and provides tailored AI-powered, end-to-end solutions for all industries. Atos Group is the brand under which Atos SE (Societas Europaea) operates. Atos SE is listed on Euronext Paris.

The purpose of Atos Group is to help design the future of the information space. Its expertise and services support the development of knowledge, education and research in a multicultural approach and contribute to the development of scientific and technological excellence. Across the world, the Group enables its customers and employees, and members of societies at large to live, work and develop sustainably, in a safe and secure information space.

About Our Gen AI Team

Our Gen AI team brings together experienced engineers, diverse perspectives, and a flat team structure that enables visibility and impact from day one. With 40–50 professionals across the practice, we deliver some of the most exciting projects in the market — fromnextgenerationfintech payment platforms to global insurance systems deployed across multiple countries.

AI is an important part of our work, but this role is grounded in strong software engineering fundamentals. We are looking for senior engineers who enjoy architecture, system design, andendtoenddelivery, with a genuine interest in modern technologies, including AI.

The role requiresSecurity Clearance or ability to get SC in short timescales.

About the Role

We are seeking a Senior Full Stack Engineer who is passionate about building high‑quality software and designing robust systems. You will work on complex, large‑scale solutions across multiple technology stacks, collaborating closely with clients and internal stakeholders. While you will help guide other engineers, this role is engineering‑led rather than people‑management‑focused.

Where Purpose Meets Career

Technology

This is a true full stack role, offering exposure to a broad range of technologies and architectures. You will continuously upskill while working alongside highly talented engineers, selecting the most appropriate tools and languages for each challenge.

Contribute to diverse and meaningful projects

From automating government client systems and delivering large‑scale platform migrations, to applying AI to enhance our products — including next‑generation fintech payment platforms and global insurance systems deployed across multiple countries.

Culture

Our culture is built by people who genuinely love technology. We value curiosity, collaboration, and continuous learning, and we actively support innovation and knowledge sharing.

Your Future Role

As a Senior Full Stack Engineer, you will:

• Design, build, and deploy scalable, high‑quality systems
• Translate business and client requirements into technical solutions
• Work directly with clients, moving quickly from concept to production
• Lead by example through hands‑on development
• Contribute to architectural decisions across multiple teams
• Support and mentor engineers while remaining deeply involved in delivery

What You Bring

• A proven track record in full stack development
• Experience designing systems and solutions independently
• Experience providing technical leadership while staying actively involved in hands‑on development is highly valued.

Experience Required

• Solid understanding of maintainable code, systems design and software architecture
• Experience working across multiple technology stacks
• Strong experience withlibrary‑appropriate, strongly typed languages such as C++, Java, C#, Go or Rust, along with relevant front‑end frameworks
• High adaptability and the ability to learn new technologies quickly
• Interest in modern technologies such asnew languages, AI, cloud platforms
• Strong communication skills and confidence working with clients and distributed teams

Benefits

• 25 daysannual leave, with theoptiontopurchaseadditionaldays
• Life Assurance
• Income Protection
• Pension contribution matched up to 10%
• Flexible benefits, allowing you to tailor your package around wellbeing, family support, and more

Selection Process

Recruiter introduction

Diversity, Equity & Inclusion

Here at Atos, diversity and inclusion are embedded in our DNA.Read more about our commitment to a fair work environment for all.As a Disability Confident employer, we encourage applications from all applicants,especially,differently abled applicants.We aim to ensure that those who meet theminimumcriteria for this position will be offered an interview. We are committed and willing to making reasonable adjustments to the application and assessment process to accommodate your needs.

We are also a care leaver-friendly employer.

Here at Atos, diversity and inclusion are embedded in our DNA. Read more about our commitment to a fair work environment for all.

Atos is a recognized leader in its industry across Environment, Social and Governance (ESG) criteria. Find out more on our CSR commitment.