Senior Full Stack Engineer

American Society of Civil Engineers; City Of London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

25 days annual leave

Private Healthcare

Life Assurance

Income Protection

Pension contribution matched up to 10%

Flexible benefits

Job summary

Atos is seeking a Senior Full Stack Engineer to design and deliver robust, scalable software across multiple tech stacks. You will work closely with clients and internal teams, guiding engineering while maintaining hands-on delivery.

You will contribute to architectural decisions, explore AI and cloud technologies, and benefit from a collaborative, innovation‑driven culture.

Qualifications

• Proven track record in full stack development.
• Experience designing systems and solutions independently.
• Technical leadership while staying hands-on is highly valued.
• Experience across multiple technology stacks.
• Strong experience with library-appropriate, strongly typed languages (C++, Java, C#, Go, Rust) and front-end frameworks.
• Adaptable and quick to learn new technologies.
• Interest in AI and cloud platforms.

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.
• Mentor engineers while remaining involved in delivery.

Skills

Full stack development

Technical leadership

Hands-on development

Client collaboration

Tools

C++

Java

C#

Go

Rust

Job description

About Atos Group

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 Team

Our Full stack engineering team brings together experienced engineers, diverse perspectives, and a flat team structure that enables visibility and impact from day one. With 4050 professionals across the practice, we deliver some of the most exciting projects in the market from next-generation fintech payment platforms to global insurance systems deployed across multiple countries.

The role requires Security 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.

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.

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 with library-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 as new languages, AI, cloud platforms


• Strong communication skills and confidence working with clients and distributed teams

• Experience providing technical leadership while staying actively involved in hands-on development is highly valued.

Your Benefits, Your Way

• 25 days annual leave, with the option to purchase additional days


• Private Healthcare


• 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


• Online test (approximately 35 minutes, completed in your own time)


• Technical interview with the Head of Gen AI Practice


• Live coding session with a future colleague

(All interviews are conducted via MS Teams.)

Diversity, Equity & Inclusion

Here at Atos, diversity and inclusion are embedded in our DNA. 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 the minimum criteria 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. If you require additional support with your application, please contact our recruiter or send an email to our dedicated mailbox -