{"id":2004306,"url":"https://alion.io/job/atos-lead-full-stack-engineer","title":"Lead Full Stack Engineer","company":{"id":3006,"name":"Atos","domain":"atos.net","url":"https://alion.io/company/atos","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"SuccessFactors","truth_index":{"grade":"A","score":99,"open_postings":4,"ghost_share":0,"stale_share":0.25,"repost_share":0,"time_to_fill_p50_days":17,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":["GB"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":84000,"max_usd":156000,"period":"year","method":"role_seniority_country_cell","sample_n":51},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Agentic Workflows","optional":false},{"name":"AI Agents","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"C#","optional":false},{"name":"CI/CD","optional":false},{"name":"Embeddings","optional":false},{"name":"Function Calling","optional":false},{"name":"Go","optional":false},{"name":"Human-in-the-Loop","optional":false},{"name":"JavaScript","optional":false},{"name":"Kubernetes","optional":false},{"name":"Python","optional":false},{"name":"RAG","optional":false},{"name":"React.js","optional":false},{"name":"Structured Outputs","optional":false},{"name":"Tool Use","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-09-29T00:00:00Z","employer_posted_date":"2026-09-29","last_verified_at":"2026-10-17T19:29:49Z","board_verified":true,"closed_at":null,"days_open":18,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":18},"description":"Atos is the Atos Group brand dedicated to AI-powered, secure, end-to-end digital services. Atos designs, develops, and operates critical digital environments that drive performance, resilience and sovereignty, helping public and private organizations worldwide retain control over their data and infrastructures, while meeting regulatory requirements.\nWith more than 52,000 employees serving over 4,500 clients across 54 countries, Atos helps modernize core IT systems, accelerate cloud and data transformation, strengthen cybersecurity, and deliver secure digital workplace environments to support its clients, its employees and society. Atos also provides consulting and advisory services through its Atos Amplify brand.\nA trusted partner in operating complex and mission-critical environments, Atos supports organizations across highly regulated and sovereign contexts.\nAbout Atos Group\nAtos Group is a global leader in digital transformation with c. 54,000 employees and annual revenue of c. €7.2 billion, operating in 54 countries under two brands - Atos for services and Eviden for products and systems. European number one in cybersecurity and a leader in cloud, 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 listed on Euronext Paris.\nAbout Our Team\nOur Full stack engineering 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 - from next-generation fintech payment platforms to global insurance systems deployed across multiple countries.\nAI 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, and end-to-end delivery, with a genuine interest in modern technologies, including AI.\nThe role requires Security Clearance or ability to get SC in short timescales.\nWe are looking for an exceptional Lead Full Stack Engineer who wants to solve difficult problems, build important systems and remain genuinely hands-on.\nYou will lead the engineering of complex, high-profile software and AI-enabled solutions for major government and enterprise clients. These are environments where security, resilience, scale and sound technical judgement matter, and where the systems you build deliver real operational outcomes.\nThis is not a coordination role or an architecture position detached from delivery. You will write production code, tackle the hardest technical challenges, make critical design decisions and set the engineering standard for the teams around you.\nWhat exceptional looks like\nYou can enter an unfamiliar programme, understand the system quickly, identify the real constraints and establish a credible technical route forward.\nYou can design the solution, build its most difficult components, integrate models and tools, implement the necessary controls and explain your decisions to a senior client. You make good engineers better and leave behind stronger systems, practices and teams.\nYou combine the depth of a principal engineer, the breadth of a full stack engineer, the practical capability of an AI engineer and the judgement of a trusted technical consultant.\nIf you still love building software, want ownership of genuinely difficult engineering challenges and care about delivering systems that work in the real world, we would like to hear from you.\nTechnical landscape\nWe do not recruit around a rigid stack. You may have experience with technologies such as Go, Java, C#, Python, JavaScript, TypeScript, React, AWS, Azure, Kubernetes, relational databases, event-driven systems, open-weight models, vector search or agent orchestration frameworks.\nDepth, adaptability and engineering judgement matter more than matching a checklist.\nWhat makes this role different\nYou will have the opportunity to:\nShape technically ambitious programmes from discovery through to production.\nWork across modern software engineering, cloud, AI and agentic AI.\nSolve complex problems without being constrained to a single technology stack.\nTest new technologies and approaches against real delivery challenges.\nInfluence engineering standards, reusable patterns and technical strategy.\nWork directly with senior client stakeholders and become a trusted technical adviser.\nMentor strong engineers and build high-performing engineering teams.\nDeliver systems with meaningful impact across major government and enterprise services.\nWhat you’ll do\nLead the design and delivery of secure, resilient and production-grade applications.\nRemain hands-on across frontend, backend, APIs, data, integration, cloud and deployment.\nBuild AI-enabled applications and agentic workflows that connect models, tools, data and enterprise systems.\nDesign agent orchestration, retrieval, context, state, memory, permissions and human oversight.\nEstablish robust approaches to AI evaluation, security, reliability, observability and cost.\nSolve difficult problems across architecture, performance, scalability and production operations.\nMake pragmatic technical decisions based on evidence and clearly explain the trade-offs.\nLead teams through ambiguity and complex delivery rather than waiting for perfect requirements.\nRaise engineering standards through practical leadership, mentoring and constructive challenge.\nWork closely with clients, architects, product teams and delivery leaders.\nWhat we’re looking for\nYou will be an outstanding software engineer who has developed into a technical leader without moving away from engineering.\nYou will bring:\nExceptional and recent hands-on software engineering experience.\nA record of personally delivering complex, production-grade systems.\nDeep understanding of how modern systems operate end to end.\nStrong system-design and architecture capability backed by the ability to implement and validate your decisions.\nBroad experience across frontend, backend, APIs, databases, automated testing, CI/CD, containers and cloud platforms.\nExperience diagnosing difficult issues across application, infrastructure and runtime boundaries.\nGenuine technology independence and the ability to master unfamiliar tools and platforms quickly.\nStrong judgement across security, performance, reliability, maintainability, observability and cost.\nExperience leading and mentoring excellent engineers while remaining technically credible.\nThe confidence to challenge weak assumptions and defend better technical approaches.\nExcellent communication and client-facing skills.\nExperience working in government, regulated or complex enterprise environments.\nEligibility and willingness to obtain SC clearance.\nAI and agentic AI capability\nYou will have practical experience taking AI beyond demonstrations and into secure, supportable production environments.\nWe are looking for experience in areas such as:\nBuilding applications using large language models or other modern AI models.\nDesigning agentic workflows involving tool use, structured outputs and external system integration.\nRetrieval-augmented generation, embeddings, grounding and context management.\nAgent orchestration, state, memory, permissions, error recovery and human-in-the-loop controls.\nEvaluation of quality, reliability, safety and measurable business outcomes.\nAI security, including prompt injection, data protection, access control and auditability.\nHosted, private, open-weight, sovereign or disconnected deployment patterns.\nAI-assisted software engineering, with rigorous validation of generated code and designs.\nJust as importantly, you will know when AI is the right solution and when conventional deterministic software is the better engineering choice.\nRecruiter Contact:\nPlease write directly to Ofelia Georgieva on Ofelia Georgieva | LinkedIn \nDiversity, Equity & Inclusion\nHere 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 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.\nWe 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 - \nHere at Atos, diversity and inclusion are embedded in our DNA. Read more about our commitment to a fair work environment for all.\nAtos is a recognized leader in its industry across Environment, Social and Governance (ESG) criteria. Find out more on our CSR commitment.\nChoose your future. 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