Senior Software Engineer

Job description We are seeking an exceptional Java Software Engineering Consultant to join our engineering community at the intersection of modern software delivery and applied AI - building and shipping software. The successful candidate will have deep expertise in Java/Spring Boot microservices development, combined with deep hands-on expertise with large language models driving agentic flows, whether via prompt engineering or otherwise. The key responsibilities will cover Software Engineering & Delivery: Design, build, and ship production-quality Java/Spring Boot microservices and APIs within our current business controls. Build and Optimise DecOps pipelines - enhancing CI/CD processing, including testing and platform/process observability Design, iterate, and optimise prompts for a wide range of LLM use cases instruction following, structured output generation, classification, summarisation, code generation, and reasoning tasks Build and manage prompt libraries and versioning strategies, treating prompts as first-class engineering artefacts Collaborate with product and domain teams to translate business requirements into precise, well-structured prompt specifications Agentic AI & LLM Integration: Architect and implement /maintain agentic systems autonomous agents, multi-agent pipelines, tool-use workflows, planning loops, and memory augmented reasoning Implement LLM observability logging, tracing, evaluation pipelines, and guardrails to maintain quality and reliability in production AI systems Advise on responsible AI deployment, including output validation, human-in-the-loop design, and risk mitigation for agentic workflows Technical Skills & Experience Required Full-Stack Engineering: Strong proficiency in Java / Spring Boot REST APIs, event-driven services, security, and performance optimisation Solid React development skills and API integration Experience with relational and in memory databases (PostgreSQL, Redis) Messaging and streaming platforms Kafka, or equivalent Experience building and integrating AI/LLM solutions into Java-based enterprise applications Prompt Engineering: Demonstrable, hands-on Experience engineering prompts for production LLM applications not just prototypes Familiarity with prompt evaluation frameworks and tooling (PromptFlow, LangSmith, Braintrust, or custom eval pipelines) Understanding of tokenisation, context limits, temperature tuning, and model-specific behaviours across major LLM providers Experience structuring prompts for tool/function calling, structured JSON output, and multi-turn conversations DevOps & Infrastructure: Kubernetes deployments, services, ingress, Helm, Kustomize, HPA, and RBAC CI/CD pipelines GitHub Actions, GitLab CI, Jenkins, or equivalent Infrastructure as code Terraform Cloud platforms AWS, GCP, or Azure Job Title: Senior Software Engineer Location: Sheffield, UK Rate/Salary: 550.00 - 600.00 GBP Daily Job Type: Contract Trading as TEKsystems. Allegis Group Limited, Maxis 2, Western Road, Bracknell, RG12 1RT, United Kingdom. No. 2876353. Allegis Group Limited operates as an Employment Business and Employment Agency as set out in the Conduct of Employment Agencies and Employment Businesses Regulations 2003. TEKsystems is a company within the Allegis Group network of companies (collectively referred to as "Allegis Group"). Aerotek, Aston Carter, EASi, Talentis Solutions, TEKsystems, Stamford Consultants and The Stamford Group are Allegis Group brands. If you apply, your personal data will be processed as described in the Allegis Group Online Privacy Notice available at https://www.allegisgroup.com/en-gb/privacy-notices. To access our Online Privacy Notice, which explains what information we may collect, use, share, and store about you, and describes your rights and choices about this, please go to https://www.allegisgroup.com/en-gb/privacy-notices. We are part of a global network of companies and as a result, the personal data you provide will be shared within Allegis Group and transferred and processed outside the UK, Switzerland and European Economic Area subject to the protections described in the Allegis Group Online Privacy Notice. We store personal data in the UK, EEA, Switzerland and the USA. If you would like to exercise your privacy rights, please visit the "Contacting Us" section of our Online Privacy Notice at https://www.allegisgroup.com/en-gb/privacy-notices for details on how to contact us. To protect your privacy and security, we may take steps to verify your identity, such as a password and user ID if there is an account associated with your request, or identifying information such as your address or date of birth, before proceeding with your request. If you are resident in the UK, EEA or Switzerland, we will process any access request you make in accordance with our commitments under the UK Data Protection Act, EU-U.S. Privacy Shield or the Swiss-U.S. Privacy Shield. TPBN1_UKTJ