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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Engineer (MongoDB & AWS Serverless - **Company:** Legal Limited - **Location:** Cardiff, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Clean Code Principles, Agile Methodology, Amazon Web Services, Automation of Tests, Cloud Engineering, Software Quality, Continuous Integration, Data Stores, Software Design Patterns, Distributed Systems, MongoDB, NoSQL, Performance Tuning, Scrum Methodology, Scaled Agile Framework, Software Engineering, Software Systems, SQL Databases, Strategies of Testing, Cloud Platform System, Software Security, Technical Debt, Cloudformation, Containerization, Api Gateway, Serverless Computing, Microservices - **Published:** August 21, 2026 - **Apply:** https://www.careerjet.co.uk/job/gb6aa35e2710d0732acb154ad83cf782a0/eaa ## About the Role * Strong expertise in modern software engineering, including clean code, clean architecture, design patterns, distributed systems, microservices, and cloud-native application design * Proven experience delivering serverless solutions on AWS, with hands-on use of services such as Lambda, API Gateway, ECS, and infrastructure-as-code using CloudFormation and serverless frameworks * Deep, practical experience with MongoDB, including schema design, performance optimisation, and advanced aggregation pipelines, alongside a solid understanding of SQL and other NoSQL data stores * Extensive experience building and maintaining large-scale systems using TDD, automated testing, CI/CD pipelines, and containerisation, with a clear emphasis on reliability and operational excellence * A strong security-first mindset, with real-world experience in secure application development, web and API security, threat modelling, and compliance in cloud environments * Demonstrated ability to solve complex technical problems, make sound architectural decisions, navigate ambiguity, and balance immediate delivery needs with long-term system health * Significant experience working in Agile environments (Scrum, Kanban), contributing to effective planning, prioritisation, dependency management, and continuous improvement across teams * A natural technical leader and communicator who can mentor others, facilitate technical discussions, collaborate effectively with non-technical stakeholders, and positively influence team culture and outcomes ## Description We are looking for a highly skilled Senior Software Engineer to play a critical role in designing, building, and evolving our cloud-native platforms. You will bring deep technical expertise, strong engineering judgement, and a customer-first mindset to deliver secure, scalable, and high-performing software. As a senior member of the team, you will help shape technical direction, reduce complexity and technical debt, and continuously improve how we engineer, deliver, and operate our services. This role has a strong emphasis on AWS serverless technologies and MongoDB, operating within a modern, Agile engineering environment. What you'll be doing: * Owning the design and delivery of high-quality software solutions, working end-to-end across features, services, and systems to deliver meaningful customer and business outcomes * Building and operating cloud-native, serverless applications on AWS, ensuring solutions are secure, resilient, scalable, and optimised for performance and cost * Leading by example in applying clean code, sound architectural principles, and engineering best practices that align with Legal & General's SSDLC and technology strategy * Actively identifying, prioritising, and addressing technical debt, ensuring long-term maintainability, reliability, and operability of our platforms * Defining and influencing test strategies that raise the quality bar, with a strong focus on security, accessibility, usability, resilience, and non-functional requirements * Performing and leading high-quality code reviews, providing constructive feedback that improves code quality, system design, and team capability * Driving continuous improvement in team processes, tooling, and ways of working, fostering a culture of learning, accountability, and technical excellence * Mentoring and coaching engineers within the team, supporting their technical growth while encouraging collaboration, inclusion, and knowledge sharing * Keeping pace with emerging cloud, data, and application technologies, identifying opportunities to adopt relevant advancements and sharing insights across the engineering community * Ensuring solutions and engineering practices consistently support fair customer outcomes, in line with Legal & General's Customer Experience principles and Treating Customers Fairly policy ## Related Videos - [40 Minutes to Build a Serverless COVID-19 REST and GraphQL APIs](https://www.wearedevelopers.com/videos/208-40-minutes-to-build-a-serverless-covid-19-rest-and-graphql-apis) - [Protector Of The Realm](https://www.wearedevelopers.com/videos/591-protector-of-the-realm) - [Leveraging Real time data in FSIs](https://www.wearedevelopers.com/videos/806-leveraging-real-time-data-in-fsis) - [20 billion requests a week: Upgrading Twilio's API gateway at scale](https://www.wearedevelopers.com/videos/100234-20-billion-requests-a-week-upgrading-twilio-s-api-gateway-at-scale) - [30 powerful AWS hacks in just 30 minutes: Boost your developer productivity](https://www.wearedevelopers.com/videos/1624-30-powerful-aws-hacks-in-just-30-minutes-boost-your-developer-productivity) - [NoSQL Data Modeling for Front-end Developers](https://www.wearedevelopers.com/videos/297-nosql-data-modeling-for-front-end-developers) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [What Are The Top Skills Required For Azure Developers?](https://www.wearedevelopers.com/magazine/77-what-are-the-top-skills-required-for-azure-developers) - [Everything a Developer Needs to Know About MCP with Neo4j](https://www.wearedevelopers.com/magazine/604-everything-a-developer-needs-to-know-about-mcp-with-neo4j) - [The Best Software Developer Blogs to Read](https://www.wearedevelopers.com/magazine/156-the-best-software-developer-blogs-to-read)