Senior Engineer (MongoDB) in London

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 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.

Who we’re looking for

• 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 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 an 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.

Benefits

• The opportunity to participate in our annual, performance‑related bonus plan and valuable share schemes.
• Generous pension contribution.
• Life assurance.
• Healthcare plan (permanent employees only).
• At least 25 days holiday, plus public holidays, 26 days after 2 years’ service. Option to buy and sell holiday.
• Competitive family leave.
• Participation in our electric car scheme, offering employees the option to hire a brand‑new electric car through tax‑efficient salary sacrifice (permanent employees only).
• Eligible discounts on our own products and at a range of high‑street stores and online.
• Net‑zero carbon workplaces by 2030, with sustainable, modern offices across the UK designed to foster collaboration and in‑person experience.

Additional Information

At L&G, we believe it’s possible to generate positive returns today while helping to build a better future for all. When you join us, you’ll be part of a welcoming, inclusive culture, with opportunities to collaborate with people of diverse backgrounds, views and experiences. Leaders act with integrity and care about your future and wellbeing, empowering you to develop your career and excel. We care passionately about outcomes rather than attendance and are therefore open to flexible working options including part‑time, term‑time and job shares. Some roles may have limited flexibility due to customer demand, but we accommodate requests when possible. It doesn’t matter if you don’t meet every single criterion in this advert. Instead, think about what you excel at and what else you can bring in terms of strengths, potential and connection to our purpose.