Senior Software Engineer — AWS Serverless & MongoDB

LegalAndGeneral; City Of London; On-site; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Annual bonus

Share schemes

Healthcare plan

27 days holiday

Cashback & discounts

Job summary

Legal & General in London is seeking a Senior Software Engineer to design, build, and evolve cloud-native platforms. You will lead end-to-end delivery, champion clean code and secure best practices, and shape technical direction within an agile environment.

You will own serverless AWS solutions (Lambda, API Gateway, ECS), apply scalable patterns, mentor engineers, and drive debt reduction while ensuring customer-focused outcomes and operational excellence.

Qualifications

• 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 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.

Responsibilities

• 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.

Skills

Clean code

Clean architecture

Distributed systems

Microservices

Cloud-native

AWS

MongoDB

SQL

NoSQL

TDD

CI/CD

Containerisation

Security-first

Tools

CloudFormation

Serverless Framework

Job description

Legal & General in London is seeking a Senior Software Engineer to design, build, and evolve cloud-native platforms. You will lead end-to-end delivery, champion clean code and secure best practices, and shape technical direction within an agile environment.

You will own serverless AWS solutions (Lambda, API Gateway, ECS), apply scalable patterns, mentor engineers, and drive debt reduction while ensuring customer-focused outcomes and operational excellence.