Senior Engineer (MongoDB & AWS Serverless)

TL;DR

Senior Engineer (MongoDB & AWS Serverless): Designing and evolving cloud-native platforms using AWS serverless technologies and MongoDB with an accent on scalability, security, and high performance. Focus on reducing technical debt, implementing clean architecture, and leading the delivery of resilient microservices.

Location: Onsite in London

Company

Leading UK financial services group and major global investor focused on retirement and protection solutions.

What you will do

• Design and deliver high-quality, cloud-native serverless applications on AWS, ensuring security and scalability.
• Own the end-to-end delivery of features and systems to improve customer and business outcomes.
• Identify and resolve technical debt while applying clean code and sound architectural principles.
• Lead high-quality code reviews and define test strategies for resilience, accessibility, and security.
• Mentor and coach engineers to foster a culture of technical excellence and knowledge sharing.
• Collaborate with non-technical stakeholders to influence team culture and technical direction.

Requirements

• Strong expertise in clean architecture, design patterns, and distributed microservices.
• Proven experience with AWS serverless technologies (Lambda, API Gateway, ECS, CloudFormation).
• Deep practical experience with MongoDB, including schema design and advanced aggregation pipelines.
• Extensive experience with TDD, automated testing, CI/CD pipelines, and containerization.
• Security-first mindset with real-world experience in threat modelling and API security.
• Must be based in or able to work onsite in London.

Culture & Benefits

• Annual performance-related bonus plan and valuable share schemes.
• Generous pension contributions and life assurance.
• Healthcare plan for permanent employees.
• At least 25 days holiday plus public holidays, with options to buy or sell leave.
• Competitive family leave and tax-efficient electric car salary sacrifice scheme.
• Modern, sustainable offices designed to enhance the in-person experience.