Principal Software Engineer

Salary: £75,000 - 95,000 per year

Requirements:

• Significant software engineering experience and a track record of delivering large-scale enterprise web applications in financial services.
• Deep experience with Java, Spring Boot and microservices, plus experience with JavaScript (React.js ideally), SQL, MongoDB, PostgreSQL, DevOps, CI/CD, test automation and Infrastructure as Code.
• Strong AWS experience, including designing and deploying secure, resilient production workloads.
• Experience designing and delivering complete digital customer journeys, including integrations, data, exception handling and operational support.
• Experience leading software development teams.
• Experience with APIs, test-driven development, automated test frameworks, code repositories, bug-tracking tools and wikis.
• Ability to translate business requirements into technical solutions and clearly explain decisions to stakeholders.
• Experience with AWS migrations, data engineering or data architecture is useful.

Responsibilities:

• Design and deliver end-to-end, full-stack digital journeys covering customer experience, APIs, integrations, data, security and production support.
• Build and improve Java and Spring Boot microservices, focusing on resilience, scalability and performance.
• Design secure, reliable AWS solutions and make informed decisions about architecture and technical trade-offs.
• Write, test and release code, using automation across build, test and deployment.
• Guide a small team of engineers and collaborate with product, business and architecture stakeholders.
• Improve existing systems through practical, measured changes rather than relying on wholesale redesign.

Technologies:

• AWS
• CI/CD
• DevOps
• Support
• Java
• JavaScript
• MongoDB
• PostgreSQL
• React
• SQL
• Security
• Spring
• Spring Boot
• Web
• microservices
• Cloud

More:

We are recruiting a Principal Software Engineer for a financial services organisation investing in its digital products and bringing more engineering in-house. This is a hands-on role focused on designing complex customer-facing digital services, writing production code and leading technical decisions across a team. The position is based in London, with hybrid working and six days onsite per month. The package is £75,000–£95,000, plus a 10% pension contribution, 10% cash allowance, bonus and benefits package.

last updated 40 week of 2026