Job Description
Senior Software Engineer (.NET/AWS)
Salary: Up to £110,000
Location: Central London (3 days per week in-office)
A leading financial services technology organisation is looking for a Senior Software Engineer to help build and evolve high-performance, cloud-native systems that underpin critical pricing and trading workflows.
This is a hands-on senior role where you'll take ownership of Back End services, influence technical direction, and mentor other engineers, all while working with modern cloud and DevOps tooling.
What you'll be doing
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Designing, building and maintaining modern .NET services in a cloud-first environment
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Developing scalable, resilient microservices running on AWS
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Working closely with product, BA and delivery teams to turn complex requirements into clean, well-structured solutions
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Driving code quality, test automation and CI/CD best practices
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Monitoring and improving system performance, reliability and security
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Supporting and mentoring engineers across the team
Tech environment (core focus)
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.NET/C# (modern versions)
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AWS (broad service usage, cloud-native design)
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SQL/relational databases (strong schema and query design required)
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Microservices architecture
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CI/CD pipelines & Git-based workflows
Nice-to-haves/big pluses
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Docker for containerisation
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Kubernetes (hands-on or strong working knowledge)
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Infrastructure as Code (eg AWS CDK, Terraform or similar)
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Experience in highly regulated or mission-critical systems
What they're looking for
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Proven experience as a Senior .NET Engineer in complex, production environments
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Strong cloud engineering mindset with real-world AWS experience
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Someone who cares about clean code, testing and long-term maintainability
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Confident communicator who can work across technical and non-technical teams
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Comfortable balancing hands-on delivery with technical leadership
Why this role?
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Technically challenging systems with real business impact
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Modern cloud stack with room to influence architecture
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Sensible hybrid working: 3 days per week in a Central London office
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Competitive salary up to £110,000 plus benefits
