Principal .NET Developer - Capital Markets

Location: London (Hybrid) | Practice Area: Technology & Engineering | Type: Permanent

As a Principal .NET Developer at Capco, you’ll architect and lead the delivery of enterprise-scale platforms for our global capital markets clients. Leveraging modern cloud technologies and a deep understanding of financial products and processes, you’ll deliver scalable, secure, and high-performing applications. You’ll also play a leadership role in mentoring engineering teams and supporting Capco’s broader technical capability.

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  Design and build enterprise-grade .NET solutions for capital markets platforms

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  Implement scalable, event-driven systems using modern cloud-native architectures

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  Apply engineering best practices including SOLID principles, TDD, and CI/CD pipelines

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  Collaborate with stakeholders and mentor teams to ensure project success

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  Lead platform architecture discussions, focusing on secure, maintainable solutions

• Proficiency in C# (7.0/8.0) & .NET with a background in building enterprise systems in capital markets

• Strong understanding of trade lifecycle processes and financial instruments (Options, Derivatives, Rates)

• Experience with SQL Server and/or NoSQL solutions; performance tuning and design

• Expertise in AWS (DocumentDB, EKS, EC2, S3, Aurora, CloudFront, Route 53)

• Experience with caching layers like Redis or Elasticache and scalable API design (REST/GraphQL)

• Passion for mentoring and contributing to the wider Capco engineering community

• Experience leading client engagements and supporting RFPs or technical pre-sales

• Familiarity with regulatory and compliance aspects in banking environments

• Knowledge of secure design standards and software development lifecycle best practices

• Strong communication skills to engage with business and technical stakeholders