Full Stack Developer

Investec Sandton is looking for a highly skilled .NET Engineer to join our Client Digital Experience team. This team is responsible for building and maintaining externally facing APIs that power Investec's UK Open Banking ecosystem — enabling clients and partners to securely share data, initiate payments, and integrate with regulated providers across the financial industry. You will play a key role in designing, developing, and supporting financial-grade APIs that demand the highest levels of security, reliability, and performance. This is an opportunity to contribute to a high-impact platform that underpins our client-facing digital experiences. This role suits someone who thrives on technical excellence, accountability, and real-world impact. It's a space where robust engineering meets the fast-evolving world of open finance What you’ll do Design, develop, and maintain secure, scalable, and high-performance REST APIs using C# and .NET Core / .NET Framework. Implement OAuth2 and OpenID Connect (OIDC) for secure authentication and authorization in regulated environments. Work closely with API gateways such as Apigee and Azure API Management (APIM) to manage, secure, and monitor external-facing APIs. Collaborate with product and cloud teams to ensure systems meet financial-grade security and compliance standards. Take ownership across the full SDLC — from design and deployment to production support and monitoring. Participate in a rotational standby schedule to support the stability of client-facing systems outside of normal working hours. Work across the stack where needed — from front-end SPAs (Angular / React) to infrastructure-as-code and CI / CD pipelines. Continuously drive improvement in API quality, resilience, and developer experience. Essential Experience Proven experience in building and supporting RESTful APIs using C# and .NET Core / .NET Framework. Strong grasp of API security principles including OAuth2, OIDC, token management, and data protection. Familiarity with Apigee, Azure API Management (APIM), or equivalent API gateway technologies. Experience with unit and integration testing, using frameworks that ensure coverage and maintainability. Front-end exposure to Angular, React, or similar SPA frameworks. Understanding of the Document Object Model (DOM) and modern UI development best practices. Advantageous Experience Hands-on experience working with Microsoft Azure infrastructure. Proficiency with HTML, CSS, JavaScript, and Bootstrap. Familiarity with Terraform, ARM, or Bicep for infrastructure provisioning. Experience with document store databases (MongoDB, Cosmos DB). Knowledge of PowerShell scripting for automation. Exposure to regulated financial environments or Open Banking ecosystems. Awareness of how to leverage AI tools responsibly (for code generation, analysis, documentation, or testing) to enhance productivity and software quality. Why join us Contribute to a mission‑critical Open Banking platform used by real clients every day. Collaborate with expert engineers and product teams across South Africa and the UK. Be part of a culture that values excellence, creativity, and responsibility. Have opportunities to influence architecture, improve developer tooling, and shape our next generation of financial APIs. Enjoy meaningful challenges and the satisfaction of building systems that matter. What We Value At Investec we seek creative, talented people with passion, energy and stamina, who collaborate unselfishly. We are committed to diversity and inclusion when recruiting internally and externally. #J-18808-Ljbffr