Senior Full Stack .Net Developer

1 week ago

Cape Town, Western Cape, South Africa Ada Meher Full time R1 200 000 - R1 800 000 per year

Senior Full Stack Developer - Stellenbosch, Remote - R115,000 CTC

I am partnered with a conversational voice intelligence company who are leveraging AI and LLMs to enhance their service offerings and enhance their customers' experience. They were established over seven years ago and have progressed through start-up phase and established a widespread client base; they are looking to continue to grow. They focus on efficiency without sacrificing on quality and are looking for a forward-thinking engineer who can drive technology innovation as they scale.

In this role, you will manage end-to-end delivery across a global SaaS stack; designing and building .Net Core services, creating data models, shipping quality front-end's and working extensively with AWS. You will also play a key role in assisting with the leverage of LLMs to deliver value to customers.

Responsibilities

  • Design and build robust ASP.NET Core REST APIs with OpenAPI/Swagger that developers love to use.
  • Model and optimise SQL databases for both transactional and analytical workloads.
  • Deliver product features end-to-end across TypeScript + Aurelia (React/Angular experience also transfers well) and .NET services.
  • Architect, build, and operate workloads on AWS (ECS Fargate, Lambda, S3, RDS/Aurora, API Gateway, etc.) using Well-Architected principles.
  • Contribute to containerisation and orchestration with Docker and Kubernetes, focusing on maintainability and observability.
  • Implement secure authentication/authorisation (OIDC/OAuth2) and champion secure coding practices.
  • Monitor and improve performance with OpenTelemetry, Grafana, and CloudWatch.
  • Automate everything — CI/CD, IaC (AWS CDK in C#), testing, and quality gates.
  • Collaborate closely with product and design teams, participate in code reviews, and take features from idea to production.
  • Experiment with LLMs and applied ML to drive real user and business value.

Tech Stack

  • Backend:
    C#/.NET 8+, ASP.NET Core, EF Core, OpenAPI
  • Data:
    SQL, OLTP/OLAP modelling, caching and queuing
  • Cloud & Infra:
    AWS (ECS Fargate, Lambda, SQS/SNS/EventBridge, S3, RDS/Aurora, API Gateway/ALB, IAM, etc.), IaC (AWS CDK – C#), Docker, Kubernetes (EKS a plus)
  • Frontend:
    TypeScript, Aurelia (React/Angular welcome), modern tooling and testing
  • Security:
    OIDC/OAuth2, OWASP Top 10, OpenTelemetry, Grafana, CloudWatch
  • AI/LLMs:
    OpenAI, Bedrock, Anthropic, embeddings/vector search, prompt shaping

Requirements

  • 5+ years of hands-on experience building production software with ownership of backend services and customer-facing features.
  • Strong .NET Core background with excellent API design instincts.
  • Deep SQL skills (query tuning, indexing, schema design).
  • Proven experience deploying and running applications on AWS at scale.
  • Hands-on Kubernetes knowledge (deploying, debugging, operating).
  • Front-end experience with TypeScript and a modern framework (Aurelia, React, or Angular).
  • Solid understanding of secure coding and ability to address OWASP Top 10 issues.
  • Strong communication, product awareness, and a proactive mindset.

Nice to Haves

  • In-depth OIDC/OAuth2 knowledge (Auth code, PKCE, token lifecycles, scopes/claims).
  • Experience with event-driven architectures (Kafka, Redpanda) or analytics pipelines.
  • Practical experience integrating LLMs in production or developer workflows.
  • Understanding of multi-tenant SaaS, privacy by design, and GDPR/POPIA compliance.

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