Mid level C#.Net Engineer with AI and AWS

This position is HYBRID with in office a minimum of 2 days/week.

Our client is looking for a sharp motivated full-stack engineer. You wont get lost in a sprawling org chart or buried in meetings. Youll be part of a small team of top performers who own their work end-to-end ship things that matter and push each other to grow.

Heres what makes this role different:

• Design and ship production-grade REST APIs at the core of our platform strategy
• Contribute to open-source MCP servers and CLI tooling with real external reach
• Work in a purposeful well-supported stack: C# .NET Core React AWS
• Bring your curiosity about AI/LLM and agentic frameworks to a team actively building in that space (we use Claude Code daily)
• Do it all in service of a mission that genuinely improves peoples financial lives

Job Overview

The Mid-Level Software Engineer (Full-Stack) will play a key role in building and evolving the product ecosystem. Operating with a high degree of autonomy within a supportive mentor/mentee relationship with their Technical Lead this engineer will be instrumental in designing and delivering robust REST APIs contributing to agentic tooling and advancing workflow capabilities and user experience for their customers. You will be part of a small team of top performers who are passionate about our core values and excited about our mission.

What you will do Most important responsibilities of this role

• REST API Development Design build and maintain production-grade REST APIs that serve as the foundation of companys API-first strategy.
• Agentic & Developer Tooling Contribute to the development and release of Model Context Protocol (MCP) servers and CLI tooling designed to help customers rapidly integrate and adopt the companys API.
• Full-Stack Feature Development Develop and maintain full-stack features using C# .NET Core on the backend and React on the front end ensuring high quality across approximately 75% backend/API and 25% front-end work.
• Software Maintenance & Iteration Maintain and enhance legacy software systems while contributing to new feature development ensuring sustained performance and alignment with business needs.
• Agile Collaboration Work closely within the Engineering/Product organization in an agile environment collaborating with product managers senior engineers and the Technical Lead to deliver high-quality solutions.
• Quality Assurance & Testing Write and execute unit tests to ensure code stability reliability and performance.
• Continuous Learning Stay current with emerging technologies including AI/LLM tooling agentic frameworks and cloud-native development practices and bring forward innovative approaches to product and tooling challenges.

How you will do it The ideal hire will

• Backend & API Excellence Leverage deep expertise in C# .NET Core (and/or comparable OOP languages such as Java) to build reliable maintainable backend services and REST APIs integrated with SQL relational databases.
• Open-Source Developer Experience Contribute to the design and distribution of MCP servers and CLI tools as open-source software enabling external customers to accelerate their adoption of API platform.
• Cloud Fluency Work confidently within AWS environments navigating AWS products services and tooling to troubleshoot issues and support operational needs.
• Version Control & CI/CD Awareness Use Git-based version control tools (Bitbucket GitHub or similar) effectively for collaborative team-based development with an understanding of CI/CD concepts sufficient to identify and help resolve pipeline issues.
• AI/LLM Orientation Bring curiosity and practical experience with AI/LLM technologies whether in building AI-powered features or integrating LLM capabilities into software products to help drive agentic roadmap forward. Our engineering team actively uses Claude Code.
• Autonomous Yet Collaborative Thrive in a high-autonomy mentor/mentee dynamic taking ownership of work while leveraging the Technical Lead and senior team members for guidance and growth.

Requirements

Essential Functions:

As a Mid-Level Software Engineer Full-Stack you will:

• Design and develop REST APIs and backend services
• Build and contribute to open-source MCP servers and CLI tooling
• Develop and maintain front-end features using React (25% of role)
• Work as part of an agile cross-functional engineering/product team
• Write and maintain unit tests
• Troubleshoot and resolve issues across AWS environments and CI/CD pipelines
• Maintain and improve legacy software systems
• Participate in code reviews and contribute to a culture of engineering excellence

Required Education and Experience

• 35 years of experience as a software engineer
• Experience with C# .NET Core development (OOP languages such as Java considered)
• Experience developing and deploying REST APIs
• Experience with React and front-end UI development
• Experience with SQL and relational databases
• Experience writing Unit Tests
• Familiarity with AWS products and tools (troubleshooting and navigation)
• Experience with Git-based version control (Bitbucket GitHub or similar) in a collaborative team environment
• Conceptual understanding of CI/CD pipelines and the ability to troubleshoot pipeline issues
• Experience working in an Agile development environment
• Bachelors degree in a technical field (Engineering Computer Science or equivalent)
  
  

Additional/Preferred Experience would include.

• Experience building or working with Model Context Protocol (MCP) servers strong plus
• Experience with Entity Framework or similar ORM frameworks strong plus
• Experience with AI/LLM integration either building AI-powered software or delivering AI-enabled product features strongly encouraged
• Experience developing CLI tooling (framework agnostic)
• Familiarity with AWS Lambda and AWS API Gateway
• Experience with OpenSearch or Elasticsearch
• Experience with DataDog or similar observability platforms
• Familiarity with SSO SAML and/or OAuth authentication protocols
• Experience with C
• Experience coding in a secure environment
• Experience with XML/JSON
• Experience with Atlassian tools (Jira Confluence)
• Experience in a start-up environment

Required Experience:

Manager