Full Stack Engineer

Job Overview The Mid-Level Software Engineer (Full-Stack) will play a key role in building and evolving CreditXpert's 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 CreditXpert's customers. At CreditXpert, you will be part of a small team of top performers who are passionate about our core values and excited about our mission.Job MissionTo build innovative, scalable, and reliable applications that enable mortgage lenders to leverage advanced analytics for risk management and decision support, helping make homeownership more accessible and affordable through cutting-edge FinTech solutions.What you will do | Most important responsibilities of this roleREST API Development – Design, build, and maintain production-grade REST APIs that serve as the foundation of CreditXpert's 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 CreditXpert's 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 CreditXpert's 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 CreditXpert's 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.RequirementsEssential Functions:As a Mid-Level Software Engineer, Full-Stack, you will:Design and develop REST APIs and backend servicesBuild and contribute to open-source MCP servers and CLI toolingDevelop and maintain front-end features using React (~25% of role)Work as part of an agile, cross-functional engineering/product teamWrite and maintain unit testsTroubleshoot and resolve issues across AWS environments and CI/CD pipelinesMaintain and improve legacy software systemsParticipate in code reviews and contribute to a culture of engineering excellenceRequired Education and Experience 3–5 years of experience as a software engineerExperience with C# .NET Core development (OOP languages such as Java considered)Experience developing and deploying REST APIsExperience with React and front-end UI developmentExperience with SQL and relational databasesExperience writing Unit TestsFamiliarity with AWS products and tools (troubleshooting and navigation)Experience with Git-based version control (Bitbucket, GitHub, or similar) in a collaborative team environmentConceptual understanding of CI/CD pipelines and the ability to troubleshoot pipeline issuesExperience working in an Agile development environmentBachelor's degree in a technical field (Engineering, Computer Science, or equivalent)A genuine commitment to CreditXpert's mission: to make homeownership more affordable and attainable for allAdditional/Preferred Experience would include.Experience building or working with Model Context Protocol (MCP) servers — strong plusExperience with Entity Framework or similar ORM frameworks — strong plusExperience with AI/LLM integration — either building AI-powered software or delivering AI-enabled product features — strongly encouragedExperience developing CLI tooling (framework agnostic)Familiarity with AWS Lambda and AWS API GatewayExperience with OpenSearch or ElasticsearchExperience with DataDog or similar observability platformsFamiliarity with SSO, SAML, and/or OAuth authentication protocolsExperience with C++Experience coding in a secure environmentExperience with XML/JSONExperience with Atlassian tools (Jira, Confluence)Experience in a start-up environment