Ronan Doyle
Full Stack Engineer with 8+ years of experience building scalable, high-performance web applications across fintech, healthtech, and developer tooling.
About
Full Stack Engineer with 8+ years of experience building scalable, high-performance web applications across fintech, healthtech, and developer tooling. Strong focus on secure authentication, clean architecture, and scalable system design in regulated, data-intensive environments.
Experienced delivering robust backend services and responsive frontend interfaces using Node.js, Python, React, Next.js, and TypeScript, including production integrations for data pipelines, analytics systems, and AI-driven features. Comfortable working independently in remote contract settings while collaborating effectively with global cross-functional teams.
- 13 years' experience
- Joined April 2026
Industry experience
- Software & Internet
- Healthcare
- Financial Services
- Agriculture & Mining
- Professional Services
Work experience· 6 roles
Designed and developed scalable backend services using Node.js and TypeScript, integrated with PostgreSQL and GraphQL to optimize data modeling and queries. Developed services using Python (FastAPI) and C# for tools, handling business logic and API design for Fintech applications. Built and optimized RESTful APIs and WebSocket-based real-time communication for seamless user interactions. Integrated STT functionality for real-time voice-to-text conversion to enhance user experience. Collaborated with frontend teams to deliver high-quality, responsive UIs using React. Applied Redis caching to reduce latency and accelerate API response times by 35%. Participated in DevOps engineering to implement CI/CD pipelines using GitLab CI and Docker, improving deployment efficiency and reducing release cycles by 20%.
Optimized payment processing workflows using REST APIs, improving transaction throughput by 25% while ensuring financial compliance and data integrity across banking systems. Led cross-functional efforts with product, QA, and DevOps teams to deliver scalable fintech solutions. Remote role.
Delivered secure API integrations and backend features for healthcare/telemedicine platforms, enabling HL7 v2 and FHIR interoperability and improving data exchange accuracy.
Education· 5
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