Available to hire
Hi, I’m David Melvin, a Senior Full Stack Developer with over 11 years of experience crafting high-impact products across various industries including FinTech, E-commerce, SaaS, HealthTech, and Cybersecurity. I specialize in React, Node.js, .NET Core, Laravel, and Python, and have a strong background working with cloud platforms like AWS and Azure. I enjoy delivering end-to-end solutions that are secure, performant, and scalable.
I thrive in remote work environments and love collaborating with cross-functional teams to bring great products to life. Mentoring junior developers and improving team quality is something I am passionate about. When I’m not coding, I enjoy staying up-to-date on the latest tech trends and continuously sharpening my skills.
Skills
Experience Level
Work Experience
Senior Full Stack Developer at Dark Horse
June 30, 2025 - July 18, 2025Built and maintained full-stack fintech platforms serving over 2M users monthly. Improved app load times by 40% through React optimization and efficient API architecture. Automated CI/CD with GitHub Actions, cutting deployment time by 75%. Secured REST APIs with OAuth2 and implemented strict RBAC controls. Led migration of monolithic architecture to microservices, improving team scalability and deploy times. Worked closely with product and design teams to define technical requirements and roadmap items. Mentored junior developers through code reviews and pairing sessions, raising overall team quality. Instrumented monitoring and alerting via AWS CloudWatch and Prometheus to improve system observability.
Senior Full Stack Developer at Dark Horse
June 30, 2025 - July 18, 2025Built and maintained full-stack fintech platforms serving over 2M users monthly. Improved app load times by 40% through React optimization and efficient API architecture. Automated CI/CD with GitHub Actions, cutting deployment time by 75%. Secured REST APIs with OAuth2 and implemented strict RBAC controls. Led migration of monolithic architecture to microservices, improving team scalability and deploy times. Worked closely with product and design teams to define technical requirements and roadmap items. Mentored junior developers through code reviews and pairing sessions, raising overall team quality. Instrumented monitoring and alerting via AWS CloudWatch and Prometheus to improve system observability.
Mid Senior Full Stack Developer at Roamler
April 30, 2022 - July 18, 2025Developed scalable e-commerce systems and telemedicine apps serving 500K+ monthly visitors. Enhanced backend services using Laravel, improving checkout speed by 30%. Implemented Docker and Azure CI/CD pipelines, reducing system downtime to under 0.01%. Integrated real-time APIs for telehealth services ensuring HIPAA compliance. Optimized backend queries and indexes, improving catalog load times by 45%. Wrote automated integration tests across key user flows, increasing test reliability by 70%. Built payment and inventory modules integrated with Stripe and BigCommerce APIs. Conducted regular security audits and implemented rate-limiting on public endpoints.
Mid Senior Full Stack Developer at Roamler
April 30, 2022 - July 18, 2025Developed scalable e-commerce systems and telemedicine apps serving 500K+ monthly visitors. Enhanced backend services using Laravel, improving checkout speed by 30%. Implemented Docker and Azure CI/CD pipelines, reducing system downtime to under 0.01%. Integrated real-time APIs for telehealth services ensuring HIPAA compliance. Optimized backend queries and indexes, improving catalog load times by 45%. Wrote automated integration tests across key user flows, increasing test reliability by 70%. Built payment and inventory modules integrated with Stripe and BigCommerce APIs. Conducted regular security audits and implemented rate-limiting on public endpoints.
Full Stack Developer at Nortal
September 30, 2021 - July 18, 2025Created content-streaming platforms handling peak loads of 1M concurrent users. Built cybersecurity dashboards for real-time threat monitoring reducing incident response time by 60%. Used Redis caching and Kubernetes clusters to achieve sub-50ms latency. Improved platform scalability via microservices architecture in Node.js and Python. Designed and deployed analytics modules to measure engagement and platform usage. Wrote GraphQL APIs to support real-time metrics and user customization features. Created automated backup and restore scripts for MongoDB and Redis environments. Collaborated with DevOps to optimize Kubernetes clusters for CI/CD environments.
Full Stack Developer at Nortal
September 30, 2021 - July 18, 2025Created content-streaming platforms handling peak loads of 1M concurrent users. Built cybersecurity dashboards for real-time threat monitoring reducing incident response time by 60%. Used Redis caching and Kubernetes clusters to achieve sub-50ms latency. Improved platform scalability via microservices architecture in Node.js and Python. Designed and deployed analytics modules to measure engagement and platform usage. Wrote GraphQL APIs to support real-time metrics and user customization features. Created automated backup and restore scripts for MongoDB and Redis environments. Collaborated with DevOps to optimize Kubernetes clusters for CI/CD environments.
Web Developer at Concise Systems
May 31, 2018 - July 18, 2025Developed interactive LMS platforms supporting 150K+ students annually. Improved platform engagement by 50% with real-time features using Firebase. Automated ad campaign analytics and reporting tools saving 20+ hours weekly. Ensured responsive UI across all platforms with Vue.js, reducing bounce rates by 35%. Developed visual reporting dashboards with Chart.js and D3.js for real-time campaign data. Converted legacy jQuery codebase into Vue.js with Vuex, improving maintainability. Refactored components to increase Lighthouse scores and mobile usability. Deployed micro-frontends architecture to separate student/teacher portals in EdTech suite.
Web Developer at Concise Systems
May 31, 2018 - July 18, 2025Developed interactive LMS platforms supporting 150K+ students annually. Improved platform engagement by 50% with real-time features using Firebase. Automated ad campaign analytics and reporting tools saving 20+ hours weekly. Ensured responsive UI across all platforms with Vue.js, reducing bounce rates by 35%. Developed visual reporting dashboards with Chart.js and D3.js for real-time campaign data. Converted legacy jQuery codebase into Vue.js with Vuex, improving maintainability. Refactored components to increase Lighthouse scores and mobile usability. Deployed micro-frontends architecture to separate student/teacher portals in EdTech suite.
Education
Bachelor of Computer Science at Tallinn University of Technology
September 1, 2011 - October 31, 2015Bachelor of Computer Science at Tallinn University of Technology
September 1, 2011 - October 31, 2015Qualifications
Industry Experience
Software & Internet, Financial Services, Retail, Healthcare, Media & Entertainment
Skills
Experience Level
Hire a Full Stack Developer
We have the best full stack developer experts on Twine. Hire a full stack developer in Tallinn today.