07/14/2025 updated

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Senior Full-Stack Engineer with 12+ years experience in web development

Kingston Springs, USA Bachelor of Science in Computer Science
Kingston Springs, USA Bachelor of Science in Computer Science

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Devin Leonard.docx

I’m a Senior Full-Stack Engineer with over 12 years of experience in software development, specializing in backend systems, cloud computing, and web/mobile applications. I have worked across diverse industries including healthcare, fintech, and eCommerce, which has given me a solid foundation in both high-performance, scalable systems and user-centric design.

My expertise lies in developing robust backend services using technologies like Java, Node.js, and Python, coupled with deep knowledge of microservices architectures and cloud platforms. At One Medical, I led the migration of critical services from a monolithic architecture to a more flexible and scalable microservices-based system, allowing the platform to handle an ever-growing user base while maintaining high availability and performance. I’ve designed and deployed cloud-native applications using services from AWS, GCP, and Azure, ensuring the solution is both cost-effective and highly scalable.

On the front-end, I have extensive experience with React, React Native, Angular, and Vue.js, allowing me to craft responsive, interactive UIs that deliver seamless user experiences across devices. I’ve built applications with state-of-the-art frameworks like Redux and MobX, ensuring state management is efficient and the UI reacts optimally to user interactions. I also have hands-on experience with CSS frameworks such as Tailwind CSS, MUI, and Ant Design, which I use to deliver consistent and responsive design systems across platforms.

In terms of database management, I’m proficient in working with both relational databases such as MySQL, PostgreSQL, and Oracle, and NoSQL databases like MongoDB, Cassandra, and DynamoDB. I’ve designed data models, implemented ETL processes, and set up data replication and sharding strategies to optimize for both read and write performance.

I’m passionate about DevOps practices and have used Docker and Kubernetes for containerization and orchestration. This helps streamline deployments, reduce environment discrepancies, and improve overall system reliability. I’m also proficient with CI/CD pipelines using Jenkins, GitLab CI, and GitHub Actions, ensuring fast and reliable code integration and delivery.

In my leadership roles, I’ve mentored and guided junior developers, helping them build strong foundations in coding best practices, unit testing, and performance optimization. I have a strong track record of driving projects to completion by ensuring clear communication, effective collaboration, and rigorous code review processes. I led teams in agile environments, conducting sprint planning, standups, and retrospectives to ensure timely delivery of high-quality software.

One of my most fulfilling experiences was working on the development of a tele-health platform at One Medical, where I led the implementation of real-time video calls using WebRTC. The challenge was to provide low-latency video communication while integrating with backend services built in C#, and I collaborated closely with cross-functional teams to ensure smooth deployment and continuous improvements.

Overall, my technical expertise, problem-solving ability, and leadership experience make me well-equipped to handle complex projects. I bring a comprehensive understanding of both frontend and backend technologies, a passion for scalable architecture, and a collaborative mindset to any project. Whether leading teams, architecting systems, or developing user interfaces, I always focus on delivering value and maintaining the highest standards of software quality.

Languages

EnglishNative speaker

Project history

Senior Full Stack Engineer

One Medical
Spearheaded development of tele-health platforms with JavaScript/TypeScript and React/Redux. Built chatbot solutions with NLP capabilities, created Elasticsearch infrastructure, and migrated from monolithic to microservices architecture using AWS services.

Full-Stack Developer

Nimap Infotech
Developed fintech platform using MERN stack with focus on high-performance financial services. Implemented PCI-DSS-compliant payment processing with Stripe and PayPal APIs, and created responsive UI with React and CSS-in-JS libraries.

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