Lac Tran
Senior Full-Stack Engineer
Building secure, high-performance web and mobile applications with React, TypeScript, and Node.js. Empowering developers and scaling platforms with clean architecture.
About Me
I am a senior full-stack engineer with over five years of experience designing and building secure, data-heavy web and mobile platforms in Finland. Throughout my career, I have specialized in the React, TypeScript, and Node.js ecosystems, delivering robust billing engines, automated workflow services, and standalone micro-apps. My development philosophy is centered on software reliability, strict API contract integrity, and modern developer tooling. I operate as an AI-native developer, utilizing agentic workflows to accelerate feature delivery while maintaining strict quality gates and mentoring engineering teams.
Quick Facts
Tech Stack & Skills
Crafting responsive, type-safe, and pixel-perfect user interfaces with modern state management.
Designing scalable REST APIs, microservices, and secure service integrations that power transaction-heavy systems.
Operating secure cloud infrastructures, organizing CI/CD pipelines, and writing optimized relational database schemas.
Featured Projects
Here are some of the projects I've worked on that demonstrate my technical expertise and problem-solving skills.
A full-stack + mobile platform connecting users needing small furniture moved with local drivers having spare trunk space. Features JWT-based auth, Neon Postgres database, ASP.NET Core API, Expo App, and Next.js Web client.
An intelligent agent built to streamline scheduling tasks, integrating with calendar APIs to automate appointment bookings and reminders without writing code.
Professional Experience
2021 - Present
Kassavirtanen Oy
Full-stack Software Developer
- Tech stack: React, .NET, SQL, Azure.
- Built and maintained 4 secure in -house financial products with React, .NET, and SQL, reducing bug- related support tickets by 40 %.
- Developed REST APIs in .NET used by 5 internal applications, ensuring consistent data handling and reducing duplicate logic.
- Modernized the codebase by upgrading outdated packages, refactoring modules, and standardizing dependencies, resulting in a 35 % faster response time and enhanced stability.
- Maintained and published a React Native app to Google Play Store and Apple App Store, reaching 1k + installs.
- Conducted comprehensive code reviews and facilitated technical roundtable discussions, leading to a 20 % decrease in bugs reported post - release and fostering collaborative problem - solving among development team members.
- Provided one - on - one mentorship to 10 + junior developers, resulting in a 25 % improvement in their technical skill assessments and enabling successful promotion of 3 team members within six months.
Sep 2019 - Oct 2020
Reactron Technologies Ltd
Frontend | Mobile Developer
- Tech stack: React, React Native, NodeJs, NextJs, TypeScript.
- Delivered pixel-perfect UIs for 6+ client projects, improving usability and achieving cross-browser/device consistency with less than 2% defect rate in QA.
- Partnered with UX/UI designers to convert wireframes into production-ready solutions, shortening feedback loops and accelerating feature delivery.
- Worked together with CTO and senior developers to ensure smooth MVPs shipping.
- Created a reusable component library and form templates, reducing duplicated code by 25% and increasing frontend maintainability.
- Worked with microservice-based architecture and cloud-native solutions, enabling horizontal scaling and increasing application uptime to 99.9%.
- Collaborated in peer reviews and debugging sessions, improving code quality and accelerating issue resolution time by 33%.
Get In Touch
I'm always interested in new opportunities and interesting projects. Let's talk about how we can work together.