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Hi, I’m John William Lim, a senior software engineer with 9 years of experience building full-stack web and mobile applications. I have deep hands-on work with React Native, React, Node.js, TypeScript, FastAPI, PostgreSQL, and AWS-based delivery, and I’ve led MVPs, backend APIs, and AI-enabled features across diverse client projects. I’m comfortable shipping end-to-end, optimizing performance, and collaborating with cross-functional teams to turn ideas into scalable products. I’m especially interested in EdTech-style platforms that require personalized user flows, AI integration, robust documentation, and clear ownership from requirements through release. I thrive in fast-paced environments where thoughtful architecture, measurable impact, and reliable delivery matter.…Hi, I’m John William Lim, a senior software engineer with 9 years of experience building full-stack web and mobile applications. I have deep hands-on work with React Native, React, Node.js, TypeScript, FastAPI, PostgreSQL, and AWS-based delivery, and I’ve led MVPs, backend APIs, and AI-enabled features across diverse client projects. I’m comfortable shipping end-to-end, optimizing performance, and collaborating with cross-functional teams to turn ideas into scalable products. I’m especially interested in EdTech-style platforms that require personalized user flows, AI integration, robust documentation, and clear ownership from requirements through release. I thrive in fast-paced environments where thoughtful architecture, measurable impact, and reliable delivery matter.

John William Lim

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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Hi, I’m John William Lim, a senior software engineer with 9 years of experience building full-stack web and mobile applications. I have deep hands-on work with React Native, React, Node.js, TypeScript, FastAPI, PostgreSQL, and AWS-based delivery, and I’ve led MVPs, backend APIs, and AI-enabled features across diverse client projects. I’m comfortable shipping end-to-end, optimizing performance, and collaborating with cross-functional teams to turn ideas into scalable products. I’m especially interested in EdTech-style platforms that require personalized user flows, AI integration, robust documentation, and clear ownership from requirements through release. I thrive in fast-paced environments where thoughtful architecture, measurable impact, and reliable delivery matter.…Hi, I’m John William Lim, a senior software engineer with 9 years of experience building full-stack web and mobile applications. I have deep hands-on work with React Native, React, Node.js, TypeScript, FastAPI, PostgreSQL, and AWS-based delivery, and I’ve led MVPs, backend APIs, and AI-enabled features across diverse client projects. I’m comfortable shipping end-to-end, optimizing performance, and collaborating with cross-functional teams to turn ideas into scalable products. I’m especially interested in EdTech-style platforms that require personalized user flows, AI integration, robust documentation, and clear ownership from requirements through release. I thrive in fast-paced environments where thoughtful architecture, measurable impact, and reliable delivery matter.

Available to hire

Hi, I’m John William Lim, a senior software engineer with 9 years of experience building full-stack web and mobile applications. I have deep hands-on work with React Native, React, Node.js, TypeScript, FastAPI, PostgreSQL, and AWS-based delivery, and I’ve led MVPs, backend APIs, and AI-enabled features across diverse client projects. I’m comfortable shipping end-to-end, optimizing performance, and collaborating with cross-functional teams to turn ideas into scalable products.

I’m especially interested in EdTech-style platforms that require personalized user flows, AI integration, robust documentation, and clear ownership from requirements through release. I thrive in fast-paced environments where thoughtful architecture, measurable impact, and reliable delivery matter.

Skills

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Work Experience

Senior Software Engineer at Slalom

March 1, 2023 - Present

Built and deployed MVP-style full-stack applications for client engagements using React Native, React, Node.js, TypeScript, FastAPI, PostgreSQL, and AWS; designed backend services and REST APIs for personalized workflows, progress tracking, reminders, and analytics dashboards across mobile-first products; integrated AI-powered features to generate recommendations and content summaries; implemented AWS S3-based storage workflows for user-generated content; improved API response times by ~18% through query optimization and caching; increased release speed by ~30% by standardizing CI/CD pipelines and deployment practices; partnered with stakeholders to refine MVP scope and align delivery milestones with product goals.

Full Stack Developer at Kitrum

July 1, 2021 - February 28, 2023

Developed cross-platform product features with React Native and React for mobile and web, emphasizing clean UX, performance, and reusable TypeScript components; built Node.js and FastAPI backends for scheduling, notifications, user profiles, content delivery, and analytics-heavy workflows; integrated third-party AI and automation APIs to support personalized recommendations, content categorization, and insights; created dashboards and reporting features to surface engagement trends and metrics; improved mobile screen load times by 25% through bundle optimization and state management improvements; raised backend throughput during peak usage by ~20% via asynchronous job handling and DB access optimizations; produced comprehensive technical documentation to enable handoffs and future iterations.

Backend Developer at NCS

September 1, 2019 - December 1, 2020

Built backend services for document ingestion, OCR, metadata extraction, and compliance workflows; developed asynchronous pipelines using Kafka, Celery, and Redis for large-scale document processing; created secure APIs and Elasticsearch-based search services for multi-tenant document workflows.

Junior Software Developer at Shopee

December 1, 2017 - September 1, 2019

Built backend services and APIs for AI-powered features and internal automation tools; improved pre-processing, validation, and error handling to enhance reliability of production workflows.