Sinclair Lim
Software Engineer
Seattle-based UC San Diego CS grad building automation, and SaaS solutions. Open to software engineer roles that turn data into decisive action.
Get in TouchWork Experience
CaliSim — Seattle, WA
Software Engineer
Feb 2025 — Present- Architected and launched a distributed eSIM marketplace serving over 10,000 users across more than 170 countries, ensuring global availability with 99.99% uptime.
- Integrated AI-powered support chat using retrieval-augmented generation and LLMs, cutting average response times from minutes to less than 5 seconds.
- Built a high-throughput schema-based routing system that scaled to over 1,300 mobile plans without reliance on a monolithic CMS.
- Designed a one-click eSIM installation flow for iOS 17.4+, reducing setup time from 12 minutes to 3 minutes and driving a 27% increase in conversion rates.
- Optimized infrastructure on Supabase and Vercel to run at less than $20 monthly, reducing operating costs by 95% compared to baseline industry solutions.
Mansa Holding Pte Ltd — Singapore
Software Engineer
Jan 2021 — Aug 2024- Engineered a lightweight ERP platform for fleet management handling over 1,800 monthly job updates, built with Python, Supabase, and AWS S3.
- Deployed computer vision models (Roboflex) for material classification at 75% accuracy, automating workflows and saving more than 160 man-hours monthly.
- Automated billing, driver tracking, and deployment pipelines, saving more than 80 man-hours weekly and reducing operational costs by 30%.
- Developed a real-time geolocation tracking system using SQL and Supabase, scaling to over 12 concurrent vehicles with latency under 100ms.
- Introduced LLM-powered developer tooling, reducing prototyping, testing, and debugging cycles.
Ministry of Defence of Singapore — Singapore
Disciplinary and Regimentation Data Analyst
Apr 2016 — Mar 2018- Consolidated and maintained 1M+ personnel records in SAP, generating data-driven policy insights that shaped regimentation guidelines across 3 military divisions.
- Applied Excel (VLOOKUP, pivot tables) to analyze disciplinary trends, producing reports that reduced repeat incidents by 15% over 2 years.
Solutions I've Built
Operations Intelligence Platform
ERP analytics suite that monitors job delays, fleet downtime, and cost drivers so waste management leaders can resolve performance issues in real time. Currently powering Ecozeal Waste Management Pte Ltd.
CaliSim Global eSIM Marketplace
Launched a live marketplace with one-click eSIM installs, automated fulfillment, and analytics coverage across 170+ countries.
Findings from Model Analysis
AI-Powered Apartment Price Forecasting
Engineered regression models and data pipelines in Python, NumPy, and Pandas to predict rental pricing from amenity-rich housing datasets.
Economic Dynamics: U.S. Money Velocity Analysis
Examined macroeconomic indicators with linear regression and block bootstrapping to explain movements in U.S. money velocity, surfacing Economic Policy Uncertainty as a key lever.
About Me
I’m a product-driven full-stack developer and data analyst who ships fast, high-impact software. From analytics pipelines to automation and SaaS platforms, I focus on getting reliable solutions into production quickly so teams see measurable business outcomes sooner, and I get the most satisfaction when data unlocks smoother workflows and sharper decisions.
Over the weekends, you can find me either at the tennis court, planespotting, or just catching up with friends at a nearby park!
