Sinclair Lim
Software Engineer
Software engineer based in Singapore. UC San Diego CS alum building automation and SaaS platforms that turn data into decisive action. Open to opportunities worldwide.
Get in TouchWork Experience
CaliSim Seattle, WA
Full-Stack Software Engineer
Feb 2025 — Present- Led development of a distributed eSIM platform using React, Next.js, Node.js, PostgreSQL, improving service reliability for 1000+ users by reducing overall unsuccessful eSIM installations from 7% to 5%.
- Designed and implemented full automation for order fulfillment, enabling instant eSIM provisioning and fully replacing workflows that previously required a single full-time Customer Support role.
- Built and optimized backend processes and workflow engines that reduced operational overhead to under $20 monthly, eliminating all required human intervention from point of sale to fulfillment.
- Identify systemic friction points using LLM-assisted pattern analysis of customer's data, enabling more predictive automated behaviors and reducing follow-up queries from 0.8 enquiry per user to 0.5.
Mansa Holding Pte Ltd Singapore
Founding Software Engineer
Jan 2021 — Aug 2024- Designed and built the company's ERP system using Python, Supabase, AWS services, digitizing manual workflows and directly replacing a full-time Accounting role through automated reporting and operational tracking tasks company-wide, with LLM-assisted development and validation workflows.
- Automated critical logistics and back-office processes, increasing throughput for 1,800+ monthly operations while reducing manual intervention by over 40 hours to just 25 hours weekly.
- Created structured data models, standardized templates, and process maps that improved accuracy, reduced processing time, and supported future automation expansion across operational teams.
- Designed and implemented fleet-management algorithms that dynamically organized truck arrivals and unloading order, improving unloading efficiency by over 20% to more than 27 truck unloads per day.
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!
