Winsten Coellins

Hello, I'm Winsten Coellins

Fullstack Software Engineer

Fullstack software engineer building products end to end.

I develop reliable software from concept through launch—focused on clear architecture, thoughtful user experiences, and outcomes teams can measure and trust.

Experience

Software Engineer

Wilmar Consultancy Services · Present

Leading and mentoring teams in the migration of enterprise applications from OutSystems to a modern Next.js and NestJS architecture, leveraging AI-assisted development to accelerate delivery, enhance code quality, and improve scalability and maintainability.

Fullstack Software Engineer

Umify Pte Ltd · 2022 - 2023

Promoted from Intern to Software Engineer in recognition of strong technical contributions and performance, including leading the development and delivery of an MVP that enabled a successful project launch and accelerated time-to-market.

Web Developer

Collaboration For Good, Inc. · 2023 - 2023

Designed and developed a responsive event website using HTML, CSS, and JavaScript to support one of Madison’s largest community events, enhancing attendee engagement and access to event information.

IT Assistant

University of Wisconsin-Madison · 2022 - 2023

Established a barcode scanning system to optimize item check-in and check-out workflows, while developing accessible web solutions using semantic HTML to ensure accurate screen-reader support for students with disabilities.

Freelance Projects

My Tech Stack

Key Technologies & Platforms

I work with modern frameworks, languages, and cloud platforms to build reliable full-stack applications—from polished interfaces and APIs to authentication, databases, and production deployment.

Next.js logo
React logo
Tailwind CSS logo
Zustand logo
HTML5 logo
CSS3 logo
JavaScript logo
TypeScript logo
Python logo
FastAPI logo
Django logo
Elysia logo
Express logo
Node.js logo
Better Auth logo
PostgreSQL logo
Prisma logo
Bun logo
NestJS logo
Docker logo
AWS logo
Vercel logo
Railway logo
DigitalOcean logo
Redis logo
MongoDB logo
GraphQL logo
Git logo
GitHub logo

Selected Projects

Freight Forwarding System
Logistics

Freight Forwarding System

A freight forwarding system is a logistics platform that manages shipment bookings, documentation, tracking, and customs processes, with role-based user authorization to control access for admins, operators, customers, and agents.

Court Scheduling System
Sports & Recreation

Court Scheduling System

A court scheduling system is a web-based platform that allows users to book courts, make online payments, and manage reservations, while providing administrators with a dashboard for scheduling management, bookkeeping, payment tracking, and business analytics.

Property Management System
Real Estate

Property Management System

A Property Management System is a centralized platform that enables landlords and property managers to manage properties, units, tenant leases, rent collection, bookkeeping, maintenance requests, and occupancy records, while allowing tenants to log in, view their lease details, make payments, and submit lease renewal requests online.

Education Management System
Education

Education Management System

An Education Management System is an end-to-end solution for managing courses, student enrollment, teacher scheduling, lesson delivery, payroll calculations, financial records, performance tracking, and marketing commissions within a single integrated platform.

Content Management System (CMS)
Marketing

Content Management System (CMS)

A Content Management System is a platform that allows business owners to manage menu categories and menu items through an admin dashboard, automatically organizing and displaying them on a public-facing website for customers to browse.

Corporate Website
Industrial Trading & Sourcing Company

Corporate Website

A corporate landing page that showcases Chinergy Shenindo's company profile, services, products, projects, and contact information, helping potential clients learn about the business and connect for inquiries or partnerships.

Let's Build Something Together

Open to full-time roles, contract work, and collaborations on web apps, APIs, and data-driven products.