Full-Stack Engineer · Open to Work

Building software that scales.

I create digital products from idea to launch. I focus on making them easy to use, reliable, and well-built behind the scenes. I work across design, technology, and day-to-day operations to make sure everything runs smoothly and delivers good results.

View My Work Download CV

Focus: Interfaces, systems, and delivery.
Location: Indonesia · Remote-friendly
Contact: winstencoellins13@gmail.com

Interactive Geometrylive scene

About / Profile

Engineering systems with product judgment and visual precision.

The focus is never just shipping features. It is creating systems that remain legible, adaptable, and trustworthy as teams scale.

I am a full-stack engineer who enjoys turning complex business problems into durable software systems with a clear user experience.

Across corporate teams and independent client work, I led migration efforts and system integrations, grounding decisions in a strong understanding of business workflows, and established clear code standards and a scalable blueprint for the team to follow.

My approach is shaped by engineering rigor, careful product judgment, and a belief that technical systems should feel as refined as the interfaces they power.

Signal

Years building on the web

Signal

Projects shipped to production

Signal

Cross-functional teams supported

Signal

4.9/5

Average client satisfaction

Toolkit / Systems

Technologies I Work With

I prefer tools that scale well across teams and products, but the real value comes from how the pieces are composed into maintainable systems.

Frontend

active stack

ReactTypeScriptNext.jsTailwind CSSFramer MotionZustandTanStackShadcn UI

Backend

active stack

Node.jsExpressPostgreSQLPrismaREST APIsElysia.jsFast APIDjango

DevOps

active stack

DockerCI/CDVercelRailwayGitHub ActionsObservability

Tools

active stack

FigmaNotionSlackbunStripeXenditMidtransResend

Selected Work

Products shaped for scale, clarity, and operational reality.

The strongest outcomes come from joining system thinking with interface restraint. These projects highlight that balance across operations, commerce, and analytics.

featured system

Flagship Case

Freight Forwarding System

A multi-modal freight forwarding platform that unifies shipment tracking across carriers, combining real-time event visibility with standardized data models and exception-driven logistics management.

Reduced manual errors while enabling 100% team visibility into real-time shipment status and revenue performance through a centralized freight forwarding platform.

Next.jsTypeScriptNodePostgreSQLPrismaElysia.jsRailwayTanStackShadcn UIS3 Bucket

Live Demo GitHub

Tenant Management System

A multi-tenant management system that centralized financial tracking, billing operations, and audit trails into a cohesive and transparent reporting workflow.

Next.jsElysia.jsPrismaPostgreSQLS3 BucketNodeDigital OceanShadcn UI

Quantum Sports Social & Club

Built an integrated platform that allows users to reserve courts, join clubs or groups, stay updated with event-related announcements, and manage financial records seamlessly.

Next.jsXenditPrismaPostgreSQLHono.jsS3 BucketDigital OceanShadcn UI

Chez Bakery

Developed a dynamic website integrated with a CMS, enabling the client to easily update, manage, and add bakery menus and product offerings without technical expertise.

Next.jsShadcn UIPostgreSQLS3 BucketVercel

Experience

Corporate systems and freelance delivery, running in parallel.

// corporate + freelance, simultaneously

Wilmar Consultancy Services

Full-Time

Software Engineer | Indonesia

Jul 2023 – Present

Architected and implemented a robust data migration from SQL Server to PostgreSQL, including schema conversion, ETL pipelines, and data validation to ensure integrity and zero data loss.
Led the migration from OutSystems to Next.js by defining scalable frontend architecture, modular components, and API integration strategies for improved performance and maintainability.
Engineered and maintained enterprise integrations with SAP and MuleSoft by validating APIs, troubleshooting data flows, and ensuring reliable end-to-end system synchronization.
Drove incident resolution and feature enhancements via JIRA by performing root cause analysis, debugging production issues, and collaborating with global stakeholders across multiple regions.

Active at the same time

Umify Pte Ltd

Intern to Full-Time

Full-Stack Engineer | Singapore

Oct 2022 – May 2023

Led migration from React.js to Next.js, leveraging SSR/SSG and optimized routing to significantly enhance performance and SEO.
Designed and implemented secure, scalable authentication systems with robust session and access control management.
Integrated Stripe payment processing and SendGrid email services, ensuring reliable transactions and automated user communications.
Built and launched a production-ready MVP, rapidly iterating on features based on user feedback and product validation.
Partnered with executive and technical leadership (CEO, CFO, Tech Lead) to analyze the freelancing market and drive data-informed product and engineering decisions.

Active at the same time

Collaboration For Good, Inc (Non-Profit Organization)

Full-Time

Web Developer | USA

May 2022 – Mar 2023

Developed a responsive event website for a community event in Madison, Wisconsin, USA, ensuring clean UI and smooth user experience.
Integrated and configured ExpressionEngine CMS to enable easy content updates and event information management by non-technical users.
Built and implemented page layouts and reusable frontend components based on design requirements.
Handled frontend enhancements and bug fixes to ensure usability, consistency, and site stability
Worked directly with stakeholders to translate requirements into functional web features and timely content updates

Active at the same time

Full-Time

Freelance

PT. Mitra Laju Interocean

On-Going Project

Freight Forwarding Management System | Indonesia

Mar 2026 – Present

Consulted with stakeholders to analyze Excel-based workflows and manual financial tracking, defining requirements for a unified system solution.
Identified inefficiencies in fragmented data management and proposed centralized system approaches to replace manual processes.
Translated business pain points from spreadsheet-driven operations into structured system requirements and solution designs

CherrySky Property

On-Going Project

Tenant Management System | Indonesia

Mar 2026 – Present

Collaborated with property owner to digitize manual unit leasing operations, transitioning processes into an online system for improved efficiency and accessibility.
Analyzed and redesigned manual leasing workflows, translating them into a streamlined digital platform based on stakeholder requirements.
Worked with owner to define system requirements and implement an online leasing solution to replace paper-based and manual tracking processes

Active at the same time

Quantum Sports Social & Club

Completed Project

Web App | Indonesia

Jul 2025 – Oct 2025

Consulted with a padel club owner to design an automated system for court scheduling and payments, improving operational efficiency and customer experience.
Translated business requirements into a streamlined booking and payment workflow to reduce manual scheduling overhead.
Defined and implemented system requirements for automated reservations and integrated payment handling to support business growth.

Chez Bakery

Completed Project

Content Management System | Indonesia

Jan 2025

Built a CMS-driven platform enabling the business owner to manage products, pricing, and content updates independently.
Developed a centralized content management system to streamline product catalog and pricing updates while maintaining online presence consistency
Implemented a user-friendly CMS interface allowing non-technical users to efficiently control website content and product information

Active at the same time

Wilmar Consultancy Services

Full-Time

Software Engineer | Indonesia

Jul 2023 – Present

Architected and implemented a robust data migration from SQL Server to PostgreSQL, including schema conversion, ETL pipelines, and data validation to ensure integrity and zero data loss.
Led the migration from OutSystems to Next.js by defining scalable frontend architecture, modular components, and API integration strategies for improved performance and maintainability.
Engineered and maintained enterprise integrations with SAP and MuleSoft by validating APIs, troubleshooting data flows, and ensuring reliable end-to-end system synchronization.
Drove incident resolution and feature enhancements via JIRA by performing root cause analysis, debugging production issues, and collaborating with global stakeholders across multiple regions.

Active at the same time

Umify Pte Ltd

Intern to Full-Time

Full-Stack Engineer | Singapore

Oct 2022 – May 2023

Led migration from React.js to Next.js, leveraging SSR/SSG and optimized routing to significantly enhance performance and SEO.
Designed and implemented secure, scalable authentication systems with robust session and access control management.
Integrated Stripe payment processing and SendGrid email services, ensuring reliable transactions and automated user communications.
Built and launched a production-ready MVP, rapidly iterating on features based on user feedback and product validation.
Partnered with executive and technical leadership (CEO, CFO, Tech Lead) to analyze the freelancing market and drive data-informed product and engineering decisions.

Active at the same time

Collaboration For Good, Inc (Non-Profit Organization)

Full-Time

Web Developer | USA

May 2022 – Mar 2023

Developed a responsive event website for a community event in Madison, Wisconsin, USA, ensuring clean UI and smooth user experience.
Integrated and configured ExpressionEngine CMS to enable easy content updates and event information management by non-technical users.
Built and implemented page layouts and reusable frontend components based on design requirements.
Handled frontend enhancements and bug fixes to ensure usability, consistency, and site stability
Worked directly with stakeholders to translate requirements into functional web features and timely content updates

Active at the same time

PT. Mitra Laju Interocean

On-Going Project

Freight Forwarding Management System | Indonesia

Mar 2026 – Present

Consulted with stakeholders to analyze Excel-based workflows and manual financial tracking, defining requirements for a unified system solution.
Identified inefficiencies in fragmented data management and proposed centralized system approaches to replace manual processes.
Translated business pain points from spreadsheet-driven operations into structured system requirements and solution designs

CherrySky Property

On-Going Project

Tenant Management System | Indonesia

Mar 2026 – Present

Collaborated with property owner to digitize manual unit leasing operations, transitioning processes into an online system for improved efficiency and accessibility.
Analyzed and redesigned manual leasing workflows, translating them into a streamlined digital platform based on stakeholder requirements.
Worked with owner to define system requirements and implement an online leasing solution to replace paper-based and manual tracking processes

Active at the same time

Quantum Sports Social & Club

Completed Project

Web App | Indonesia

Jul 2025 – Oct 2025

Consulted with a padel club owner to design an automated system for court scheduling and payments, improving operational efficiency and customer experience.
Translated business requirements into a streamlined booking and payment workflow to reduce manual scheduling overhead.
Defined and implemented system requirements for automated reservations and integrated payment handling to support business growth.

Chez Bakery

Completed Project

Content Management System | Indonesia

Jan 2025

Built a CMS-driven platform enabling the business owner to manage products, pricing, and content updates independently.
Developed a centralized content management system to streamline product catalog and pricing updates while maintaining online presence consistency
Implemented a user-friendly CMS interface allowing non-technical users to efficiently control website content and product information

Active at the same time

Years Corporate Experience

Freelance Clients

Projects Shipped

Contact / Build

Let’s Build Something

If you need a product-minded engineer who can move from interface decisions to backend realities without losing design discipline, let’s talk.