Skip to content
W
ENID
Open for freelance and Software Developer roles

Hello, I'm William Sugiarto

I build digital products that feel clear and useful.

I design and build thoughtful digital products with a focus on accessible interfaces, reliable systems, and measurable outcomes. Informatics graduate turning ideas into production-minded, dependable software.

View selected work
Focus
Web products
Based in
Indonesia
Learning
Every day
William Sugiarto

About me

Curiosity, translated into working software.

I'm an Informatics graduate who enjoys the space between a rough idea and a dependable product. I care about understanding the real problem, shaping an interface people can navigate, and writing code that another developer can confidently continue.

My current focus is modern frontend development with React, TypeScript, and thoughtful design systems. Along the way I'm strengthening the fundamentals that make those tools useful: accessibility, data structures, APIs, databases, and testing.

Accessible by default
Responsive at every size
Typed and tested
Clear before clever

Capabilities

Languages, tools, and practices for building useful software.

A broad Informatics foundation across programming, interface development, backend systems, databases, and collaborative engineering workflows.

01

Languages

Programming foundations for web, mobile, data, and software development.

  • JavaScript
  • TypeScript
  • Python
  • Java
  • C/C++
  • Dart
  • SQL
02

Frontend & Mobile

Building responsive interfaces across browsers and mobile devices.

  • HTML
  • CSS
  • React
  • Next.js
  • Tailwind CSS
  • Flutter
03

Backend & Data

Connecting products to APIs, databases, and dependable data flows.

  • Node.js
  • Express
  • REST APIs
  • PostgreSQL
  • MySQL
  • Firebase
04

Tools & Practices

Working with the tools and habits used to ship maintainable software.

  • Git & GitHub
  • Testing
  • Linux
  • Docker
  • Figma
  • Accessibility

Selected work

Projects with a story behind the pixels.

Each case study captures the problem, the decisions, and what I learned—not just the final screen.

All projects
Panther Consultation sign-in page with the Konsultasi dengan Ahli, Dari Mana Saja! tagline above a dark Sign In card

Membership & legal consultation platform

Panther Consultation

A web-based platform that pairs a member portal with an admin back-office for legal consultations, membership management, and automated email reminders.

  • React
  • TypeScript
  • Node.js
  • MySQL
Karyanusa landing page hero with the Temukan Kekayaan Budaya Indonesia headline, gamification highlights, and a Mulai Jelajahi call to action

Cultural heritage documentation platform

Karyanusa

A cross-platform crowdsourcing app that invites the public to document, verify, and preserve Indonesian cultural heritage.

  • Flutter
  • Node.js
  • PostgreSQL
  • Supabase
  • Gemini API
Toko Mebel dashboard showing inventory rows, monthly revenue, invoices, and a production run

Furniture store management system

Toko Mebel

A management web app that keeps furniture production, inventory, invoices, and reporting in one secure, role-aware workspace.

  • React
  • TypeScript
  • Vite
  • Material UI
  • Redux
  • React Hook Form
  • Joi
AFC Landing Page hero with the Menuju Sehat Menyeluruh headline, product cards for SOP Subarashi, Utsukushhii, Hikari, and Sensei Suru, and a WhatsApp help button

Japanese health supplement landing page

AFC Landing Page

The official distributor landing page for AFC Life Science Indonesia's Japanese supplements—trust-first design, PHP-driven React hydration, and a WhatsApp-only conversion flow.

  • React
  • Tailwind CSS
  • PHP
  • Vite
  • Vitest

Experience

Learning in public and contributing along the way.

A snapshot of where I've applied my skills so far and the kind of work I care about continuing.

2026

Freelance Full-stack Developer

AFC Life Science Indonesia

Built the official distributor landing page for Japanese health supplements as part of an enterprise omnichannel AI ecosystem.

  • Shipped a trust-first design system and PHP-driven React hydration with database-managed content.
  • Engineered a WhatsApp-only conversion flow while holding WCAG AA across Japanese and Indonesian copy.

2025

Freelance Full-stack Developer

Panther Consultation

Delivered a web-based membership and legal consultation platform with a member portal and admin back-office.

  • Built consultation and complaint ticketing, appointment booking, and promo/referral management.
  • Automated membership expiry and document deadline email reminders now running in production.

Aug 2024 — 2026

Senior Laboratory Assistant

ISTTS

Led laboratory assistance for informatics practicums at ISTTS.

  • Tutored PHP/Laravel, React, and Electron and created weekly exams for 30+ students.
  • Managed practicum operations and course materials across semesters.

Aug 2023 — Jul 2024

Junior Laboratory Assistant

ISTTS

Assisted informatics practicums and student assessment at ISTTS.

  • Assisted practicum management for programming courses.
  • Designed and evaluated quizzes to assess student understanding.

Feb 2023 — Feb 2024

Event Department Member

Informatics Student Association

Organized campus events and competitions for the informatics student association.

  • Organized coding contests and seminars for students.
  • Coordinated the End Academic Camp and Top Coder Competition, engaging 60+ students.

Education

Bachelor of Informatics

Institut Sains dan Teknologi Terpadu Surabaya · 2022 — 2026

Focused on software engineering, web development, data structures, databases, and human-computer interaction.

Start a conversation

Have a project, internship, or idea worth exploring?

I'm always happy to talk about useful products, learning opportunities, and the small decisions that make software better.

GitHub@William2152LinkedIn/in/william-sugiarto