Performance
Stop paying for renders you never see
A practical pass over memoisation, derived state and why most useEffect calls are a smell rather than a solution.
12 Mar 2026 · 6 min readHello, I'm
WillyGunantara
Full-stack Developer
I build scalable web products and AI-powered experiences from idea to production.
Available for selected projects
Available for Q3 projects
LocationIndonesia
TimezoneGMT+7
Response< 24h
About Me
A developer who cares about the details
Ten years of shipping product surfaces for startups and enterprise teams, from design systems to the APIs behind them.
I'm Willy Gunantara
A lead UX & UI designer based in Indonesia
I partner with product teams to turn rough ideas into interfaces people trust. My work sits between design and engineering: accessible component libraries, measured performance budgets, and front-ends that stay maintainable long after launch.
Personal info
- Name
- Willy Gunantara
- Age
- 31 Years
- Nationality
- Indonesian
- Freelance
- Available
- Address
- Indonesia
- Phone
- +1 234 566 7788
- hello@benyportfolio.com
- Languages
- Indonesian, English
My Experience
Ten years of shipping, taught by real constraints
Education, craft and the work itself — grouped so you can skim the part you care about.
Education
- 2020 — 2021
Ph.D in Human-Computer Interaction
Harvard University, Cambridge, MA
2016 — 2019Computer Science
Imperialize Technical Institute
2011 — 2016Graphic Design
Web Graphy, Los Angeles, CA
Skills
Web Design
85%
React & Next.js
92%
TypeScript
88%
Design Systems
78%
Motion Design
80%
Awards
- 2020
Best Developer
University of Melbourne, NA
2019Best Technical Writer
Online Typodev Sakoolart Ltd.
2017Best Freelancer
Fiverr & Upwork, Top Rated
Services
I provide a wide range of digital services
Six ways I usually plug into a team, from a single audit to owning the whole front-end.
Product design
Wireframes to polished flows, validated with prototypes before a line of production code exists.
Frontend architecture
Typed component layers, predictable data fetching and a bundle budget that survives feature growth.
Design systems
Token-driven libraries documented for real teams, accessible to WCAG 2.1 AA by default.
Performance work
Profiling first, then shipping the fixes: rendering cost, network waterfalls, Core Web Vitals.
Web applications
Dashboards and internal tools with full loading, empty and error coverage on every surface.
Team mentoring
Review culture, conventions and pairing sessions that raise the whole team, not one repository.
Portfolio
Selected work from the last three years
Product surfaces built end to end — architecture, interface and the measurements that proved they worked.
All
Web app
Design
Mobile
web2025
Atlas operations console
web2024
Nimbus checkout re-platform
design2024
Orbit design system
mobile2023
Kite mobile banking
design2023
Ember brand refresh
mobile2022
Signal habit tracker
News
Notes on building for the web
Short, practical write-ups from the work — no thought-leadership filler.
Design systems
Design tokens that survive a redesign
Naming by role instead of by value is the difference between a token set you keep and one you rewrite every quarter.
02 Feb 2026 · 8 min readAccessibility
Accessibility as a default, not a phase
Focus order, contrast and semantics baked into the component layer cost far less than an audit six months later.
18 Jan 2026 · 5 min readContact
Let's talk about your next release
Tell me what you are building and where it hurts. I reply within two working days.