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Senior Frontend & Mobile Engineer
Rangga Prastio
Self-taught engineer. I started on the backend, then found my home in frontend and mobile. Today I build the frontend of a Swedish SaaS and run Hikode on the side.
Bandung, Indonesia
A career, built span by span
Each pillar is a role. Its height is scope: from intern to leading three teams.
Jul 2026 – Present
4 mo, Full-time
Senior Frontend DeveloperNow
CheckProof, Sweden · Hybrid
- Building the frontend of CheckProof, a Swedish SaaS used by companies across Europe and expanding into the US in 2026
- Ship product features end to end with the latest Angular and TypeScript
- Work async with product and engineering in Sweden from a distributed Europe–APAC team
Angular, TypeScript
Nov 2024 – Jun 2026
1 yr 8 mo, Full-time
Lead Engineer
Be Management, South Tangerang · Hybrid
- Led engineering across 3 teams, from client scoping to delivery
- Ran scope and timeline negotiations with clients so commitments stayed realistic and achievable
- Owned architecture and code review across an Angular + NgRx frontend and a Node.js + Express + MongoDB backend
- Trained engineers beyond legacy workflows into AI-assisted, agentic development
Angular, NgRx, Node.js, Express, MongoDB
Nov 2023 – Jan 2025
1 yr 3 mo, Full-time
Senior Frontend Developer
Nikel, Central Jakarta · On-site
- Senior frontend developer on an enterprise fintech lending portal
- Built multi-step loan approval flows with role-based access control (RBAC)
- Worked on the latest Angular of the time (v17) with Tailwind CSS as the design system foundation
Angular 17, Tailwind CSS, RBAC
Mar 2023 – Jan 2024
11 mo, Contract
Mobile Application Developer
PT Serasi Autoraya · via Esha Parama Technology, North Jakarta · Hybrid
- Built and shipped a production React Native app for one of Indonesia's largest auto-fleet companies
- TypeScript end to end with Redux, structured to scale as features grew
React Native, TypeScript, Redux
Oct 2020 – Nov 2022
2 yr 2 mo, Contract
Senior Frontend Developer
PT Maju Gemilang Indotech, South Tangerang
- Led a small team and kept code quality high across several product lines
- Set the team's git flow, code architecture, and deployment process
React, React Native, Node.js
Jun 2020 – Aug 2020
3 mo, Contract
Frontend Engineer
Telunjuk.com, Indonesia · Remote
- Researched the optimal stack for the flagship product and guided the migration off legacy tech
- Built the company design system
Vue.js, Bulma
Dec 2019 – Jun 2020
7 mo, Full-time
Frontend Developer
SALT · PT Ako Media Asia, Indonesia · Hybrid
- Revamped the frontend of Bebeclub and Nutriclub for Danone, and built the Bebeclub loyalty journey and minigames from scratch
- Helped the React Native team ship the first release of MyOrbit for Telkomsel
JavaScript, jQuery, Bootstrap, React Native
Oct 2019 – Dec 2019
3 mo, Internship
Full-stack Developer
Dumbways Indonesia, Bintaro
- Intensive full-stack bootcamp
JavaScript, Node.js
May 2019 – Aug 2019
4 mo, Full-time
Android Developer
Glovory Technologies Indonesia, Indonesia
- Started as a frontend developer, then built a React Native mobile app
React Native, Vue.js
Specification
What I build with, and how deep it goes.
- Expert
- Advanced
- Familiar
Frontend
- Angular
- React
- TypeScript
- JavaScript
- Next.js
- Astro
- NgRx / Redux / Zustand
- Web Performance
Mobile & Backend
- React Native
- Node.js
- Express & MongoDB
- REST API Design
- Laravel / PHP
- Inertia.js
- PostgreSQL
Styling & UI
- TailwindCSS
- Design Systems
- Responsive Design
- Accessibility
- Motion & Interaction
AI-Assisted Development
- AI-Assisted Dev (Kiro, Cursor, Copilot)
- Agentic Workflows & MCP
- Prompt Engineering
- LLM API Integration
Testing & Quality
- Vitest
- Playwright
- Test-Driven Dev
Tools & Platform
- Git & CI/CD
- Docker
- Cloudflare / Vercel
Method: AI with engineering discipline
AI does not replace engineering. It multiplies it. Every AI output gets my review, my tests, and my name on it.
Directed
Small, well-scoped tasks, the model chosen per complexity, context prepared through docs and tests.
Measured
Agents handle research, scaffolding, and regressions; I stay on architecture and product decisions.
Education
Vocational school, Software Engineering
SMK Negeri 8 Bandar Lampung, 2015–2018
Languages
- IndonesianNative
- EnglishProfessional working proficiency