I fix the problems your team gave up on.
Surabaya, Indonesia
about.me()
My brain doesn't do busywork, it does breakthroughs. Give me something impossible and I won't stop until it's solved. For 13 years, I've been the person teams call when something is broken in a way nobody understands. Crawlers that need to go from 30 seconds to sub-second. Billing systems that need to migrate with zero downtime. Apps that need to work in a jungle with no cell signal. I don't do generic fullstack work. I do the work nobody else wants to touch.
$ how_i_work
I don't do well with busywork. I do extremely well with hard problems that require deep focus and creative problem-solving. If your challenge is "nobody on the team can figure this out", that's when I'm at my best. I'm not the guy to maintain your CRUD app. I'm the guy you bring in when the problem is ugly and the stakes are high.
Career.timeline()
VerticalInt
Senior Software Engineer - Project Lead
- ▹Led technical transition of Proxycurl to EnrichLayer post-acquisition
- ▹Migrated payment system from Stripe to Maple Billing: 70%+ cost reduction
- ▹Built normalization layer for backward compatibility with zero downtime
Nubela Pty Ltd
Senior Software Engineer
- ▹10x improvement in data retrieval speed (30s → 0.7s)
- ▹Increased in-house crawler coverage from 15% to 95%
- ▹Built team-based account management for enterprise clients
Travlr Pty Ltd
Senior Mobile App Engineer
- ▹Built Travlr & The Bali Bible mobile apps serving 2,000+ users
- ▹Designed white-label B2B product adopted by 15+ brand partners
- ▹Automated theming, building, and deployment pipelines
Synergics Digital
Fullstack Software Developer
- ▹Built E-Dumas public complaint system for Indonesian Police
- ▹Developed crime reporting & case management for East Java PD
- ▹Created asset monitoring system for Pertamina operations
work.showcase()
10x Crawler Optimization
Nubela | 2022–2025
Core data retrieval took 14–30 seconds per request. At scale, this made the product borderline unusable for enterprise clients.
Rebuilt the crawler architecture from the ground up. Increased in-house coverage from 15% to 95%, eliminating dependency on expensive third-party proxies.
10x speed improvement, 30s down to 0.7–7s. This became a competitive advantage for the entire product.
Zero-Downtime Payment Migration
VerticalInt | 2025
Post-acquisition, the entire payment infrastructure needed to move from Stripe to Maple Billing, without breaking existing customers or losing revenue.
Built a normalization layer that maintained full backward compatibility. Migrated the billing system with zero downtime during the transition.
70%+ reduction in payment processing costs. Zero customer disruption.
Offline Map System
Regional Police, Sulawesi | 2024
Police operating in remote mining areas of Sulawesi had zero cell signal. They needed full navigation capability with no internet connection.
Used MOBAC to extract and pre-generate map tiles from Google Maps and Mapbox. Built a custom Android app with OSMdroid for fully offline map rendering.
Field officers got reliable navigation where no mapping app works. Fully offline. Zero dependency on connectivity.
Device Fleet Manager
Community, 500+ Devices | 2022
The arm64 crypto mining boom created a need to manage hundreds of mini computers remotely: monitoring temps, hashrates, running scripts across the fleet.
Built a real-time monitoring and management dashboard from scratch. Reverse SSH tunneling across WAN to reach devices behind NATs.
Adopted for 500+ devices. Real-time monitoring at scale with remote script execution.
White-Label App Platform
Travlr | 2018–2022
Travlr needed to offer branded mobile apps to 15+ B2B partners without building each one from scratch.
Designed a white-label architecture in React Native: automated theming, building, and deployment so a new branded app could be generated from config, not code.
15+ brand partners onboarded. 2,000+ end users across apps. One codebase, many products.
now.building()
asyncwork.live
in progressA body-doubling platform for remote workers who need the quiet presence of others to stay focused, no cameras, no small talk, just the social pressure of knowing someone else is working alongside you.
Born from my own experience with isolation and needing presence to focus. I built the full stack solo: WebRTC, real-time session matching, peer chat. It's early, it's real, and it's mine.
stack.list()
$ What I Ship With
// daily$ What I Reach For
// when the problem demands it$ What I've Solved Problems In
// problem domainsGot a problem nobody
wants to touch?
Tell me what's broken. I'll tell you if I can fix it.
> raizal.pregnanta@gmail.com