Work archive
Each entry names the employer or direct client, my role, the work I owned, led, or contributed to, and the result.
Production / Jun 2025 – Present
SoftwareSeni / Funraisin · Full-stack Engineer
Protected donation and raffle payments against concurrent requests, fixed a bulk import that failed on its first attempt, and delivered giving features across four template generations.
Evidence: A test with 21 concurrent requests left one raffle sale record after the fix, down from 21 before it.
Production / Oct 2022 – May 2025
SoftwareSeni / Reapit · Backend Engineer
Improved reliability across seven CRM integrations and led solution planning for Realty+ and the Attachment Service. Added provider controls, webhook recovery, and direct-to-R2 uploads.
Evidence: Across 7 CRM providers serving 8 downstream products, a failing provider's errors stayed with that provider, empty webhook signatures recovered on the next adapter run, and attachment traffic moved off the application servers.
Production / Aug 2022 – Sep 2022
SoftwareSeni / Moladin · Backend Engineer
Evidence: An expired transfer records whether the manager-response window or the arrival window ran out.
Production / May 2022 – Jan 2024
Prasetiya Mulya University · Full-stack Engineer
Evidence: Course access followed confirmed Midtrans state, not the browser's return to a success page, checked by walking each transaction state through the sandbox.
Production / Mar 2022 – Aug 2022
SoftwareSeni · Backend Engineer
Evidence: Alias-based reindexing made a rebuild a repeatable command that did not take search offline.
Production / Aug 2021 – Feb 2022
SoftwareSeni / Fun Gum · Full-stack Engineer
Evidence: Traced a two-to-four-minute operation to cross-region database latency by comparing the same script on two servers.
Production / Dec 2019 – Jan 2020
PT Ciberindo Makmur Sejahtera · Backend Engineer
Evidence: Both applications ran in production, with RumahPro orders paid through Epayindo payment links.
Production / Sep 2019 – Jul 2020
Reksa Karya · Software Engineer
Evidence: Older app builds kept signing in after the move to revocable device tokens, and postal figures in the app matched the web application.
Production / Jul 2019 – Jul 2021
Java Multi Mandiri · Backend Engineer
Evidence: One failing Shopee store no longer stopped the order sync for every connected store; operators saw which stores failed and why.
Production / Jul 2019 – Jul 2021
Java Multi Mandiri · Full-stack Engineer
Evidence: Receipts above an invoice's remaining balance were rejected, an exact-balance receipt was accepted, and closed issues kept their history after moving to multiple assignees.
Public code
Client source stays private. The rebuilds here are written from scratch with fictional data and contain no client code.
A sponsor's match cap held under concurrent donations with a MySQL named lock, proven by a test that fires real concurrent requests.
Funraisin case studyUPS fleet monitoring: a queued poll per unit reads its network-card status page, flags units that stop reporting, and rates battery health from maintenance checks.
2021 freelance entryPractice-permit applications through a row-locked state machine with an append-only history, and printed permits anyone can verify by QR code.
Fundraising share cards for link previews and Instagram, rendered in plain PHP and GD, that stay legible whatever titles, names, and amounts they are given.
Admin panel and pilgrim-app API for travel agencies: itineraries that inherit from trip to group to pilgrim, revocable device tokens, and a geofenced location map.
Source for this site: Next.js, MDX case studies, generated Open Graph cards, and the resume PDF.