Krisna Dwipayana

Progress, a school-management system for a network of Swedish upper-secondary schools.

• Migrated the web app to React Native, so web and mobile share one codebase in a single monorepo.
• Implemented new features and resolved issues.
• 170+ commits delivered.

Migrated a legacy C++/Qt mobile app to Kotlin Multiplatform for Android and iOS.

• Shared business logic, Compose Multiplatform UI and Clean Architecture layering.
• Google Maps on Android and MapKit on iOS.
• Contributed to NomaMngr, the React / Node.js / GraphQL admin panel.

Marketing site and design system for a location-based AR/GPS game platform, plus THNX internal tools.

• Exenze.Web on Next.js 16, Tailwind v4 and Sanity, with Mixpanel, Sentry, Vitest and Playwright E2E tests.
• Exenze design system: a CSS token set for colour, type, spacing and motion.
• Sök & Hitta, a multi-tenant location-game PWA with GPS geofencing, hosted on Azure Static Web Apps.
• SBOM Manager UI in Blazor, .NET 10 and MudBlazor.

The Oddbit company website, which I built and maintained.

• Next.js 16, Tailwind v4 and shadcn/ui, with English, Swedish and Indonesian via next-intl.
• Deployed to Cloudflare Workers.
• 850+ commits.

AIXP, a campaign manager built for Pegadaian.

• Built the campaign-management web app with Next.js on the frontend and a NestJS backend.
• Wrote the SQL queries behind the campaign data.

An out-of-the-box AWS AI and container solution delivered to Accenture through Feedloop.

• Built the Next.js frontend for the AWS AI / container package.
• One-year engagement, 2022 to 2023.

Windows desktop app for scanning, organizing and cleaning local files, with a SafeLock safety layer.

• SafeLock blocks system paths, protected extensions and drive roots before any file is moved or deleted.
• Parallel folder scanner and duplicate finder (size, header, then full-file BLAKE3 hashing).
• Deletes go to a quarantine with restore and undo, plus JSON rules with folder watching.

Booking and payment backend for small activity operators such as surf schools and tours.

• Row locks per slot stop two customers booking the last seat: 20 simultaneous requests for a 5-seat slot book exactly 5.
• Signed, idempotent payment webhooks; partial, double, late and cancelled payments each end with the exact refund owed.
• Retry-safe bookings (Idempotency-Key), customer access tokens, and a transactional outbox for notifications.
• 61 tests on real PostgreSQL, with CI and migrations checked up and down.

A web platform in one monorepo: accessible design system, secure OIDC login, telemetry, release tooling and performance budgets, each enforced in CI.

• @kit/ui: token-driven React components with light and dark themes; axe accessibility checks in a real browser, keyboard tests and visual regression run on every push.
• @kit/auth: OIDC code + PKCE through a backend-for-frontend, so tokens never reach browser JavaScript; CSRF protection, refresh-token rotation, 42 tests and a written threat model.
• Changesets releases with a deprecation, a breaking change and a codemod; size-limit and Lighthouse CI fail the build (a deliberate 450 kB regression raised JS from 208 kB to 660 kB and was caught).
• Next.js demo with a strict nonce-based CSP and OpenTelemetry traces, logs and Web Vitals; lab numbers only, and the demo is not deployed.