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Heryanto — @herynto
Jakarta, Indonesia● Open to work

(Fullstack Engineer)

HERYANTO

// Backend lead at Parallax for three products — a psychometric assessment platform, a medical imaging pipeline, and an onchain IP licensing platform.

Six years on production backends.
Now building the frontend.

Get in touchheryantoliao8@gmail.com
Portfolio — Edition 2026Selected work ↓
About — the short version

Pick the right framework and database per product — then own it from schema to UI.

Software engineer with 6 years on production backends in TypeScript, Node.js, and Python — now extending into the frontend on Next.js.

At Parallax I lead the backend for three products: the HIMPSI-certified psychometric platform, a medical imaging pipeline on Orthanc PACS, and an IP licensing platform on Story Protocol.

// framework & database picked per product, Zod everywhere.

Selected work — 2023–2026(03 projects)

Selected work

01
Assessment engine · HIMPSI-certified

HIMPSI Psychometric Platform

Leading the rebuild of the HIMPSI-certified psychometric platform. Designed the scoring data model and assessment engine alongside HIMPSI psychologists — turning their certification rules into code.

  • Next.js 16
  • Hono
  • MongoDB
02DICOM sync on Orthanc PACS

Medical Imaging Pipeline

Built and owned the backend: a Python daemon polling Orthanc PACS to sync DICOM studies into MongoDB, plus a Flask service for patient/study/series management, structured reporting, and export.

  • Python
  • Flask
  • Orthanc
  • MongoDB
03Onchain licensing on Story Protocol

IP Licensing Platform

Designed and shipped the backend: a tRPC API, a Prisma data model on Postgres, S3 file handling, and OpenTelemetry instrumentation for distributed tracing.

  • tRPC
  • Prisma
  • Postgres
  • S3
  • OpenTelemetry

Experience

2020 — Present

  1. Jul 2025 — Present

    Parallax

    Fullstack Engineer

    • Leading the rebuild of the HIMPSI-certified psychometric platform on Next.js 16, Hono, and MongoDB — designed the scoring data model and assessment engine with HIMPSI psychologists.
    • Building the marketplace and document-signing flows for an onchain asset-financing platform on the T3 Stack (Next.js, tRPC, Prisma), from schema to UI.
    • Migrated staging from managed DigitalOcean services to a self-managed VPS with Docker and GitHub Actions CI/CD, cutting staging spend from $200 to $12 per month. Production stayed on managed infrastructure.

  2. Jan 2023 — Jul 2025

    Parallax

    Backend Engineer

    • Built and owned the backend for a medical imaging product — a Python daemon syncing DICOM studies from Orthanc PACS into MongoDB, plus a Flask service for reporting and export.
    • Designed and shipped the backend for an IP licensing platform on Story Protocol: tRPC API, Prisma on Postgres, S3 file handling, and OpenTelemetry tracing.
    • Built the backend for Tokenomy, a multi-wallet DeFi dashboard with Web3Auth and WalletConnect, including server-side wallet operations and the Mongoose data layer.
    • Picked Node frameworks (Express, NestJS, Hono) and databases per product, with Zod for validation everywhere.

  3. Oct 2021 — Dec 2022

    Bina Nusantara IT Division

    Backend Developer

    • Shipped ASP.NET Web API endpoints for internal enterprise applications used across university departments.
    • Worked in an Agile/Scrum team: sprint planning, peer code review, and a Git-based release workflow.

  4. Mar 2020 — Sep 2021

    Bina Nusantara IT Division

    Junior Backend Developer

    • Built a Python and Selenium tool to sync student records with PDDIKTI, cutting a multi-hour manual reconciliation to under 30 minutes.
    • Replaced ad-hoc SQL scripts with internal data-processing tools so the data center team could operate without writing raw queries.
By the numbers

Impact by the numbers

(01)
6
years in production

TypeScript · Node.js · Python

(02)
3
flagship products led

backend lead at Parallax

(03)
$200 → $12
monthly staging spend

~94% cut, self-managed VPS

Backend-strong. Extending into the frontend, one product at a time.

Stack

What I build with
Primary stack01
  • TypeScript / Node.js
  • Hono
  • Next.js
  • MongoDB
  • Mongoose
Also worked with02
  • Python (Flask)
  • C# (ASP.NET)
  • NestJS
  • Express
  • PostgreSQL
  • MySQL
  • Redis
  • Prisma
  • Drizzle
APIs03
  • REST
  • tRPC
  • Zod validation
Infrastructure04
  • Docker
  • Linux / VPS
  • GitHub Actions CI/CD
  • AWS S3
  • BullMQ
  • Socket.IO
  • OpenTelemetry
Practices05
  • Code review
  • System design
  • Agile / Scrum
Side project — solo

Gitron

Self-hosted CI/CD dashboard with real-time activity streams, audit logging, and GitHub integration. Solo side project.

  • Next.js
  • Hono
  • MongoDB
  • BullMQ
  • Socket.IO
github.com/herynto/gitronlink pending
Jakarta, Indonesia · Open to work

Let's build something solid.

heryantoliao8@gmail.com