darktama_

DarkTama · Bandung, Indonesia

Ekatama Ilham Prayoga

Backend Engineer

I build the backend systems lending institutions run on: loan management services in Java and Spring Boot, and the batch jobs that reconcile core banking CSV and DOCX feeds into PostgreSQL.

Download resume Projects GitHub
Backend
Java, Spring Boot, PostgreSQL
Side work
Rust, Tauri, Go
Experience
~4 years, several systems live in production
donut.rs
rotating torus

Experience

Backend Engineer

PT Digital Amore Kriyanesia · Bandung

Oct 2022 — Present
  • Architected and deployed multi-tenant loan management backends using Java Spring Boot across 4 institutional clients, with 3 actively operating in production and maintained concurrently.
  • Engineered automated batch integration pipelines for Core Banking System (CBS) reconciliation from raw CSV and DOCX data feeds without direct CBS API access.
  • Designed domain-specific financial calculation engines, including multi-tier tiered interest, amortized repayment schedules, and loan lifecycle state machines.
  • Optimized PostgreSQL schemas and analytical queries for high-throughput daily multi-client ledger exports.
Java·Spring Boot·PostgreSQL·Batch Processing·Core Banking Integration·Docker·Linux

Projects

NineGuard

Core contributor · Go

An OpenAI-compatible AI gateway. A team shares upstream provider keys, and each member gets their own key with quotas, plus usage and cost tracking.

  • Real provider keys stay in an encrypted vault.
  • Model groups work as access templates, and the same groups scope plugins.
  • Built as a separate gateway in front of the router, not a fork, so upstream updates ship without merge or sync work.

Used daily as the internal AI gateway at my employer.

Source on GitHub
nineguard · member key (placeholder screenshot)
  1. 1Each member gets their own key. The provider key behind it is never shown.
  2. 2The model group decides which models and plugins the key can reach.
  3. 3Quota and cost are tracked per key.
ASCII sketch. Real screenshot goes here.
Shellfery
Co-creator & core contributor · formerly OpenTerm
An SSH terminal and dual-pane SFTP client in one app, instead of running Termius and FileZilla side by side. Built with Tauri 2, Rust and React, no Electron.
Rust · Tauri 2 · React 19 · xterm.js · Tailwind CSS
Source on GitHub 
Utilities & Systems Tooling
4 repositories
Desktop Media ToolingGitHub 
Kecilin
Zero-hassle desktop utility leveraging native FFmpeg H.264 pipelines to batch compress videos under WhatsApp size limits while preserving visual fidelity.
↳ Native FFmpeg pipeline · Drag-and-drop batch queue
Rust·Tauri·FFmpeg·TypeScript
Systems & Mobile BridgeGitHub 
Anyleap
Lightweight desktop workstation orchestrating ADB and scrcpy for butter-smooth wireless device mirroring, keyboard passthrough, and zero-latency input control.
↳ Low-latency video stream · Wireless ADB orchestration
Rust·Tauri·ADB / scrcpy·TypeScript
OS Daemon & Win32GitHub 
WindowsParentalControl
Background Windows service and WPF admin console enforcing strict daily screen time limits, account curfews, and local account session locks via Win32 APIs.
↳ Local account policy enforcement · Background Win32 daemon
C# / .NET·Win32 APIs·Windows Service·WPF
Client-Side Web & WASMGitHub 
BagiAdil
Zero-server privacy bill-splitting utility executing client-side OCR via WebAssembly to parse receipt line items, compute tax distributions, and eliminate manual entry.
↳ Client-side WASM OCR · 100% in-browser privacy
TypeScript·WASM OCR·Web APIs
Technical Stack
Engineering Disciplines
Backend engineer by day (Spring Boot / Java) · Native desktop tools & utilities by night (Rust / Tauri).
Backend & Enterprise (Core)
  • ·Java
  • ·Spring Boot
  • ·PostgreSQL
  • ·Batch / ETL Pipelines
  • ·Core Banking Integration
  • ·Go
  • ·REST / gRPC
Systems & Native
  • ·Rust
  • ·Tauri 2
  • ·Linux POSIX / PTY
  • ·C/C++
  • ·Tokio Async
  • ·xterm.js
  • ·Win32 APIs / WPF
Infra, Edge & Tooling
  • ·Docker / Compose
  • ·Linux Sysadmin
  • ·Cloudflare Pages / Workers
  • ·Traefik
  • ·Git / CI/CD
  • ·Bash / Zsh
  • ·Redis
InteractiveCanvas + Web Audio
Arcade Cabinet
Two retro mini-games (defrag.exe and packet-runner.sys) built with pure canvas and procedural Web Audio synthesis.
Launch Arcade 
Webring4 peers
Peer Network
Verified engineer nodes across backend architectures, systems programming, and craft frontend engineering.
View Network 
Contact
Initiate Direct Contact
Open to contract and full-time roles building Java & Spring Boot backend systems, fintech lending platforms, and high-performance Rust tooling.
Send email GitHub