Aditya Firmansyah
Senior Full-Stack Engineer — Customer-Facing Platforms & Scalable APIs
Thirteen-plus years architecting resilient web platforms, distributed microservices, and autonomous AI workflows — building scalable systems from zero to production.
Manifest — Contents Declaration
About
Senior full-stack engineer with 13+ years delivering customer-facing platforms, multi-tenant commerce solutions, and scalable APIs. Specializes in Next.js, TypeScript, Node.js and production system architecture, with additional FastAPI expertise. Built software supporting cross-border logistics across APAC, optimized catalog queries by 11.6×, and helped reduce reported regression defects by over 40% through engineering quality improvements. Combines hands-on delivery with platform reliability, payment integrations, and technical leadership.
Cargo Manifest — Technical Payload
Skills
Frontend
Backend & APIs
SaaS & Data
Platform & Delivery
Platform & AI
Practices
Cargo Log — Personal Freight
Featured Projects
Cargo Dispatch Terminal — Select a waybill ticket from the manifest to inspect full architecture and stack payload:
Lead Architect & Founder — Next.js + TypeScript + FastAPI
Dagango Multi-Tenant E-Commerce Platform
Multi-tenant commerce platform with isolated storefronts on shared infrastructure, 20,000+-item catalog operations, sub-second query performance, and resilient payment workflows powered by Next.js, TypeScript, FastAPI, PostgreSQL, and Redis.
- Delivered a multi-tenant e-commerce platform using Next.js, TypeScript, FastAPI, and PostgreSQL, enabling separate storefront experiences on shared infrastructure through host-based tenant isolation.
- Improved the responsiveness of a 20,000+-item product catalog by optimizing PostgreSQL indexes and queries; reduced a measured lookup from 4.52 ms to 0.39 ms (11.6× faster).
- Built reliable bulk-import and payment-reconciliation workflows with Redis-backed jobs, transaction safeguards, and idempotency controls, reducing the risk of partial catalog updates and duplicate payment processing.
- Owned deployment, backup, and monitoring-oriented operations on self-hosted Linux infrastructure, supporting reported availability of 99.9%+ for the platform.
Production Build — FastAPI + React TS
mycv.ai.id ATS Resume Studio & Career Engine
Resume optimization application with an 8-stage processing pipeline, QRIS payment integration, vector PDF generation, and multilayer request throttling built with React, TypeScript, and FastAPI.
- Architected an 8-stage resume optimization pipeline that transforms unstructured work history into measurable engineering achievements while preserving technical depth.
- Engineered dynamic EMVCo QRIS payment integration with automated tag 54 nominal injection, unique 3-digit order verification, forwarder webhooks, and multilayer request throttling.
- Developed publication-grade single-column vector PDF templates mapped directly to ReportLab with embedded TrueType fonts, guaranteeing 100% vector parser compliance.
Open-Source Build — FastAPI + React TS
Kas Transparan Civic Treasury & Dues Management
Open-source civic trust and neighborhood treasury system built for Indonesian RT/RW communities. Provides public financial transparency with no login required, self-check dues portal for residents, multi-month arrears detection, batch/advance payment processing, and granular role-based governance.
- Architected multi-tenant backend in FastAPI (Python 3.11) with strict PIC-based dues ownership and role segregation (Admin/Bendahara vs. Ketua approval workflow), backed by 85+ automated Pytest tests and zero-dependency XLSX/CSV reporting.
- Engineered modern, accessible frontend using Vite, React 19, TypeScript, and Tailwind CSS — featuring civic-trust design language, responsive compact mobile metrics, and sub-second phone-number lookup portal for residents.
- Production-deployed to VPS with Nginx reverse proxy, systemd daemon isolation, Let's Encrypt SSL, and automated CI pipelines enforcing strict Ruff and TypeScript quality gates.
Civic Platform — FastAPI + React PWA
TirtaDesa Rural Water Utility & Progressive Billing Platform
Offline-first meter-reading workflow allowing utility field officers to record water usage without connectivity and sync later, featuring IndexedDB storage, progressive tariff calculation, and native Web Bluetooth printing.
- Architected offline-first PWA field engine using Dexie.js (IndexedDB) allowing utility field officers to record usage without connectivity and sync reliably when back online.
- Engineered tiered progressive tariff calculation, maintenance fees, and transparent non-revenue water (NRW) leak audit ledgers.
- Built browser-native thermal receipt printing via Web Bluetooth API using ESC/POS protocol without third-party middleware.
Solo Build — Full-Stack Rust
GainForge Gamified Fitness RPG
GainForge turns real workouts into RPG quests — users earn XP, level up a character, and grow four stats (STR, END, AGI, FLX) by completing daily strength, cardio, flexibility, and endurance sessions. Built solo end-to-end: product design, schema, API, frontend, and production deployment.
- Full Rust stack front-to-back — Leptos (WASM) frontend and an Axum backend share a single DTO crate, keeping types identical across client and server.
- Designed the quest/XP/leveling system and a 4-stat character model, plus an admin panel for managing training programs, exercises, and weekly schedules.
- Shipped and self-hosted on a VPS with Docker and PostgreSQL — 15 schema migrations, 100+ commits, with iterative mobile-UX polish (drawer navigation, responsive schedule grid).
Solo Build — Full-Stack JavaScript
Cover Letter Generator AI Cover Letter Tool
Users build a profile (skills, bio, experience), type in a job title and description, and get a tailored, editable cover letter back. Originally built Upwork-specific with URL-based job scraping; broadened to a general-purpose tool once Upwork shipped its own in-house AI proposal writer, making an external Upwork-only tool redundant.
- User profile and job details feed a prompt builder that calls an LLM API to draft the letter, followed by a humanization pass that strips AI-writing tells (em dashes, buzzwords, promotional filler) before the user reviews and saves it.
- Full auth/profile/letter-history schema in PostgreSQL (users, profiles, projects, cover_letters with draft/saved status) behind JWT auth.
- AI backend (endpoint + model) is env-configurable rather than hardcoded — swapped providers in production without a code change when the original vendor's model was discontinued. Self-hosted via git-push deploy (bare repo + post-receive hook + systemd + nginx).
Shipment History — Tracking Log
Career Experience
Interactive Tracking Manifest — Current role open by default; click any shipment to inspect full deliverables & stack:
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Lead Architect & Founder — Dagango
Active Role ↓- Delivered a multi-tenant e-commerce platform using Next.js, TypeScript, FastAPI and PostgreSQL, enabling separate storefront experiences on shared infrastructure through host-based tenant isolation.
- Improved the responsiveness of a 20,000+-item product catalog by optimizing PostgreSQL indexes and queries; reduced a measured lookup from 4.52 ms to 0.39 ms (11.6× faster).
- Built reliable bulk-import and payment-reconciliation workflows with Redis-backed jobs, transaction safeguards and idempotency controls, reducing the risk of partial catalog updates and duplicate payment processing.
- Owned deployment, backup, and monitoring-oriented operations on self-hosted Linux infrastructure, supporting reported availability of 99.9%+ for the platform.
Next.jsTypeScriptFastAPIPostgreSQLRedisMulti-tenantLinux -
Chief Technology Officer — GOSG Consulting
View Specs ↓- Delivered commercial e-commerce and client platforms end-to-end with Next.js, TypeScript, Node.js and Medusa, connecting business requirements to production-ready storefront and backend functionality.
- Reduced reported regression defects by over 40% by introducing test-driven development, structured code reviews and automated CI quality checks, improving release confidence for client projects.
- Implemented application integrations and AI-assisted operational workflows to automate data enrichment and structured customer interactions; mentored developers and aligned technical delivery with client requirements.
- Maintained production deployments and reliability through automated releases, Linux administration and reverse-proxy configuration, supporting reported 99.9%+ availability.
MedusaNext.jsNode.jsTypeScriptCI/CDTDDAI WorkflowsPostgreSQL -
Software Engineer — Pickupp, Singapore
View Specs ↓- Delivered merchant, administration, fleet and delivery-agent applications supporting cross-border parcel operations across Singapore and APAC, equipping multiple operational teams with dedicated workflows.
- Developed TypeScript/gRPC microservices powering dispatch and route allocation during high-concurrency delivery peaks, supporting operational throughput and system scalability.
- Integrated external carrier APIs including UPS, enabling merchant shipping quotes, cross-border label generation and automated shipment-tracking updates.
- Supported reliable peak-season operations through Docker containerization and rolling Kubernetes deployments; standardized API contracts with distributed engineering teams.
TypeScriptNode.jsgRPCMicroservicesDockerKubernetesCarrier APIs -
Full-Stack Developer — WebDesignHamburg
View Specs ↓- Shipped responsive commercial websites and client portals for European customers, turning business requirements into working interfaces backed by PHP/MySQL APIs.
PHPMySQLJavaScriptHTML5CSS3Responsive Design -
Senior Web Application Developer / Web Developer — Incuvius
View Specs ↓- Contributed to delivery of 30+ client web projects, improving application responsiveness through MySQL query optimization and frontend troubleshooting while mentoring junior developers.
JavaScriptjQueryPHPMySQLHTML5CSS3Database Optimization
Quality Control — Certified Seals
Certifications & Languages
Consignee Details — Final Destination