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Open to Senior / Lead & AI-Native roles

Yustar PramudanaSenior Full-Stack & Mobile Engineer

Yustar Pramudana portrait

10+ years shipping banking-grade backends and AI-native products across Web, Android & iOS.

Medan, IndonesiaOpen to Senior / Lead Full-Stack, Mobile & AI-Native roles · Global Remote · ID, SG, MY, JP, SA

Let's connectGitHub
  • Android · Kotlin + Jetpack Compose
  • iOS · SwiftUI
  • Web · React / TypeScript
  • Backend · Deno / Supabase / .NET / Java
  • AI-Native Architecture · MCP / OpenAPI

About

Enterprise discipline. AI-native delivery.

Full-stack & mobile engineer (10+ years) with a dual background: enterprise backend experience in banking (Java, .NET C#) combined with modern AI-native product development across Web, Android, and iOS.

I design and deliver software where AI models and autonomous agents (Claude Code, Cursor, Kilo, Opencode) are built directly into the architectural fabric — backed by deterministic guardrails, clean domain layers, and strict contract typing.

I combine enterprise-grade backend discipline with AI-accelerated workflows to ship production software at 3x velocity without compromising architectural rigor.

10+

Years shipping software

3

National banks served

5

Platforms (Web · iOS · Android · API · AI)

3

Countries: ID, SG, PH (+ AU clients)

Yustar Pramudana portrait

Key Engineering Highlights

  • Modern Full-Stack & Mobile

    End-to-end delivery across React, Kotlin (Android), and Swift (iOS) driven by a unified OpenAPI spec, Supabase/PostgreSQL backends (RLS, RPCs), and Deno Edge Functions.

  • Custom Agent Tooling & MCP

    Architected custom Model Context Protocol (MCP) servers to automate multi-language client codegen (Kotlin/Swift/TS) and enforce monorepo contract integrity across platforms.

  • Applied Computer Vision & ML

    Designed a scale-invariant facial search engine using Google Cloud Vision and hand-designed geometric scoring algorithms (inter-eye landmarks + exponential decay weighting).

  • Payments & Webhooks

    Integrated Airwallex marketplace payments featuring HMAC-SHA256 signature verification, KYC onboarding, and idempotent event handling.

  • Enterprise & Banking Backends

    Proven track record in banking environments managing mission-critical Java, .NET C#, and SQL backend infrastructure built for security, high availability, and compliance.

Skills

What I work with

Grouped by discipline — no fake proficiency bars. Depth is proven in the stories and experience below.

Languages & Backends

  • Kotlin
  • Java
  • Swift
  • Python
  • TypeScript
  • .NET C#
  • SQL
  • Deno
  • Supabase
  • PostgreSQL
  • REST / OpenAPI

Mobile

  • Android (Jetpack Compose)
  • iOS (SwiftUI)
  • React Native (Expo)
  • Kotlin Coroutines / Flow
  • RxJava
  • Offline-first (Room, Realm)
  • Health Connect API

Web & Frontend

  • React
  • TypeScript
  • Next.js
  • Tailwind CSS
  • Monorepo (pnpm / Turbo)

AI & Agents

  • Custom MCP Servers
  • AI-Assisted Development
  • Claude Code
  • Cursor
  • Gemini / Antigravity
  • Google Vision API
  • OpenAPI-driven codegen pipelines

Engineering Practices

  • Clean Architecture
  • Contract-first development
  • Offline-first systems
  • System Design
  • CI / CD
  • Git workflows

Experience

Where I've shipped

A decade across banking, health tech and international product teams — Jakarta, Singapore, the Philippines, and remote.

  1. Oct 2022 – Sep 2025

    Senior Android Developer

    Rewardz

    Full-timeRemotePlay Store

    Android lead on reward & loyalty platform — modernized the UI layer and built a health ecosystem with offline-first architecture.

    • Migrated legacy Android UI components to Jetpack Compose, improving maintainability and cutting UI boilerplate.
    • Built a Health & Fitness module using Kotlin, Flow and Room with offline-first architecture.
    • Integrated the Health Connect API for unified tracking of steps, sleep, and activity data.
    • Collaborated with backend teams to guarantee reliable data synchronization and API contracts.
    KotlinJetpack ComposeClean ArchitectureCoroutinesFlowRoomOffline-first
  2. Apr 2021 – Aug 2022

    Android Mobile Application Developer

    zennya Health

    Individual ContractorRemotePlay Store

    Remote contractor delivering a healthcare application for patient services and medical data tracking during the pandemic.

    • Developed features for a healthcare mobile app used for patient services and medical data tracking.
    • Implemented offline data handling with Realm for reliability in low-network environments.
    • Built a real-time vaccination queue system during the COVID-19 pandemic.
    • Improved performance and stability across a mixed Java/Kotlin codebase.
    AndroidKotlinJavaRealmOffline syncREST APIs
  3. Jan 2019 – Feb 2021

    Software Engineer

    Bank OCBC NISP

    Full-timeHybridPlay Store

    Backend engineer on One Mobile banking — mission-critical financial systems built for security, availability and compliance.

    • Developed backend services powering the One Mobile banking application.
    • Built APIs for the foreign exchange (FX) module supporting real-time currency transactions.
    • Worked on Java / Spring MVC services with Microsoft SQL Server in a strict banking compliance environment.
    JavaSpring MVCREST API DevelopmentMicrosoft SQL ServerFinancial systems
  4. Jan 2018 – Jan 2019

    Android Developer

    Lawencon Internasional· for Bank Rakyat Indonesia

    ContractOn-site

    Built BRISIM — an internal Android application for real-time national transaction monitoring used by bank executives.

    • Developed BRISIM, an internal app used by bank executives for real-time transaction monitoring.
    • Implemented reactive architecture with RxJava to handle high-frequency financial data streams.
    • Built data visualization components for national banking transaction metrics.
    • Implemented secure local caching for sensitive financial data.
    AndroidRxJavaMVPFinancial data visualization
  5. Jan 2016 – Jan 2018

    Software Engineer

    PT Xsis Mitra Utama· for Bank Negara Indonesia

    ContractOn-sitePlay Store

    Delivered the BNI Mobile Banking v2 hybrid app — from the JS↔native bridge to secure backend APIs and biometric research.

    • Contributed to BNI Mobile Banking v2, a hybrid Cordova app with a JavaScript UI.
    • Developed a custom native bridge connecting JavaScript to native Android Java components.
    • Implemented secure SSL communication in the bridge for encrypted API transactions.
    • Built backend APIs in .NET C# and Microsoft SQL Server for internal services.
    • Collaborated with banking security teams researching biometric authentication (fingerprint & face recognition).
    JavaAndroidCordova.NET C#Microsoft SQL Server
  6. Nov 2015 – Dec 2015

    Java Programmer (Bootcamp)

    PT Xsis Mitra Utama

    BootcampOn-site

    Foundational Java training focused on backend and API development before joining the BNI mobile banking project.

    • Completed Java training focused on backend and API development.
    • Learned Spring MVC, Spring Boot and REST API fundamentals.
    JavaSpring MVCOracle Database

Success Stories

Proof, not just job descriptions

Every story follows the same structure — the problem, what I did, and the outcome. This is how I actually work.

One monorepo, four platforms, ~3x shipping velocity

The problem

Building backend, iOS, Android and web apps meant manually translating the exact same logic into three different languages. Repetitive boilerplate was the bottleneck — and AI agents without strict boundaries hallucinated diverging data models and layouts across platforms.

What I did

  • Centralized sources of truth: one OpenAPI spec for every API, and platform-neutral design tokens for the UI.
  • Declared iOS the design benchmark, then made Android and web mirror it 1:1 instead of guessing.
  • Built a custom pipeline that auto-generates native Swift, Kotlin and React code from those contracts.
  • Enforced an agent workflow: schema → types → iOS → Android → web.

Outcome

Zero visual drift, compile-time safety across platform boundaries, and time spent building features instead of writing boilerplate network code.

MonorepoOpenAPICodegeniOS · Android · Web

Custom MCP servers that keep multi-language code honest

The problem

Coordinating an AI-assisted monorepo across Kotlin, Swift and TypeScript: contract drift between platforms is invisible until runtime.

What I did

  • Architected custom Model Context Protocol (MCP) servers to give AI agents live project context.
  • Automated multi-language client codegen (Kotlin / Swift / TS) from a single contract source.
  • Enforced monorepo contract integrity across platforms at generation time.

Outcome

AI agents produce contract-correct clients by default — cross-platform drift is eliminated before code review.

MCPAI AgentsContract-firstMonorepo

Scale-invariant facial search engine

The problem

Matching faces across photos at different scales and distances — naive similarity fails as the face size in the frame changes.

What I did

  • Designed a facial search engine on Google Cloud Vision with a hand-built geometric scoring algorithm.
  • Scored inter-eye landmarks with exponential-decay weighting to stay invariant to face scale.

Outcome

A working search engine that matches faces reliably regardless of how far the subject was from the camera.

Computer VisionGoogle Vision APIAlgorithms

Marketplace payments with Airwallex

The problem

A cross-platform marketplace needed real-money flows: secure payout signing, regulated onboarding, and no double-charging on retries.

What I did

  • Integrated Airwallex marketplace payments across the stack.
  • Implemented HMAC-SHA256 signature verification for webhook authenticity.
  • Built KYC onboarding and idempotent event handling so retries never double-process.

Outcome

Payment processing that is authenticable, compliant, and safe under network retries — end to end.

PaymentsAirwallexWebhooksSecurity

Mission-critical banking backends

The problem

National-scale banking apps (OCBC NISP, BNI, BRI) demand security, high availability, and strict compliance — mistakes are not an option.

What I did

  • Shipped and maintained .NET C# / Java / SQL backends for FX transactions and mobile banking.
  • Built a secure JS↔native bridge with encrypted SSL communication for a hybrid banking app.
  • Researched biometric authentication (fingerprint & face) with bank security teams.

Outcome

Years of running mission-critical financial infrastructure trusted by millions of users across Indonesian banks.

BankingJava.NET C#SecurityCompliance

Resilience: from layoff to rebuilding like a beginner

The problem

After a layoff, interviews exposed gaps in DSA and system design fundamentals — the very things senior interviews test under pressure.

What I did

  • Reset with a structured daily training schedule across DSA patterns and system design.
  • Retrained fundamentals intentionally instead of relying on past experience.
  • Upskilled into the shifting market: cross-platform and AI-assisted workflows.

Outcome

A sharper, more disciplined and more resilient engineer — experience renewed into a flame instead of resting on old titles.

Growth mindsetDSASystem DesignDiscipline

Selected Work

Projects

A mix of client work I led end-to-end and public experiments on GitHub. Client work is shared at a level that respects confidentiality.

Cross-platform Marketplace

client

End-to-end marketplace shipped across iOS, Android, and Web from a single OpenAPI + design-token source of truth.

A custom build pipeline generates native Swift, Kotlin and React code from centralized contracts — the project that became my AI-native monorepo blueprint.

SwiftUIJetpack ComposeReactSupabaseDenoOpenAPIAirwallex

Scale-invariant facial search

client

Facial search using Google Cloud Vision plus hand-designed geometric scoring (inter-eye landmarks + exponential decay).

Matches faces across photos regardless of scale or distance in frame, backed by an AI processing workflow.

Google Vision APITypeScriptDenoSupabase

Sosmed

Test harness for reels infinite scrolling and a short-video player with like and comment support.

KotlinJetpack Compose
View on GitHub

PokemonApp_JetpackCompose

Pokémon app backed by a public API, built with Jetpack Compose.

KotlinJetpack ComposeREST API
View on GitHub

Writing

Articles & thinking

Practical breakdowns from the trenches — not just code, but the why.

Contact

Let's build something resilient

I'm open to senior / lead full-stack, mobile, and AI-native roles — globally remote, or based around ID, SG, MY, JP and Saudi Arabia. Reach out on any channel below.

LinkedInin/yustar-pramudanaGitHub@yuzutaruGitLab@yuzutaruMedium@yuzutaru

Want the full timeline, education and references?

Full profile on LinkedIn

Availability: Medan, Indonesia · Open to Senior / Lead Full-Stack, Mobile & AI-Native roles · Global Remote · ID, SG, MY, JP, SA