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I'm the backend engineer you call when your API is slow, your database is struggling, or your integration keeps failing. 10+ years building production backends, the last 6 primarily in Go — including high-traffic systems for a national telecom operator serving millions of users. I've seen and fixed most backend problems there are. CORE STACK Go (REST APIs, microservices, concurrency), MySQL & PostgreSQL, Redis, RabbitMQ, Docker, CI/CD. Also comfortable in Node.js and PHP when your existing codebase needs it. WHAT I CAN DO FOR YOU • Build clean, tested REST APIs in Go • Diagnose and fix performance bottlenecks: slow endpoints, N+1 queries, missing indexes • Design or refactor microservices and event-driven flows (RabbitMQ, queues, background workers) • Integrate payment gateways, CRMs, and third-party APIs reliably • Automate backend workflows and integrations (n8n, webhooks, scheduled jobs) • Set up Docker-based environments and CI pipelines HOW I WORK AI coding tools are part of my daily workflow (Claude, Copilot) — as a draft, never as shipped code. I read every diff, test every change, and can explain what I verified and why. Small PRs, tests with every change, clean git history, and written updates you can actually follow. My earlier Upwork history is from my student years. Since then I've been building enterprise systems full-time (see employment history). I'm back to bring that same production-grade reliability to your project. Based in UTC+7 (Indonesia) — direct overlap with Asia/Europe, async-friendly for US teams. Tell me what's broken — or what you want to build. I read every message.

HI I have 13 years of experience in programming (backend). My main programming language is Golang, and I have experience creating microservice applications using Docker, Kubernetes (ECS and GKE), setup CI/CD using GitLab-ci or Jenkins, and most of my projects using Echo framework for APIs and for connecting internal services I use Grpc or Kafka.

Senior Backend Engineer | Node.js • NestJS • TypeScript I am a Senior Backend Engineer with over 6 years of experience building, scaling, and operating production systems across Fintech, E-commerce, and EdTech. I specialize in transforming complex business requirements into high-performance microservice architectures. 🚀 My Expertise Includes: - Architectural Leadership: Led the migration of a monolith to a 19-service microservices ecosystem. - Performance Engineering: Optimized queries and backend logic to reduce API latency by 90% (from 1s to 50-100ms). - Financial Systems: Engineered coin exchange services and VIP staking features for blockchain-based products. - Integration & Scaling: Proven track record of integrating complex 3rd party gateways (Xendit, SendGrid, Twilio) and banking partners. - Infrastructure & DevOps: Orchestrating deployments on Kubernetes (GKE), AWS, and Docker with zero-downtime strategies. 🛠 Technical Stack: - Languages: TypeScript, Node.js, Go, PHP. - Frameworks: NestJS (Expert), Express.js, Laravel, Echo. - Databases: PostgreSQL, MySQL, MongoDB, Redis. - Messaging: Kafka, RabbitMQ, gRPC, Event-Driven Architectures. 📊 Notable Achievements: - Reduced payment processing time by 75% for a major payment gateway. - Spearheaded the backend migration from AWS Amplify to a scalable NestJS architecture for a US-based AI platform. - Built a hotel management aggregator (Govesta) from the ground up, including full ERD design and system architecture. I thrive in remote, high-ownership environments and am committed to delivering clean, maintainable code that aligns with long-term business goals. Let’s build scalable solutions that help your business thrive!

• Also known as Windows and macOS App Developer Expert • I use AI, obviously. I mean, who doesn't? • 5+ years of experience • I work on backend, frontend, databases, and Linux server administration • Main stack: .NET (C# / Visual Basic) and TypeScript / JavaScript • I build web and multi-platform desktop/mobile applications 📚 Technologies • My main tech stack is .NET (C# or Visual Basic .NET) and TypeScript / JavaScript • For .NET, I work with ASP .NET, Blazor, WPF, Windows Forms, MAUI (formerly Xamarin), Avalonia UI, and more • For TypeScript / JavaScript, I prefer React, but I can also work with Angular, jQuery, or vanilla JS • I can also develop macOS and iOS apps using Swift and Objective-C 🗼 Server Administration and DevOps • Familiar with Debian-based Linux distributions like Ubuntu • Able to handle VPS baremetal or Docker-based setups • Able to automate workflows using Bash, Python, GitHub Actions, and similar tools • Experienced with cloud services such as AWS and Azure 📊 Database • Microsoft SQL Server • MySQL / MariaDB • SQLite • PostgreSQL • Microsoft Access 💡 Skills • Strong in algorithm design and analysis • Great ability to solve programming and system trouble • Great at optimizing software performance • Flexible work style • Adaptive team player 📖 Self-Update • I regularly study new technologies to stay up to date. 🕰️ Flexible Availability • Open to collaborate across multiple time zones (US, CA, UK, EU, APAC, etc.) ✅ I’m not a robot. • I’m a real human and a solo freelancer, not an agency 🙌 Let’s Connect! • My name is Junian and I’d love to help bring your ideas to life • Feel free to reach out so we can discuss how I can support your project • Not a Vibe Coder, but use AI-Assisted Programming tools to solve problems • Linus Torvalds once said, “Talk is cheap. Show me the code.” So go ahead and check out my GitHub code. 🛠️ Common Tasks and Roles • Known as the Apple / macOS / iPhone guy • Build Windows app with .NET Framework & Windows Forms (WinForms) / Windows Presentation Foundation (WPF) / WinUI / Avalonia UI / MAUI / Xamarin • Build Windows Installer MSI / EXE from existing Windows App by using Wix / WixSharp • Build macOS app with Swift UI or .NET & Avalonia UI / MAUI / Xamarin • Build, sign, and notarize macOS app installer (PKG / DMG / ZIP) • Build web app with ASP .NET & Blazor / React / Angular / Vanilla JavaScript • Deploy and configure existing web apps by using Docker container to VPS / Cloud providers like AWS, Azure, or GCP • Ethical decompile / reverse engineer / source code retrieval / deobfuscation of existing .NET EXE / DLL / MSI or NinjaTrader Trading Indicator / strategy • Automate Windows UI tasks • Web scraping to retrieve online data / PDF / Images / any other files • Expert macOS system and app troubleshooting 🙋‍♂️ What I'm not • I'm not a Vibe Coder. Don't get me wrong, I use AI to build software, but I don't solely rely on it.

I’m a Software/AI & VPS Engineer, I can fix anything with zero mistakes n build everythings easily n fastest, i got unlimited Codex token, love to do things OpenClaw, Blockchain, Pipeline, flutter, flutterflow, build tools, Internal tools, Modules, Bot, PineScript, Mod, sys Linux n i can copy any site 100% match quick n easy n i strong in backend and full-stack systems and build Web apps, Mobile Apps, Desktop Apps, Rust/Tauri, Electron, Browser Extension n trading system, n strong Web3 edge (EVM, Stellar & Solana). I turn ambiguous ideas into secure, reliable, human-centered products using TypeScript/JavaScript, React/Next.js, Node.js/Nest, Go, Python, Solidity, Rust (Anchor), and modern infra. I care about clean architecture, measurable impact, and great developer experience (DX) also so features ship fast and safe, also love building an Apps & AI things. for the security side, I bring pentest/audit mindset to every build: threat modeling, fuzzing & invariants, automated checks in CI, and clear, actionable reports. I also provide English technical translation/localization for whitepapers, docs, and UI strings. Languages: TypeScript/JavaScript, Vue, Go, Python, Solidity, Rust (Anchor), Php, Ruby, C & C++ Frontend: React, Next.js, Tailwind, Radix/shadcn, Vite, SSR/SSG/ISR, Flutter Backend: Node.js (Nest/Express/Fastify), Go (Gin/Fiber), GraphQL, REST, gRPC, WebSockets Web3: Solidity, Rust/Anchor, Hardhat, Foundry, OpenZeppelin, viem/wagmi, ethers.js, WalletConnect v2, Safe, The Graph, IPFS Testing: Jest/Vitest, Playwright, Supertest, Foundry (fuzz/invariants), Slither, Echidna Data: PostgreSQL, MySQL, SQLite, Prisma/TypeORM/Knex, Redis DevOps: Docker, GitHub Actions, basic K8s, AWS/GCP basics, Sentry, OpenTelemetry, Tenderly, OpenZeppelin Defender Security: OWASP ASVS/API, RBAC/ABAC, token design, key/secret rotation, rate limiting & anomaly detection, audit reports DeFi staking: with upgradeable proxies storage-safe upgrades, 0 criticals in audit NFT marketplace royalty splits, subgraph indexing, gas-optimized listings Solana program PDA-secured escrow with CPI, wallet-adapter UX, >95% test coverage Payments & off-chain settlement Webhooks + queues, idempotent APIs, chargeback handling Security engagement BOLA/IDOR class bugs identified; implemented header-precedence fixes & authZ binding

5 years of experience in software development, particularly in Golang,Node.js,gRpc,kafka,SQL, Docker, Kubernetes, AWS(eks,s3,rds/postgres,cloudwatch) for Bank As a services, and i also have experience developing a Virtual Account project using the angular and java spring boot stack . I currently work as a Tech Lead Developer on bank-as-a-service applications that handle 200,000 transactions per day for disbursements.