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I turn a business process nobody has written down properly into a design an engineer can build — then stay through implementation. The one I point to most: a single sign-on ecosystem I designed and built for 2,600+ users across Java, PHP and .NET. 13+ years, mostly enterprise and public-sector systems. What that has looked like: • Single Sign-On ecosystem (PT Perkebunan Nusantara IV) — initiated and designed the ecosystem where no prior internal effort existed, built the Java EE core myself, and designed the Portal and Access Management components. Two phases, roughly three months, six people. Replaced separate logins for 2,600+ users across Java, PHP, and .NET applications. • Performance management rebuild (PT Perkebunan Nusantara IV) — led a seven-person team rebuilding an appraisal system on Java EE, Service-Oriented Architecture, and SQL Server stored procedures. Four months, around 600 executive users. The data and performance failures reported against the previous version did not recur in the observed appraisal period. • Customs import integration (PT Teknoglobal) — built two Java EE flat-file parsers plus document-validation and multithreaded background-processing services for a national customs system, consuming import and banking data delivered through an IBM MQ messaging layer. I owned those modules; I did not build the messaging infrastructure and I did not lead the wider project. • Mobile content ecosystem, 2023–2026 — architected and led the v2 backend rebuild after the original could not scale past inconsistent data and a schema that resisted new features. Designed the database, coded the core processing, and led a team of QA, mobile, and web developers. A compatibility API let existing clients run against the new backend, so the cutover carried users across without significant disruption. • Most recently — specified and led a C#/.NET 8 WPF refactoring that separated the user interface from background services over gRPC, then built a REST-based Cloud Sync worker linking the desktop client to a Next.js platform. I handed that work over on completion of my scope in July 2026; the client team continues development. Since August 2026 I work independently under my own trade name, currently delivering a landing page and registration flow for a member-based organization (Go, MariaDB). Where I am useful: enterprise integration, single sign-on and access flows, internal tools and workflow systems, procurement and ERP-adjacent processes, legacy modernization, and backend work in Java, C#/.NET, or PHP/Laravel. Where I am not: SAP configuration or ABAP, mobile-first product design, data science, and anything requiring a cloud architecture certification I do not hold. I work to an agreed schedule, put delivery risks in writing early, and tell you when something I designed turns out to be wrong.

Upwork Profile Summary Results-driven IT Project Manager and C# .NET Developer with proven success in delivering complex web application projects and leading system implementations from planning to deployment. Over the course of my career, I have successfully managed and delivered 5 full-scale system implementation projects, ensuring seamless integration, stakeholder satisfaction, and measurable business improvements. ✅ What I Bring to Clients - Web Application Expertise: Skilled in building scalable, secure, and user-friendly applications using C# .NET and modern frameworks. - Project Leadership: Experienced in managing cross-functional teams, coordinating stakeholders, and delivering projects on time and within budget. - System Implementation: Hands-on experience guiding organizations through end-to-end system rollouts, from requirements gathering to post-launch support. - Workflow Optimization: Strong ability to streamline processes, improve efficiency, and align technology solutions with business goals. 🚀 Achievements - Delivered 5 enterprise-level system implementations, each improving operational efficiency and user adoption. - Led web application projects that enhanced client productivity and reduced manual workloads. - Consistently recognized for clear communication, structured project planning, and technical problem-solving. 🤝 Why Work With Me I combine technical depth with project management expertise, ensuring not only that your application works flawlessly but also that the entire project runs smoothly. My approach is collaborative, transparent, and focused on delivering results that matter to your business. Let’s collaborate to bring your project vision to life — message me today to discuss how I can help.

A reliable & committed software engineer for long-term collaboration. Current record, 10 years managed a client. My principle: honesty & integrity are equally important as skill. Hi, I’m Budi, a senior software engineer, Agentic AI developer & DevOps. If you need someone to built product web based, AI powered or managing server/deployment. I can help. Need something urgent? Invite me and guaranteed response within 1 day. Technologies built - Car Hire Booking Engine, GIS/GPS/Coordinate, Microservices, Infrastructure as code, Data Synchronize, DevOps, SDK/Third Party API integration. - Insurance Product, Secure Data Strict Policy, OAIC/GDPR compliance. My technology stacks: - Languages: PHP, TypeScript, Go, Python, Python. - Frameworks: Laravel, Symfony, FastAPI, Next.js, Node.js. - AI/Agentic Frameworks: LangChain, LangGraph, LangFuse, FactMCP , RAG, n8n. - Cloud & Infrastructure: AWS, Docker, Kubernetes, CI/CD, Distributed Systems. - Data & Querying: MySQL, PostgreSQL, Redis, Pinecone, GraphQL, REST API, XML, SOAP.

🚀 Need someone who can build, automate, or optimize your digital product—and handle the details along the way? That’s what I deliver. I specialize in Unity apps/games, full-stack web platforms (React.js, Node.js, APIs), and mobile solutions, backed by years of experience as a Lead Programmer & CTO. From backend systems to front-end experiences, I ensure your product is not just built—but built to last. Beyond development, I also support clients with data entry, automation, and workflow setup, so you can focus on the big picture while I handle both the complex and the essential tasks. 👉 Whether you need a full build, technical consultation, or reliable support, I’ll help turn your vision into a working solution. Let’s connect.

Stuck with a legacy .NET or PHP system nobody wants to touch, a third-party integration that keeps breaking, or a mobile app that needs to ship without slowing down your web platform? I build and maintain production systems that hold up under real business use - enterprise software, web platforms, and mobile apps that don't fall over as they grow. Hi, I'm Yusrizal 👋 Senior Full-Stack Developer with 18+ years of experience across EdTech, government, energy, and healthcare. Top Rated on Upwork, 100% Job Success, 90+ companies served. I've solved problems like: - Cut redundant authentication requests ~60% by adding Redis caching to a production auth service for Pertamina, Indonesia's national energy company - Built a national partnership-data platform for Indonesia's Ministry of Education to manage vocational-education partnerships - Automated a PHP microservice that parses real-time XML feeds to keep product pricing and discounts in sync across systems - Integrated a government digital-signature API (PERURI) so a state polytechnic could issue legally valid digital diplomas - Replaced fingerprint check-in with a React Native attendance app for remote staff - Founded and led an EdTech startup (school management/LMS) that won a national tech-incubation award What I can help you with: - Enterprise & Backend Systems → C#/.NET (Core, Framework, ASP.NET) + SQL Server for business-critical systems - Web Platforms & APIs → PHP (Laravel, Yii2, CodeIgniter) + MySQL/PostgreSQL, REST API design and integration - Mobile Apps → React Native + Firebase/Expo, cross-platform iOS/Android - Payments & Integrations → Midtrans, PayPal, CryptAPI, government APIs, XML feeds, IoT data - Performance & Reliability → caching (Redis), query/API optimization, cutting redundant load - Cloud & Deployment → AWS (S3, EC2, Amplify), DigitalOcean, Git Tech I use (when it actually fits the job): - Backend: C# / .NET (Core, Framework, ASP.NET), PHP (Laravel, Yii2, CodeIgniter), Node.js - Frontend/Mobile: React, React Native, Expo, Firebase - Database & Caching: SQL Server, PostgreSQL, MySQL, NoSQL, Redis - Integrations: REST APIs, Midtrans, PayPal, CryptAPI, PERURI, XML, IoT - Infra: Microsoft Azure, AWS (S3, EC2, Amplify), DigitalOcean, Git - AI-assisted workflow: Claude, GitHub Copilot, ChatGPT, DeepSeek - Collaboration: Jira, Trello, Agile How I work: - I focus on delivering working systems, not just code - Comfortable owning a project end-to-end (requirements → architecture → deployment) or slotting into an existing team - AI-assisted development helps me move faster - every change still gets reviewed and tested the same as it would without it - I pick the simplest stack that will actually hold up in production, not the trendiest one - 18+ years means I've led teams (as a startup CEO and as a platform lead) and worked solo - I adapt to what the project needs I take on projects I'm confident I can deliver well. If you need .NET, PHP, or React Native work - building something new, or fixing and scaling an existing system — send me a message and let's talk specifics. 🚀

I help clients turn game ideas into scalable Unity products, from prototype to live production, including backend, multiplayer, and deployment. I’m a Unity developer with 10+ years of experience working on mobile, web, and PC games. I don’t just build the client side, I also design backend systems, multiplayer architecture, and game economies. I also build AI-powered tools and workflows using agents (e.g., Codex with MCP), enabling automation, tool integration, and smarter development pipelines. I’ve worked on multiple shipped projects across mobile, WebGL, and PC, including multiplayer and backend-heavy systems. Core Expertise: • Unity (Android, iOS, WebGL, PC) • Multiplayer (Photon, SmartFoxServer) • Backend (Java / ASP.NET Core + MongoDB) • Blockchain integration (EVM, zkEVM) What I can deliver: • Full game development (client + backend) • Scalable backend and game logic • Real-time multiplayer systems • Deployment and CI/CD pipelines • Dashboard for custom management ❝Tim delivers beyond expectations and brings clarity to complex projects.❞ If you have a game idea or need help scaling your project, feel free to reach out. I’m happy to discuss the best approach for your case. Best regards, Timothy Hermawan