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Arya G.

Tangerang, Indonesia

$20/hr
5.0
13 jobs

Hi, I'm Arya - a Senior Software Engineer with 5+ years building scalable backend systems for fintech, e-commerce, and enterprise platforms. I specialize in high-performance APIs, microservices architecture, and complex third-party integrations. What I deliver: ✅ High-scale backend systems: Architected systems handling 400-600 RPS with 99.9% uptime ✅ Complex integrations: UK HMRC Making Tax Digital, payment gateways, e-commerce platforms ✅ Performance optimization: 50-60% database latency reduction through query optimization ✅ Revenue-driving features: Built product integrations generating 100+ billion IDR monthly revenue Recent client work: UK Tax Integration - Implemented HMRC Making Tax Digital (MTD) ITSA integration for an accounting system, enabling automated tax reporting for self-employment and UK property businesses Dubai Media Platform - Developed backend for a directory-style app featuring local activities, magazine content, and gamification systems Database Optimization - Achieved 50-60% latency reduction on MariaDB/AWS RDS for a Symfony application through Doctrine query optimization Indonesian E-commerce - Led pay-later system integrations with Tokopedia, Shopee, TikTok Shop, Lazada, and Traveloka Core expertise: Backend: Java (Spring Boot), NodeJS, PHP (Laravel/Lumen/Symfony), REST APIs, microservices Databases: MySQL, PostgreSQL, MariaDB - query optimization & schema design Cloud & DevOps: AWS, GCP, Kubernetes, Docker, CI/CD pipelines Integration: Government APIs (HMRC), payment systems, e-commerce platforms Why clients choose me: Proven at scale: 5+ years at Indonesia's leading fintech (part of Djarum Group) International experience: UK, UAE, and Southeast Asian clients Complete delivery: Clean code, tests, documentation, deployment guidance Reliable communication: GMT+7 based, professional English, regular updates Industries: Fintech, E-commerce, Government/Tax, Media & Entertainment, SaaS Ready to build reliable, scalable backend solutions for your business. Let's discuss your project requirements.

  • Spring Boot
  • Laravel
  • TypeScript
  • Ubuntu
  • Java
  • GitLab
  • JavaScript
  • PHP
  • Golang
  • Node.js
  • React
  • Amazon Web Services
  • Linux
  • DevOps
  • Bash Programming
Michal K.

Gdynia, Poland

$55/hr
5.0
3 jobs

10+ years of experience crafting innovative systems for a diverse array of industrial applications. Providing value through automation and digitalization of manufacturing processes. Notable projects I've led: • Comprehensive digital transformation of a 100+ employee manufacturing company, implementing custom SCADA, WMS, MES, and ERP solutions • Development of software suite for robotic 3D printing, milling and polishing operations • Creating web platform for customizing and ordering 3D-printed concrete parts • Designing dozens of control systems for specialized machines across dairy, manufacturing and pharma industries Tech Stack: • .NET (C#) • Blazor / Vue.js + Quasar • MSSQL • Azure Cloud • PLCs / Microcontrollers • Delta / Siemens Control and Motion Systems • ABB Robots Systems that I deliver are: • Based on requirements collaboratively formalized with the client, adhering to best DDD practices • User-friendly, robust, and high-performing • Excellent value for investment I'm always eager to share my expertise while also exploring new domains and niches. I value long-lasting relationships with my clients - each one has continued working with me for years beyond the completion of their initial project. I take full responsibility for the projects I work on, delivering results that provide genuine value.

  • C#
  • .NET Core
  • Microsoft Azure
  • Blazor
  • Vue.js
  • ERP Software
  • Robotics
  • PLC Programming
  • SCADA
  • Manufacturing
  • API
  • SQL
  • Software Architecture & Design
  • Industry 4.0
Vu H.

Hanoi, Vietnam

$10/hr
5.0
10 jobs

Senior Fullstack Software Engineer | Java, Node.js, React | CMS & IoT Expert 🚀 About Me I am a Senior Fullstack Software Engineer with 4+ years of experience in developing high-performance web applications, CMS platforms, and IoT solutions. My expertise spans across Java Spring Boot, Node.js, React, Magnolia CMS, and cloud-based architectures. I have led teams, optimized complex systems, and built scalable solutions for enterprise-level clients. 🔹 Backend: Java Spring Boot, Node.js, NestJS, Microservices, GRPC 🔹 Frontend: React.js, React Native, Headless CMS 🔹 CMS: Magnolia CMS, Liferay, WordPress 🔹 Databases: MySQL, MongoDB, SQL Server 🔹 DevOps & Cloud: Docker, Kubernetes, GitLab CI/CD, AWS 🔹 IoT & AI: Zigbee, MQTT, OpenCV, AI-based detection systems 💼 Notable Projects ✅ MMP’s CMS Website: Built a Java Spring Boot-based CMS optimized for high traffic and large datasets. ✅ Dentsu’s Headless CMS: Developed a scalable API-driven CMS using Magnolia CMS and React. ✅ Yoolife & YooIOC Applications: Smart city applications for residential and operational management. ✅ IoT Platform for Smart Devices: Developed a gateway integrating Zigbee, Z-Wave, and BLE devices with AI-powered event detection. 🔍 Why Work With Me? ✔ Proven expertise in enterprise CMS solutions & IoT systems ✔ Strong problem-solving skills in system architecture & optimization ✔ Experience leading development teams & mentoring junior engineers ✔ Passionate about building scalable, high-performance applications Let’s connect and bring your ideas to life! 🚀

  • Ecommerce
  • Ecommerce Website
  • AWS IoT Core
  • Spring Boot
  • NestJS Development
  • Java
  • Embedded Linux
  • React
  • React Native
Khoi V.

Hanoi, Vietnam

$15/hr
5.0
1 jobs

Engineer 7+ years with AI mind set delivering growing and long-term products for clients across the US, Israel, Japan... across domains like eCommerce, Fintech systems, adTech platforms, and enterprise web integrations. • Enterprise Systems: Role-based, Tenant-based systerm, Authentication follow, Design system,.. • eCommerce: Product catalogs, checkout + order flows, inventory sync,... • AdTech: Campaign builders, analytics dashboards, API integrations,... • Web Integration: Payment integration, Twilio, Firebase, Google APIs, legacy system migration,.. BACKEND: Java 11–25 · Spring Boot 2 & 3 & 4 · Kotlin · TypeScript · NestJS · Quarkus · Microservices · REST API · Firebase FRONTEND React.js · Angular · Vue.js · TypeScript · JavaScript · HTMX AI FIRST NATIVE Claude · Codex · windsurf DATABASE & MIGRATIONS PostgreSQL · MySQL · MongoDB · Liquibase · Flyway SECURITY & DEVOPS OAuth2 · Keycloak · SonarQube · Docker · GitHub Actions · CI/CD THIRD-PARTY INTEGRATIONS Stripe · PayPal · Myfatoorah · Twilio · Telnyx · Google APIs · Firebase API · Algolia Search · reCAPTCHA 100% Job Success Long-term client relationships End-to-end ownership from dev → test → deploy. Let's discuss your project.

  • Java
  • Spring Boot
  • Angular
  • Vue.js
  • React
  • Node.js
  • TypeScript
  • MySQL
  • PostgreSQL
  • Docker
  • Amazon Web Services
  • CI/CD
  • Web Development
  • Hybrid App Development
  • AI Model Integration
  • Kotlin
Rifan M.

Bandung, Indonesia

$20/hr
5.0
13 jobs

I’m a Senior Software Engineer with 15+ years of experience building production web and mobile applications. My primary focus is frontend development, where I build scalable applications using clean architecture, reactive patterns, and strong performance optimization practices. I have extensive experience working with modern frameworks, especially Angular, and I apply consistent engineering standards to ensure maintainability and long-term scalability. In addition to web applications, I also develop cross-platform mobile apps using Ionic and Flutter. I integrate native mobile features such as biometric authentication and build device integrations including Garmin wearable devices. I am currently deepening my expertise in Flutter, actively building applications and expanding my mobile development capabilities while applying the same engineering principles used in production systems. My background also includes backend development using Go and PHP, working with microservices, REST APIs, and message queues. This allows me to understand the full system architecture and integrate frontend applications smoothly with backend services. For the past 3 years I have actively leveraged AI tools in my daily development workflow, which significantly improves development speed, debugging efficiency, and code quality. I use AI to accelerate coding, refactoring, troubleshooting, and building internal tooling while maintaining clean and maintainable production code.

  • Docker
  • Sass
  • Symfony
  • HTML
  • Laravel
  • Angular
  • PostgreSQL
  • Microservice
  • Kubernetes
  • PHP
  • TypeScript
  • AngularJS
  • JavaScript
  • Elasticsearch
  • CSS
  • Flutter
  • Ionic Framework
  • Apache Cordova
  • React
Ganesh V.

Pune, India

$35/hr
4.8
67 jobs

⚡ If your system needs to scale, stay secure, and actually work under real-world pressure I’m the person you bring in. I’m a Senior Full Stack Architect with 10+ years of experience designing and building enterprise-grade platforms, microservices ecosystems, and AI-powered applications. I don’t just build features I design systems that don’t break. 💼 What I Help You Achieve Most clients come to me when they face: • A system that’s slowing down or failing at scale • Poor architecture decisions causing long-term issues • Need to integrate AI into real business workflows • Backend that works… but isn’t reliable or secure • A product that needs to go from MVP → production properly 👉 I fix these by building clean, scalable, and production-ready systems from the ground up (or improving existing ones). 🧠 My Core Expertise 🔹 Backend & Architecture (My Strongest Area) • Java (Spring Boot, Spring Security, JPA, Hibernate) • Microservices & event-driven systems • API design & system integrations • Performance optimization & reliability engineering 🔹 Full Stack Development • Angular, React, Next.js • Scalable frontend architecture • Clean, maintainable UI systems 🔹 AI Integration (Where I Add Extra Value) • OpenAI, LangChain, LlamaIndex • RAG pipelines & semantic search • AI agents & workflow automation • Document intelligence systems 👉 I don’t just add AI I integrate it in a way that actually improves business outcomes. ☁️ Cloud & DevOps • AWS architecture & deployment • Docker & CI/CD pipelines • Scalable, distributed systems 🏆 Proven Track Record ✔ 100+ systems delivered (enterprise + startups) ✔ 15,000+ hours of real-world development ✔ Long-term client relationships & repeat work 💡 How I Work (This Is Why Clients Stay) • I think in architecture, not just code • I focus on long-term scalability, not quick hacks • I communicate clearly — no confusion, no guessing • I take ownership from planning → deployment • I build systems that are easy to maintain and extend 🎯 When You Should Hire Me ✅ You need a serious engineer, not just a coder ✅ Your system must be stable, secure, and scalable ✅ You want to integrate AI properly (not just hype) ✅ You care about long-term quality over shortcuts 🚫 Not a Good Fit If ❌ You’re looking for the cheapest option ❌ You need quick fixes without proper architecture ❌ You don’t value clean, maintainable code 🚀 Let’s Build Something That Lasts If you’re building a product where performance, scalability, and reliability actually matter Send me a message with your project details. I’ll quickly tell you the best way to approach it.

  • Java
  • Desktop Application
  • Software
  • Web Development
  • Mobile App Development
  • Front-End Development
  • Back-End Development Framework
  • Back-End Development
  • Front-End Development Framework
  • Full-Stack Development
  • Healthcare
  • Website
  • Software Development
  • Kotlin
  • React Native
  • AI Bot
  • LLM Prompt Engineering
  • Artificial Intelligence
  • Machine Learning
  • Flutter

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