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Are you looking for a seasoned expert in cross-platform mobile app development using Flutter? Look no further! 🔧 My Expertise: I excel in crafting high-quality cross-platform mobile apps using Flutter. I am well-versed in various design patterns, including BLoC, Provider, and GetX, and I'm fluent in programming languages such as Dart, Swift, Java, Objective-C, and JavaScript. Additionally, I have extensive experience with essential mobile frameworks like In-App Purchases, Maps, Camera, and Push Notifications. 📦 Third-Party Integration: I bring a wealth of experience in integrating third-party SDKs, making your app feature-rich and interactive. Some of the SDKs I've successfully integrated include Facebook, Stripe, Google Maps, AdMob, and more. 📊 Quality and Scalability: My commitment to quality is unwavering. I create apps that are not only responsive but also rigorously tested across a wide range of devices. I pride myself on delivering well-architected, well-documented, and easily maintainable projects, ensuring that your app can grow and adapt as your company does. ✅ My Skill Set: Languages: JavaScript, Dart, Java, Swift, Objective-C Platforms: Flutter, Android, iOS Familiar with SDKs & Tools: Firebase, Stripe, Mapbox, Google Maps, Facebook, Twitter, LinkedIn, and more Environments: Proficient in Windows and MacOS Version Control and Project Management: Bitbucket, Github, Jira, Trello, and others 💼 Let's Collaborate: If you're looking for a Flutter developer who can turn your app ideas into reality, I'm ready to discuss your project and bring it to life. My commitment to excellence and a track record of successful projects make me the ideal choice for your mobile app development needs. Let's build something great together!

Most dev shops ship isolated features. We build the core systems that run your day-to-day operations, and we stay accountable for outcomes, not just output. I'm Jack, CEO of NUS Technology. Since 2013 we've been a co-located team in Vietnam building operations platforms, integrations, and automation for founders and operators across Australia, the US, and Europe, on products where performance, maintainability, and business alignment actually matter. WHY CLIENTS CHOOSE US - Top Rated Agency on Upwork, 98%+ Job Success Score since 2013, 4.8/5.0 average rating - $10M+ in project value delivered - Long-term partnerships: many clients have worked with us for 5-10+ years - 90+ people co-located: 60+ web developers, 15+ mobile developers, plus QA, BAs, PMs, and designers WHAT WE DO BEST Operations platforms (our core) We design the central system that orchestrates bookings, payments, teams, hardware, and compliance into one seamless operation: software that bends to your process, not the other way around. We handle the integrations Zapier can't and SaaS avoids: deep data synchronization, legacy platforms, and compliance-grade audit trails where failure isn't an option. Everything that supports it - Web: Ruby on Rails (deep expertise, high-traffic systems, complex domains), React, Next.js, Vue.js, TypeScript, Node.js, PHP (Laravel, Symfony), Python (Django, Flask), REST and GraphQL APIs - Mobile: native (Swift, Kotlin) and cross-platform (React Native, Flutter) - Cloud & DevOps: AWS, Google Cloud, Heroku, CI/CD, Docker, monitoring, cost and scale tuning - eCommerce: Shopify (themes, apps, API integrations, migrations), Spree, Saleor, and custom builds HOW WE WORK - Outcome-driven: we focus on business results, not just shipping code - Ownership mindset: we act like a technical co-founder, not a contractor - Proactive: we surface technical debt and scaling bottlenecks before they escalate - Clear communication across time zones (we're GMT+7, with strong overlap for AU and partial US/EU) - Long-term thinking: we build systems that scale, not quick hacks that break later HOW YOU CAN WORK WITH US 1. Operations platform development: internal platforms, SaaS, workflow automation, complex integrations, replacing fragmented tools with a unified system 2. Dedicated engineering teams: backend, frontend, mobile, and QA engineers as an extended team, often for multiple years 3. Product development & MVPs: from idea to launch, fast but not fragile If you're looking for a team that thinks beyond code, challenges assumptions, and builds something that actually lasts, let's talk.

With over 7 years of experience in the IT industry, I bring a strong blend of expertise in DevOps, cloud solutions, networking, and system administration to drive high-impact technology projects. My journey spans 1+ years in Network Engineering and System Administration and 7+ years in DevOps, ensuring seamless execution of IT solutions tailored for scalability, efficiency, and resilience. DevOps & Cloud Expert I specialize in Agile, leveraging AWS, GCP, DigitalOcean, and Oracle Cloud to design and implement cutting-edge cloud architectures. My deep expertise in CI/CD pipelines using Jenkins, GitLab CI, GitHub Actions, and Cloud DevOps streamlines development workflows, significantly enhancing efficiency and reliability from code commit to deployment. ✔️ Cloud Platform: AWS, GCP, Oracle & Digital Ocean ☁️ ✔️Containers: Docker & Docker compose 🫙 ✔️Container Orchestration: Docker Swarm, Kubernetes & EKS 🎷 ✔️Kubernetes Application: Helm Charts & Kustomize ⚓️ ✔️Continuous Integration/Deployment: GitLab CI, Jenkins & GitHub Actions ⚒️ ✔️GitOps : ArgoCD 🚀 ✔️Configuration Management: Ansible ⌨️ ✔️Infrastructure as a Code: Crossplane, Terraform, Terraform Cloud ✔️ Programming and Scripting: Bash and Python3 👨‍💻 ✔️Logging, Monitoring & Alerting: ELK, Zabbix,Datalog , Grafana, Prometheus, Alert Manager & Loki 🔍 ✔️Operating Systems: Linux (RHEL & Debian) & Unix Systems 💻 ✔️SIEM Tools: Panther ✔️Technologies: AWS SAM, Serverless Framework, Serverless applications development & Microservices applications deployment 🎯 ✔️VCS: GitHub, GitLab & BitBucket 🗃️ ——————————————————————- Linux System Administration & Cloud Solutions Expert I specialize in Linux/UNIX system administration across Ubuntu, Debian, and CentOS. My expertise includes network services like DNS, DHCP, and firewalls, along with virtualization using VMWare ESXi, KVM, Proxmox, and Docker. I manage secure email and web servers with Postfix, Dovecot, Nginx, and Apache2, ensuring efficient communication and load balancing. I automate system backups and manage databases such as MySQL and PostgreSQL. With experience in cloud services like AWS, Google Cloud, and DigitalOcean, I design scalable cloud architectures and facilitate seamless server and email migrations.

𝗜 𝗛𝗲𝗹𝗽 𝗙𝗼𝘂𝗻𝗱𝗲𝗿𝘀 𝗩𝗮𝗹𝗶𝗱𝗮𝘁𝗲 𝗕𝗲𝗳𝗼𝗿𝗲 𝗧𝗵𝗲𝘆 𝗕𝘂𝗶𝗹𝗱 — 𝗦𝗼 𝗧𝗵𝗲𝘆 𝗗𝗼𝗻’𝘁 𝗪𝗮𝘀𝘁𝗲 𝗧𝗶𝗺𝗲 𝗢𝗿 𝗠𝗼𝗻𝗲𝘆 𝗕𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗧𝗵𝗲 𝗪𝗿𝗼𝗻𝗴 𝗣𝗿𝗼𝗱𝘂𝗰𝘁 🚫⏳ 🚫💸 🚫 Not just prototypes. 🚫 Not just demos. ✅ Real products that can grow. Over the last 7+ years, I’ve been working as a full-stack engineer and backend architect building SaaS platforms, AI tools, and automation systems for startups and product teams. 🏆 I’m also a 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 freelancer on Upwork trusted by companies across: • 🇺🇸 United States • 🇦🇺 Australia • 🇨🇦 Canada • 🇸🇬 Singapore • 🌏 Southeast Asia ━━━━━━━━━━━━━━━━━━ 🚀 𝗪𝗵𝗮𝘁 𝗜 𝗱𝗼 𝗯𝗲𝘀𝘁 I build AI-powered SaaS products and scalable platforms from idea to production. Typical journey I support: ⚡ Concept → MVP → Production → Scale Many founders reach out to me when they are building: ◆ 🤖 AI SaaS platforms ◆ 🧠 LLM-powered applications ◆ ⚙️ automation systems ◆ 🏪 SaaS marketplaces ◆ 📈 scalable startup platforms ◆ 🏢 enterprise web applications My focus is always the same: build stable systems that support real users. ━━━━━━━━━━━━━━━━━━ 🤖 𝗔𝗜 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 𝗜 𝗯𝘂𝗶𝗹𝗱 ◆ 🧠 LLM applications powered by OpenAI ◆ 🔎 RAG pipelines for knowledge systems ◆ ⚡ AI automation workflows ◆ 🎯 AI recommendation & matching engines ◆ 📄 document AI and semantic search systems These are not experimental demos. They are designed for real production products. ━━━━━━━━━━━━━━━━━━ 🏗 𝗙𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 My development philosophy is backend-first engineering. I focus on systems that are: ⚡ scalable 🧱 maintainable 🚀 high-performance 🔐 secure ━━━━━━━━━━━━━━━━━━ ⚙️ 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝘀𝘁𝗮𝗰𝗸 ◆ ASP.NET Core (.NET 6+) ◆ Node.js ◆ NestJS Architecture: ◆ Clean Architecture ◆ SOLID principles ◆ Microservices systems ◆ CQRS & MediatR patterns Infrastructure: ◆ Hangfire — background processing ◆ SignalR — real-time systems Data layer: ◆ PostgreSQL ◆ SQL Server ◆ Redis caching ◆ FusionCache two-level caching Security: ◆ JWT authentication ◆ OAuth integrations ◆ Role-based authorization (RBAC) DevOps: ◆ CI/CD pipelines ◆ GitHub Actions ◆ Azure DevOps ━━━━━━━━━━━━━━━━━━ 🎨 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝘀𝘁𝗮𝗰𝗸 ⚛ React ⚡ Next.js 📘 TypeScript UI systems: ◆ TailwindCSS ◆ Material UI ◆ Ant Design Focus areas: 🚀 performance optimization 📊 SEO optimization ⚡ scalable frontend architecture ━━━━━━━━━━━━━━━━━━ 🎯 𝗪𝗵𝗲𝗿𝗲 𝗜 𝗮𝗱𝗱 𝘁𝗵𝗲 𝗺𝗼𝘀𝘁 𝘃𝗮𝗹𝘂𝗲 Many founders contact me when: ◆ their MVP is unstable ◆ their product is half-built ◆ their previous developer disappeared ◆ their system cannot scale ◆ their AI prototype needs real engineering Often the product started with tools like: ◆ v0 ◆ Lovable ◆ Replit ◆ no-code builders That’s completely fine. But when the system needs real architecture, performance, and stability, I step in to rebuild or scale it properly. ━━━━━━━━━━━━━━━━━━ 📊 𝗥𝗲𝘀𝘂𝗹𝘁𝘀 𝗜’𝘃𝗲 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 📈 SaaS platforms used by 10,000+ users ⚡ reduced API latency by 70% using Redis caching 🤖 AI automation systems saving teams 20+ hours per week 🚀 delivered startup MVPs in 4–8 weeks ━━━━━━━━━━━━━━━━━━ 𝗛𝗼𝘄 𝗜 𝘄𝗼𝗿𝗸 Clients enjoy working with me because I think like a product engineer, not just a coder. My approach: 🗣 clear and direct communication 🧠 architecture-first thinking 💰 business-driven technical decisions 💡 proactive product suggestions 📈 long-term scalability mindset ━━━━━━━━━━━━━━━━━━ 𝗜 𝗱𝗼𝗻’𝘁 𝗷𝘂𝘀𝘁 𝘄𝗿𝗶𝘁𝗲 𝗰𝗼𝗱𝗲. I design systems that support real users, real traffic, and real business growth. ━━━━━━━━━━━━━━━━━━ If you're building an AI SaaS or startup product, feel free to reach out. Send me a message with: 💡 your idea 🧱 your current progress ⚠ the biggest technical challenge you’re facing I’ll tell you honestly whether I can help and how we can move forward.

✅ 𝗔𝗪𝗦 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗲𝗱 𝗗𝗲𝘃𝗢𝗽𝘀 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿 – 𝗣𝗿𝗼𝗳𝗲𝘀𝘀𝗶𝗼𝗻𝗮𝗹 | ⭐ 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 | ⭐ 𝟱★ 𝗥𝗲𝘃𝗶𝗲𝘄𝘀 | ✅ 𝟭𝟬+ 𝗬𝗲𝗮𝗿𝘀 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 💬 𝙊𝙑𝙀𝙍𝙑𝙄𝙀𝙒 I help companies build scalable AWS infrastructure, deploy AI systems, and reduce cloud costs by 30–50%. If you're dealing with high AWS bills, slow deployments, or unreliable systems, I can design and implement production-ready solutions not prototypes. With 10+ years of experience and multiple certifications, I specialize in AWS DevOps, AI infrastructure, and automation for real-world systems at scale. 🚀 𝙒𝙃𝘼𝙏 𝙄 𝘿𝙊 ☁️ 𝘼𝙒𝙎 𝘿𝙀𝙑𝙊𝙋𝙎 & 𝘾𝙇𝙊𝙐𝘿 𝘼𝙍𝘾𝙃𝙄𝙏𝙀𝘾𝙏𝙐𝙍𝙀 ► Scalable infrastructure (EC2, VPC, RDS, S3, Lambda) ► CI/CD pipelines (GitHub Actions, Jenkins, CodePipeline) ► Infrastructure as Code (Terraform, CloudFormation) ► Docker & Kubernetes deployments ► Monitoring & logging (CloudWatch, Grafana) ► Security architecture & IAM management 🤖 𝘼𝙄 & 𝙇𝙇𝙈 𝙄𝙉𝙁𝙍𝘼𝙎𝙏𝙍𝙐𝘾𝙏𝙐𝙍𝙀 ► Deploy LLM apps (AWS Bedrock, OpenAI, Azure OpenAI) ► Build RAG pipelines and AI knowledge systems ► Vector databases (OpenSearch, Pinecone, pgvector, Chroma) ► Multi-agent AI systems and tool integrations 🧠 𝘼𝘿𝙑𝘼𝙉𝘾𝙀𝘿 𝘼𝙄 𝙀𝙉𝙂𝙄𝙉𝙀𝙀𝙍𝙄𝙉𝙂 ► Context Engineering (prompt design, memory, retrieval optimization) ► Harness Engineering (evaluation, testing, monitoring AI systems) ► AI workflow automation (LangChain, LlamaIndex, Step Functions) ► AI agents connected to APIs, databases, and Slack 📊 𝘿𝘼𝙏𝘼 𝙀𝙉𝙂𝙄𝙉𝙀𝙀𝙍𝙄𝙉𝙂 & 𝘼𝙐𝙏𝙊𝙈𝘼𝙏𝙄𝙊𝙉 ► Data pipelines (Glue, Athena, Spark, Airflow) ► Data lake and analytics architecture ► SQL / NoSQL systems (MySQL, PostgreSQL, DynamoDB, MongoDB) ► Reporting and analytics systems 💼 𝙀𝙓𝙋𝙀𝙍𝙄𝙀𝙉𝘾𝙀 ► Managed AWS infrastructure with $30k+/month spend (cost optimized) ► Built AI systems using AWS Bedrock + Lambda in production ► Designed CI/CD pipelines for containerized applications ► Architected data lake platforms (EMR, Glue, Athena) ► Automated DNS, infrastructure provisioning, multi-environment deployments ► Implemented IAM Identity Center for centralized access control 🧰 𝙏𝙀𝘾𝙃 𝙎𝙏𝘼𝘾𝙆 ☁️ Cloud: AWS, Azure ⚙️ DevOps: Docker, Kubernetes (EKS), ECS, Terraform, CloudFormation 🚀 CI/CD: GitHub Actions, Jenkins, AWS CodePipeline 🤖 AI/LLM: AWS Bedrock, OpenAI, Claude, LangChain, LlamaIndex, MCP, RAG, Vector Databases 📊 Data: MySQL, PostgreSQL, SQL Server, MongoDB, Redis, DynamoDB, OpenSearch 💻 Languages: Python, Bash, SQL, REST APIs 🏆 𝘾𝙀𝙍𝙏𝙄𝙁𝙄𝘾𝘼𝙏𝙄𝙊𝙉𝙎 ► AWS Certified DevOps Engineer – Professional ⭐ ► AWS Certified Solutions Architect ► AWS Certified Data Analytics – Specialty ► AWS Certified Security – Specialty ► Microsoft Azure Administrator Associate ► Cisco Certified Network Associate (CCNA) (Certificates available in Portfolio for verification) 💡 𝙒𝙃𝙔 𝘾𝙇𝙄𝙀𝙉𝙏𝙎 𝙒𝙊𝙍𝙆 𝙒𝙄𝙏𝙃 𝙈𝙀 ✔ Production-ready systems (not prototypes) ✔ Strong cost optimization mindset ✔ Clear communication and reliable delivery ✔ Fast response and problem-solving focus 💬 𝙇𝙀𝙏’𝙎 𝙏𝘼𝙇𝙆 If you need help with AWS, DevOps, or AI infrastructure, feel free to reach out. Available for long-term and short-term projects.

I'm a DevOps Engineer with 5 years of experience working with startups and enterprises. What You Can Expect: • I don’t just set up infrastructure, I build systems designed for long-term success • I prioritize secure and sustainable approaches rather than taking shortcuts • I communicate effectively with both technical and non-technical clients • I respond quickly during incidents and stay involved until everything is fully resolved Credentials: • Top Rated on Upwork with 100% Job Success Score • AWS Certified Solutions Architect - Associate (SAA) Whether you need a fresh setup or want to improve your existing systems, I'm always ready to deliver reliable solutions that meet your needs. For Infrastructure: • Architect security, resilience, and cost efficiency cloud infrastructure • Developed Infrastructure as Code using Terraform combined with automation tools • Set up monitoring, logging, and alerting systems for full visibility For Deployment: • Deploy applications to Docker, Kubernetes, or traditional Linux servers • Implement CI/CD pipelines with automated testing and security validation • Migrate applications across cloud and VPS/hosting environments without data loss • Refactor and deploy AI-generated applications to production-ready environments For Ongoing Operations: • Troubleshoot and resolve both infrastructure and application issues • Continuously monitor system health, responding to incidents within minutes • Provide long-term server maintenance, including security updates and system patching My Tech Stack: • Languages: JavaScript, TypeScript, Python, PHP, Java • Scripting: Bash, PowerShell, Python • Web Servers: Apache, NGINX, IIS • Databases: MySQL, PostgreSQL, MongoDB • Cloud & Infrastructure: AWS, GCP, VPS/Hosting • Infrastructure as Code (IaC): Terraform, Terragrunt, Ansible • Containers & Orchestration: Docker, Kubernetes, Helm • CI/CD & GitOps: GitHub Actions, GitLab CI/CD, Jenkins, Argo CD • Monitoring & Observability: Prometheus, Grafana, Datadog, Zabbix If you think I'm a good fit for your project, feel free to reach out anytime. I truly value long-term partnerships built on trust and quality.