Hire the Best Systems Engineer
in Vietnam

Overview: As a seasoned System Engineer with 7+ years of experience, I specialize in providing robust infrastructure solutions with expertise in Linux administration, DNS management, and Email Delivery. I am passionate about optimizing system performance, ensuring seamless operations, and implementing industry best practices. With a strong track record of delivering successful projects, I am dedicated to providing efficient and reliable solutions tailored to my clients' unique needs. Key Skills: ✅Linux System Administration: Ubuntu, CentOS, Debian | Server Setup, Configuration, and Optimization | Security Hardening | Performance Tuning | Shell Scripting ✅DNS Management: Zone Configuration | Record Management (A, CNAME, MX, etc.) | DNSSEC Implementation | BIND, PowerDNS, NSD ✅Email Delivery: Mail Server Setup (Postfix, Exim, Sendmail) | SMTP Configuration | SPF, DKIM, DMARC | Blacklist/Whitelist Management | Deliverability Optimization Services I Offer: System Administration: - Linux server setup, configuration, and maintenance. - System and network security hardening to safeguard against potential threats. - Performance optimization to enhance overall system efficiency. DNS Management: - DNS infrastructure setup, including domain registration, zone configuration, and record management. - Implementation of DNSSEC for enhanced security and validation. - Troubleshooting DNS-related issues and resolving them promptly. Email Delivery Solutions: - Mail server setup and configuration to ensure reliable email delivery. - Implementation of email protocols and best practices (SPF, DKIM, DMARC) to maximize deliverability and minimize spam. - Blacklist and whitelist management to maintain a clean reputation and avoid email delivery issues. Why Choose Me? - Extensive Experience: I have successfully completed 100+ projects, gaining in-depth knowledge and hands-on expertise. - Client Satisfaction: I maintain a stellar track record of positive feedback from satisfied clients who appreciate my professionalism, prompt communication, and ability to meet deadlines. - Solution-Oriented Approach: I analyze your requirements, devise tailored solutions, and implement best practices to address your specific needs. - Collaboration and Communication: I believe in transparent and effective communication, working closely with clients to ensure their vision is realized. ✅If you are looking for a reliable and skilled System Engineer who can optimize your infrastructure, streamline your DNS management, and enhance your email delivery capabilities, I am here to assist you. Let's discuss your project requirements and take your systems to new heights of efficiency and reliability.

Are you looking for a Senior Mobile Architect who doesn't just write code, but designs scalable, high-performance architectures, leads engineering teams, and bridges the gap between cross-platform frameworks and Native systems? I am a Senior Software Engineer with 9 years of professional experience, including over 5 years acting as a Mobile Architect and Tech Lead. My core specialization lies in building enterprise-grade React Native and Flutter applications, backed by a deep, production-tested foundation in Native iOS (using Swift) and Android (using Java). Having heavily operated in the Fintech and Banking domains, I excel at turning complex business requirements—such as Customer 360 dashboards, Lead or Campaign pipelines, and high-security eKYC systems—into seamless, secure, and production-ready mobile applications. 🚀 WHY PARTNER WITH ME? Cross-Platform Mastery with Native Performance: I deep-dive into React Native’s New Architecture (Fabric, TurboModules, JSI, and Codegen). If an open-source library doesn’t cut it, I build custom Native Bridges and standalone iOS or Android SDKs from scratch to handle heavy system-level processes. Fintech & Banking Domain Expertise: Extensive experience implementing high-security modules including eKYC via NFC (reading chipped ID cards), asset portfolios, secure data storage, data masking or encryption, and certificate pinning. AI-Driven Development Velocity: I leverage state-of-the-art AI tooling (Claude Code, Cursor, Custom Rules, and MCP to Figma automation workflows) to accelerate development speed by converting designs to clean, scalable code without sacrificing architectural integrity. Proven Leadership & Scalability: As a Tech Lead, I have designed Clean Architectures and Monorepo structures using Nx that reduced UI development time for entire engineering teams by 30 percent. 🛠 TECHNICAL SKILLS & TOOLKIT Cross-Platform & Core RN: React Native (TypeScript and JavaScript), Flutter, Advanced State Management (Zustand, TanStack Query), React Navigation, Reanimated. Native Mobile Engineering: Android (Java), iOS (Swift), Custom Native Modules, Mobile SDK Development (Behavior tracking, Inter-app messaging). Performance Engineering: Memory leak debugging, render optimization (useCallback, useMemo, handling large lists), Hermes engine, high-performance local storage (MMKV). Real-time Capabilities: Enterprise-grade real-time messaging (Social Inbox integration via WebSockets and Socket IO) featuring automated reconnection and state synchronization. Architecture & Infrastructure: Clean Architecture, Shared Component Ecosystems, Monorepos (Nx), Unit Testing (Jest), Firebase Crashlytics. Fullstack Capabilities: Web Frontend (Angular), Backend Ecosystems (NodeJS, Express, and NET). 💼 HIGHLIGHTED PROJECT EXPERIENCE 1. Enterprise Banking App & Customer Data Platform (CDP) Role: Mobile Architect & Tech Lead Impact: Architected the entire core mobile application using Clean Architecture and Nx Monorepos. Engineered an independent Native SDK (Swift and Java) for user behavioral tracking and inter-app communication. Key Features: Designed core banking modules (Leads, Opportunities, Customer 360, Asset Portfolios) and integrated secure eKYC via NFC chip scanning. 2. Real-Time Omnichannel Social Inbox Impact: Developed a real-time communication platform handling customer messages across multiple social channels (Facebook, Instagram, Zalo) via WebSockets, optimizing conversation distribution and offline synchronization. 3. Enterprise CRM Systems Role: Web & Systems Engineer Impact: Built and maintained robust internal backend services using NodeJS and NET, alongside enterprise web portals using Angular, cementing a strong foundation in high-scale systems. 🎓 EDUCATION & QUALIFICATIONS B.S. in Computer Science – Hanoi University of Industry (Good Degree Classification) Whether you need a rock-solid foundation for a brand-new banking application, a rescue mission for a laggy cross-platform app, or a technical leader to guide your mobile strategy, let’s jump on a call and bring your vision to life. Click "Invite to Job" or "Message" to discuss your project!

Hello! I’m Ben, a hardware and firmware expert with 8+ years of experience in designing hardware, programming embedded systems, and developing high-performance software solutions. My goal is to provide innovative, reliable, and high-performance solutions that meet your needs. With a strong track record on Fiverr (Level 2, 5 stars) and Upwork (Top Rated Plus, 5 stars), I have successfully delivered top-tier service to over 100 clients. What I Offer 1. End-to-End Embedded & Hardware Solutions - Advanced PCB Design & Hardware Development: Expertise in schematic capture, PCB layout, and multi-layer board design for reliable, high-performance, and manufacturable products. Experienced with KiCad, Altium, OrCAD, and Eagle. - High-Speed Design: Strong experience in 1–12 layer PCBs, including DDR3/DDR4/LDDR4, PCIe, USB (2.0/3.0/3.1/3.2), HDMI and 10/100/1000/10Gbase-T1 Ethernet. - Microcontrollers & SoMs: Firmware and hardware development for ARM Cortex-M3/M4 (STM32, ESP32, Nordic nRF52/53/91 series); custom boards for Raspberry Pi CM4/CM5, Orange Pi, iMX8, Jetson Nano/Xavier/Orin, RK3588, RK3568, RV1126, Allwinner, Zynq-7010. - Power & Hardware Integration: Experience in DC-DC, AC-DC, Buck, Boost, and Flyback converters, along with hardware design involving audio, RF modules, PA, LCD, filters, RFID, touch screens, and LVGL-based interfaces. - Prototype, Testing & Validation: Full support for board bring-up, debugging, validation planning, and functional testing to ensure hardware works reliably in real-world applications. - Manufacturing & Prototyping Support: Preparation of BOM, Gerber, and manufacturing-ready files, with hands-on support for prototype production and manufacturing through JLCPCB and PCBWAY. 2. Robust Firmware Development - Languages & Development: Strong embedded firmware development in C/C++, Python with experience using Visual Studio Code, STM32CubeIDE, Arduino IDE, ESP-IDF, and Segger. - Communication Protocols: Proficient in USB, UART, I2C, SPI, I2S, RS232, and RS485, enabling reliable communication across embedded systems and connected devices. - Wireless & Connected Systems: Experience with BLE, BLE Mesh, ZigBee, UWB, LoRa, NB-IoT, 4G LTE, Wifi, WiFi Mesh, and NFC for IoT and wireless product development. - Sensor: light sensor, CO, Smoke Sensor, Dust Sensor, Air Sensor, pH sensor, IMU sensor, Accelero, Gyro sensor,... - UI/UX for Embedded: Figma, TouchGFX, LVGL for STM32, ESP32, Raspberry Pi. - Motors Control: BLDC, Stepper, Servo, DC Motors - Robotics: Expertise in ROS/ROS2 for applications like AGV, AMR, 6-axis robots. Some of my product that I have designed and released to the market: - Home IP Camera: SoC-based design with DDR3 RAM, Ethernet/Wi-Fi streaming, CMOS image sensor, IR LED array, IR-cut control, USB, and MicroSD - Smart Home Products: Home Gateway with Ethernet, Wi-Fi, Zigbee, and TFT LCD; Smart Switch with capacitive touch, Zigbee, power metering, and AC load control - Tablet Mainboard: RK3399-based board with DDR3, eMMC, touch screen, LTE. - Smart Water Meter: BLE/Wi-Fi design with TI MCU. - Wearable Devices: Low-power wearable designs with wireless connectivity, sensors, and battery management - High-Performance ESC for Drones: Real-time motor control design for efficient and stable drone operation - Custom SBC with AI Module: Raspberry Pi-based SBC solutions with integrated AI capabilities And a lot of other products. With our experience and expertise, I’m confident I can provide tailored solutions to help you complete your project and release your product to the market . I look forward to the opportunity to work with you.

Know about MCU, SoC, ARM, SH, AVR, PIC, ESP, TI CC25xx, TI CC32xx, ESP32, ESP8266, etc. - Prototype Development kit: Arduino UNO R3, PIC16F887, ATmega128, MSP430 Starter kit, STM32F4 Discovery, Raspberry, Beagle Bone, etc. - Software: MS Visual Studio, Altium Designer, u-Vision Keil, Android Studio. - Have experience in programming languages such as C/C++, C#, Java - Have solid knowledge of the standard interface such as I2C, SPI, UART, CAN. - Have experience using debugging tools such as Segger Jlink, CAN bus analyzer (CL3000), Logic analyzer. - IoT devices with wireless connectivity such as LTE, CAT-M1, NB-IoT, LoRa/LoRaWAN, BLE, WIFI, ZigBee, NFC - Good experienced in AWS Service, AWS IoT, AWS Shadow, AWS Jobs. - Good experienced in Battery Management Systems based on BQ products from TI. - Good experienced with Audio Codec chips.

Enterprise Infrastructure & Network Security Engineer I help organizations build, secure, and troubleshoot enterprise IT infrastructure—from Cisco and Fortinet networks to VMware virtualization, Linux servers, and security monitoring platforms. Reliable IT infrastructure is the foundation of every successful organization. My role is to ensure that enterprise systems remain secure, stable, and available for the people who depend on them every day. Over the past several years, I have been responsible for operating and maintaining enterprise datacenter infrastructure for a large government organization. Working in a lean infrastructure team has given me hands-on responsibility across enterprise networking, virtualization, Linux and Windows servers, cybersecurity, monitoring, and infrastructure automation. I help organizations design, deploy, troubleshoot, optimize, and secure enterprise IT environments. Whether you need to troubleshoot a complex network issue, optimize VPN performance, deploy VMware infrastructure, secure Linux servers, or implement a SIEM solution, I focus on identifying the root cause and delivering reliable, long-term solutions. My expertise includes: • Cisco Enterprise Networking (Routing, Switching, VLAN, OSPF) • Fortinet (FortiGate Firewall, IPsec VPN, SD-WAN, High Availability) • VMware vSphere (ESXi & vCenter) • Linux Administration (Ubuntu, Rocky Linux) • Windows Server Administration • Wazuh SIEM & Security Monitoring • ELK / OpenSearch • Docker • Infrastructure Automation with Ansible • Enterprise Datacenter Operations I can help you with: ✔ Enterprise network troubleshooting ✔ Firewall deployment, migration, and optimization ✔ VPN performance optimization ✔ VMware deployment and administration ✔ Linux server administration and troubleshooting ✔ Wazuh SIEM deployment and tuning ✔ Infrastructure monitoring and security hardening ✔ Infrastructure automation ✔ Documentation and operational best practices I believe successful infrastructure is built on reliability, security, and maintainability not just getting systems to work today, but ensuring they continue to operate efficiently in the future. I value clear communication, well-documented solutions, and long-term partnerships with my clients. If you're looking for someone who understands enterprise infrastructure from networking and virtualization to Linux administration and security, If you're looking for an engineer who understands enterprise infrastructure as a complete ecosystem from networking and virtualization to Linux administration and cybersecurity. I look forward to helping you build a secure, reliable, and scalable IT environment. I particularly enjoy troubleshooting complex infrastructure issues, where identifying the real root cause is often more valuable than applying a quick fix.

AI founder building infrastructure for AI agents and developer tools. Currently building Stewie, a product intelligence layer that helps AI coding agents understand codebases, product requirements, and engineering context. Focus areas: - Agentic AI Systems - Context/Harness Engineering - AI Developer Infrastructure - LLM Applications - SaaS Architecture Background: Previously spent 10+ years in full-stack development across enterprise systems, fintech platforms, and cloud infrastructure, working across backend, frontend, DevOps, and system design. Current interests: - AI Infrastructure - Agent Architectures - Devtools - Early-stage AI products