Expert in Email Configuration, Authentication & IT Systems Administration | 11+ Years Experience I am a highly skilled IT Systems Administrator with 11+ years of experience in email configuration, authentication, deliverability, domain management, and IT infrastructure. I specialize in setting up, managing, and troubleshooting business email systems, ensuring secure, high-deliverability email communication. 💡 Email System Configuration & Management ✔ Google Workspace (Gmail for Business), Microsoft 365 (O365), Zoho Mail and many other email platforms. ✔ Mailgun, SMTP, Postfix, Exim & Other Email Relay Services ✔ Transactional & Marketing Email Setup (Mailgun, SendGrid, Instantly.ai, Lemlist, etc.) ✔ Custom Email Domain Setup, Migration & Troubleshooting 🔐 Email Authentication & Security ✔ SPF, DKIM, DMARC Implementation & Optimization ✔ BIMI & MTA-STS Setup for Brand Protection ✔ Reverse DNS (PTR Records) & Dedicated IP Configuration ✔ SMTP Authentication & Secure Email Protocols (TLS, SSL) 🚀 Email Deliverability & Optimization ✔ Inbox Placement & Avoiding Spam Filters ✔ IP Reputation Monitoring & Blacklist Removal ✔ Domain Warm-up & Cold Email Best Practices ✔ Google Postmaster Tools & Microsoft SNDS Configuration 🌍 Domain Management, DNS Setup & Hosting Services ✔ Domain Registration & Transfer Management ✔ DNS Configuration (A, CNAME, MX, TXT, SRV, PTR Records) ✔ Hosting Setup & Migration (cPanel, Plesk, Cloudflare, AWS, etc.) ✔ CDN Integration & Performance Optimization 🖥️ IT Infrastructure & Systems Administration I also have deep expertise in IT systems administration, virtualization, and troubleshooting, including: ✔ Microsoft Windows Server (Setup, Management & Troubleshooting) ✔ Microsoft Hyper-V & VMware (Virtualization & Failover Clustering) ✔ WSUS (Windows Server Update Services) for Patch Management ✔ Linux OS Installation & Server Configuration ✔ Remote IT Support for Windows, Linux & VMware With my proven track record in IT infrastructure, email solutions, and domain management, I help businesses streamline operations, secure communication, and optimize system performance. 💬 Let’s discuss how I can improve your email setup, IT systems, and domain management!

🌟 Top-Rated Mobile App Developer | Android • iOS • VPN • IoT Hello! I'm Shahzain Ali, a Mobile & Desktop App Developer with 8+ years of experience building high-quality Android, iOS, desktop, wearable, and VPN applications. I specialize in Kotlin, Swift, Java, Python, and C++ (Qt) — delivering fast, reliable, and scalable solutions for clients worldwide. 💼 What I Do ✔ Android Development: Kotlin, Java, Jetpack, Room, Maps, Sensors ✔ iOS Development: Swift, SwiftUI, Authentication, In-App Purchases ✔ Desktop Apps: Python (Tkinter), C++ with Qt Framework ✔ Watch Apps: WearOS, watchOS, Samsung Tizen ✔ VPN Expert: OpenVPN & WireGuard integrations for Android, iOS & Desktop ✔ IoT & Embedded: BLE, Arduino, ESP32, NodeMCU, sensor integrations ✔ Cloud & Serverless: Firebase Auth, Storage, Realtime DB 🛠️ Tech Stack Languages & Tools: Swift, Kotlin, Java, Python, C++, SwiftUI, CMake, Android Studio, Xcode, Qt, Tkinter Databases: SQLite, Room, Realm APIs & Integrations: Google, Facebook, Stripe, PayTabs, Maps, Biometric Auth 🌍 Why Clients Choose Me 70+ mobile apps delivered for clients in the USA, Germany, UK, UAE, and beyond Strong knowledge of MVC, MVVM, clean architecture Deep expertise in payment systems, authentication, and geolocation Excellent communication, fast delivery, and clean, maintainable code Developer community contributor with 200K+ reach on StackOverflow ✨ Client Testimonials “Perfect developer, adheres to schedule, highly motivated specialist for any complex task. Will hire again for sure.” “Good experience working with Ali. He has a great attitude and does his best to help.” If you're looking for a reliable, experienced developer who understands both mobile and system-level technologies, let's work together to build something amazing.

I am a computer science student with extensive background in iot security and networking, I’m head of IEEE security branch in PUA, an excellent communicator and I’m extremely dedicated when I join a project. My skills include excellent communication and documentation, I can write academical papers with ease, as evidenced by my IELTS grade. I adhere to agreed upon prices and usually don’t charge per hour. I won’t take a job unless I can guarantee I can do it, additionally, if you’ve found yourself in need of a quick learner that’s where I shine the most. I’ve developed my own PoS system forked from ospos and currently working on integrating it with odoo for seamless integration without fully migrating to odoo. Excellent with wuick scripts, dirty work and the like- if you are on a budget and would like to keep the spendings to a minimum, I’m sure we can come to an agreement, just don’t hesitate to hit me up! I mostly love hardware hacking and projects concerning dumb workarounds, because I can more often than not transform that system into a robust, production-ready solution, just point me towards the system and watch the magic occur! I have designed many dev boards for rpi 3 and 4 compute modules, so evidently electrical engineering is something I excel at aswell. Especially IoT and embedded systems, and my projects do speak on my behalf. I’ve helped port openwrt to many unsupported systems, including modifying original firmware, modifying bootloader, patching drivers, etc I’ve also helped migrate an ERP system off the cloud to local hosting hardware while maintaining reliability and uptime. I have joined numerous championships, scoring second twice consecutively in WRO, locally and worldwide. Contribute to gadgetbridge huawei ble link v1 protocol reverse engineering. Also added support for storage manipulation. Enabled nfc functionality, but development stopped before fully understanding the payment process protocol. Basically the Swiss army knife of computer and through leisure before profession, but the best trademan you could hire is one who enjoys his work. If I applied, this means I’m interested, and therefore currently free, so please don’t hesitate to reply anytime, I’m almost always available.

Hey, I’m James. I’ve been a self‑employed business network and server admin for 25+ years, building and supporting critical infrastructure for SMBs and enterprises across the country. I work daily with Linux and Windows environments, VMware and Proxmox clusters, and complex networks that simply cannot go down. Many of my core clients have trusted me with their systems for over 20 years, because I focus on rock‑solid uptime, clear communication, and long‑term relationships—not quick fixes. I specialize in infrastructure that has to “just work”: virtualization, storage, networking, security, and web hosting. Recent work includes fully automated multi‑node VMware + vSAN builds using IPMI, PowerShell, and Python; high‑availability WordPress platforms with 50,000+ active members and 99.999% uptime; and deep network redesigns with Unifi, VLAN cleanup, and clear documentation your internal IT team can actually use. At the enterprise level, I’ve redesigned infrastructure for a 6‑billion‑dollar publicly traded company, implementing redundant firewalls, VMware hosts, dual fiber to AWS with VPN failover, and power redundancy—while reducing monthly management costs by over 25,000 and consolidating 20+ servers to 8. I’ve also delivered CMMC v2 cybersecurity implementations for government contractors, combining policy, technical controls, and staff training into a practical, auditable program. ​ If you’re looking for top‑tier help (not the cheapest bid) with cloud infrastructure, virtualization (VMware/Proxmox), network security, database and web hosting, or compliance‑driven environments, let’s talk. Send a brief overview of your current setup, pain points, and goals, and I’ll come back with a clear, no‑nonsense plan to stabilize, simplify, and scale your infrastructure. When you hire me, here’s what you can expect: 1. Click the “Invite” button to share your job and a brief overview of your environment. 2. Once we’re matched on Upwork, we’ll jump on a call (Zoom or phone) to walk through your current setup and objectives. 3. I’ll ask targeted questions to clarify requirements, risks, and success criteria so we’re aligned on exactly what “done” looks like. 4. I’ll send you a high‑level written plan outlining the approach, milestones, and estimated hours or budget. 5. When we agree on the plan and timeline, I’ll execute, keep you updated as we go, and document everything so your team isn’t left in the dark. If this sounds like the level of help you’re looking for, click “Invite” and let’s get your infrastructure stable, secure, and easy to manage.

I help telecom providers and ITSPs build and scale carrier-grade, multi-tenant VoIP platforms using robust open-source technology. If you’re launching a new service, upgrading infrastructure, or automating operations, I bring the technical leadership and hands-on expertise to get you there—fast. I design and deploy secure, resilient SIP infrastructures that are fully API-driven, scalable, and aligned with business requirements. My work spans everything from PBX and SBC deployment, to real-time billing integration, to zero-touch provisioning and WebRTC enablement. What I Deliver: • Multi-tenant VoIP systems built for performance, scale, and security • End-to-end SIP routing architecture, including NAT traversal and media proxying • Automated provisioning for users, devices, trunks, and call routing • Real-time billing integration, with support for prepaid/postpaid models • API-ready platforms with structured documentation and admin workflows • Production-grade deployments, not test-lab experiments Clients value my ability to move quickly from design to deployment while keeping systems maintainable and fully documented. I’m deeply familiar with regulatory considerations, call quality standards, and building systems with the “always-on” mindset of telecom. Let’s work together to turn your VoIP vision into a stable, scalable, and fully operational platform that supports your growth and your customers.

A highly trained technical individual who has knowledge in security, infrastructure and all layers of the OSI; is able to handle clients and provide them substantial support needed; has excellent communication skills; can lead technical team in field works.Tracked and routed problems and submitted instant resolutions at the shortest time possible. Asterisk/Freepbx/Elastix/SwitchVox VOIP Server deployment and configuration in Linux. Asterisk/Freepbx/Elastix/SwitchVox deployment and Support in VOIP Provider Setup Asterisk/Freepbx/Elastix/SwitchVox CallCenter Solutions Asterisk/Freepbx/Elastix Cloud (AWS and Digital Ocean) based installation, Configuration and troubleshooting. Asterisk/Freepbx/Elastix Cloud (AWS and Digital Ocean) based ongoing Support Asterisk/Freepbx/Elastix/SwitchVox Outbound, Inbound routes SIP Carriers routing Asterisk/Freepbx/Elastix/SwitchVox IVR, Voice Mailbox Asterisk/Freepbx/Elastix/SwitchVox SIP/PRI settings Asterisk/Freepbx/Elastix/SwitchVox Call Recording Asterisk Dynamic logins Asterisk Real Time Database Customization of Asterisk based Voicemail service Deployment of different Text to Speech and Speech to text systems Mysql and Asterisk based dynamic IVR using Text to speech engines like Festival, Cepstral and IBM Watson Real time Asterisk deployment Freeswitch/Fusion Pbx Installation and Configuration Freeswitch/Fusion Pbx Sip Profiles Freeswitch/Fusion Pbx Dial plan and Gateways settings Freeswitch/Fusion Pbx Directory users and groups Kamailio Installation, Configuration and Troubleshooting Kamailio Registrat Server Kamailio SIP Proxy Server Kamailio Realtime Configurations Wazo Installation and configuration Wazo complete deployment solutions Wazo and IBM Watson Speech to Text API successfull Implementation Wazo endpoint configuration Wazo server SIP Trunks configuration Wazo server Incoming and outgoing call routing Microsoft Teams Inbound/outbound Calls Microsoft Teams IVR etc Vicidial standalone installation Vicidial Cluster installation Vicidial inbound Campaign Vicidial outbound campaign Vicidial Blended campaigns Vicidial Customizations and integration with Asterisk servers Vicidial Carriers Settings, Campaigns and Leads deployments Vicidial agent and non agent apis Vicidial Support and Troubleshooting Yeaster UC100 setup, configuration and routing. Databases: MySQL and Postgresql Programming Skills: Shell Scripting, Php, Python, JSON, XML and JavaScript Python Django web development Django and Postgresql Django and ,MySQL Django Rest Framework for API Development a).Expert knowledge of Cisco ASA5505,ASA5510,ASA5520, SonicWall NSA 2400, NSA 2600, TZ170, TZ150, TZ300 and TZ400 Configuration and Deployment of ASA(s) at British American Tobacco Company Configuration and Deployment of ASA at International Resource Group Pakistan b).Expert knowledge of Cisco Rotuers and Layer2,Layer3 Switches Experience and good hand on Cisco Routing and Switching c).Expert knowledge of all kinds of VPN solution Implementation of Site to Site VPN between Telenor and CellTrack International DataCenter Implementation of Site to Site VPN between Warid and CellTrack International DataCenter Implementation of Remote Access VPN for British American Tobacco Company Implementation of Remote Access VPN solution for International Resource group Islamabad Installation, Configuration, Monitoring and Troubleshooting of Router(s), Switch(s), Firewall(s) and VPN(s) Specialties: VOIP Solutions FullStack VoIP Solutions AI pipelines with Asterisk Local AI pipelines with VoIP systems N8N workflow integration with VoIP Platforms Linux System Administration Shell Scripting Network Security Routing and Switching Network Design Python and Django Django Rest Framework

I help businesses simplify complex IT challenges by aligning technology with business outcomes. With 15+ years of hands-on infrastructure, cloud, virtualization, Windows Server, and endpoint management experience, I specialize in Microsoft 365, Azure, VMware, cloud migration, infrastructure modernization, and IT operations. 𝗠𝗶𝗰𝗿𝗼𝘀𝗼𝗳𝘁 365/𝗜𝗻𝘁𝘂𝗻𝗲 & 𝗘𝘅𝗰𝗵𝗮𝗻𝗴𝗲 ✅ Administration of Entra ID, Exchange Online, SharePoint, OneDrive, Teams ✅ Domain & DNS: SPF, DKIM, DMARC, MX, AWS SSO, IAM, EC2, S3, Lambda, VPC ✅ (Microsoft Entra ID/SSO, RBAC & PIM, ADFS, Azure SSO, MFA, SAML, OAuth, OpenID, AD, DFS, LDAP, PKI, SSL ✅ Security & Compliance: Defender for Endpoint & O365, DLP, Conditional Access, RBAC, SSPR, Sensitivity Labels, Azure Security Policies ✅ Tenant-to-tenant migrations: BitTitan, CodeTwo, MigrationWiz, SkyKick ✅ Hybrid Deployments: Exchange + Office 365, ADFS, Azure AD/Entra ID Connect ✅ Modern Workplace Management: Intune, Autopilot, Co-management, AVD, Windows 10/11, Windows 365/Cloud PC ✅Exchange → Microsoft 365 (on-prem, hybrid, or legacy Exchange) ✅Microsoft 365 Tenant-to-Tenant (cutover, staged, or cross-geo) ✅Google Workspace (G Suite) → M365 ✅IMAP / POP mailbox migrations to O365 ✅ RMM tools: Intune, Datto RMM, ConnectWise, NinjaOne, ManageEngine ✅ Endpoint management, application deployment & compliance 𝗔𝗰𝘁𝗶𝘃𝗲 𝗗𝗶𝗿𝗲𝗰𝘁𝗼𝗿𝘆 & 𝗪𝗶𝗻𝗱𝗼𝘄𝘀 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 ✅ Windows Server (2000–2025), STD, SBS & Essentials Deployment and Administration ✅ Active Directory (ADDS), DNS, DHCP, GPO, IIS, WSUS, NTFS, DFS, LDAP, PKI, DNS, GPO, DHCP, IIS, WSUS, SSL, Azure Virtual Machines, Azure Storage, Azure Functions, Virtual Networks, Azure WAF, P2S/S2S VPN, File Services Management ✅ Domain Controller (DC) Migration & Active Directory Modernization ✅ FSMO Role Transfer, AD Health Checks & Infrastructure Upgrades ✅ Hybrid Identity with Entra ID (Azure AD), Entra Domain Services & Azure AD Connect ✅ ADFS, Single Sign-On (SSO), Multi-Factor Authentication (MFA) & Identity Management ✅ Remote Desktop Services (RDS), RRAS & Secure VPN Deployment ✅ PPTP, L2TP/IPsec, SSTP & IKEv2 Remote Access Solutions ✅ Hyper-V Virtualization, Live Migration, NLB, CAU & Hyper-V Replica ✅ Windows Server Failover Clustering (WSFC), CSV & High Availability (HA) ✅ Disaster Recovery (DR), Business Continuity Planning (BCP) & DR Testing ✅ Azure Arc, Azure Site Recovery (ASR) & Hybrid Cloud Integration ✅ Windows Admin Center (WAC) & SCVMM Administration Additional experience includes Vmware vSphere, vSAN, Proxmox VE, Veeam backup solutions, Omnissa Horizon VDI and enterprise ITSM platforms including Manage-Engine and Web Help Desk. Why Clients Work With Me: • Strong blend of technical expertise and business strategy, ensuring solutions align with operational goals, budgets, security, and compliance requirements. • Extensive experience in deploying, modernize, troubleshooting complex Vmware, M365, Windows Server, Veeam and Azure environments. • Clear communication, detailed documentation, knowledge transfer, and a client-first approach throughout every engagement. ---------------- Certifications ---------------- ✅ MS - Server Virtualization with Hyper-V and System Center ✅ MCSE - Microsoft Certified Solution Expert ✅ Microsoft Certified Azure Administrator

I help businesses fix email deliverability problems, stabilize sending infrastructure, and resolve the technical issues that push emails into spam, throttling, or failed delivery. I’m Top Rated Plus on Upwork with 100% Job Success and 1,500+ hours worked. Before freelancing, I worked as a Network Security Engineer at Sophos, where I was recognized as a top global performer. That background shows up in how I work: structured diagnosis, clean implementation, and reliable systems. I’m best suited for technical email projects such as: • SPF, DKIM, and DMARC setup and alignment • DNS cleanup, tracking domains, routing, and authentication fixes • SMTP troubleshooting and email server infrastructure • Mailcow, Postfix, Outlook, and Microsoft 365 email issues • Gmail and Microsoft throttling, spam folder issues, and sending reputation problems • Klaviyo and Mailchimp backend setup from a technical and deliverability angle • Email, CRM, and server integrations • Ongoing infrastructure monitoring, hardening, and support I focus on the technical side of email systems — not copywriting or creative campaign management. Clients hire me when the backend is broken, inbox placement is weak, authentication is misconfigured, or email systems need serious technical ownership. Typical engagements I take on: 1. Deliverability audit and remediation plan 2. Email infrastructure setup, repair, or migration 3. Ongoing monitoring and technical ownership If your email setup is unstable, your messages are landing in spam, or your sending infrastructure needs a technical fix, send over your current stack and the issue you are seeing.

Accomplished IT infrastructure and security consultant with expert technical knowledge and extensive experience spanning over 20 years. Core strengths are in research, design, implementation and troubleshooting of IT infrastructure, enterprise applications and security solutions with emphasis on cloud technologies.

Rich experience in AI, Robots, Linux, Embedded system, Network, Wireless, VPN, and Cyber-security. I have worked for Huawei 8yrs+ and twsz 5yrs+. Proficient in R&D, manufacturing, and project management, familiar with Industrial/Consumer ODM&OEM. ⏺Welcome long-term projects in embedded micro-AI system or/and AI-driven robots. Short-term projects can only result in simple & soulless deliverables, while long-term collaboration is what creates instersting and successful products.🈴 🧩Linux Kernel ✅Subsystem: Filesystem, Network, Security, Video(V4L2/DRM), DVFS, KVM ✅Optimization: Security, Performance, Drivers, Malware 🧩Embedded Linux ✅ Frameworks: ESP-IDF, FreeRTOS, Zephyr, OpenWRT, Yocto, QT5, ESP-Brookesia ✅ Drivers: WIFI, LTE, Network, A/D, CAN,BT/BLE, Lora, RFID, USB,PCIe, GNSS ✅ Hardware: ESP32, STM32, GD32, Allwinner, RockChip, MTK, QCA, RealTek, Quectel, Fibocom, Planetary Gearbox, Servo Motor, IMU, LiDAR, Camera, GPU, NPU 🧩Linux Development ✅ System: Ubuntu, Centos, Debian, Raspberry pi, ROS2 ✅ Network: VPN, VLAN, EBTABLES/IPTABLE/NF, XDP, P2P ✅ Container: Qemu, Libvirt, Virtualbox, Docker ✅Programming： ★C/C++/Python/PHP/Typescript/Pandas ★Bash/Makefile/CMake ★MySQL 🧩AI & Robotics ✅ROS2/TensorFlow / Scikit-Learn / OpenCV / YOLO / OpenMV4 ✅AI robotic arm / Intelligent voice&video module ✅Servo / Piezoelectric Sensor / BMS ✅PID / KF(EKF, UKF) /Smith Predictor /Smith Chart ✅VSCode+Cline 🎯Product Development ★ 10+ Years: ✅Software and hardware development, system analysis, embedded systems, network security, wireless communication, consumer / industrial / automotive products. ✅IoT & Wearable: STM32, ESP32, GD32, nRF52, GOODIX, N32(RFID), etc. ✅Cutting-Edge & iTV: Raspberry Pi, MILK-V, RedPitaya(open hardware), and NXP, MicroChip, MTK, Amlogic(S905 series), Allwinner(T5x7 series), RockChip(RK35xx series); and X86( J1900, I5). ✅Switch & Router: Qualcomm/MTK(Wi-Fi/5G Router), RealTek(Switch), and Broadcom(Wi-Fi Router), X86(Softswitch/Router), etc. ✅Proficient in LiFePO4 and MAX173xx. ✅Proficient in hardware interfaces such as A/D, I2C, ISP, RS232/RS485, CAN, USB, PCIE; Familiar with circuits, heat distribution, EMC/EMI. ✅Proficient in MAC(VLAN), Bluetooth/BLE, Wi-Fi, LTE/5G(Quectel, Fibocom), RFID(NFC) , GPS ✅Proficient in TCP/IP(IPv4&IPv6), MQTT, MATTER, VPN, HTTP/HTTPS, DDS, TF2 ✅Proficient in Linux, RTOS, C/C++, Python, and Rust; Familiar with PHP, LVGL, Flutter, JS and MySQL ✅Product Lifecycle Management(PLM) workflows, from concept to mass production. 🎯Project Management ★ 10+ Years: ✅Continuously optimize the value of Cost, Time, and Quality ✅Budget tracking, PDT establishment & maintenance. ✅Cross-function team communication ✅WBS revision, schedule supervision, quality control and risk prevention. ✅ODM&OEM workflows optimization 🎯Network Security ★ 10+ Years: ✅Linux: CentOS / Ubuntu / Debian / Armbian ✅VPN: OpenVPN / Socks5(V2RAY) / WireGuard / SoftEther / IPSec ✅Network: Switch / Router / Firewall / CPE(Wi-Fi/LTE/5G) / OPNsense ✅Security: Zabbix / Nezha / ELK / Shodan / FoFa / MalWare / Reverse Engineering / IDA / KALI 🎯Manufacturing Management ★ 10+ Years: ✅20+ OEM / ODM factories, verified and reliable ✅BOM, SOP optimization, quality control, issues management. 🎯Other ⭐Open-Source: OpenWiFi / COFDM / OpenWRT / OpenHAB ⭐SDR: Xilinx&AD9363 (Vivado/Modelsim) ⭐Niche: Reverse Engineering on Network & CAN / Wi-Fi defense / File system encryption /Assistant Robot 📌Proficient in NB-IoT/4G/5G modules of Quectel, Fibocom,Think-Will and EBYTE, proficient in GL.iNet, BL-Link, ZBT's Wi-Fi router and travel router.🔸 🔸 🔸