Hire the Best Systems Developers

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Muhammad H.

Karachi, Pakistan

$20/hr
4.5
104 jobs

I am a highly experienced IT professional with 16+ years of hands-on experience in Systems Administration, Cloud Infrastructure, DevOps, Networking, Security, and Software Development. Over the last few years, I have expanded my expertise into Artificial Intelligence, AI Agents, Large Language Models (LLMs), Automation, and Chatbot Development, helping businesses automate workflows and improve productivity through intelligent solutions. I specialize in building and deploying AI Agents, AI Chatbots, RAG Systems, Voice AI Solutions, Business Automation Workflows, and Local LLM Environments using modern AI technologies. AI & AI Automation and Deployment AI Agent AI Chatbot Ollama & Administration Local LLM Setup and Configuration Llama 3, DeepSeek, Qwen and Gemma Integration RAG (Retrieval-Augmented Generation) Systems Knowledge Base AI Assistants Voice AI Solutions AI-Powered Customer Support Systems Prompt Engineering AI Workflow Design AI Business Process Automation AI API Integration OpenAI Integration WhatsApp AI Chatbots MCP (Model Context Protocol) n8n AI Automation AI-Powered Web Applications Software Development C# ASP.NET .NET Core REST API Web Application Desktop Application API Integration Google Play API Integration JSON & XML Processing JavaScript HTML PHP Python YAML office 365 administration Azure DevOps and CI/CD pipeline Windows Server Administration Windows Server 2008 – 2022 Active Directory Group Policy Management LDAP DHCP DNS RADIUS Windows Security Hardening Hyper-V Virtualization SCCM RDP Configuration Server Migration Performance Optimization System Installation & Upgrade Linux Server Administration CentOS 6, 7, and 9 Ubuntu 10.04 – 24.04 Debian 8, 9, 10, 11, and 12 Linux Security Hardening LDAP Configuration Shell Scripting Server Optimization Performance Tuning Service Deployment and Management Cloud Computing Microsoft Azure Amazon Web Services (AWS) AWS EC2, S3, Lambda, Route 53, RDS & AWS Serverless Architecture Google Cloud Platform (GCP) Cloud Infrastructure Design Cloud Migration Cloud Security Web Servers Apache Server (Linux & Windows) Apache Tomcat (Linux & Windows) Nginx Server (Linux & Windows) IIS (Internet Information Services) Node.js Hosting Environment PHP Hosting Environment XAMPP WAMP LAMP Stack LEMP Stack SSL Installation and Configuration Website Migration Performance Optimization Reverse Proxy & Load Balancing Nginx Reverse Proxy Apache Reverse Proxy IIS Reverse Proxy Nginx Load Balancing Apache Load Balancing HAProxy Squid Proxy 3Proxy Varnish Cache Docker-Based Reverse Proxy Solutions V2ray Xray Email Servers & Email Security Microsoft Exchange Server 2010 & 2019 Zimbra Postfix Exim iRedMail Kerio Connect Zoho Mail hMailServer Secure Email Infrastructure End-to-End Encryption (E2EE) OpenPGP / PGP S/MIME Email Security & Protection Database Administration Microsoft SQL Server 2012-2025 PostgreSQL MySQL 5.7 – 8.0 MariaDB MongoDB SQLite Database Optimization Backup & Recovery Performance Tuning Backup & Disaster Recovery Veeam Bacula Backup Syncthing Rsync Hadoop Big Data Synology NAS FreeNAS Disaster Recovery Planning Business Continuity Solutions Data Protection Strategies DevOps & Virtualization Docker Docker Compose VMware ESXi, vCenter & Workstation vMotion & Storage vMotion Hyper-V KVM Virtualization XEN Server Infrastructure Deployment Environment Automation Networking MikroTik RouterOS LAN & WAN Networks VLAN Configuration VPN Solutions Routing & Switching Network Monitoring Network Troubleshooting Routers & Wireless Solutions MikroTik RouterOS OpenWRT DD-WRT UniFi Ruijie Networks EnGenius EzMaster Wireless Network Deployment Mesh Network Solutions Firewall pfSense Fortinet FortiGate Sophos XG SonicWall Kerio Control IPFire IPCop Security Hardening Access Control Policies Network Security Solutions Hostaing panel cPanel & WHM Plesk Webmin Virtualmin VestaCP Sentora zPanel Management Systems WordPress Magento OpenCart Chat & Collaboration Servers Rocket.Chat OpenFire Asterisk VoIP Server FreePBX FTP Servers Monitoring & Analytics ELK Stack Log Analysis Infrastructure Monitoring Performance Monitoring Captive Portal Solutions FreeRadius Radius Server CoovaChilli Chillispot OpenNDS WifiDog Captive Portal Solutions Guest WiFi Authentication Systems Why Work With Me? 16+ Years of Professional IT Experience AI Agent & LLM Development Expertise Strong Problem-Solving Skills Enterprise Infrastructure Experience Secure & Scalable Solutions Fast Communication & Reliable Support Long-Term Client Relationships Focus on Quality, Performance, and Security I help businesses deploy secure infrastructure, automate operations, build AI-powered solutions, and develop scalable applications that deliver real business value. Whether you need an AI Agent, Ollama deployment, n8n automation, cloud infrastructure, server administration, DevOps support, or custom software development, I am ready to help bring your project to success.

  • Microsoft Azure
  • Google Cloud Platform
  • Docker Compose
  • Node.js
  • Django
  • Single Sign-On
  • React
  • Windows Administration
  • Kubernetes
  • Linux System Administration
  • AWS Systems Manager
  • Domain Migration
  • PHP
  • Email Deliverability
  • Encryption
Moises P.

Buenos Aires, Argentina

$52/hr
5.0
7 jobs

Most game projects don't fail because of missing features. They fail because the systems underneath weren't built to scale. I build the systems that hold. I'm Technical Director at Override Systems. I've led the architecture on shipped PC, console, and mobile titles — not just features, but the data flow, authority models, and structural decisions that determine whether a project survives production. What I Do Gameplay & Combat: combat flow, player mechanics, ability systems, interaction models Data-Oriented Architecture: custom ECS, UE5 Mass Entity, performance-critical pipelines Multiplayer & Networking: authoritative replication, GAS, Steam/Edgegap dedicated server backend AI Systems: behavior trees, decision logic, pathfinding, simulation Tooling: editor tooling, configuration systems, designer-facing pipelines Shipped Work Lead & Architect — Grow Empire: Rome (Unity, mobile, 10M+ players) Lead & Architect — Toxic Crusaders (Unity, PC/Console) Lead & Architect — Mythic Legions (Unity, PC) Built Clockwork — custom archetype-based ECS in C# for high-performance simulation How I Work Architecture first. I ask about data flow and authority before writing a line of code. I lead small focused teams, write the hard systems myself, and flag problems early. I don't hide complexity behind magic frameworks. Also available for backend/distributed systems contracts — Go, C#/.NET, microservices, cloud architecture.

  • C++
  • C#
  • Artificial Intelligence
  • Game Development
  • AWS Systems Manager
  • Game Design
  • Unity
  • Mobile Game
  • Unreal Engine
Seifeddine S.

Kelibia, Tunisia

$70/hr
5.0
76 jobs

Your systems don't talk to each other. I build the integration layer that connects them. CRM, ERP, billing, ops. Fixed scope, from $6,000. Not open-ended hourly. Right now someone on your team is retyping data between two tools every day. Or a handoff fails silently and nobody notices for a week. That is the work I remove. ▸ ACCOMPLISHED WORK Built the platform running a German insurance claims operation. Customer app, internal portal, AI that reads every claim document. It handles their entire workflow now. Built the operations portal for a US flight school. Subscription and billing on Stripe, customer accounts, user management, 129 endpoints. In production since March. Built the B2B purchasing platform for a UK wholesale company. Portal, payments, order management. Their ordering runs through it. Built the inspection platform for an automotive damage business. Mobile capture, cloud sync, admin dashboard for the expert network. That is what I do. Systems that talk to each other, and the automation that sits on top. ▸ MASTERED TECH React, Next.js, NestJS, React Native, PostgreSQL, Supabase, n8n, OpenAI APIs, Stripe, REST and webhook integrations. ▸ HOW I WORK Written spec before anything is built. Fixed scope, dated milestones, documented handover. You get a start date and an end date up front. I don't do open-ended hourly and I don't hand off unfinished work. I build, deploy, and support. ▸ TRACK RECORD 100% Job Success Score. Top Rated Plus. 68 contracts, 2,276 hours, every client relationship over 90 days. $70/hr, or fixed scope from $6,000. If your systems don't talk and it is costing you a person's time every week, message me.

  • Systems Development
  • AI App Development
  • API Integration
  • CRM Software
  • ERP Software
  • Enterprise Software
  • Business Process Automation
  • Solution Architecture
  • Automation
  • Application Integration
  • Data Integration
  • Stripe
  • n8n
  • Node.js
  • NestJS
  • Next.js
  • React
  • TypeScript
  • Supabase
  • DevOps
Muhammad Naeem T.

Lahore, Pakistan

$50/hr
4.8
63 jobs

If you're looking for a fast, experienced, reliable, and practical developer to build your project, you're in the right place. I specialize in completing challenging projects and designing highly customized, secure software architectures from the ground up. I'm Expert in 30+ Programming Languages and hundreds of Technologies in my 15+ years of experience and have an impressive more than 80% client rehire rate. Impressive Success Stories: A browser project abandoned after $15,000 and 3 months. I delivered it in 3 weeks. Another left incomplete after $30,000 and 6 months. I started from 0 and shipped the same in one week. A mobile app stuck for 2 months. Fixed in 4 days. which was 20-25 times faster then previous developers and companies. Are you ready to get impressed as well? I focus on delivering solutions significantly faster than most developers while maintaining high standards of quality, security, and long-term maintainability, as well as providing after-sales support and making sure my clients have all source code, logins and some documentation, so if needed they can modify it easily themselves, and my work on deep browser modifications, anti-fingerprint, LLM and Web3 can speak mountains for itself. My Technical Track Record: Anonymous Anti-Detect Browser: Engineered specialized Chromium browsers from the source code, specifically hardened to bypass advanced anti-bot and device fingerprinting systems including the most advanced security and anti-bot systems. DemoStory Browser: Developed sophisticated session separation architecture to ensure 100% isolated environments, bypassing hardware-level restrictions. Total Security Browser: The Giant company also trusted me with development of their security browser. Privacy & Web3 Customization: Developed the Max Browser (complete block-out of big tech monitoring and data brokers) and in GTX and several browsers integrated IPFS protocols with custom URL schemes (gtx://, orbiti://) for decentralized ecosystems. I have developed 30+ Chromium browsers, including: Total Security Browser, Symphony Browser, Anonymous anti-fingerprint browser, Web3 Browser, Hassane Fake Camera Browser with bypass-anti-bot technology (privately distributed) Epic Browser Kahf Browser CEF transparency (company's internal) Max browser GTX browser Egon browser Ajna Browser BrowseWeb3 / BW3 Orbiti browser Minego browser Demostory browser True browser Sonmit browser Asil browser Halalz browser (for muslims) XFII browser Browser for company's internal support agents A custom hardware browser for a company's custom made tablets with limits on what users can do on it & OS Development including: Eye Tracking for Android Smart Glasses Linux OS patches Android OS patch & Mobile Apps including: AccuRange cross platform mobile app for golfers, AccuPin mobile app for golf club owners and managers. & AI Development contribution including Mira, the SaaS platform for deploying custom AI bots FlowX, AI Agents in Weeks with enterprise observability. Campaign AI, replaces 6 hours of manual SEO research AI MDR, cybersecurity automation platform with intelligent triggers and real-time AI threat response. and also 300+ chrome extensions and hundreds of websites, desktop & mobile apps, scripts, games. My 3-Step Process To ensure your project is successful, I follow a strict process: Free Architecture Audit: I map out your requirements and provide a free technical plan outlining the fastest, perfect and most effective path to delivery. Development: Once a contract begins or sometimes during the planning phase, I work directly with source code. Unlike other developers, I can implement modifications at the perfect place. Live Demonstration: You See Your Software/App/Browser whenever you want or at final delivery, you receive all source code, logins, API keys, and some documentation before we close the project and give each other 5 stars. The Proof & Client Feedback: With an impressive 80% rehire rate and over $180,000 in platform earnings. I regularly take on projects that other developers consider time taking, expensive, difficult or impractical, and bypass those roadblocks other developers face, which has resulted in many long-term client relationships and repeat engagements. Let's get started on your project and build it faster, more securely, and with greater flexibility than most developers and agencies do. 🌐. Chromium & Brave based Browser Development, 💻 Desktop Development, 📱 Mobile Development, 🚨 Security Systems Development, Patches, Bypasses, 🧠 AI and LLM Development, 🌐 Web Development, ⚙️ OS & System Software Development

  • React Native
  • Chromium
  • C#
  • C++
  • Python
  • Google Chrome Extension
  • Android
  • Operating Systems Development
  • Chrome OS
  • Computer Operating System
  • Mobile Operating System
  • Flutter
  • Front-End Development
  • Full-Stack Development
  • Mobile App Development
Daniel R.

Melbourne, Australia

$60/hr
5.0
8 jobs

I'm a Shopify, BigCommerce, Klaviyo and ecommerce solution architect with 15+ years delivering platform migrations, integration architecture, and conversion optimisation for Australian retail, DTC and B2B brands. I specialise in complex ecommerce builds where strategy matters as much as execution: Shopify Plus migrations, B2B wholesale setups, subscription models, ERP and 3PL integrations, and loyalty program architecture that protects margin while driving repeat purchases. Notable projects include Kitchen Warehouse's migration from Netsuite to commercetools (50k+ SKUs), Splash Alley's BigCommerce B2B build with multi-tier pricing, and multiple Shopify migrations where clean product architecture and integration reliability were critical to success. I work as both strategist and implementer, building integrations using Make .com, Celigo, and n8n, while partnering with specialist developers when front-end or design work is needed. My focus is on delivering scalable, maintainable solutions that work in the long term, not quick fixes that create technical debt. Certified in Boomi iPaaS, Celigo, Prince2, and Google Data Analytics. Based in Melbourne, working with clients across Australia and internationally.

  • Ecommerce
  • Shopify
  • BigCommerce
  • WooCommerce
  • Web Analytics
  • CRM Software
  • ERP Software
  • Oracle NetSuite
  • Website Integration
  • Point of Sale & Payment Systems
  • Klaviyo
  • Make.com
  • Loyalty Marketing
  • Conversion Rate Optimization
  • Email Marketing
Samarth N.

Delhi, India

$50/hr
5.0
3 jobs

I build production-ready AI systems that ship and stick, not prototypes. Most recently: sole engineer behind a government AI platform for large-scale media monitoring and decision support. Built from scratch in 8 months, deployed in production, used by senior leadership for real-time insights across an entire country. Previously built GenAI tooling at Fujitsu and ML systems for large-scale resource allocation. What I build: AI automation that cuts manual work and operational costs LLM-powered monitoring, classification, and insight systems End-to-end products: Next.js + Python/FastAPI, built to scale Reliable architectures: Redis, BullMQ, Postgres, AWS What working with me looks like: Fast turnaround, US time overlap when needed Production-quality code, built to scale, not break Full ownership: idea → deployed system I care about outcomes, not just shipping features If you need AI that actually works in the real world, let's talk.

  • Artificial Intelligence
  • Web Development
  • Product Development
  • Analytics
  • Data Analytics
  • Java
  • Python
  • MERN Stack

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Don't just take our word for it

What does a systems developer do?

A systems developer builds and maintains the core software infrastructure that allows computer networks and specialized utility programs to function. This role focuses on designing system specifications, writing code for operating environments, and modifying existing software to meet performance standards. You translate user needs into technical solutions by analyzing data and determining the feasibility of designs within specific time and cost constraints.

  • You design and develop software systems by defining clear interfaces and performance requirements that align with organizational goals. This work involves creating new applications or enhancing current capabilities to support complex network operations and specialized utility functions.
  • You establish testing and validation procedures to verify that software operates correctly before deployment. This includes writing automated tests, identifying bugs, and modifying code to correct errors or adapt programs to new hardware configurations.
  • You plan and coordinate the installation of new systems or modifications to existing infrastructure while monitoring performance metrics. You generate documentation and reports that detail project specifications, activity logs, and status updates to keep stakeholders informed of progress and technical changes.

How to hire a systems developer on Upwork

Step 1: Post a job

Define your infrastructure needs clearly to attract qualified candidates who can build and maintain complex software systems. Use the Job Post Generator powered by Uma™, Upwork's Mindful AI to draft a precise description in seconds. Describe your core requirements in a few sentences, and Uma constructs a structured post tailored to this role. You can write a new post from scratch, update a saved draft, or reuse an existing template to save time.

  • Specify the exact operating systems, programming languages, and network protocols the developer must master to integrate with your current stack.
  • List required deliverables such as modified utility programs, performance standards documentation, or validation procedures for new hardware adaptations.
  • Include expected hourly rates between $16 and $61 per hour based on the complexity of system modifications and testing responsibilities.

Step 2: Evaluate candidates

Review portfolios for evidence of full lifecycle development, from analyzing user needs to deploying installed system modifications. Uma runs instant video interviews and builds shortlists with side-by-side comparisons to help you identify top performers quickly. Look for concrete examples of how candidates resolved feasibility issues within strict time and cost constraints.

  • Verify experience with version control tools like Git and continuous integration platforms such as Jenkins CI to ensure smooth collaboration.
  • Check for documented testing routines using Selenium or similar frameworks that prove the candidate validates code before deployment.
  • Assess their ability to produce clear technical reports and specifications using project management tools like Jira or Atlassian Confluence.

Step 3: Interview your top choices

Discuss specific technical challenges related to system performance standards and software error correction during your conversations. Schedule and conduct these interviews directly within Upwork Messages, which generates an immediate transcript and summary after each session. Focus on their approach to determining design feasibility and adapting software to new hardware environments.

  • Ask how they analyze data to plan installations and monitor system performance for conformance with established metrics.
  • Request examples of how they modified existing software to correct errors or improve efficiency without disrupting ongoing operations.
  • Evaluate their communication style when consulting with other departments on technical issues or status proposals.

Step 4: Agree on scope and begin work

Define clear milestones for software solutions, testing procedures, and documentation deliverables before starting the engagement. Use Upwork Messages and the contract workroom for all communication and project management tasks to keep records organized. Identity verification, Hourly Payment Protection, hourly tracking, and project funds secure the working relationship for both parties.

  • Set specific deadlines for developing software systems and defining interfaces that meet your performance requirements.
  • Establish a routine for submitting validation procedures and progress reports to track alignment with project specifications.
  • Confirm the process for installing new systems or modifications and monitoring their operation against agreed-upon standards.

Upwork is not affiliated with and does not sponsor or endorse any of the tools or services discussed in this article. These tools and services are provided only as potential options, and each reader and company should take the time needed to adequately analyze and determine the tools or services that would best fit their specific needs and situation.

The rates and information provided in this article are based on current data and industry sources available at the time of publication. Freelance rates can vary depending on factors such as experience, location, project scope, and market conditions. Readers are encouraged to conduct their own research to confirm current rates and trends, as this information may change over time.

How much does hiring a systems developer cost?

$500-$2,500 per project is a typical range for focused systems developer work. Final pricing depends on scope, technical complexity, required integrations, source-material quality, revision needs, and the freelancer's experience level.

System requirements analysis

$500-$1,200/project

Entry-level to mid-level
  • Assessment of design viability within constraints
  • Documented user needs and software requirements
  • Proposed timeline and resource allocation strategy

Software testing procedures

$1,200-$2,500/project

Mid-level
  • Automated validation routines using Selenium
  • Detailed logs of errors and correction steps
  • Procedures for verifying system performance standards

System modification and repair

$2,500-$4,500/project

Mid-level to senior-level
  • Modified software to correct errors or adapt hardware
  • Updated standards for evaluating system operation
  • Documentation of activities and project progress

New system installation

$4,500-$7,000/project

Senior-level
  • Coordinated schedule for deploying new systems
  • Installed and tuned system components for conformance
  • Guides covering specifications and operational status

Custom software development

$7,000-$12,000/project

Expert-level
  • Designed interfaces and performance requirements
  • Built software solutions with version control via Git
  • Compiled release artifacts and integration configurations

Frequently asked questions

Is hiring a systems developer worth it?

For most businesses, yes: hiring a systems developer is worthwhile. These professionals build custom software solutions that align with your specific operational needs rather than forcing you to adapt to off-the-shelf products. They also modify existing code to fix errors or improve performance, which extends the life of your current technology investments.

How do I evaluate systems developer candidates?

Evaluate candidates by reviewing their approach to testing and validation procedures, as this reveals their commitment to system stability. Look for examples where they defined performance standards before writing code, such as creating documentation that outlines specific metrics for system conformance prior to installation.

What tools do systems developers use?

Systems developers often use Git for file versioning and Jenkins CI for enterprise integration. They may also rely on Jira for content workflow management and Selenium for program testing.

What deliverables can I expect from a systems developer?

You will receive new or enhanced software solutions along with updated capabilities tailored to your requirements. The developer also submits testing procedures, project status reports, and documentation covering system specifications.