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Top freelance System design developers available to hire

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Freelance System design Developer - Olajide Olanrewaju
Freelance System design Developer5.0 (379 reviews)

I am a **Multi-talented** professional adept in **Full Stack Web Development**, **Web Security Research**, and **Robotics Engineering**. As a dedicated Web Security Researcher and ethical hacker, I uncover vulnerabilities and mitigate security risks, bridging the gap between development and cybersecurity. Additionally, as a Robotics Engineer, I design and build sophisticated robotic systems, applying my deep understanding of mechanics, electronics, and programming. Passionate about crafting clean, scalable code and innovative robotics solutions, I contribute to projects that prioritize both robust development, cybersecurity practices, and cutting-edge robotic technology.

Freelance System design Developer - Harshit Goyal
Freelance System design Developer5.0 (2 reviews)

I am working in the industry for more than 6 years now + 1 year internship, I have guided so many freshers and new joiners, also I am already a mentor at one of the top Coding Academy of India

Freelance System design Developer - Kshitiz
Freelance System design Developer5.0 (10 reviews)

A seasoned software developer who worked with Amazon and has 6+ years of experience developing applications that scale efficiently and remain maintainable in the larger frame of the product lifecycle. Have built robust applications which have scaled from 500 to 21+ million users serving one of the biggest supply chains in the world. Have also delivered on projects of all sorts in Java and Python with companies like Samsung and Paytm as well as freelancing with multiple Silicon Valley startups. Also have mentored a lot of folks at all ages and levels in Data structures, Algorithms, Web development, System design, and programming languages like Python, Java, JS, Golang, etc. Come say Hi👋 First session is always on the house :) See if my teaching style really makes a difference in your journey or not

Freelance System design Developer - Umair Jameel
Freelance System design Developer5.0 (18 reviews)

● AI Powered development using Javascript and its frameworks/libraries like Angular, React, Next.js, Express, Node, Express, mongodb, mongoose etc. ● AI agents, prompt engineering, RAG, MCP servers, vibe coding. ● Full stack development in next.js including frontend, backend and databases. ● Architecture projects from scratch as well as building new features in existing projects. ● Debug and fix errors in existing projects. ● Database architecture using mongodb, postgres, ORMs like prisma and drizzle. ● Implement the best practices of code structure, logic building and making code efficient. ● Follow pure Object Oriented Programming and Data Structures for solving problems. ● REST API development using node and its frameworks (mainly express). ● Know best practices of writing test cases (it includes unit testing and automation testing). ● Decision making in choosing programming languages, frameworks and libraries for a particular project. ● Good communication skills and understanding client requirements. ● Do research and development to stay up to date with new technologies and always keen to adopt better approaches in solving any kind of problem. ● Experience in CI/CD, docker, github actions etc. ● Teaching experience for over 5 years now. These are some projects I have worked on: https://learnwith.flashclass.io/ https://www.getconch.ai/ https://eahousing.es/ https://www.blackbox.ai/ https://unation.com/

Freelance System design Developer - Qaiser Mehmood
Freelance System design Developer5.0 (7 reviews)

I define the architecture. For 21 years, I've been the person CTOs and lead developers call when systems fail under load, migrations are at risk or AI integration needs to work right the first time. With expertise in .NET, Python, Blazor, ASP.NET Core, SQL and agentic AI architecture (LLMs, reasoning engines, Semantic Kernel, LangGraph, tool-calling agents), I design systems where performance, reliability, and intelligent automation aren't optional—they're the baseline. I deliver AI in production, not prototypes. I’ve architected and deployed AI-powered systems across financial platforms, education and exam automation, and real estate market intelligence, including enterprise-grade solutions for organizations such as The New York Times, Project Management Institute (PMI), Walmart, Merit Wealth, Namfus and BlueberryCMS. --- **Here's where I'm most useful to you:** - **The AI Integration Trap** — You've been asked to add AI to your existing .NET system but don't know whether to use *Semantic Kernel*, raw OpenAI APIs, or a Python sidecar. I've made that decision dozens of times. I'll make it faster and safer for you. - **The Blazor Bottleneck** — Your Blazor app is slow, state management is tangled, and you're unsure if you chose *Server or WASM* incorrectly. I can diagnose what went wrong and map a clean path forward — often in a single session. - **The Legacy Modernization Cliff** — You have a 10-year-old .NET system that needs AI or modern tooling but wasn't designed for it. I specialize in *incremental refactoring paths* that don't require a full rewrite and don't break what's already working. --- **What I Do Best:** - **Software Architecture & System Design** — scalable, maintainable systems from greenfield to enterprise - **AI Agent Development** — production-grade agents with Semantic Kernel, LangGraph & AutoGen — *not demos* - **Blazor & ASP.NET Core** — Server, WASM, hybrid — full-cycle development and performance tuning - **Python & AI Automation** — RAG pipelines, workflow automation, voice AI, LLM integrations, chatbots - **Legacy .NET Modernization** — refactoring strategy, migration paths, incremental upgrades - **Architecture Audits** — identifying structural risk before it becomes a production incident, not after - **Debugging Complex Systems** — when the stack trace doesn't tell the whole story **If any of this sounds like your current situation — DM me. I respond to every message.**

Freelance System design Developer - Mike Schinkel
Freelance System design Developer5.0 (33 reviews)

I am **US-based** and have **30+ years experience** during which I have been a software developer, a programming trainer, a marketer and an entrepreneur. My current focus is in **long term tutoring** students in **programming**, **CI/CD DevOps**, and/or how to use AI like **Claude Code** or Codex for programming. Specifically: 1. I specialize in **Go** and **Bash** programming 2. I love **API**s and can teach you how to call them with command line Bash tools 3. I can teach you how to write API **servers** in Go, and also how to call APIs in Go. 4. I have 25+ years in **SQL** and can teach SQLite, MySQL, or Postgres 5. I can teach you to configure **macOS** and **Linux** for programming 6. I can teach **CI/CD** with **GitHub Actions**, Jenkins, GitLab, or others 7. I can teach using **Docker** containers and/or how to build them 8. I can how to write **Kubernetes** controllers and operators in Go 9. I can teach you how to work with **Digital Ocean** or basics in **AWS**. I can also teach you many other things. While I don't use Windows daily, I have used it in the past and am familiar with PowerShell and Windows System for Linux so I can help with those if need be. ALSO, I am great at learning on the fly so if you are interested in me helping you learn something I have not listed I will consider giving a discount for topics that allow me to learn new things while teaching, especially related to AWS.

Freelance System design Developer - VIVEK SINGH
Freelance System design Developer5.0 (13 reviews)

Polyglot programmer with experience in developing and delivering end-to-end software which includes development and deployment. **Agile Software Engineer and Certified Kubernetes Application Developer**. My mantra is to ```Learn as much as you can``` Things in which I can help you out with: - **System design** - **Best coding practices** - **Micro-services Architecture** - **Some DevOps magic** - **Kubernetes Application Developer** - **Job Preparation** - **Career progression** - **Study Assignments** I will help you out in integrating any technology easier and faster. I have this belief to make the code as simple as possible which can be easily understandable by many.

Freelance System design Developer - Lenka Pitonakova, PhD
Freelance System design Developer5.0 (6 reviews)

**I am a freelance software developer, a clinical counsellor and a mentor in one.** **As a software developer,** I do contract work through my Vancouver-based company Qubiq Interactive ([https://www.qubiqinteractive.ca](https://www.qubiqinteractive.ca/)). My main focus in on custom-built applications that require a unique engineering approach, although I have extensive experience with working on more traditional consumer apps and websites as well. I am especially passionate about agent-based modeling and games development. **As a tech counsellor** at my private practice Treerock Therapy ([https://www.treerocktherapy.ca](https://www.treerocktherapy.ca/)), I provide career counselling to individuals and team mental health consulting to tech companies. My mission is to facilitate transformation of burnout, anxiety and depression into self-actualization in my clients. I started my career in the engineering industry in 2009 and received a PhD in Simulation of Complex Systems from the University of Southampton, United Kingdom in 2017. I have developed autonomous robot simulations, distributed data processing systems, games and websites. I trained and mentored junior programmers, led development teams and maintained strong relationships with clients. I taught software development at higher education institutions in Europe and in Canada.

Freelance System design Developer - Dan DiGangi
Freelance System design Developer

20 year software engineer, 10 years engineering manager. Extensive experience in Javascript/React for coding mentorship. Mentoring for 15 years a mix of technical, leadership, and professional skills. I do this for fun on the side so I don't charge much. https://www.dandigangi.com https://linkedin.com/in/dandigangi https://x.com/dandigangi

Freelance System design Developer - Muhammad Alam
Freelance System design Developer

I am an experienced software developer and technical lead skilled in mentoring, software requirements analysis and systems design, with special focus and experience in web applications development. I have designed and developed web apps and REST APIs and performed debugging, deployment and data migrations. I am proficient in Web 2.0, API integration, troubleshooting, relational database and content management systems.

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Frequently asked questions

How long do System design projects normally take?

The length of a project depends on many factors, including the scope of your project and the technical complexity of it. When you post a freelance System design project request on Codementor, you’ll have the option to indicate when you’d expect the project to be completed. We suggest chatting with the interested developers to ensure both sides are on the same page. For more information on how to post a freelance System design request on Codementor, check out our article.

How much does it cost to hire a freelance System design developer?

We don’t charge anything when you post a freelance hiring request for System design developers! You’ll have the chance to determine what the budget for your project is when you post the request. You’ll only need to pay the developer if you’re 100% satisfied with their work. Please know that Codementor charges a small service fee when a developer completes the job.

What makes Codementor System design developers different?

We do a comprehensive technical and communications screen of all System design developers at Codementor. Our network includes book authors, popular open source contributors, top Stack Overflow users and engineers at top tech companies. In addition, to continually ensure the quality of our freelancers, we regularly check in on existing System design developers’ user satisfaction rates.

What happens if I’m not happy with the freelancer’s work?

As a platform, we strive to ensure you’re always happy with your System design project’s results. If you’re unsatisfied with the results, you can choose to get a refund for the project. Additionally, you can contact our support team should you need any further assistance with your project.

For more answers to frequently asked questions, see here.

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