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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 - 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 - Tofunmi Samuel
Freelance System design Developer

I'm a Senior Software Engineer and Solutions Architect with 11+ years of experience using technologies such as Java, Python, and JavaScript. I led the delivery of a retail banking engagement platform for a tier-1 bank, which drove 90% transaction growth and supported 10M+ daily transactions. I've also crafted solutions for industries such as fintech, payments, and capital markets. I continually expand my skill set to deliver reliable, high-performance systems at scale.

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 - Oluwatobi Akinseye
Freelance System design Developer5.0 (3 reviews)

I’m a Software Engineering Manager and backend engineer with 13+ years of experience building scalable, reliable software systems and mentoring developers across different experience levels. My expertise spans: ASP.NET Core & C# Backend architecture System design Distributed systems fundamentals Cloud infrastructure DevOps practices Software design patterns Scalable backend systems I also hold multiple AWS certifications, including: AWS Certified Solutions Architect AWS Certified SysOps Administrator AWS Certified DevOps Engineer Over the years, I’ve designed and deployed production infrastructure using: Terraform Docker AWS ECS Application Load Balancers (ALB) CloudFront + S3 static website hosting Docker Swarm on EC2 I’ve led engineering teams, conducted technical interviews, mentored developers, and helped engineers strengthen both their coding and architectural thinking. I enjoy breaking down complex engineering concepts into simple, practical explanations that developers can apply immediately in real-world systems.

Freelance System design Developer - Pavneet Singh
Freelance System design Developer5.0 (2232 reviews)

I am an adept **Full Stack Software Engineer and Architect** and with a wealth of experience in frontend, backend, and Data Structures and Algorithms (DSA) solution development. My expertise spans **clean architecture, TDD(test driven development), code reviews, debugging, and profiling**, enabling the delivery of high-quality solutions within constrained short timeframes. I have worked and collaborated with numerous prominent global blue chip corporations, startups, and international clients. Additionally, have made substantial contributions to Pluralsight and Stack Overflow, boasting a reputation exceeding 37k+ and ranking within the top 0.30% of users on the latter platform. Motto: Full refund in case of no help. Discounts: - Student discount is applied automatically. • Senior software engineer, have worked as a Subject Matter Expert and lead with the primary role to develop features, solve complex bugs, architecture refinements, feature integration, and development. • I intent to deliver a top-quality experience by delivering the most optimal solutions and guidance to enlighten the learners. • I have helped many developers to fix critical bugs and implement complex features on the Codementor platform. • Teaching is one of passing and I have helped numerous mentees on their journey to become successful developers in various fields such as web, native mobile, and big data. • I have expertise in curating and simplifying the content to deliver the best experience with different analogies. • I am deft at feature implementation, debugging, and refactoring. If you have any questions, Feel free to reach out, looking forward to meeting you.

Freelance System design Developer - Brijesh Gupta
Freelance System design Developer5.0 (29 reviews)

Problem Solver,Regular coder , Mentor and a Self taught develor Having Extensive experience in DSA , Java , Spring Boot Micoservices and BIg Data Technologies like Spark,GCP, Cassandra,Kafka,Bq , Apache Hadoop etc. I have been working as DSA and Java Trainer for last 2 years and have trained more than 1000 students and professionals. Learning and Teaching is my passion so I offer discount rate for students and long term tutoring.

Freelance System design Developer - Oluwadara Abijo
Freelance System design Developer5.0 (13 reviews)

Detail-oriented Android Engineer who loves creating amazing mobile experiences for users. Passionate about creating solutions and simplifying processes. Values collaboration with others.

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 - 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.

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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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