Hire Top Freelance System design Developers

Olajide Olanrewaju

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.

Tofunmi Samuel

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.

Pavneet Singh

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.

Umair Jameel

● 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/

Oluwatobi Akinseye

With a rich background spanning over a decade in software engineering and management, I bring a wealth of experience to the table. For the past five years, I've not only built and managed globally distributed high-performing teams but also championed software engineering best practices in over 50 US based organizations. As a Technical Delivery Manager at Andela, I had the opportunity to train and implement Scrum and engineering best practices for clients such as IZEA, LevelTen Energy, and Fluxx. This role further honed my expertise in fostering agile environments and driving engineering excellence. As a Professional Scrum Master and agile advocate, I thrive in collaborative environments focused on Cloud computing, DevOps, and Site Reliability Engineering (SRE). Along with being a certified Professional Scrum Master and Product Owner, I hold three AWS certifications: Solutions Architect Associate, SysOps Administrator Associate, and DevOps Engineer Professional. These credentials help me combine agile practices with technical expertise to drive team success. My dedication lies in fostering environments where innovation thrives, leveraging the latest technologies to drive continuous improvement. I'm committed to simplifying complex processes and fostering a culture of learning within teams.

Kshitiz

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

Mike Schinkel

I am **US-based** and have **30+ years experience** during which I have been an AI user, a software engineer, a programming trainer, a marketer and an entrepreneur. My current focus is in **long term tutoring** professional in using **AI**, **software development**, and/or **CI/CD DevOps** Specifically: 1. I specialize in teaching **Claude Code** to non-developers who want to build software 1. I specialize in **Go** and **Bash** but can handle any language; e.g. Python, TypeScript, etc. 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.

Vaibhav Khatri

Staff iOS Engineer with 13+ years of experience building scalable mobile applications across fintech, IoT, and consumer products. I specialize in: - Swift & SwiftUI - Scalable iOS architecture - Performance optimization - Concurrency & memory management - BLE integrations - CI/CD and modularization - AI-assisted development workflows (Codex, Cursor, Claude Code, Copilot) I’ve led critical initiatives for fintech systems handling high-volume transactions, architected BLE communication layers for IoT products, and guided engineering teams through large-scale app refactors and rebranding efforts. I can help with: - Debugging difficult production issues - Architecture reviews - Scaling iOS codebases - Interview preparation for senior/staff roles - AI-first development workflows - Code reviews and performance optimization - Swift concurrency and clean architecture My mentoring style is practical and outcome-focused — helping engineers move faster while improving code quality and maintainability.

Harshit Varshney

I love building high-impact products that push me to think creatively and solve complex problems. I have designed and developed **large-scale, highly available systems** from scratch, delivering **high-throughput, fault-tolerant applications** that serve millions of users. My expertise spans **Java**, **NoSQL**, **Serverless Computing**, and **distributed systems**, with a strong focus on scalability and reliability. I’m equally passionate about **mentoring**, having guided 100+ students and professionals in **DSA, system design**, and interview preparation.

Lenka Pitonakova, PhD

**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.