Hire the Best Data Structures Specialists

I’m a software engineer with a strong focus on problem solving and algorithms. I’ve solved 7000+ algorithmic problems across platforms like LeetCode and Codeforces, ranking in the top 0.16% on LeetCode and achieving Candidate Master on Codeforces. My background is deeply rooted in data structures, algorithmic thinking, and writing efficient, scalable solutions under constraints. Beyond solving problems myself, I mentor students and engineers to master problem-solving skills for coding interviews and technical assessments. I focus on building strong fundamentals and recognizing patterns.

🧩 Overview / Description I'm a software engineer with 3 years of professional experience in .NET (C#), Python, and SQL, building scalable and efficient backend solutions. Beyond development, I bring the mindset of a competitive programmer — writing optimized, maintainable, and clean code to solve complex real-world problems. Over the past few years, I’ve contributed to backend systems, fraud detection modules, and web applications across different stacks, combining analytical thinking with practical software design. ⚙️ Technical Expertise Languages: C#, Python, C++, SQL Backend: .NET, ASP.NET Core, REST APIs Frontend: React, JavaScript, HTML, CSS Database: SQL Server, MySQL Tools & Concepts: Git, OOP, Software Architecture, Debugging, UML Other: WPF, Shell scripting 🚀 What I Offer Backend development with clean architecture and maintainable code REST API design and integration Bug fixing, debugging, and performance optimization Algorithmic and logic-driven code implementation Collaboration on real-world web or desktop projects 🧠 Highlights Specialist on Codeforces & active LeetCode problem solver ACPC Finalist and TCPC Silver & Bronze Medalist Former Algorithm & Complexity Instructor at university level Experience mentoring developers to improve code quality and efficiency 💬 Let’s Work Together If you’re looking for a developer who writes code with both structure and insight, and can tackle tough problems with precision, I’d love to collaborate. Let’s turn your ideas into efficient, production-ready software.

⭐ 𝑨𝒎𝒐𝒏𝒈 𝑻𝒐𝒑 10 𝑪𝒐𝒎𝒑𝒖𝒕𝒆𝒓 𝑺𝒄𝒊𝒆𝒏𝒄𝒆 𝑻𝒖𝒕𝒐𝒓𝒔 | 3000+ 𝑳𝒆𝒔𝒔𝒐𝒏𝒔 𝑫𝒆𝒍𝒊𝒗𝒆𝒓𝒆𝒅 | 5+ 𝒀𝒆𝒂𝒓𝒔 𝑬𝒙𝒑𝒆𝒓𝒊𝒆𝒏𝒄𝒆 | 𝑺𝒕𝒖𝒅𝒆𝒏𝒕𝒔 𝒊𝒏 40+ 𝑪𝒐𝒖𝒏𝒕𝒓𝒊𝒆𝒔 | 𝑷𝒚𝒕𝒉𝒐𝒏 𝑻𝒖𝒕𝒐𝒓 | 𝑱𝒂𝒗𝒂 𝑻𝒖𝒕𝒐𝒓 | 𝑪++ 𝑻𝒖𝒕𝒐𝒓 | 𝑪 𝑻𝒖𝒕𝒐𝒓 | 𝑪𝒐𝒅𝒊𝒏𝒈 𝑰𝒏𝒕𝒆𝒓𝒗𝒊𝒆𝒘 𝑷𝒓𝒆𝒑 𝑻𝒖𝒕𝒐𝒓 | 𝑫𝒂𝒕𝒂 𝑺𝒕𝒓𝒖𝒄𝒕𝒖𝒓𝒆𝒔 & 𝑨𝒍𝒈𝒐𝒓𝒊𝒕𝒉𝒎𝒔 𝑻𝒖𝒕𝒐𝒓 | 𝙇𝙚𝙚𝙩𝙘𝙤𝙙𝙚 𝑻𝒖𝒕𝒐𝒓 🌟 What My Students Say (based on Reviews on Preply) ⭐️⭐️⭐️⭐️⭐️ “Zain’s explanations in Python & C++ are clear and easy to follow. His teaching style is very informative and easy to understand. He first explains the main concepts and then goes through examples with you". ⭐️⭐️⭐️⭐️⭐️ “The teacher is amazing! He is always prepared for the classes and explains Java concepts very well, asks if I am understanding, does not proceed when there are doubt... ⭐️⭐️⭐️⭐️⭐️ "Zain Makes programming simple and teaches very well. He simplifies the material and explains it clearly." Hi! I’m M. Zain 👋, a Software Enginee with 5+ years of teaching experience in 𝙥𝙧𝙤𝙜𝙧𝙖𝙢𝙢𝙞𝙣𝙜 and 𝙘𝙤𝙢𝙥𝙪𝙩𝙚𝙧 𝙨𝙘𝙞𝙚𝙣𝙘𝙚. So far, I’ve taught 150+ 𝙨𝙩𝙪𝙙𝙚𝙣𝙩𝙨 𝙖𝙘𝙧𝙤𝙨𝙨 40+ 𝙘𝙤𝙪𝙣𝙩𝙧𝙞𝙚𝙨 🌍. ✨ Proven Results with Students ✦ Helped a university student improve from a C grade (58%) to an A grade (89%) in one semester. ✦ Consistently improved learners’ scores by 40–60% on average through structured, interactive lessons. ✦ Guided 15+ students to build and deploy their first full-stack applications, many landing internships afterward. ✦ Coached 20+ O/A Level & IGCSE students, with 90% scoring A or A* in Computer Science & Programming exams. ✨ Certifications & Achievements ✦ Certified in Python Programming, Data Structures & Algorithms, Full-Stack Web Development, and Introduction to Front-End Development (Meta, Coursera). ✦ Winner of multiple coding competitions and hackathons, with top 3 finishes in 5+ national and university-level contests. ✦ Competitive programmer with a Top 10% global ranking on coding platforms (LeetCode & HackerRank). ✨ Teaching Style Engaging, interactive, and results-driven: ✦ Animated Canva slides for visual clarity ✦ Real-world coding projects ✦ Weekly progress tracking & feedback ✦ One-on-one mentorship for problem-solving & interview prep ✨ My secret sauce? Animated Canva slides to help you see the logic, not just read it plus real-world examples and hands-on coding challenges after every session. 👨‍🏫 What I Teach ✦ Programming Languages: Python, Java, C++, C, JavaScript ✦ Core Concepts: OOP, Data Structures & Algorithms, DBMS, Operating Systems, and many more ✦ Databases: MySQL, PostgreSQL, NoSQL ✦ Tools: Git/GitHub, Google Colab, Jupyter Notebook, VS Code, Cursor ✦ MS Office: Word, Excel, PowerPoint ✦ Web Development ✦ Exam Prep: IB, AP, GCSE, IGCSE, and O/A Levels, University Exams / Assignments & Projects 👨‍🏫 Teaching Experience With over 3+ years of teaching programming and computer science, I’ve learned how to turn tricky concepts into “oh, that makes sense!” moments 💡. My approach blends animated Canva slideshows, clear visual aids, and real-life coding examples to make lessons both interactive and memorable. Whether you’re just starting out or tackling advanced topics, I focus on understanding not rote memorization so the concepts truly stick. 🎓 Certifications & Background ✦ O-Level Computer Science = A* ✦ A-Level Computer Science = A ✦ Advanced Programming Coursework (Software Engineering degree, FAST University) 💼 Industry Experience I’m a Full-Stack Software Engineer experienced in building and deploying scalable web applications. ✦ Proficient in React, Node.js, Express, MongoDB, and SQL ✦ Strong foundations in C, C++, Java, Python ✦ Skilled in API development & cloud hosting ✦ Passionate about writing clean code and delivering real-world solutions ✔ Clear Explanations: I break down complex topics like OOP, DSA, and Computer Networks into simple, easy to grasp ideas. ✔️ Engaging Lessons: With animated slides , coding challenges , and real-world examples , learning never feels boring. ✔️ Personalized Approach: Whether you’re a complete beginner or tackling advanced topics, I adjust lessons to your pace and goals. ✔️ Industry Insight: As a Software Engineer, I don’t just teach theory I show you how it’s applied in real projects. ✔ Lifetime Support: Learning with me doesn’t end after class. I’ll always be there to answer your questions and guide you. For me, it’s not about money, it’s about helping you grow. 🤝 Book Your First Lesson Your first session is the perfect chance to see how I teach and how quickly you can start understanding programming concepts. Don’t wait until “someday” to start let’s turn tricky coding problems into aha! moments together. 👉 Book your first lesson today and start learning the smart way!

Software engineer with several years of professional experience specializing in web development. Experienced in designing, developing, and deploying scalable applications and infrastructure. Continuously learning and adapting to emerging technologies to deliver efficient and reliable solutions.

𝐋𝐞𝐭'𝐬 𝐜𝐫𝐚𝐜𝐤: 𝐆𝐨𝐨𝐠𝐥𝐞, 𝐌𝐞𝐭𝐚, 𝐀𝐦𝐚𝐳𝐨𝐧, 𝐌𝐢𝐜𝐫𝐨𝐬𝐨𝐟𝐭, 𝐞𝐭𝐜 - 𝐂𝐨𝐝𝐢𝐧𝐠 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰𝐬 🚀🚀🚀 🧠 𝗪𝗵𝗮𝘁 𝗜 𝗢𝗳𝗳𝗲𝗿: — 1-on-1 mentoring for FAANG interviews — Deep dive into LeetCode patterns — Custom roadmap for your level ⭐️ 𝗥𝗲𝗮𝗱 𝗪𝗵𝗮𝘁 𝗠𝘆 𝗦𝘁𝘂𝗱𝗲𝗻𝘁𝘀 𝗧𝗲𝗹𝗹 𝗔𝗯𝗼𝘂𝘁 𝗠𝗲: "𝘐 𝘩𝘪𝘨𝘩𝘭𝘺 𝘳𝘦𝘤𝘰𝘮𝘮𝘦𝘯𝘥 𝘮𝘺 𝘮𝘦𝘯𝘵𝘰𝘳 𝘧𝘰𝘳 𝘩𝘪𝘴 𝘦𝘹𝘤𝘦𝘱𝘵𝘪𝘰𝘯𝘢𝘭 𝘢𝘣𝘪𝘭𝘪𝘵𝘺 𝘵𝘰 𝘵𝘦𝘢𝘤𝘩 𝘓𝘦𝘦𝘵𝘊𝘰𝘥𝘦 𝘢𝘭𝘨𝘰𝘳𝘪𝘵𝘩𝘮𝘴. 𝘏𝘪𝘴 𝘦𝘹𝘱𝘦𝘳𝘵𝘪𝘴𝘦 𝘢𝘯𝘥 𝘱𝘢𝘵𝘪𝘦𝘯𝘵 𝘨𝘶𝘪𝘥𝘢𝘯𝘤𝘦 𝘮𝘢𝘥𝘦 𝘤𝘰𝘮𝘱𝘭𝘦𝘹 𝘤𝘰𝘯𝘤𝘦𝘱𝘵𝘴 𝘦𝘢𝘴𝘺 𝘵𝘰 𝘨𝘳𝘢𝘴𝘱." — 𝘕𝘢𝘩𝘪𝘥 𝘔𝘶𝘴𝘵𝘢𝘧𝘢 (𝘚𝘦𝘯𝘪𝘰𝘳 𝘚𝘰𝘧𝘵𝘸𝘢𝘳𝘦 𝘌𝘯𝘨𝘪𝘯𝘦𝘦𝘳 @ 𝘈𝘴𝘤𝘦𝘯𝘥 𝘛𝘦𝘤𝘩𝘯𝘰𝘭𝘰𝘨𝘺 - 𝘊𝘢𝘭𝘪𝘧𝘰𝘳𝘯𝘪𝘢, 𝘜𝘚𝘈) 🚀 𝗠𝘆 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁𝘀: — Top 1% in LeetCode — 2150+ contest ranking — 1000+ problems solved — 650K views for solutions 𝗜 𝗠𝗲𝗻𝘁𝗼𝗿: LeetCode, Algorithms, Data Structures, Hackerrank, Python, Java, C++, JavaScript, C#, Go, etc. 𝗥𝗲𝗮𝗱𝘆 𝘁𝗼 𝗮𝗰𝗲 𝘆𝗼𝘂𝗿 𝘁𝗲𝗰𝗵 𝗶𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄? 𝗟𝗲𝘁’𝘀 𝗰𝗼𝗻𝗻𝗲𝗰𝘁! 💬

I can help you with: Fixing Java bugs and errors Writing simple and clean Java programs Data structures and algorithms tasks Object-oriented programming (OOP) concepts Programming assignments and explanations I focus on delivering: Clean and understandable code Fast responses and on-time delivery Clear explanations if needed Whether you need help fixing an issue or completing a task, I will work with you to get it done efficiently.