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.

⭐ 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!

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! 💬

Most HubSpot problems aren't a HubSpot problem they're a system problem. Leads go cold because follow-ups are inconsistent. Deals stall because pipelines don't reflect how your team actually sells. Automation fires at the wrong moment. Data becomes unreliable. Your sales team ends up doing manually what HubSpot should be doing automatically. That's where revenue quietly disappears. And that's exactly what I fix. The businesses I work with don't have a tool problem. They have a system that was never properly built. HubSpot was set up in a hurry, or built by someone who understood the software but not the sales process behind it. So it sits there technically running, practically useless. I come in and rebuild it the right way. Around your pipeline, your sales cycle, your team, and the way your business actually closes deals. What I build for you, CRM setup & architecture Full HubSpot portal configuration from scratch pipeline design aligned to your real sales cycle, lifecycle stages, lead statuses, contact segmentation, and property mapping built for clarity and scale. Workflow & marketing automation Lead routing, follow-up sequences, deal management workflows, and behavior-triggered automations the right message to the right prospect at the right time, without manual effort. Lead nurturing & email marketing Automated sequences that move prospects through your funnel. Customer journey mapping, segmentation, and personalisation logic built inside HubSpot Marketing Hub. Sales process & pipeline optimisation Pipeline restructuring for higher close rates. Deal stage alignment, sales handoff systems, KPI dashboards, and HubSpot reporting that gives your team full visibility. Integrations & system connectivity HubSpot connected to the tools your business runs on Zapier, native integrations, API connections, and cross-platform data sync configured for reliable real-time flow. HubSpot migration & data cleanup Clean migrations from spreadsheets, legacy CRMs, or disorganised portals. Deduplication, property mapping, and full system restructuring delivered clean and ready to scale. What changes after we work together Your CRM becomes something your team actually relies on. Leads get followed up faster. Pipelines reflect reality. Automation handles the repetitive work. Data stays clean. And your sales process becomes something you can measure, optimise, and grow with confidence. Who I work with — Startups building their first structured CRM system — B2B service businesses scaling their sales process — SaaS companies improving onboarding and retention — Agencies needing white-label HubSpot implementation — Sales teams replacing manual processes with reliable automation. Let's talk Send me a message with what's broken in your HubSpot or where you're starting from scratch. I'll tell you exactly how I'd fix it or build it.

✅ Candidate Master on Codeforces (rating : 𝟭𝟵𝟭𝟱) ✅ Guardian(Top 0.3%) on LeetCode (rating : 𝟮𝟰𝟯𝟴) ✅ 6* on CodeChef (rating : 𝟮𝟮𝟬𝟱) ✅ 𝟱+ years of experience in Competitive Programming ✅ Solved 𝟰𝟬𝟬𝟬+ programming problems ✅ Expert in Data Structure and Algorithm 👋 Welcome to my profile! If you're looking to sharpen your coding skills, boost your rankings on platforms like Codeforces, LeetCode, and CodeChef, master data structures and algorithms, or prepare for coding interviews, you're in the right place! I am Md. Farhan Yousuf, a passionate and skilled competitive programmer holding the title of Candidate Master(𝟭𝟵𝟭𝟱) on Codeforces, consistently ranking in the top 0.3%(𝟮𝟰𝟯𝟴) on LeetCode, and a 6-star(𝟮𝟮𝟬𝟱) coder on CodeChef. With extensive experience in algorithm design, data structures, and problem-solving, I am dedicated to helping others excel in competitive programming and understand the core principles of Data Structures and Algorithms. 💼 𝗠𝘆 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲: 🔹 5+ Years of DSA, Competitive Programming and Problem Solving (Since 2020) 🔹 2-time Finalist in ICPC Asia West Continent Finals 🌍 🔹 Participant in ICPC Dhaka Regional, NCPC, and multiple IUPCs 🔹 400+ Contests Across Codeforces, CodeChef, LeetCode, and AtCoder 🏁 📚 𝗪𝗵𝗮𝘁 𝗜 𝗢𝗳𝗳𝗲𝗿: 🎓 One-on-One Problem-Solving Sessions – Learn how to think and code efficiently. 🎓 LeetCode Interview Preparation – Get ready for FAANG-level interviews. 🎓 Competitive Programming Tutoring – Boost your rankings with structured training. 🎓 DSA Mastery – Learn algorithms like DP, Graphs, Trees, and more! 🎓 ICPC Training & Contest Strategy – Prepare for ICPC with tailored training and contest strategies. 🔑 𝗜 𝗵𝗮𝘃𝗲 𝗺𝗮𝘀𝘁𝗲𝗿𝗲𝗱 𝘁𝗵𝗲 𝗳𝗼𝗹𝗹𝗼𝘄𝗶𝗻𝗴 𝘁𝗼𝗽𝗶𝗰𝘀: 🟢 Arrays | Strings | Stacks | Queues | Linked Lists | Binary Search 🟢 Recursion | Backtracking | Sliding Window | Two Pointers 🟢 Graphs | BFS | DFS | Dijkstra’s & Bellman-Ford Algorithms | Topological Sort 🟢 Trees | Segment Trees | Lazy Propagation | Tries 🟢 Dynamic Programming | Knapsack | LIS | LCS | DP on Graphs & Trees 🟢 Disjoint Set Union (DSU) | Kruskal’s & Prim’s Algorithm | Floyd-Warshall 🟢 Bit Manipulation | Number Theory | String Algorithms 🟢 Sqrt Decomposition | Mo’s Algorithm | Combinatorics 🟢 And many more. ✨ 𝗪𝗵𝘆 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲? ✔ One-on-One Coaching 🤝 ✔ Personalized Learning Plan 🎯 ✔ Step-by-Step Problem Solving Approach 🧩 ✔ Proven Track Record of Success 🚀 ✔ Flexible Availability & Timely Delivery ⏳ ✔ Clean, Bug-Free Code ✅ ✔ I simplify complex topics and explain them in the easiest way 💡 ✔ Guided many students who have successfully improved their problem-solving skills 🎓 🤝 I look forward to working with you and contributing to your success in the world of DSA and competitive programming and beyond. Let's achieve great things together! Thank you for visiting my profile !

🧩 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.