Rezwan Ahmed Sami

Chief Technology Officer | Engineering Leader | Innovation Architect

📍 Sylhet Sadar, 3100, Bangladesh
📧 [email protected]
🔗 LinkedIn | 💻 GitHub

Executive Summary

Visionary Chief Technology Officer with extensive progressive leadership experience driving digital transformation and technological innovation at scale. Successfully led cross-functional engineering teams while overseeing strategic technology roadmaps for high-growth platforms generating significant business value. Proven expertise in scaling engineering organizations, architecting enterprise-grade systems, and translating complex technical solutions into measurable business outcomes. Creator of Catzilla framework and contributor to major open-source initiatives including Rust language development. Combines deep technical expertise with executive leadership to deliver sustainable competitive advantages through technology excellence and innovation-driven growth strategies.

Key Achievements

Professional Experience

Chief Technology Officer (CTO)

September 2023 – Present

Rightbiz Ltd. | London, UK

  • Strategic Leadership: Direct technical vision and strategy for enterprise-scale search engine and e-commerce platforms serving substantial user bases with global reach
  • Team Management: Lead and mentor a cross-functional engineering team, establishing agile methodologies that significantly enhanced delivery velocity and team productivity
  • Architecture Excellence: Architect and implement robust microservices infrastructure supporting enterprise-grade uptime and handling high-volume API traffic at scale
  • Innovation Drive: Champion emerging technologies and best practices, resulting in substantial improvements in application performance and enhanced user experience
  • Stakeholder Engagement: Collaborate with C-suite executives to align technology roadmap with business objectives and growth strategies

Lead Product Manager

April 2023 – September 2023

Rightbiz Ltd. | London, UK

  • Product Strategy: Spearheaded product development initiatives for multiple major platforms, achieving substantial increases in user engagement through data-driven feature prioritization
  • Cross-functional Leadership: Managed diverse interdisciplinary teams across engineering, design, and marketing, significantly improving project delivery timelines and team efficiency
  • Analytics Implementation: Introduced comprehensive analytics framework and KPI tracking, enabling data-driven decision making and notable improvements in product performance
  • Stakeholder Management: Facilitated alignment between business objectives and technical execution, ensuring successful product launches and market adoption

Product Manager

October 2022 to April 2023

Rightbiz Ltd. - London.

  • Coordinated end-to-end product development lifecycles, from concept to deployment.
  • Developed detailed roadmaps, ensuring alignment with organizational objectives.
  • Fostered collaboration between engineering, design, and marketing teams.

Software Engineer

June 2021 to October 2022

Rightbiz Ltd. - London.

  • Contributed to the development of core platforms, focusing on performance optimization and scalability.
  • Collaborated with stakeholders to design and implement new features.
  • Maintained high code quality standards through peer reviews and rigorous testing.

Founder & CEO

February 2023 to September 2023

Pictulbo - Sylhet, Bangladesh

  • Conducted a market test for an innovative online marketplace for photographers, connecting clients with professionals.
  • Designed and implemented a user-friendly platform to streamline bookings and portfolio showcasing.
  • Evaluated market conditions and determined the timing was not suitable for scaling, leading to the project's closure.

Projects

Catzilla – Blazing-fast Python Web Framework

Role: Creator & Lead Developer

  • Project Description: Developed Catzilla, a modern Python web framework purpose-built for extreme performance and developer productivity. Features a sophisticated C HTTP engine built using libuv and llhttp with an advanced trie-based routing system that delivers O(log n) route lookup performance.

  • Key Responsibilities & Achievements:

    • Architected and implemented a hybrid C/Python core with event-driven I/O in C, exposed through a clean Pythonic API.
    • Developed an advanced trie-based routing system with O(log n) lookup performance and dynamic path parameters support.
    • Created zero-dependency framework using only Python standard library, eliminating bloat and external dependencies.
    • Implemented GIL-aware bindings supporting concurrency, streaming, and WebSockets for real-time applications.
    • Built comprehensive testing suite with extensive coverage across both C core and Python integration.
    • Designed production-grade memory management with zero memory leaks and efficient allocation strategies.
    • Developed decorator-style routing API (@app.get(...)) with zero boilerplate for maximum developer productivity.

  • Technologies/Tools Used: C, Python, libuv, llhttp, Advanced Data Structures (Trie), Memory Management, Concurrency

  • Impact: Engineered for high-throughput microservices, real-time AI applications, and low-latency APIs with maximum efficiency.

Research – Semi-Decentralized Encrypted Database (SDED)

Role: Lead Researcher

  • Project Description: Published a research paper on a semi-decentralized encrypted database framework designed for sustainable data management in distributed systems.

  • Key Responsibilities & Achievements:

    • Developed the framework focusing on cost efficiency and data security.
    • Published research in an academic journal (Academia.edu) and presented findings at a tech conference.
    • Received positive feedback for the innovative approach to decentralization in database management.

RouteMamba – JavaScript Library for Single-Page Applications

Role: Creator & Developer

  • Project Description: Developed RouteMamba, a powerful and flexible JavaScript library for building seamless single-page applications (SPAs). Unlike other libraries like React.js or Next.js, RouteMamba simplifies the routing process without the need for complex setups or page reloads. It empowers developers to create highly customizable, dynamic, and interactive web apps with unparalleled control, making it an ideal choice for developers seeking simplicity and efficiency.

  • Key Responsibilities & Achievements:

    • Designed and developed routing solutions for SPAs, ensuring smooth user experiences without the need for traditional page reloads.
    • Created a clean, minimal API that makes it easy to implement routing features such as dynamic routes and state-based navigation.
    • Developed the library using TypeScript for strong typing and improved developer productivity.
    • Published RouteMamba as an open-source project, providing developers with a free, powerful alternative to large frameworks.
    • Promoted the library through documentation and a dedicated website, receiving positive feedback from the developer community.

  • Technologies/Tools Used: TypeScript, JavaScript, Node.js, Git, HTML, CSS

  • Website: https://routemamba.rezwanahmedsami.com/

Rust Programming Language Contributions

Role: Contributor

  • Project Description: Contributed to the Rust Programming Language repository, improving its functionality, test cases, and resolving issues related to f16 and f128 floating-point conversions. Focused on enhancing Rust's capabilities for working with floating-point numbers and their conversion in WebAssembly (wasm).

  • Key Responsibilities & Achievements:

    • Addressed and fixed issues in rust-lang/rust related to f16 and f128 float conversions, contributing to better compatibility with WebAssembly.
    • Collaborated with the Rust community and maintained code quality through pull requests and peer review processes.
    • Successfully implemented targeted tests with the #[cfg(target_arch = "x86_64")] flag to handle architecture-specific floating-point operations.

  • Technologies/Tools Used: Rust, Git, GitHub

Skills

Programming Languages: JavaScript, TypeScript, Python, C, C++, Rust, Java, Kotlin, Swift, C#, PHP, Dart (Flutter), SQL, Zig

Web Development & Frameworks: React, React Native, Angular, Node.js, Bun.js, Tauri, libuv, llhttp

Databases & Tools: MySQL, MongoDB, Typesense (In-memory database), Weaviate (Vector database), Firebase, OneSignal

Version Control & DevOps: Git, GitHub, Docker, AWS, XAMPP, CI/CD

System Architecture & Performance: Scalable Architecture Design, Event-driven Programming, Memory Management, Concurrency, High-Performance Computing, Trie-based Data Structures, O(log n) Algorithm Optimization

Product & Project Management: Product Management, Project Management Tools Proficiency, Market Analysis, Performance Driving, Strategic Project Planning, Scalability Planning, Project Prioritisation, Software Development Life Cycle, Consulting, Technology Roadmap Development

Leadership & Mentorship: Strategic Thinking, Executive Communication, People Management, Training and Mentoring, Visionary Leadership, Clear Communication, Technical Leadership

Operations & Management: Operations Management, General Management and Administration, IT Service Management, Budget Control and Forecasting, Operations Oversight, Policy Development

Technical Expertise: Data Analysis, DevOps Principles, Client and Server Networks, Cybersecurity Awareness, Data-driven Decision-making, Mobile Application Development, Web Development, HR Systems Knowledge

Soft Skills: Effective Communication, Problem Solving, Adaptability, Global Mindset

Recognition & Additional Achievements

Professional Certifications

  • Software Architecture & Technology of Large-Scale Systems – Udemy (2024)
  • Strategy and Operations – International Business Management Institute, Berlin, Germany (2023)

Notable Accomplishments

  • Product Leadership: Successfully launched and scaled multiple high-impact products including MyBouquet and MosquePay, achieving significant market penetration and user adoption
  • Open Source Contributions: Active contributor to Rust Programming Language ecosystem, enhancing core functionality and collaborating with global development community
  • Research Publication: Authored and published peer-reviewed research on distributed database systems, contributing to academic and industry knowledge base
  • Framework Development: Created and maintained multiple open-source frameworks, demonstrating thought leadership in web development technologies

Publications

"Semi-Decentralized Encrypted Database (SDED) Framework: Enabling Sustainable Data Management and Cost Efficiency in Distributed Systems"

Author: Rezwan Ahmed Sami

Published on: Academia.edu

Summary: This paper introduces the SDED framework, which improves data security and cost-efficiency in distributed systems by combining decentralized encryption with efficient data management practices. It highlights its potential for enhancing sustainability in cloud-based data environments.

Education & Professional Development

Self-Directed Computer Science Education

Specialized Focus: Computer Science, Advanced Programming, System Architecture, and Distributed Systems

Continuous Learning: Actively engaged in cutting-edge technology research, open-source contributions, and industry best practices

Executive Education & Certifications

  • Software Architecture & Technology of Large-Scale Systems – Udemy (2024)
  • Strategy and Operations – International Business Management Institute, Berlin, Germany (2023)
  • Advanced System Design – Self-directed research and implementation
  • Leadership & Management – Practical experience leading engineering teams

Languages

Bengali: Native Proficiency (C2)

English: Advanced Professional Proficiency (C1)

Hindi: Basic Conversational (A1)

Professional Interests

Core Focus Areas: Open-source ecosystem development, Advanced system architecture research, Performance optimization and scalability, Emerging technology evaluation and adoption

Industry Engagement: Technical conference speaker, Research paper author, Open-source contributor, Technology innovation advocate