Available to hire
I’m Obi Celestine Chukwunenye, a Senior Software Engineer and technology entrepreneur with over seven years of experience delivering high-quality software solutions. I lead product development, architect scalable backends, and mentor developers; founder of Estyne International Limited and the Cre8 Afrika Fellowship, and co-founder of Estyne Tech Spot Limited. I enjoy solving complex problems, shipping production-ready features, and helping teams stay motivated and productive.
I have a strong background in Python, Dart, PHP, Java, Kotlin, Swift, TypeScript, and SQL, with expertise in frameworks and tools such as Flutter, Django, Flask, React Native, ReactJS, and Laravel. I’ve delivered web and mobile apps for clients worldwide, built production-grade APIs, and contributed to developer capacity building and digital transformation initiatives in Africa. I’m excited by collaborative environments that push innovation and impact.
Skills
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Language
English
Fluent
Work Experience
Frontend/Mobile/Backend Developer (Freelance/Contract) at Rooksbridge Limited
June 1, 2025 - August 26, 2025Led development of a Feed alert system increasing feed level prediction accuracy by 35%, enabling real-time monitoring and tracking of agricultural feeds. Built high-performance web services/APIs using Python (Flask) reducing data exchange latency by 40% across multiple platforms. Implemented MQTT protocol to streamline communication with Telit IoT devices, boosting data capture and storage speed by 50%. Developed unit and functional tests achieving 95% coverage, ensuring backend system reliability and stability. Integrated third-party services improving app functionality and user engagement by 20%. Practiced Agile methodologies, reducing project delivery times by 15%, while optimizing backend performance and security resulting in 25% gains. Streamlined collaboration using Git, improving team productivity by 20%.
Frontend/Mobile/Backend Developer (Freelance/Contract) at Rooksbridge Limited
June 1, 2025 - August 26, 2025Specialised in providing innovative IT services tailored to diverse business needs, empowering organisations to achieve digital transformation goals and drive growth by utilising leading technologies and expert solutions. Led the development of a Feed Alert system, improving prediction accuracy by 35% and enabling real-time tracking in agricultural feed silos. Built high-performance web services/APIs using Python (Flask), reducing data exchange latency by 40% across web, Android, and iOS applications. Integrated MQTT protocol for streamlined communication with IoT devices, accelerating data capture and storage by 50%. Developed comprehensive test scripts achieving 95% coverage and ensured backend reliability. Integrated third-party services enhancing app functionality and user engagement by 20%. Practiced Agile methodology to reduce project delivery time by 15%, optimised backend infrastructure improving performance and security by 25%, and streamlined team collaboration using Git vers
Frontend/Mobile/Backend Developer (Freelance/Contract) at Rooksbridge Limited
June 1, 2025 - August 26, 2025Rooksbridge Limited specializes in providing innovative IT services tailored to diverse business needs, empowering organizations to achieve digital transformation goals by leveraging leading technologies and expert solutions. I led the development of a Feed alert system that increased feed level prediction accuracy by 35%, improved monitoring, and enabled real-time tracking of agricultural feeds in silos. Built high-performance web services/APIs using Python (Flask), reducing data exchange latency by 40% across web, Android, and iOS applications. Implemented MQTT protocol to streamline communication with Telit IoT devices, resulting in 50% faster data capture and storage in MongoDB for real-time analytics. Developed functional and unit test scripts in Python achieving 95% test coverage. Integrated third-party services like Firebase Cloud Messaging, weather API, Mailjet, and postcode services enhancing app functionality and increasing user engagement by 20%. Designed and developed an ad
Operations Lead & Co-Founder at Estyne Tech Spot Limited
October 1, 2024 - November 1, 2025Built operations from the ground up for a retail and services company, including vendor sourcing, inventory management, POS, and after-sales support. Designed a lightweight Inventory/POS system to track stock, sales, and expenses, and implemented online catalog workflows. Delivered solar and CCTV deployments for homes and SMEs, improved security and reliability, and established a streamlined online catalog and customer support workflow to increase repeat business and referrals.
Mobile Application Developer (Contract) at iSync Consulting Ltd
November 1, 2023 - August 26, 2025Developed and launched high-performance iOS and Android mobile applications using a single codebase, reducing development time by 50% and costs by 40%. Designed intuitive user interfaces with Material Design improving user satisfaction by 30%. Integrated strong authentication systems such as OAuth and JWT, enhancing security by 45%. Implemented real-time features like chat, notifications, and live updates using WebSocket and Firebase, boosting user engagement by 35%. Collaborated with cross-functional teams ensuring alignment with project goals and improving team productivity by 20%. Optimized app performance reducing load times by 40%, improving battery efficiency by 25%. Developed comprehensive unit and widget tests achieving 95% coverage and reducing post-release bugs by 30%.
Mobile Application Developer (Contract) at iSync Consulting Ltd
November 1, 2023 - August 26, 2025Developed and launched high-performance iOS and Android mobile applications using a single codebase, reducing development time by 50% and cutting costs by 40%. Designed intuitive, user-friendly interfaces with Material Design, improving user satisfaction by 30% and ensuring responsiveness. Integrated strong authentication systems such as OAuth and JWT, enhancing security by 45%. Implemented real-time features including chat, notifications, and live updates using WebSocket and Firebase, boosting app engagement by 35%. Collaborated with cross-functional teams ensuring alignment with project goals and improving team productivity by 20%. Optimised app performance reducing load times by 40%, improved battery efficiency, and minimised memory usage resulting in smoother user experience. Developed comprehensive unit and widget tests achieving 95% coverage and reduced post-release bugs by 30%.
Mobile Application Developer (Contract) at iSync Consulting Ltd
November 1, 2023 - August 26, 2025Developed and launched high-performance mobile applications for iOS and Android using a single codebase, reducing development time by 50% and cutting costs by 40%. Designed and implemented intuitive, user-friendly interfaces with Material Design, improving user satisfaction by 30% and ensuring smooth responsiveness across all screen sizes. Integrated strong authentication systems such as OAuth and JWT, enhancing security by 45% and ensuring top-tier data protection and privacy. Successfully implemented real-time features like chat, notifications, and live updates using WebSocket and Firebase, boosting app engagement by 35% and responsiveness by 25%. Collaborated with cross-functional teams ensuring 100% alignment with project goals and delivering smooth app development while improving team productivity by 20%. Optimized app performance, reduced load times by 40%, improved battery efficiency by 25%, and minimized memory usage, resulting in a smoother user experience. Developed and execu
Software Developer (Freelance) at Fiverr International
December 1, 2022 - August 26, 2025Provided freelance software development services across various projects ensuring client satisfaction.
Software Developer (Freelance) at Fiverr International
December 1, 2022 - August 26, 2025Provided freelance software development services delivering custom solutions via the Fiverr platform.
Software Developer (Freelance) at Fiverr International
December 1, 2022 - August 26, 2025Provided freelance software development services on various projects, enhancing client applications and web solutions.
Mobile Application Developer (Contract) at Saboura.net
April 1, 2021 - August 26, 2025Developed a high-performance educational mobile app increasing user engagement by 65% and student enrollment by 75%.
Mobile Application Developer (Contract) at Saboura.net
April 1, 2021 - August 26, 2025Contract role developing high-performance educational applications, increasing user engagement by 65% and student enrollment by 75%.
Mobile Application Developer (Contract) at Saboura.net
April 1, 2021 - August 26, 2025Developed a high-performance educational app increasing user engagement by 65% and student enrollment by 75%.
Mobile Application Developer (Contract) at iSync Consulting Ltd
February 1, 2021 - November 1, 2023Developed and launched high-performance mobile applications for iOS and Android from a single codebase, significantly reducing development time and costs. Implemented OAuth/JWT-based authentication, real-time features using WebSocket and Firebase, and a strong backend integration to support live features and secure data flow. Collaborated with cross-functional teams to deliver polished apps with reliable performance.
Frontend/Mobile/Backend Developer (Freelance/Contract) at Rooksbridge Limited
September 1, 2020 - June 1, 2025Led development of web services and APIs using Python (Flask) and web/mobile front-ends, built high-performance APIs, reduced data exchange latency, implemented MQTT for IoT device communication, and introduced automated tests and CI/CD pipelines to improve delivery speed and reliability. Collaborated across teams to optimize infrastructure and ensure code quality.
Web Designer (Contract) at Majoroh Partnership
June 1, 2020 - August 26, 2025Provided web design services improving user experience and interface aesthetics according to client specifications.
Web Designer (Contract) at Majoroh Partnership
June 1, 2020 - August 26, 2025Designed advanced web portals improving data visualization and user interactions through tables, Google Maps, and AJAX seamless APIs.
Web Designer (Contract) at Majoroh Partnership
June 1, 2020 - August 26, 2025Designed innovative and user-friendly websites aligning with client requirements and brand identity.
Web Designer (Contract) at Majaro h Partnership
December 1, 2019 - June 1, 2020Provided web design services for client partnerships, delivering intuitive UI/UX, responsive designs, and effective front-end implementations to support marketing and product goals.
Technical Lead/Founder at Estyne International Limited
August 1, 2019 - PresentLed design and launch of multiple software products used by SMEs and startups; architected secure, scalable backends and APIs; recruited and mentored a high-performing dev team; established the Cre8 Afrika Fellowship mentoring hub to guide beginners and advanced developers in product building and monetization.
Technical Lead / Founder (Full-Time) at Estyne International Limited
August 1, 2019 - PresentLed development and successful launch of multiple software products resulting in 60% increase in user adoption and highly positive client feedback. Scaled development team by 40% through recruitment and mentoring, boosting team productivity by 35% and promoting collaborative innovation. Architected scalable and secure software solutions supporting 50% business growth while meeting evolving client needs. Secured major client contracts and partnerships driving a 30% revenue increase and expanded market reach across key sectors. Directed design and development balancing technical execution with strategic planning to achieve optimal outcomes. Led developer teams on best practices ensuring timely delivery of high-quality software and reducing project delays by 25%.
Technical Lead / Founder (Full-Time) at Estyne International Limited
August 1, 2019 - PresentLed the development and successful launch of multiple software products, resulting in a 60% increase in user adoption and highly positive client feedback. Scaled the development team by 40% while recruiting and mentoring top talent, boosting team productivity by 35% and fostering a culture of collaboration and innovation. Architected scalable, secure software solutions supporting 50% business growth while meeting evolving client needs. Secured major clients and partnerships, driving a 30% increase in revenue and expanding market reach. Directed design and development balancing technical execution with strategic planning to achieve optimal outcomes. Led a team of developers focusing on best practices, timely delivery of high-quality software and reducing project delays by 25%.
Technical Lead / Founder (Full-Time) at Estyne International Limited
August 1, 2019 - PresentLed the development and successful launch of multiple software products, resulting in a 60% increase in user adoption and receiving highly positive client feedback. Scaled the development team by 40% while recruiting and mentoring top talent, boosting team productivity by 35% and promoting a culture of collaboration and innovation. Architected scalable, secure software solutions supporting 50% business growth while ensuring they met clients' evolving needs. Secured major clients and partnerships, driving a 30% increase in revenue and expanding the company’s market reach across key sectors. Directed the design and development of the latest solutions balancing technical execution with strategic planning to achieve optimal outcomes. Led a team of developers focusing on best practices, ensuring the timely delivery of high-quality software and reducing project delays by 25%.
Android Application Developer (Contract) at Alalathefarmer
May 1, 2019 - August 26, 2025Developed Android applications supporting business functions related to farming and agriculture.
Android Application Developer (Contract) at Alalathfarmer
May 1, 2019 - August 26, 2025Developed Android applications focused on agricultural service improvement.
Android Application Developer (Contract) at Alalathfarmer
May 1, 2019 - August 26, 2025Developed an Android app focusing on efficient agricultural management solutions.
Android Application Developer (Contract) at Alalath E farmer
April 1, 2019 - May 1, 2019Delivered Android applications for agriculture-related use cases, focusing on performance, usability, and offline capabilities, with attention to reliability in field deployments.
Mobile Application Development (Contract) at Saboura.net
February 1, 2019 - April 1, 2021Contributed to mobile app development projects, delivering robust mobile experiences and integrating backend services to meet client requirements. Helped optimize performance and ensure quality across platforms.
Software Developer (Freelance) at Fiverr International
January 1, 2019 - December 1, 2022Provided freelance software development services, delivering client-focused apps and features across multiple platforms with attention to quality and timely delivery.
Education
Bachelor of Science (Computer Science) at Middlesex University, London, UK
September 1, 2020 - September 1, 2021Advanced Diploma (Software Engineering) at Aptech Computer Education, Mumbai, India
February 1, 2017 - February 1, 2019Bachelor of Science (Computer Science) at Middlesex University, London, UK
September 1, 2020 - September 1, 2021Advanced Diploma (Software Engineering) at Aptech Computer Education, Mumbai, India
February 1, 2017 - February 1, 2019Bachelor of Science (Computer Science) at Middlesex University, London, UK
September 1, 2020 - September 1, 2021Advanced Diploma (Software Engineering) at Aptech Computer Education, Mumbai, India
February 1, 2017 - February 1, 2019Bachelor of Science in Computer Science at Middlesex University, London, UK
September 1, 2020 - September 1, 2021Advanced Diploma in Software Engineering at Aptech Computer Education, Mumbai, India
February 1, 2017 - February 1, 2019Qualifications
Andela Scholarship Programme (Nanodegree in Advanced Software Development)
January 11, 2030 - August 26, 2025Nanodegree in Advanced Software Development (Andela Scholarship Programme)
January 11, 2030 - August 26, 2025Andela Scholarship Program - Nanodegree in Advanced Software Development
January 11, 2030 - August 26, 2025Aptech Global Tech Wiz Competition Winner
January 11, 2030 - December 1, 2025Best Mobile App Developer Award
January 11, 2030 - December 1, 2025Leadership in Technical Innovation Award, Estyne International Limited
January 11, 2030 - December 1, 2025Industry Experience
Software & Internet, Agriculture & Mining, Education, Professional Services, Media & Entertainment
Skills
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