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Hello! I'm the person behind the keyboard who loves to bring ideas to life through code. With a knack for both the logic of backend development and the finesse of frontend design, I've spent my career as a navigating the complexities of software development. My journey has taken me across the globe, virtually speaking, working with an incredible array of clients from different cultures. This has not only sharpened my technical skills but also taught me the importance of clear communication and understanding diverse perspectives.
My approach to technology is simple: it's about making things that work beautifully, both inside and out. Whether I'm debugging a back-end system or polishing a user interface, my goal is to create something that's not just functional, but also a joy to use. This passion extends beyond my work. I founded Codebility, a community where I share my love for coding by teaching others for free. It's my way of giving back, hoping to light the same spark in others that coding ignited in me.
At the heart of it all, I'm a problem solver, a creative thinker, and a team player who believes in the power of collaboration. Each new project is an adventure—an opportunity to challenge myself, learn new things, and contribute to making the digital world a bit more user-friendly. I'm excited about the possibility of bringing my blend of skills, experience, and passion to your team. Let's create something great together!

Kind words from clients and teammates I've worked with.
Add a real client quote here — what Zeff built, how he worked, and the impact it had on the project.
Add a second testimonial — ideally one that mentions a concrete result, deadline met, or problem solved.
Add a third testimonial — a teammate or mentee works great here, given the 100+ interns mentored.
As a Full Stack Developer at Halrtech in the UK, I built Halrcall, an AI-driven marketing automation platform that autonomously creates and runs campaigns across ads, marketing, sales, and follow-up. Built with Next.js and Tailwind CSS, the platform generates campaign content, schedules outreach, and sends emails automatically, leveraging OpenAI to let teams launch and nurture multi-channel campaigns with minimal manual effort.
As a Full Stack and Mobile Developer at FixFlow in the US, I built RepairCoin, a blockchain-and-AI rewards ecosystem for repair businesses. Customers earn rewards, make payments, and redeem tokens, while shops run AI-assisted marketing campaigns, manage customers, and sell services. I developed the Next.js web platform with integrated AI and on-chain token infrastructure, an admin layer for managing shops and customers network-wide, and a companion React Native mobile app for iOS and Android.
As a Full Stack Developer at Physiocall in Australia, I built AskLuci, a clinic engagement platform for a 2025 healthcare challenge that rallied clinics toward a collective one-million milestone event. I developed both the member-facing experience and the administrative back office using Next.js and Tailwind CSS, with deep GoHighLevel integration to automate CRM workflows, campaign delivery, and lead nurturing. I implemented real-time progress tracking, automated communications, and a streamlined onboarding flow that kept participating clinics engaged throughout the campaign.
As a Full Stack Developer at Stanton in the US, I built a suite of internal operations platforms for a real-estate firm that buys, sells, and leases properties — spanning construction, maintenance, payroll, and utility management. Using Next.js, TypeScript, Tailwind CSS, and a Supabase/PostgreSQL backend, I integrated the apps with AppFolio, RingCentral, and other business tools to keep property and financial data in sync, automating workflows like utility bill-back, reconciliation, and period close.
Worked as a FullStack Mobile Developer on the Compound app, a UK-based pension platform designed to simplify pension management for users. Leveraged AWS for scalable cloud services, ensuring secure and reliable backend infrastructure. Built and maintained mobile applications using React Native, delivering a seamless user experience across both iOS and Android platforms. Collaborated with cross-functional teams to develop intuitive user interfaces, implement API integrations, and optimize performance. Focused on ensuring data security and compliance with UK pension regulations. Played a key role in deploying new features and enhancing the app’s functionality to meet evolving user needs.
Worked as a FullStack Developer on a cutting-edge trading platform, delivering seamless functionality and user experience for financial market applications. Utilized modern web technologies, including React.js, Next.js, and Node.js, to develop responsive front-end interfaces and robust back-end services. Designed and implemented secure API integrations for real-time data updates and transaction processing. Collaborated closely with stakeholders to ensure compliance with financial regulations and to tailor solutions to user requirements. Focused on optimizing application performance, maintaining code quality, and deploying scalable solutions to support high user traffic. Played a critical role in delivering timely updates and new features for the platform.
Worked as a FullStack Mobile Developer, focusing on building and deploying scalable mobile applications using Next.js and React Native. Integrated Firebase for real-time database functionality, authentication, and cloud storage, ensuring seamless performance and user experience. Collaborated on end-to-end development processes, including UI/UX design implementation, API integrations, and testing. Successfully deployed applications to both Google Play Store and Apple App Store, adhering to platform-specific guidelines and ensuring cross-platform compatibility. Played a key role in improving app performance and maintaining a clean, reusable codebase while ensuring timely updates and feature enhancements.
In 2023, as a Full Stack Developer | Mobile Developer at Decenternet in Korea, I led the integration of AI and blockchain technologies into our web and mobile platforms. I designed applications utilizing OpenAI's APIs and developed secure blockchain solutions, employing React for front-end and Node.js with Express for the backend. My responsibilities extended to deploying applications using Nginx, ensuring scalability and security across environments. Through agile methodologies, I managed project deliverables, fostering innovation and positioning Decenternet as a leader in cutting-edge technology integration.
In 2023, as a Full Stack Developer | Mobile Developer at Autopilot in the US, I developed a CRM platform for outsourcing services, managing both web and mobile versions with Next.js and Supabase. My role involved creating scalable, efficient solutions to enhance operational workflows and user experiences. Employing agile methodologies, I ensured seamless project execution, contributing to Autopilot's innovation in CRM and outsourcing services
I was responsible for building an e-commerce platform that seamlessly integrated with major marketplaces such as eBay, Amazon, and Square. This platform enabled resellers to efficiently market and sell products. The development stack included React for the frontend and Node.js with Express for the backend. The project was organized into two-week sprints to ensure a structured and efficient development process.
I became a member of a medium-sized team that employed agile methodologies. Within this team, I worked on the development of 'Pecado Wallet,' a digital wallet that seamlessly integrates with web3 technology. My responsibilities included crafting features and tokens within the web3 environment, utilizing Solidity for the backend logic and Next.js for the frontend.
I served as the initial front-end developer tasked with modernizing an established application known as 'Pergamon Labs,' specializing in label and blueprint production for various products. In this capacity, I successfully migrated the application to Next.js while maintaining the existing PHP backend and integrating localization with Next-i18. Moreover, I'm proud to mention that due to my contributions and performance, the company has plans to promote me to the position of Senior Front-End Developer after six months. In this elevated role, I will be responsible for leading a team of frontend developers, further advancing my career and responsibilities within the organization.
As a full-stack developer, I was responsible for crafting a website known as 'Recdeer,' which drew inspiration from Senja.io. This endeavor involved the utilization of React for the front-end and Ruby on Rails for the back-end.
I served as a freelance developer for Matthew Bender at Ironfence Company. My responsibilities included transforming an existing static website, originally built with vanilla JavaScript and jQuery, into a dynamic Next.js application with a PHP backend. Additionally, I developed a content management system (CMS) web application and a mobile application for the Disconnector Golf app, where PHP served as the backend technology.
As a Front-End Developer, I specialize in using React, React Native, and Angular. I have been deployed on various projects including LMX, Misorobotics, Memachat app, Playfriends, and Lexi. Additionally, I am also involved in Solidity research and development.
I completed diverse tasks for Agoda, demonstrating creativity and meticulous attention to detail. Additionally, I contributed to WordPress website development and maintenance, showcasing proficiency in the platform. I also successfully developed EquitySwarm using React, highlighting my expertise in front-end development and commitment to delivering exceptional user experiences.
I provided assistance in maintaining and enhancing a real estate business website built in REX CMS, ensuring optimal user experience and smooth operation. Additionally, I developed the Hodge Social website, demonstrating my proficiency in web development and delivering an engaging online presence.
I independently expanded and improved an existing project using Next.js, ensuring smooth transitions and development. I addressed issues on both the admin and client sides, enhancing functionality and user satisfaction. Additionally, I utilized Prisma for efficient backend operations and spearheaded a comprehensive app redesign that prioritized creativity and intuitive UX/UI principles.
I am building a social bartering system using React Native, showcasing my expertise in mobile app development. The system utilizes Firebase for efficient and reliable data management, while Agile methodology is implemented to drive iterative progress and continuous improvement. Working within a fast-paced team environment, I am focused on delivering the social bartering system effectively.
As the sole React Native Developer in the Research and Development team, I maintained a well-structured and clean codebase, adhering to standardized functions and design principles. I facilitated collaboration and ensured consistent quality in mobile development within the organization, integrating mobile APIs for seamless connectivity and creating comprehensive documentation for knowledge transfer and reference.
As a Full Stack Developer Intern, I actively contributed to a Research and Development team, focusing on building a robust web portal with seamless integration to a dynamic database. I also designed and developed a React Native mobile app with unique features for improved usability. Throughout my internship, I emphasized the importance of comprehensive documentation to support the company's future endeavors.