Abu Sayed - Frontend Developer

About

Hi, I'm Abu Sayed — a Frontend Developer with 4+ years of experience building modern, scalable, and user-friendly web applications. I specialize in React, Next.js, and JavaScript, with strong skills in building responsive interfaces and delivering seamless user experiences.

Over the past few years, I have worked as a Front-End Developer at Spekter GmbH, where I built and optimized complex UI components, integrated advanced features, and ensured cross-device responsiveness using React, Next.js, and Tailwind CSS. I've worked on scalable web applications with focus on performance and user experience, including implementing intricate UI components and interactive map functionalities.

While I'm primarily focused on frontend development, I'm actively expanding my backend knowledge and working with Node.js, Express, and MongoDB. I'm building full-stack projects to strengthen my backend skills and become a more well-rounded developer. I'm currently preparing for Frontend Software Engineer (Level 2) positions, with expertise in modern frontend stacks (React, Next.js, React Native, TypeScript, REST APIs, and testing frameworks).

Experience

Sep 2021 - Apr 2025

Front-End Developer

Spekter GmbH•Full-time

Herzogenaurach, Bavaria, Germany • Remote

Built interactive map-based UI with React, OpenLayers, and Mapbox, handling multiple layers, sensor data, weather radar, and predictive analytics with smooth performance. ( https://www.spekter.de )
Developed responsive, reusable components using Tailwind CSS and Recharts for visualizing complex datasets.
Implemented real-time macOS-style notifications, ensuring fast, lag-free updates.
Built a JIRA-style drag-and-drop issue board for an internal sensor and task management tool.

ReactNext.jsTypeScriptTailwind CSSJavaScriptOpenLayersMapboxRechartsGit

Feb 2021 - May 2021

Software Developer

ResoluteAI.in•Internship

Bangalore Urban, Karnataka, India

Worked on FaceGenie, a face-detection attendance app for offices, schools, universities, and factories, providing analytics on presence, late arrivals, and location-based activity. ( https://resoluteaisoftware.in/facegenie )
Built React frontend with Material-UI, creating responsive, real-time monitoring interfaces.
Integrated Firebase Realtime Database and experimented with Node.js/MongoDB for local server handling.

JavaScriptReactMaterial-UIFirebaseNode.jsMongoDBGitAgile

Projects

Service Booking System

A full-stack service booking platform that allows users to book appointments with service providers such as salons, dental clinics, and beauty parlors. Features multi-role authentication, staff-based scheduling, real-time availability checking, comprehensive booking management, and admin dashboard with analytics.

Next.js 15React 19TypeScriptTailwind CSSNode.jsExpress.jsMongoDBMongooseJWTSwaggerZustandReact Hook FormTanStack QueryShadcn/uiRadix UI

Code Live Demo

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Lithos Bike E-commerce Platform

A full-stack e-commerce platform for premium mountain bikes featuring product catalog, user authentication, warranty management system, and comprehensive product specifications with geometry data for cycling enthusiasts.

Next.js 15React 19TypeScriptTailwind CSSMongoDBMongooseNextAuth.jsJWTbcryptjsFramer MotionShadcn/uiRadix UIReact Hook FormZodReact Markdown

Live Demo

View Details

Skills & Technologies

Frontend (Primary Focus)

ReactNext.jsTypeScriptTailwind CSSJavaScriptHTML/CSSResponsive DesignUI/UX

Backend (Growing)

Node.jsExpress.jsMongoDBREST APIsAuthenticationDatabase Design

Tools & Platforms

GitGitHubVercelNetlifyDocker (learning)Postman

Additional Technologies

Socket.IOJWTSwaggerTestingPerformance OptimizationWeb Accessibility