Hire the Best React.js Developers
in Finland

I help startups and growing businesses improve their existing platforms by integrating AI and building internal automation systems. As a full-stack engineer, I work across frontend, backend, and infrastructure. My focus is on building structured, scalable systems not just isolated features. I typically work on: • Integrating AI (OpenAI / ChatGPT APIs) into existing web platforms • Building AI-powered assistants inside SaaS dashboards • Automating internal workflows and business processes • Developing custom admin panels and internal tools • Designing backend systems with secure role-based access • Building REST APIs and third-party integrations • Deploying applications to production with proper structure I build products end-to-end from architecture design and database modeling to frontend implementation, AI integration, and deployment. My goal is to help businesses reduce manual work, improve efficiency, and add intelligent features that create measurable value. If you already have a system and want to integrate AI, automate workflows, or build a scalable SaaS product from scratch, I can help you design and implement it properly.

𝐌𝐨𝐬𝐭 𝐟𝐨𝐮𝐧𝐝𝐞𝐫𝐬 𝐥𝐨𝐬𝐞 𝐦𝐨𝐧𝐭𝐡𝐬 𝐨𝐟 𝐫𝐮𝐧𝐰𝐚𝐲 𝐟𝐢𝐱𝐢𝐧𝐠 '𝐜𝐡𝐞𝐚𝐩' 𝐜𝐨𝐝𝐞. 𝐈 𝐡𝐞𝐥𝐩 𝐲𝐨𝐮 𝐬𝐤𝐢𝐩 𝐭𝐡𝐚𝐭 𝐩𝐡𝐚𝐬𝐞 𝐛𝐲 𝐛𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐫𝐞𝐚𝐝𝐲 𝐒𝐚𝐚𝐒 𝐢𝐧𝐭𝐞𝐫𝐟𝐚𝐜𝐞𝐬 𝐭𝐡𝐚𝐭 𝐜𝐨𝐦𝐛𝐢𝐧𝐞 𝐩𝐢𝐱𝐞𝐥-𝐩𝐞𝐫𝐟𝐞𝐜𝐭 𝐝𝐞𝐬𝐢𝐠𝐧 𝐰𝐢𝐭𝐡 𝐚 𝐫𝐨𝐜𝐤-𝐬𝐨𝐥𝐢𝐝 𝐍𝐞𝐱𝐭 & 𝐃𝐣𝐚𝐧𝐠𝐨 𝐚𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞. 𝐈 𝐝𝐨𝐧'𝐭 𝐣𝐮𝐬𝐭 𝐰𝐫𝐢𝐭𝐞 𝐜𝐨𝐝𝐞; 𝐈 𝐦𝐚𝐤𝐞 𝐚𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐚𝐥 𝐝𝐞𝐜𝐢𝐬𝐢𝐨𝐧𝐬 𝐭𝐡𝐚𝐭 𝐬𝐜𝐚𝐥𝐞. With 8+ years of experience, I specialize in delivering high-performance web applications, custom SaaS apps, and Business-ready systems for Startups and Small Medium medium-sized businesses. I will help transform your concepts into smooth web and mobile platforms that stand out! 💡 𝐖𝐡𝐨 𝐀𝐦 𝐈? I am an experienced skilled 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 with proven expertise in: - Building cloud-native applications. - Optimizing legacy systems. - Developing advanced AI solutions. With successful collaborations on projects like 𝐒haremundo Links, Knowlej, Clue, Saber AI, Circle2Learn, and others, I have delivered impactful results across industries, including SaaS Apps, EdTech, FinTech, Healthcare, eCommerce, and more. 🛠️ 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 & 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 📊 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: React, Next.js, TypeScript, SCSS, Angular 20/21 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: Node, Express, Nest, Python, Django, Fast API, RESTful APIs, GraphQL, WebSockets Databases: MySQL, PostgreSQL, MongoDB, DynamoDB ☁️ 𝐂𝐥𝐨𝐮𝐝 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 - AWS, Azure - Serverless Architectures: AWS Lambda, Azure Functions - Microservices Development 🤖 𝐀𝐈 & 𝐂𝐡𝐚𝐭𝐛𝐨𝐭 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 OpenAI, Llama, Claude ✨ 𝐖𝐡𝐲 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞? Over the years, I have successfully delivered 𝟐5+ 𝐥𝐚𝐫𝐠𝐞-𝐬𝐜𝐚𝐥𝐞 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 for over 55+ 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 across diverse industries: 📊 𝐌𝐲 𝐈𝐦𝐩𝐚𝐜𝐭 𝐚𝐬 𝐚 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 1. 𝟒𝟎% 𝐂𝐨𝐬𝐭 𝐑𝐞𝐝𝐮𝐜𝐭𝐢𝐨𝐧: Implemented serverless architecture to enhance scalability and reduce infrastructure costs for SaaS platforms. 2. 𝟓𝟎% 𝐅𝐚𝐬𝐭𝐞𝐫 𝐀𝐏𝐈𝐬: Optimized back-end performance for high-traffic enterprise applications, improving response times and user experience. 3. 𝟑𝟓% 𝐁𝐞𝐭𝐭𝐞𝐫 𝐄𝐧𝐠𝐚𝐠𝐞𝐦𝐞𝐧𝐭: Integrated OpenAI-powered AI chatbots, automating customer support and boosting customer interactions. 4. 𝐋𝐞𝐠𝐚𝐜𝐲 𝐌𝐨𝐝𝐞𝐫𝐧𝐢𝐳𝐚𝐭𝐢𝐨𝐧: Transformed outdated, monolithic systems into scalable, cloud-native solutions using modern technologies. 5. By combining full-stack expertise, cloud-native strategies, and AI integrations, I deliver impactful solutions that drive measurable business growth. 📊 𝐂𝐥𝐢𝐞𝐧𝐭 𝐓𝐞𝐬𝐭𝐢𝐦𝐨𝐧𝐢𝐚𝐥𝐬 1. “Adeel optimized our backend and reduced load times by 60%. He takes pride in delivering the best solution for his clients.” 2. “Adeel is highly skilled in both front-end and back-end technologies. Working with him is smooth and productive.” 📈 𝐑𝐞𝐚𝐝𝐲 𝐭𝐨 𝐆𝐫𝐨𝐰 𝐘𝐨𝐮𝐫 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬? I specialize in creating scalable, efficient, and innovative solutions according to your business needs. Whether you’re building a new system, updating a legacy platform, or integrating AI-powered tools, I’m here to help you achieve success. 👉 Click the “𝐈𝐧𝐯𝐢𝐭𝐞” button and let’s start building something amazing together! 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀 𝘁𝗼 𝗙𝗶𝗻𝗱 𝗺𝗲 𝗼𝗻 𝗨𝗽𝘄𝗼𝗿𝗸: Full Stack Developer, React Developer, Next Developer, Node.js Developer, React Native Developer, MERN Stack Developer, JavaScript Developer, TypeScript Developer, AI Engineer, AI Developer, Chatbot Developer, LLM Developer, LangChain Developer, OpenAI Developer, Web Application Developer, Mobile App Developer, SaaS Developer, eCommerce Developer, Stripe Integration, Payment Gateway Integration, API Developer, GraphQL Developer, REST API Developer, Headless CMS Developer, Firebase Developer, Supabase Developer, AWS Developer, Docker Developer, CI/CD Engineer, DevOps Engineer, Cloud Application Developer, Performance Optimization, SEO Optimization, UI/UX Developer, Healthcare Software Developer, FinTech Developer, EdTech Developer, Aviation Software Developer, eCommerce Platform Developer, Stock Trading App Developer, Agriculture Tech Developer, Hospitality Platform Developer, Transport and Logistics App Developer, Social Media Platform Developer, Startup Developer, Dashboard Developer, Data Visualization Developer

Senior Full-Stack Developer with 5+ years of commercial experience specializing in crafting high-performance, pixel-perfect, and highly interactive web applications using React, Next.js, and TypeScript. I combine an eye for exceptional UI/UX with a strong technical edge—the ability to seamlessly integrate front-end interfaces with complex AI APIs, real-time data streams, and asynchronous backends. My core expertise lies in transforming rich data, sophisticated dashboards, and intricate automation workflows into responsive, lightning-fast user experiences. Whether building an AI-powered SaaS application, managing complex application states, or optimizing high-load platforms, I deliver clean, maintainable, and well-documented code. 🚀 Core Engineering Expertise: Advanced Frontend Ecosystem: Building scalable Single Page Applications (SPA) and Server-Side Rendered (SSR) apps using React.js, Next.js, and TypeScript. Expert-level state management via Redux Toolkit, RTK Query, Redux-Saga, and MobX. AI Integration & Automation: Developing intelligent user interfaces and web tools powered by OpenAI and Anthropic APIs. Experienced in building multi-source data extraction pipelines using Playwright. Robust Asynchronous Backend: Architecting secure, real-time RESTful APIs and microservices using Python (FastAPI, Flask) and Java (Spring Boot with Hibernate). Real-Time Data & Mapping: Implementing instant client-server communication using WebSockets, Server-Sent Events (SSE), Integrating advanced mapping tools like Google Maps API, Mapbox, and Leaflet. Data Architecture & Performance: Designing and optimizing relational and NoSQL databases (PostgreSQL, MySQL, MongoDB, Redis). Optimizing large-scale systems, including platforms serving 15M+ dynamic pages with Elasticsearch. 💼 Highlighted Production Experience: AI-Powered Sales Intelligence Platform: Built the full-stack infrastructure for a B2B platform. Developed automated web scraping (Playwright), PDF parsing pipelines, data processing (Pandas), and direct API synchronization with Salesforce and HubSpot CRMs. AI Website Builder (1 Year): Engineered end-to-end full-stack functionality for an automated design generation SaaS. Integrated OpenAI/Anthropic APIs, managed custom domain services, and secured payment flows via Stripe. High-Load Corporate Data Portal: Developed the frontend and maintained the scalable backend architecture serving 15+ million dynamic pages of business profiles with deep Elasticsearch indexing and advanced filtering. 🛠️ Technical Skills & Keywords (SEO Cloud) FRONTEND & STATE MANAGEMENT: React, React.js, Next.js, NextJS, TypeScript, JavaScript (ES6+), Redux, Redux Toolkit, RTK Query, Redux Thunk, Redux-Saga, MobX, Axios, HTML5, CSS3, LESS, Sass, Web Accessibility (WCAG). UI LIBRARIES & ANIMATION: Tailwind CSS, Material UI (MUI), Bootstrap, Framer Motion, Responsive Web Design, Component-Driven Development. BACKEND & MICROSERVICES: Python, FastAPI, Flask, Java, Spring Boot, Hibernate, Node.js, RESTful API Development, Microservices Architecture, Event-Driven Architecture, Celery, Pydantic, SQLAlchemy, Alembic. AI, ML & DATA AUTOMATION: OpenAI API, Anthropic API, ChatGPT Integration, LLM Tools, LangChain, Playwright, Web Scraping, Data Ingestion, pypdf, Pandas, NumPy, NLTK (Natural Language Toolkit), Jinja2, SMTP. DATABASES, CACHING & SEARCH: PostgreSQL, MySQL, RDBMS, MongoDB, NoSQL, Redis (Caching/Session Management), Elasticsearch (Advanced Search & Indexing). REAL-TIME & GEOSPATIAL: WebSockets, SSE (Server-Sent Events), Google Maps API, React Google Maps, Mapbox, Leaflet, React Leaflet, Geolocation Services. CLOUD, DEVOPS & INTEGRATIONS: AWS (Amazon Web Services), AWS Certified Cloud Practitioner, Docker, Containerization, GitHub Actions, GitHub CI/CD, Sentry (Error Tracking), Auth0, JWT, Stripe Payment Gateway, Salesforce API, HubSpot API, Git, GitHub, GitLab, Postman, Jest, React Testing Library. I hold a Master's degree, an AWS Cloud Practitioner certification, and maintain Advanced English (C1) fluency. I am completely comfortable collaborating in fast-paced, agile/scrum environments. Let's connect to turn your product vision into a robust, beautifully-engineered reality!

I build software that outlives the reason it was written. One product my team and I helped build from day one is now a company valued at $850M. The less flashy proof is that clients keep me: several engagements have run two and three years, and most clients come back. I'm a senior full-stack and AI developer and the founder of Emphasoft. 189 projects, 25,900+ hours and $1M+ delivered on Upwork, at 100% Job Success. Clients often come to me after someone else has already failed. One had gone through a freelancer and two agencies before we finished the platform. Another wrote that we completed a project where others could not. That's the work I'm best at. There are two ways people work with me. I build it. You have an idea, or a product that needs a new capability. I own architecture and delivery, my senior team builds it, and you deal with one person the whole way through. I augment your team. You have a product and not enough engineers. I give you a senior developer, or a small team, working full-time inside your codebase, from people already on my bench, usually starting within days. They stay: my longest engagements have run over three years with the same engineers on the same product. Onboarding, continuity and technical direction are my problem, not yours. Either way, I'm accountable for the outcome. What I build: ✅ MVPs and new products — built to scale, not to be rewritten ✅ SaaS platforms and complex web applications ✅ API development and third-party integrations ✅ Dedicated engineers and teams, full-time, long-term ✅ AI features inside products that already exist ✅ Mobile apps (Flutter, React Native, iOS, Android) AI work I deliver: ✅ AI agents and agentic workflows ✅ Workflow automation — n8n, API orchestration, internal tooling ✅ Support bots trained on your own data, answering in your team's voice ✅ Document and invoice processing at scale — OCR and LLM extraction ✅ LLM integration into existing platforms — Claude, OpenAI, self-hosted models Stack: ✅ Back-end: Python (Django, FastAPI, Flask), Node.js ✅ Front-end: React, Next.js, TypeScript ✅ Infrastructure: Amazon Web Services (AWS), DevOps, PostgreSQL, Supabase ✅ Mobile: Flutter, React Native, Capacitor.js Not a fit for: one-off fixes in legacy code, crypto projects, or work where the deciding factor is the lowest hourly rate. Tell me what you're building and where it's stuck.

Main area of expertise: - JavaScript/TypeScript - React/Next.js - Node.js/Nest.js - HTML/CSS/SCSS/Tailwind - Git Worked in both small and large projects, in distributed teams as well as more solo, bootstrapped and helped bootstrapped small to medium sized projects, in my career I worked on platforms such as: - Lending platform for one of the biggest tech retailers in Romania - Data migration software used by corporate giants such as Volkswagen and E.ON - Emerging Web3 art auction platform using Solana - Rental properties management platform Other competencies: - GraphQL, SQL, C#, .NET, WordPress, PHP, Web3/NFTs, Web Animations, Storybooks, MongoDB, Jest, Puppeteer

Your Success is My Priority That's me, Irteza! I am a software engineer with 4 years of experience in React, Angular, Node.js, Express.js, MySQL, MongoDB, and AWS. I develop both frontend and backend solutions, delivering accurate and effective results in fast-paced environments. |🛠️| Some of my skills |🛠️| ✅ Frontend Frameworks : React.js, Angular.js ✅ Styling : Material UI, Tailwind CSS, Bootstrap, Semantic UI,Styled Components ✅ CSS Preprocessors : SCSS, SASS, LESS ✅ Backend Technologies : Node.js, Express, Nest.js ✅ Databases : MongoDB, PostgreSQL, MySQL, MariaDB, DynamoDB, S3 ✅ Query Languages : GraphQL ✅ Cloud Platforms : AWS, Firebase ✅ Testing : Mocha Chai ✅ State Management : Redux, Nginx ✅ Version Control : Git Why Choose Me? ✅ Expertise in React and Node JS development ✅ Best practices in web development ✅ High-quality, clean code ✅ Responsive design ✅ 24/7 Availability 🤝 Let's collaborate. Whether for projects, consultations, or a friendly chat, feel free to get in touch! Thanks, Irteza hammad