Hire the Best d3.js Developers
in Croatia

⭐⭐⭐⭐⭐"Igor was fantastic. He was very communicative, great work ethic and extremely experienced. I'm a developer and lead a team of more than 30 software engineers and Igor's work was top notch. I will certainly hire him again!" Josh Miramant, Blue Orange Digital I am a front-end developer who specializes in data visualization using d3.js, vector graphics, interactives, and animation. I have experience throughout the entire scope of web projects and have designed UI/UX, assets, templates, and projects. I have analyzed, cleaned, and converted data and worked with databases and APIs. Embracing web experiences outside of the front-end has helped me develop original, concise, and effective interfaces.

I help startups and SaaS teams design and build fast, beautiful, and scalable frontend applications. With 10+ years of experience, I’ve worked on everything from complex dashboards to high performance design systems always delivering with a mix of technical depth and product intuition. ✅ Client Feedback Says It All: “Nik is the best coder I’ve hired on Upwork.” “Top notch! He’s a proactive, goal oriented, and skillful developer.” “Nik delivered clean, beautiful code and improved things I hadn’t even thought of.” “He doesn’t just code, he helps guide the product with expert advice.” 🔧 Core Tech Stack: Frontend: Vue 3, React, Angular, RxJS, NgRx, TypeScript UI/UX: TailwindCSS, Material UI, Element Plus, Bootstrap Data Visualization: Chart.js, D3.js, Three.js APIs & Backend: REST, GraphQL, Node.js, Express Full-Stack: MEVN / MERN / MEAN 🧠 I specialize in: Building modern dashboards, admin panels, and data heavy apps Designing reusable component libraries and design systems Migrating legacy apps to Vue, React, or Angular Improving app speed, structure, and developer handoff ⚡️ What clients love about working with me: Clear, fast communication Proactive suggestions and clean architecture Zero micromanagement, just reliable delivery Always focused on performance, maintainability, and UX Let’s connect if you need a frontend expert who’s not only senior in skill, but senior in attitude, calm, communicative, and committed to outcomes.

'Got a Few Seconds?' version: Most developers can code. Most automation specialists can build workflows. Very few can do both, and even fewer understand the business problem behind the request. That's exactly where I operate. I'm Mate, and for the past 3 years I've helped small businesses and growing companies build systems that actually fit how they work. With 30+ automation workflows in production and hands-on experience across major SaaS projects, my clients save 7+ hours every week on average. 'Grab a Coffee' version: Most developers can write clean code. Most automation specialists can build a solid workflow. But there's a gap between the two, and it's where most projects quietly fail. A developer who doesn't understand your business builds the wrong thing fast. An automation specialist who can't code hits a ceiling the moment things get complex. I sit in that gap intentionally. After 3 years building full-stack products and automation systems across different industries, I've found that the most valuable thing I bring to a project isn't a specific technology but being able to look at how your business runs, identify where the friction is, and build something that removes it. Whether that's a connected web platform, an automated workflow that eliminates manual work, or a full product from idea to launch. This is services I offer: Automation That Pays for Itself Manual processes are quietly expensive. I design and implement automation workflows that eliminate repetitive work, syncing your tools, routing your data, and handling the back-and-forth that eats up your team's time. With 30+ workflows currently running in production for my clients, the average result is 7+ hours saved per week, per client. Some save significantly more... Frontend & Full-Stack Development For companies that need a reliable development partner, I build clean, scalable interfaces and full-stack products using React, Next.js, and TypeScript. I've worked on large SaaS projects where performance and maintainability aren't optional and I bring that same standard to every engagement. Web Presence That Works For smaller businesses, a website isn't just a brochure. I build sites that are connected to the systems behind them with forms that trigger workflows, inquiry processes that run themselves, and integrations that mean you spend less time managing and more time delivering. The thread that connects all of it: I think like a business owner first, and a developer second. Technologies I work with: React, Next.js, TypeScript, Node.js, SQL, n8n, Make, Zapier, Google API-s. Ready to talk? Send me a message with what you're working on and let's figure out the best path forward.

Hi , There, I am a full-stack web developer with experience in building web applications and sites. I use modern tech in my stack and review my old code to see if it could be improved with either new technology, a different solution, or be reused on new projects. I value quality before everything else because it is the most critical factor of a strategic success I am specialized in building websites and applications using JavaScript and related technologies, like React, Next. Frontend: - ReactJS, NextJS - HTML5, CSS3, Bootstrap, SCSS, FabricJS, ChartJS, D3JS, gsap Backend: - NodeJS, Express - Python - Laravel, PHP Others: -Woocommerce Looking forward to working with you in the long term. Cheers.

As a Senior Full-Stack GIS Engineer, I build end-to-end solutions for mapping and large-scale geospatial systems. I also run Mappinest, a SaaS platform focused on cost-optimized map infrastructure. My work centers on delivering reliable, well-designed systems with clean, efficient code, backed by hands-on experience and an MSc in GIS & Geography. I enjoy solving complex problems and collaborating closely with clients to turn geospatial requirements into scalable, maintainable product features. Staying up to date with modern web and GIS technologies allows me to choose the right mix of open-source and commercial tools based on project requirements and long-term goals. 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐓𝐨𝐨𝐥𝐬 • React, Next.js, TypeScript, Tailwind CSS, Styled Components, Canvas API, Redux, WebSockets, Expo, Jest 𝐌𝐚𝐩𝐩𝐢𝐧𝐠 𝐋𝐢𝐛𝐫𝐚𝐫𝐢𝐞𝐬 𝐚𝐧𝐝 𝐓𝐨𝐨𝐥𝐬 • Mapbox, MapLibre, Turf.js, Leaflet.js, Routing APIs, Google Maps API, ArcGIS SDK, OpenLayers, Cesium, deck.gl, Maputnik, GDAL, TileServer GL, Tippecanoe 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 • Node.js, Express.js, Jest, LLM integration and MCP APIs • Python/Django (intermediate) 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 • PostgreSQL(PostGIS), MongoDB, MySQL, Snowflake, Prisma ORM 𝐃𝐞𝐯𝐎𝐩𝐬, 𝐂𝐥𝐨𝐮𝐝 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 • Cloud: AWS (EC2, S3, CDN, SQS), Vercel, Heroku, Netlify, Render • Infra & CI/CD : Docker, Redis, NGINX, CI/CD Pipelines 𝐕𝐞𝐫𝐬𝐢𝐨𝐧 𝐂𝐨𝐧𝐭𝐫𝐨𝐥 • Git, GitHub, GitLab 𝐃𝐞𝐬𝐤𝐭𝐨𝐩 𝐒𝐭𝐚𝐜𝐤 • QGIS, ArcGIS Pro • Adobe Photoshop and Illustrator (intermediate) 𝐀𝐫𝐞𝐚𝐬 𝐨𝐟 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 • Design systems & component-driven React development with UI/UX, Agile workflows • End-to-end interactive map & GIS application development • Self-hosted basemaps, vector & raster tile pipelines • Navigation & live-tracking & routing map features • Thematic & topographic map design • High-accuracy geocoding & spatial analysis • Geospatial formats: GeoJSON, 3D-Tiles, PMTiles, MBTiles, KML, TopoJSON, Shapefile, GeoTIFF, WKT... • OSM and Census data integration • 2D / 3D map animations and storytelling I believe that quality is the key to a job well done. I always try to work as quickly as possible and efficiently. With that said, I can state I give my best to make my clients happy.🤝