Available for select projects · 2026

Hey, I'm
Daniel Seiner.

I build

Software engineer based in Czechia with 8+ years shipping fast, considered, end-to-end products with React, Next.js and React Native.

Start a project

8+

Years building

40+

Projects shipped

25+

Happy clients

Daniel Seiner
✨ React · Next.js
🚀 TypeScript
What I do

Crafted with care, shipped with intent.

Eight+ years building and launching products end-to-end — from the first sketches to production deploys. Comfortable across web, mobile, and the tooling in between.

Core

Front-End Development

Dynamic, accessible interfaces with React, Next.js and TypeScript. Pixel-precise, responsive, and fast.

ReactNext.jsTypeScriptTailwindReact Query

Mobile App Development

Cross-platform apps with React Native and Expo — built for both iOS and Android with native polish.

React NativeExpoNativeWindiOSAndroid

Tooling & Best Practices

Modern workflow with Git, CI, code reviews, automated testing, and a strong eye for DX.

GitJestCypressESLintCI/CD
Selected work

Things I've shipped recently.

A handful of projects spanning logistics, healthcare, real estate, and AI tooling.

Komunita
Next.jsCommunitySocial

Komunita

Community platform connecting members around shared interests, events and discussions. Built with Next.js for a fast, social-first experience.

Tugedr
Next.jsCollaborationConvex

Tugedr

A modern collaboration product designed to bring people together around shared goals and projects. Crafted end-to-end with Next.js and convex.

Estone
Next.jsDesign SystemLogistics

Estone

A custom shipment-tracking and transport-purchasing platform built on a hand-crafted design system in Next.js.

Dobrý Anděl
ReactFormsNon-profit

Dobrý Anděl

Digitalising form-heavy charity workflows into a clean React web app for Good Angel.

Belveder Reality
Next.jsExpressReal Estate

Belveder Reality

Real-estate site connected to an external listings API. Built on Next.js + Express.

M2C
ReactCRMPermissions

M2C

A multi-role ticketing system in React with granular permissions and customised views per user type.

The journey so far

Work & education timeline.

A chronological overview of how I got here — and where I'm spending my time today.

  1. Jun 2025 — PresentNow

    Frontend Developer

    Lepshee s.r.o.

    Building production-grade frontends for high-traffic consumer applications, with a strong focus on performance, polish and maintainability.

    Remote

  2. Jun 2025 — Mar 2026

    Frontend Developer

    Edugym s.r.o.

    Built AI-powered ed-tech platforms and internal tooling alongside the product team — shipping features end-to-end in Next.js.

    Remote

  3. Mar 2024 — Apr 2024

    Mobile App Developer

    Datafriends s.r.o.

    Implemented features and ran QA for the StoreUp mobile app, built in React Native.

    Remote

  4. Sep 2023 — PresentNow

    Frontend Developer

    Abra a.s.

    Designing and maintaining the frontend for a portfolio of custom client products including EStone, Medimat and more.

    Remote

  5. Sep 2022 — PresentNow

    B.Sc. in Software Development

    Unicorn University

    Studying modern web technologies, distributed systems and core software engineering principles.

    Prague, CZ

  6. Aug 2022 — Aug 2023

    Frontend Developer

    Goodsailors s.r.o.

    Built responsive React applications and collaborated closely with designers on UI and UX improvements.

    Remote

  7. Oct 2021 — May 2022

    IT Support Internship

    DToms s.r.o.

    Hands-on training in IT support, infrastructure basics and small-scale development tasks.

    Ústí nad Labem, CZ

  8. Sep 2018 — May 2022

    High School Diploma in IT

    SPŠ Ústí nad Labem

    Studied programming, networking, databases and the fundamentals of software engineering.

    Ústí nad Labem, CZ