Open to Full-Time and Contract Roles

Hi, I'm Viktor Nyari

Full-Stack Developer Based in London

I design and build fast, reliable products for fintech, health and AI. Ten years of building for the web, from patient booking at Zocdoc to the investing app I work on today at EC Markets.

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Viktor Nyari
EC Markets app icon
Currently
Senior Web Developer, EC Markets

Built Products for Teams at

  • Revolut
  • Freetrade
  • Zocdoc
  • AstraZeneca
  • Novartis
  • Regeneron
  • ASOS

Selected Work

Case Studies

Three products I've helped build: a consumer investing app, a regulatory platform for pharma, and an industrial CRM built end to end.

EC Markets product mockup

Fintech · 2026 · Current role

EC Markets

An FCA-regulated investing app for UK stocks, ETFs, ISAs and SIPPs, live on iOS and Android since September 2026. I ship across the React Native app, the Java backend and the website.

  • 155 merged pull requests across the React Native app, the Java backend and the AWS infrastructure.
  • Trading flows on the order ticket and positions, kept in sync with TraderEvolution.
  • The messaging platform: Novu workflows for onboarding, funding, document expiry and CRM email.
  • TypeScript
  • React Native
  • Expo
  • Java
  • Spring Boot
  • PostgreSQL
  • AWS
  • Terraform
Read Case Study App Store
CoLab Portal product mockup

Health · Regulatory · BoldApprovals

CoLab Portal

A secure collaboration portal for pharma teams preparing for FDA Advisory Committee meetings. Every question, response, responder and supporting slide sits in one view.

  • React interfaces for the Q&A framework: slides, messages, issues and questions.
  • Card layouts that keep dense clinical slides readable at a glance, with status beside each one.
  • Client-facing and marketing features around the portal.
  • React
  • JavaScript
  • REST APIs
Read Case Study BoldApprovals Tools
GF Recycling CRM product mockup

Full stack · Industrial · General Future

GF Recycling CRM

A procurement CRM and site ERP for an e-waste and metals recycler. It finds and scores suppliers, prices material against the LME, and plans the sales team's day in the field.

  • The whole product: a Node and Express API behind nginx, and an installable PWA for field reps.
  • Lead scoring that combines deal value with a GPT-4o conversion estimate, run as batch jobs streamed to the UI over Server-Sent Events.
  • Weekly price lists generated from synced LME metal prices and smelter contracts.
  • Node.js
  • Express
  • JavaScript
  • OpenAI API
  • Leaflet
  • PWA
  • nginx
Read Case Study Ask for a Demo

Also Shipped

More Client Work

Experience

Where I've Worked

Ten years of building for the web, from Budapest agencies to London fintech.

  1. 2026 – Present

    Senior Web Developer

    EC Markets · London

    Work across the React Native app, the Java backend and the website for an FCA-regulated investing app, and own the notifications platform and mobile attribution.

  2. 2022 – 2026

    Full-Stack Web Developer

    BoldScience · London

    Led architecture across client projects and built the AdComm preparation tools for BoldApprovals, plus touch kiosks and data dashboards for scientific conferences.

    Clients: AstraZeneca, Novartis, Regeneron, AbbVie, Daiichi Sankyo

  3. 2020 – 2022

    Full-Stack Developer

    Engage Hub · London

    Built web apps, dashboards and Shopify storefronts across 15+ concurrent client projects, and a shared component library and design system.

    Clients: ASOS, H&M, Revolut, Gorillas, BlanX

  4. 2020

    Creative Developer

    GumGum · London

    Interactive ad experiences and microsites in JavaScript and HTML5 Canvas, raising campaign click-through by 22%.

    Clients: Coca-Cola, Nike, GoPro, Mercedes-Benz, Spotify

  5. 2016 – 2019

    Web Developer

    Yellow Bird and Drive Online Marketing · Budapest

    Designed and built 100+ pages across 20+ WordPress sites with custom PHP themes, and led full redesigns.

Skills

What I Work With

Languages

  • TypeScript
  • JavaScript
  • Java
  • PHP
  • HTML
  • CSS

Front End

  • React
  • React Native
  • Next.js
  • Vue
  • Preact
  • Tailwind CSS
  • Framer Motion
  • Storybook

Back End & Data

  • Node.js
  • Express
  • Java
  • Spring Boot
  • PostgreSQL
  • MongoDB
  • REST APIs
  • Server-Sent Events

AI

  • OpenAI API
  • Claude
  • Vercel AI SDK

Platforms

  • AWS
  • Terraform
  • Vercel
  • nginx
  • Shopify
  • Webflow
  • WordPress

Design

  • Figma
  • Design systems

Archive

Earlier Projects

E-commerce, marketing sites and product design.

Let's Build Something Together

Hiring for a front-end or full-stack role, or need a product built? Email is the quickest way to reach me.

hello@viktornyari.com LinkedIn