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Mateusz Miszczak

Experience

Experience

My growth across client websites, CMS-driven marketing pages and production fintech applications.

Frontend Engineer
Fintech Experience
CI/CD & Infrastructure
CMS & Landing Pages

Growth Timeline

2023
01

Freelance and commercial websites

I started by building responsive websites for clients and agencies, including a photographer's portfolio that scored 99/100 Performance and 100/100 SEO in Lighthouse despite an 80-image gallery and heavy animation, alongside marketing pages, interactive visualizations and data tools.

2025
02

Production fintech applications

I joined a production fintech team and, over time, took on increasingly complex features: trading interfaces, wallet views, withdrawal flows, admin systems, client onboarding and data synchronization through WebSockets.

2026
03

Broader scope and ownership

Over time my scope grew to owning larger areas end to end: multi-step business flows, realtime UI, CI/CD pipelines for a new project, frontend infrastructure in Terraform and AWS, unit tests on money-critical paths, and shared packages for the CMS-driven marketing applications.

Areas of responsibility

What I work on

Key areas I contributed to across the fintech product, the delivery and infrastructure behind it and CMS-driven web projects.

Product features

The core user-facing areas: trading interfaces with live asset data, withdrawal flows, tax document management, and admin systems covering the user lifecycle and client onboarding.

CI/CD and infrastructure

Work beyond the interface: CI/CD pipelines set up for a new project, frontend infrastructure defined in Terraform with AWS Amplify and SES, cache revalidation across applications, and shared frontend packages in the monorepo.

Marketing websites

Multilingual Next.js websites with CMS-driven content, responsive landing sections, reusable shared packages and production-ready delivery.

AI-assisted workflow

I use AI tools such as Claude and Codex daily: to explore approaches, scaffold implementations, refactor and debug faster. I review what comes out the same way I would review a colleague's pull request, and I make sure I understand anything I ship well enough to walk someone through it on a whiteboard.

Technical focus

Technical focus

Technologies and practices I use to build reliable, performant and scalable frontend applications.

Frontend
React
Next.js
TypeScript
State & Data
Redux Toolkit
React Query
GraphQL
REST
UI & Styling
Tailwind CSS
Framer Motion
Material UI
Figma
Realtime
WebSockets
State Sync
Forms
Zod
React Hook Form
Tooling
Turborepo
Strapi
Vitest
Web Quality
SEO
Accessibility
Core Web Vitals
Analytics
Responsive Design
Experience | Mateusz Miszczak