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About

Twenty years of building for the web, ten of them in enterprise React

Senior Frontend Engineer with 20 years of software development experience, specializing in enterprise applications built with React, Next.js, and TypeScript. I work across frontend architecture, design systems, performance optimization, accessibility, and technical leadership of teams of up to 10 engineers.

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Constantin Crismaru working at a laptop on a rooftop terrace at night, with a lit city skyline behind him.

How I work

Engineering principles

Four positions that shape how I approach a codebase, drawn from the work in the case studies.

  • Architecture is what lets a team keep moving

    Most frontend pain is structural: unclear boundaries, state in the wrong place, components that know too much. I spend my time on those boundaries — component and module structure, state strategy, data-fetching patterns — because that is what decides how the next twelve months of feature work will feel.

  • Accessibility is a functional requirement

    Keyboard operation, semantics and focus behaviour belong in the reusable components, not in a remediation pass at the end. Building them in once means every screen assembled from those components inherits the behaviour.

  • Measure, then optimize

    Code splitting, lazy loading and bundle work pay off when they are aimed at something real. On data-heavy dashboards and real-time streams, the interesting question is usually not "is this fast" but "what is this doing that it does not need to do yet".

  • Standards beat heroics

    Leading a team of 8-10 engineers taught me that shared standards, review habits and a documented component library outlast any individual contribution. Mentoring is part of the engineering work, not adjacent to it.

Toolkit

Skills by capability

React, TypeScript and Next.js are the specialization; Node.js and Python support it.

  • Frontend engineering

    The core stack used daily across enterprise product work.

    • React
    • Next.js
    • TypeScript
    • JavaScript ES6+
    • React Hooks
    • React Router
    • Redux
    • RxJS
    • HTML5
    • CSS3
    • Sass

  • Architecture and performance

    How applications are structured and kept fast as they grow.

    • Frontend architecture
    • Component architecture
    • Design systems
    • Storybook
    • Server-side rendering
    • Code splitting
    • Lazy loading
    • Rendering and bundle optimization
    • Accessibility and WCAG practices

  • Testing and quality

    Test tooling used to keep behavior verifiable during change.

    • Playwright
    • React Testing Library
    • Jest
    • Cypress

  • APIs and real-time integration

    Connecting interfaces to services, streams and AI workflows.

    • REST APIs
    • GraphQL
    • Apollo Client
    • WebRTC
    • Real-time event streams
    • Kafka
    • RabbitMQ

  • Backend and data

    Supporting full-stack capability alongside the frontend specialization.

    • Node.js
    • NestJS
    • Express.js
    • Python
    • FastAPI
    • PostgreSQL

  • Cloud and delivery

    Build, deployment and collaboration tooling.

    • Docker
    • AWS
    • Azure
    • Webpack
    • Git
    • GitLab
    • Agile
    • Scrum

Also worked with

  • Vue.js
  • Svelte
  • AngularJS
  • React Native
  • jQuery
  • Bootstrap
  • Sencha Touch
  • PHP
  • MySQL
  • .NET

Credentials

Education, certifications and languages

Education

  • MSc in Computer Science

    Alexandru Ioan Cuza University of Iasi

    Iasi, Romania

Certifications

  • AI 101: GL Certified AI Associate - Developers

    GlobalLogic

  • AWS Certified Developer - Associate

    Amazon Web Services2022

  • Cambridge English C1 Advanced

    Cambridge Assessment English2021

  • Generative AI

    GlobalLogic

  • Agentic AI with LangChain and Langflow

    GlobalLogic

Languages

Romanian
Native
English
C1 Advanced

About — Constantin Crismaru