const developer = { name: 'John', skills: ['Angular', 'React', 'TypeScript'] };
function buildApp() { return 'scalable solutions'; }
import { Component } from '@angular/core';
export class Hero implements OnInit {
this.experience = '10+ years';
async getData(): Promise<void> {
Observable.pipe(map(data => data.projects))
interface Developer { skills: string[]; }
const frameworks = ['Angular', 'Vue', 'React'];
npm install @angular/core --save

Do you want to hire a

Senior Angular Developer?

Building scalable, reliable, and maintainable front-end applications.

Let's work together to turn complex business needs into elegant user interfaces.

📩 Let's Talk 📄 View Portfolio

About Me

Hi, I'm John Kowalski111 – a Senior Front-End Developer specializing in Angular and modern web technologies. Over the past 10+ years, I've worked with international corporations and growing tech companies to deliver clean, modular, and production-ready web applications.

My expertise lies in developing robust Single Page Applications, implementing Micro Frontend architectures, and building component-driven user interfaces that scale with product and team growth. I've worked on mission-critical dashboards for the medical industry, enterprise-level, data visualization tools, and modern low-code platforms.

I believe in writing maintainable code, collaborating with product teams, and continuously improving delivery processes. Whether I'm building something from scratch or joining an existing codebase, I bring structure, stability, and thoughtful execution to the table.

Services

Here's how I can support your project or team:

🔧

Angular Development

  • Building and scaling Angular apps (v2 – 15+)
  • SPA architecture & routing
  • RxJS, NgRx state management
🏗️

Frontend Architecture

  • Micro Frontends (Module Federation)
  • Monorepos with Nx
  • Component libraries & reusable UI systems
🎯

Product-Focused Development

  • Translating business needs into intuitive UX/UI
  • Dashboard development & data visualization
  • Performance tuning and accessibility
🤝

Team Support

  • Code reviews & mentorship
  • Documentation & knowledge sharing
  • Integration with agile delivery teams

Portfolio

Here are some of the key projects I've contributed to:

Roche – Medical Data Interfaces

Role: Angular Developer

Worked on enterprise dashboards for healthcare professionals. Focused on complex state management using NgRx and integration with Node.js APIs.

Angular 7–12 NgRx TypeScript Node.js

87percent.co.uk – Mental Well-being Platform

Role: Front-End Developer

Contributed to the development of interactive surveys, personalized reporting dashboards, and UX improvements for a web-based well-being platform.

JavaScript AngularJS Node.js

SimplyGoLive – Low-code Website Builder

Role: JavaScript Developer

Built dynamic UI components for a Webflow-like page editor using AngularJS, Vue, Polymer, and React. Focused on flexibility, drag-and-drop UX, and cross-framework architecture.

AngularJS Vue.js React Polymer

Testimonials

John has been a key part of our front-end team. His Angular expertise, attention to detail, and architectural thinking have made a huge impact on the project.
— Team Lead, PwC
A calm, focused developer who consistently delivers clean and reliable code. John is also a great team player and mentor to junior devs.
— Scrum Master, Roche
From prototype to production, John helped us turn ideas into a stable front-end. His technical versatility across frameworks was a game changer.
— CTO, SimplyGoLive

Tech Stack

🚀 Front-End Frameworks

Angular 2–15+, AngularJS, Vue.js, React, Polymer

🔄 State & Architecture

RxJS, NgRx, Module Federation, Monorepos (Nx), SPA Routing

🎨 UI/UX Tools

SCSS, CSS3, HTML5, Storybook, Responsive Design

⚙️ Tooling & DevOps

Webpack, Gulp, Grunt, Git, CI/CD workflows

🔗 Back-End & API Integration

Node.js, REST APIs, JWT auth, data visualization

🧠 Methodologies

Agile (Scrum), TDD (Jasmine, Karma), Code Reviews, Clean Code, SOLID

Contact

Looking for a Senior Front-End Developer to join your team or contribute to your product?

Let's talk! I'm open to:

  • Long-term contract roles (B2B, remote)
  • Permanent positions in stable engineering teams
  • Collaborations on high-quality front-end projects

🔗 LinkedIn

linkedin.com/in/johnkowalski

🌍 Location

Remote (based in Poland)