Marius Mihail Ion

Frontend Developer | Angular · TypeScript | Applied AI

I build Angular and TypeScript interfaces for enterprise products: Zara Home (Inditex), Santander and UNIR.

Location: Zaragoza · remote from Spain or hybrid in Zaragoza
Availability: Available immediately · Permanent or B2B · EU citizen

Summary

Frontend Developer specialising in Angular and TypeScript. I have worked on e-commerce, banking and education products for Zara Home (Inditex), Santander and UNIR, covering AI integrations, SSR, accessibility and authentication. In my recent teams I was the frontend technical reference while still writing code every day. I currently build my own products and client projects with TypeScript, Cloudflare and AI.

Experience

2026 – present

Independent Software Developer

Own products & client projects · Zaragoza, Spain

Built and ran an AI lead-qualification bot for a coaching business across Telegram, WhatsApp and Instagram, on Cloudflare Workers.
Developing a multi-channel messaging engine in TypeScript (WhatsApp, Instagram, Messenger, Telegram) on Cloudflare Workers, Durable Objects and D1.
Also: demo websites for small businesses and an embeddable cost calculator on Cloudflare, code-driven video pipelines (Remotion, HyperFrames) for two YouTube channels, and an Android app in Kotlin.

2025 – 2026

Decskill España

Client: Zara Home (Inditex) · Frontend Developer (Angular)

Reduced the payload sent to AI tools from 570 KB to 22 KB per execution through routing and context stripping.
Integrated an automated multi-agent AI code review into pull requests, with general reviewers and reviewers carrying Zara Home business rules (feature flags, countries), catching defects before production.
Closed the findings of a formal WCAG 2.1 AA accessibility audit, covering keyboard navigation, heading structure, ARIA semantics and focus management.
Implemented the Angular integration for a voice-and-text shopping assistant using WebRTC and OpenAI Realtime API, released as a controlled production pilot behind a feature flag.
Delivered a country-by-country Help Center rollout and corrected SSR and feature-flag initialisation behaviour, including a hydration flash.
Delivered password and OTP authentication paths for the account-area migration and validated the flows in pre-integration.

2024 – 2025

Avanade Spain

Client: UNIR · Frontend Developer (Angular)

Served as the frontend technical reference for Angular architecture, component design and code quality.
Implemented authentication, administration, permissions and navigation components; refactored Admissions within an Nx monorepo to remove circular dependencies and centralise permissions.
Introduced ESLint, Prettier, unit tests and quality gates, reviewed most pull requests and mentored teammates on Angular practices.

2022 – 2024

Vermont Solutions (Viewnext/IBM)

Client: Santander · Frontend Developer (Angular)

Acted as the Angular reference across several banking applications, coordinating with backend, design and Scrum teams while implementing frontend features.
Served as the technical reference in an internal mobile banking app team and in a real-estate portal team.
Built a Chart.js transaction-monitoring dashboard with gesture interactions, and implemented Angular components using the bank's design system.
Maintained unit and component tests with Karma, Jasmine and Angular TestBed, alongside static analysis and code review.

2020 – 2022

ENZO (Rent & Buy S.A.)

Frontend Developer (Angular)

Built reusable Angular components and reactive forms.
Integrated REST services within an existing AWS serverless architecture, including Cognito authentication.
Trained new teammates on the codebase and Angular practices, and joined client requirements meetings in English.

2018 – 2020 Full Stack Developer (.NET/C#), consulting projects

Technical skills

Frontend

Angular 8-20
TypeScript
JavaScript
HTML
CSS/SCSS
RxJS
NgRx
Nx
Signals
standalone components
SSR
lazy loading
Angular Material/CDK

Product UI

accessibility
WCAG 2.1 AA remediation
responsive interfaces
design systems
component libraries
i18n/Transloco
React 17 (project experience)

Testing and quality

Jest
Playwright
end-to-end testing
Karma/Jasmine
Angular TestBed
unit and component testing
ESLint
Prettier
SonarQube/SonarCloud
code review

APIs and delivery

OpenAPI
OAuth 2.0
JWT
Git
CI/CD (GitHub Actions)

Backend

.NET/C#
ASP.NET
SQL Server (2018–2020 experience)
Cloudflare Workers
Durable Objects
D1
REST
AWS serverless (Cognito)

AI-assisted development

Claude Code
Codex
Cursor
code agents with reviewed output
MCP
automated code review with agents

Applied AI

OpenAI Realtime API
WebRTC
LLM integrations

Education and languages

Education: Higher Technician in Multi-platform Applications Development, Joyfe College, Madrid.
English assessment: goFLUENT English Proficiency Test, CEFR C2, March 2025.
Languages: Spanish and Romanian: native. English: full professional proficiency.

Contact

mihailmariusion@gmail.com

Zaragoza, Spain

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