Senior Frontend Engineer, Portal — Vue 3 & Design System

Cobre; Jyväskylä; On-site; EUR 70,000 - 110,000; Full time

Job summary

Cobre is seeking a Senior Frontend Engineer to join the Portal team in Jyväskylä, Finland. You’ll own and evolve modular frontend applications, integrate with backend services, and contribute to a robust design system with accessibility and performance in mind.

You’ll work closely with Product, Design, Backend, QA, and cross-functional teams to deliver high-quality features, write tests with Playwright, and support observable frontend architectures while keeping code clean and maintainable.

Qualifications

• 5+ years of experience building production-grade frontend applications.
• Strong hands-on experience with Vue 3, TypeScript, Pinia.
• Strong HTML and SASS skills with pixel-perfect implementation.
• Experience implementing and maintaining microfrontend architectures.
• Solid experience integrating RESTful APIs in API-first environments.
• Familiarity with Node.js - Express and hexagonal architectures (BFFs).
• Experience with observability in the frontend (error monitoring, performance tracking).
• Experience building and evolving Design Systems, including design tokens.
• Proficient in writing component-level and end-to-end tests using Playwright.
• Experience with feature flagging, A/B testing, or version-controlled frontend rollouts.
• Excellent communication and collaboration skills in cross-functional teams.

Responsibilities

• Develop and maintain microfrontend applications integrated with Cobre’s Design System.
• Integrate internal and external APIs in an API-first environment, collaborating with backend teams.
• Implement observability, logging, and monitoring in the frontend (metrics, error tracking, performance).
• Contribute to the evolution of frontend architecture (modularity, lazy loading, security).
• Design and implement BFF endpoints to support frontend needs and data flows.
• Write testable, accessible, maintainable, and scalable frontend code.
• Participate in code reviews, architecture decisions, and standards.
• Collaborate with Product, Design, Backend, QA, and other teams to deliver features.

Skills

Vue 3

TypeScript

Pinia

HTML & SASS

Microfrontend architecture

REST APIs

Node.js Express

Observability & monitoring

Design Systems

Playwright testing

Tools

Node.js - Express

Playwright

OpenTelemetry

Mixpanel

Design Tokens

Job description

Cobre is seeking a Senior Frontend Engineer to join the Portal team in Jyväskylä, Finland. You’ll own and evolve modular frontend applications, integrate with backend services, and contribute to a robust design system with accessibility and performance in mind.

You’ll work closely with Product, Design, Backend, QA, and cross-functional teams to deliver high-quality features, write tests with Playwright, and support observable frontend architectures while keeping code clean and maintainable.