Staff Frontend Software Engineer - React and Next.js

Mindera; Coimbra; Hybrid; EUR 65,000 - 95,000; Full time

Benefits offered by this job

Health insurance

Flexible working hours

Remote work option

Training budget

Profit-sharing model

Job summary

Mindera is seeking a Staff Frontend Software Engineer to lead the design and implementation of high-performance, cross-platform frontend interfaces. You will champion engineering excellence and steer complex Next.js architectures, collaborating across global teams while shaping frontend strategy.

You will drive testing culture, embrace TDD, and mentor others in a self-organized environment, with travel 0-15% as project needs dictate.

Qualifications

• 9+ years of professional engineering experience
• Deep expertise in high-traffic, web-native products (SaaS, consumer web, or large-scale platforms)
• Strong Next.js architecture knowledge: SSR/SSG/ISR, caching, App Router
• Mastery of Vanilla JavaScript and browser fundamentals
• Proven testing culture: unit/integration/E2E, Shift-Left, TDD
• Nice-to-have AI enablement for frontend architecture and tooling

Responsibilities

• Architect and build high-performance frontend solutions
• Champion engineering excellence and maintain high-quality UIs
• Drive testing strategies and shift-left practices
• Provide collaborative leadership within Agile teams (Scrum/Kanban)

Skills

Empathy

Self-organization

Ownership

Ambition

Courage to take risks

Tools

Vanilla JavaScript

React.js

Next.js

App Router

SSR/SSG/ISR

Job description

At Mindera, we are continuously developing a fantastic team, and we would love for you to join us. As a Staff Frontend Software Engineer, you will be responsible for building fluid and responsive user interfaces for multiple platforms and devices.

We are looking for experienced Engineers with an appetite for solving complex problems and building seamless user interactions to world-class standards. You won't just be writing code; you'll be a technical leader helping us define the future of our frontend architectures.

We value empathy, self-organization, and the courage to take risks. If you love navigating ambiguity and believe that empowering others is the hallmark of a great engineer, you'll feel right at home here.

National and international expected traveling time varies according to project/client and organizational needs: 0%-15% estimated.

How You'll Contribute

• Architect & Build: Lead the design and development of high-performance, secure, and scalable frontend solutions
• Engineering Excellence: Champion high-quality standards in developing great user interfaces that impact users worldwide
• Testing Strategy: Drive reliability through unit testing, integration testing, and a Shift-Left/TDD approach
• Collaborative Leadership: Work within Agile methodologies (Scrum/Kanban), moving self-driven toward a common team or company purpose with minimal supervision

Requirements

You're Great At...

• Experience: Bringing 9+ years of professional engineering experience, with a heavy focus on high-traffic, web-native products (SaaS, consumer web, or large-scale digital platforms)
• Next.js Architecture: Driving the architecture of complex Next.js applications. You deeply understand rendering strategies (SSR, SSG, ISR, RSC), caching, and transitioning or scaling within the App Router ecosystem
• Web Fundamentals: Mastering Vanilla JavaScript and browser mechanics. You understand the core of the language, DOM manipulation, and how the open web actually works beneath the frameworks
• Web Performance: Obsessing over Core Web Vitals, SEO optimization, and delivering lightning-fast, accessible user interfaces to a global audience
• Testing Culture: Cultivating a shift-left mindset and rigorous automated testing practices to catch issues early, ensuring high reliability for production web apps
• AI Enablement (Nice to Have): Such as creating the reusable frontend architecture, tooling, and abstractions that accelerate internal AI development across multiple teams
• Mindset: Being passionate, self-driven, and thriving in a self-organized environment where you take ownership of your career, architectural decisions, and product impact

Your Technical Toolkit

• Core: Expert-level Vanilla JavaScript, React.js, and Next.js (including advanced routing and server-state management)
• Quality: Deep knowledge of Testing (Unit, Integration, E2E, TDD, Shift-Left) tailored for modern web applications
• Cloud: Professional experience with Azure Cloud/AWS/Google Cloud is considered a significant plus
• Observability: Familiarity or experience with New Relic/Datadog/Dynatrace for monitoring web performance, client-side errors, and API latency is a plus
• Methodology: Strong experience working in Scrum and Kanban environments for agile, product-led web teams

Recruitment Stages

• Screening - Reviewing CVs and eligibility verification
• 1st Call - 30-minute call to assess Technical & Culture Fit with an IT Recruiter
• Tech Interview - 2-hour call with two of our Engineers to assess your knowledge in depth, featuring theoretical scenarios and architectural exercises
• Cultural Interview - 1-hour call with a Minder to ensure alignment with our values
• Project/Client Call - A final 30 to 60-minute call to ensure the perfect fit for a specific mission

Benefits

What's in it for You?

• Well-being First: health insurance and "Open Holidays" because we trust you to know when you need a break
• Flexible Working hours and Work: Work from our vibrant hubs in Porto, Aveiro, or Coimbra, or choose a remote setup that works for you. As long as you are based in Portugal :)
• Career Growth: A dedicated budget for training and conferences, plus a transparent profit-sharing model
• Tools for Success: Choose Laptop & Peripherals that best suit your needs, plus Hotspot with unlimited usage (PT), for work or Netflix ;)
• Team work makes the dream Work: Mindera Annual Trip, Sports, and sharing groups to connect and have fun!

Why Mindera?

At Mindera, we use technology to build products we are proud of, with people we love.

We believe diverse teams build better products. Mindera is a place where you can be your authentic self, regardless of gender, age, ethnicity, religion, or background. We strive to create an environment where everyone feels they belong and has an equal opportunity to grow.

Most of all, you get to work with a group of great people in a politics free environment where the whole team owns the project together. Our culture reflects our lean and self-management mindset, encouraging colleagues to take risks, make decisions, collaborate openly, and communicate with everyone.

Freedom and responsibility go hand in hand, and we value commitment, feedback, and empathy. We are proud of our work and love learning about everything as we navigate an Agile, Lean, and collaborative environment.

Curious to know more? Check out our Blog and our Handbook!

Our offices are located: Porto, Portugal | Aveiro, Portugal | Coimbra, Portugal | Leicester, UK | San Diego, USA | San Francisco, USA | Chennai, India | Bengaluru, India | Cluj-Napoca, Romania | Blumenau, Brazil