Staff Frontend Software Engineer - React and Next.js

Mindera; United States; Hybrid; USD 180,000 - 240,000; Full time

Benefits offered by this job

Flexible working hours

Training & conferences budget

Profit-sharing

Laptop & peripherals

Hotspot with unlimited usage (PT)

Team events and annual trip

Job summary

Mindera is seeking a Staff Frontend Software Engineer to build fluid, responsive UIs across platforms. You will lead frontend architecture, drive performance, and champion testing and quality. You’ll guide teams in a self-organized, agile environment and contribute to world-class frontend systems for global users.

You’ll work within a culture that values empathy, risk-taking, and collaboration, with travel up to 0–15% based on project needs. Join us to shape frontend engineering at Mindera.

Qualifications

• 9+ years of professional frontend engineering experience with high-traffic web apps.
• Deep expertise in Next.js architectures, SSR/SSG/ISR/RSC and App Router.
• Strong Vanilla JavaScript and React.js fundamentals for large-scale interfaces.
• Focus on web performance, accessibility, and reliable user experiences.

Responsibilities

• Architect and build high-performance, secure frontend solutions across platforms.
• Drive engineering excellence and quality standards for global users.
• Lead testing strategies including unit, integration, and end-to-end testing.
• Collaborate in Agile environments (Scrum/Kanban) toward shared goals.

Skills

9+ years frontend engineering

Next.js architecture

Vanilla JavaScript

React.js

Web fundamentals

Web performance

Shift-Left testing

Agile: Scrum/Kanban

Ownership & leadership

Tools

Azure Cloud

AWS

Google Cloud

New Relic

Datadog

Dynatrace

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.

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
• 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.

What’s in it for You?

We work in Self-organization culture and therefore we offer a flexible, supportive environment where you are trusted to manage your own time and career.

• 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