Senior/Staff Frontend Engineer, Next.js, JavaScript

HumanIT Digital Consulting

. Own architectural decisions on complex Next.js applications .

Posted 10/9/2026full-timeRemote • PortugalSenior💰 €2,800 - €3,650 per monthWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in architecting complex Next.js applications, with a strong focus on performance, testing, and scalability. Proven ability to drive web-native product development in high-traffic environments while fostering a culture of ownership and self-organization.

Highest-signal resume keywords

Next.js Application ArchitectureRendering Strategies (SSR, SSG, ISR, RSC)Vanilla JavaScript (ES6+)Automated Testing PracticesWeb Performance Optimization

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Next.jsJavaScript (ES6+)DOM ManipulationRendering StrategiesCaching StrategiesCore Web VitalsSEO OptimizationAutomated TestingUser Interface DesignWeb Performance

Soft Skills

OwnershipSelf-MotivationAutonomyCollaborationCommunication

Industry Keywords

High-Traffic Web ProductsWeb-Native PlatformsSaaSConsumer WebDigital Platforms

Tech Stack

Tools & technologies

JavaScriptNext.jsReact

About the role

Key responsibilities & impact

Own architectural decisions on complex Next.js applications
Shape how the frontend scales, performs and gets tested
Drive the architecture of large Next.js applications, including scaling within the App Router ecosystem
Push a strong testing culture that keeps production reliable
Build fast, reliable web products used by large audiences
Work in a product-driven digital company building high-traffic, web-native platforms for a global audience
Own decisions, impact and career growth in a highly autonomous, self-organized team

Requirements

What you’ll need

9+ years of professional software engineering experience, mainly on high-traffic, web-native products (SaaS, consumer web or large-scale digital platforms)
Proven experience driving the architecture of complex Next.js applications (App Router, Next.js 13+)
Deep understanding of rendering strategies: SSR, SSG, ISR and React Server Components (RSC), plus caching strategies
Experience moving to or scaling within the App Router ecosystem
Strong command of Vanilla JavaScript (ES6+), DOM manipulation and browser mechanics, and how the web works beneath the frameworks
Hands-on focus on web performance: Core Web Vitals, SEO optimization and accessible, fast user interfaces
A shift-left mindset with rigorous automated testing practices for production web apps
Ownership, self-motivation and the ability to thrive in a self-organized environment
Fluent English (written and spoken)

Benefits

Comp & perks

15th month salary
Health insurance covering your family
Birthday off
Mobility program for digital nomads
Real work-life balance