Frontend Technical Lead

Zenitech

Location: Romania
Job Type: full-time
Salary: Unknown
Posted: September 19, 2025

Job Description

The Role

We are seeking a highly experienced and motivated Web Frontend Tech Lead with deep expertise in Next.js to join our engineering team. In this leadership role, you will drive the architectural and technical direction of our web applications, ensure high-quality code standards, mentor team members, and actively contribute to planning, performance optimization, and stakeholder alignment.

What you will do

You’ll be part of the leadership team, helping steer the direction of the product and the platform.
Your team is going to be around 10 highly engaged web developers looking for direction and guidance from you
You’ll have an opportunity to influence architecture and technology decisions, helping the client make smart, long-term choices.
You will need to sometimes make hard decisions. Based on constraints of time and scope of feature.
You’ll collaborate with other leads – you’re not alone in this. There’s always someone to bounce ideas off or work through challenges together.
There are senior team members who’ve been with the project since the beginning – they’ll support you, and they know the codebase inside and out.
Your experience in solving tricky tech and people problems will be incredibly valuable – and appreciated.
There’s already a lot of code written – but it’s ready for someone like you to improve it, elevate it, and make it shine.
The web front-end has important accessibility and performance requirements to be used by millions of customers, meaning your influence and decisions will make an impact.

Requirements

7+ years of experience in WEB development with JavaScript/TypeScript.
2+ years of experience using Next.js in production environments.
Proven experience in leading frontend development teams or projects.
Strong understanding of modern web architecture, performance tuning, and browser rendering behavior.
Proficient in frontend testing frameworks, CI/CD pipelines, and monitoring tools.
Excellent communication and leadership skills.
Experience working in Agile/Scrum environments.
Experience in accessibility.
Experience with mobile-first and responsive design.
Familiarity with GraphQL, WebSockets, or real-time communication.
Exposure to backend technologies (Node.js, APIs) is a plus.
Experience in enterprise or high-scale consumer-facing applications.

What we offer

Hybrid/flexible working model and flexible working hours
Private Medical and/or Health Insurance (location dependent)
Length of Service Awards
Referral programme
The option of a cafeteria package, meal tickets, or team lunches (location dependent)
A culture of continuous growth, supported by our People Lead system and various training resources for your personal development
Agile mindset, simplified processes, and a great atmosphere where commitment and autonomy are celebrated
A community-first mindset, working with talented people across technology products and consulting
Charity events and programs

(*) As we hire permanent employees for this role, we offer remote opportunities only in Romania, and Hungary.

Additional benefits based on location:

Hungary:

Extensive benefit package: SZÉP card (a multipurpose cash replacement item for accommodation, meal, leisure & entertainment purposes)

Romania:

Bookster library subscription, and the opportunity to work from abroad (max. 60 days per annum)

About us

Zenitech is a leading technology solutions provider dedicated to reshaping the global digital landscape. Headquartered in the UK, Zenitech operates internationally, with offices in Lithuania, Romania, and Hungary.

We use a bespoke approach depending upon where the client is on their digital journey, comprising a combination of access to dedicated R&D labs, technology implementation advice, and specialist nearshore development talent. As an international community of individuals who are open to learn from each other, we collectively define and input into the digital future of the clients’ businesses.

Why Zenitech?

Impactful Projects: Drive meaningful change through digital transformation projects and have an opportunity to make an impact on many different industries.
Collaborative Culture: Be part of a diverse, inclusive team committed to growth, innovation, and continuous learning.
Professional Growth: Zenitech supports continuous learning and development through the People Lead system, helping you advance your skills and career.

Diversity and Inclusion

Zenitech celebrates diversity in all its forms. We aim to create an inclusive environment where everyone feels valued for their unique contributions and perspectives. If you require any adjustments during the application process, please let us know—we’re here to help.

🎯 Who is this job for?

This role is ideal for a Frontend Technical Lead with 7+ years of experience in JavaScript/TypeScript and at least 2 years using Next.js in production. Candidates should have proven leadership in scalable web architecture, performance optimization, accessibility, and strong skills in frontend testing, CI/CD, and Agile environments. Familiarity with GraphQL, WebSockets, and Node.js is a plus, especially in enterprise-scale applications.

💬 Potential Interview Questions

When would you choose SSR, SSG, ISR, or Edge Rendering in Next.js?
SSR for per-request personalization, SSG for content that rarely changes, ISR for mostly-static pages needing periodic revalidation, and Edge for ultra-low-latency personalization close to users.
How do React Server Components (App Router) change data fetching and bundling?
They run on the server, can fetch data without shipping fetching code to the client, and reduce bundle size; use fetch with cache/revalidate options and stream UI with Suspense to avoid waterfalls.
How would you prevent Core Web Vitals regressions at scale?
Optimize LCP (preload hero image/font, next/image), minimize CLS (reserve space, font-display: swap/next/font), and reduce INP/TBT (code-split with dynamic(), defer non-critical work, avoid long tasks).
What techniques keep rendering smooth given browser layout/paint/composite behavior?
Batch DOM reads/writes, avoid layout thrash, use transforms/opacity for animations (GPU-friendly), leverage CSS containment, and memoize expensive React subtrees.
What’s your approach to accessibility in a consumer app used by millions?
Semantic HTML first, robust keyboard navigation and focus management, ARIA only where necessary, color-contrast compliance, and automated checks (axe) plus assistive-tech manual testing.
How do you structure testing for a Next.js codebase?
Unit tests with Jest/Vitest, component tests with React Testing Library, E2E with Playwright (including a11y scans), and contract/snapshot tests for critical server components.
What does “production-grade” CI/CD for web look like?
Type/lint/test gates, bundle-size and Lighthouse budgets, preview deployments per PR, environment-specific configs, feature flags, canary releases, and automatic rollback on SLO/SLA breaches.
How do you add observability to the frontend and tie it to backend traces?
Use RUM for Web Vitals and errors (e.g., Sentry, OpenTelemetry), propagate trace headers to APIs, sample wisely, and build dashboards for vitals, JS errors, and route-level latency.
How would you integrate GraphQL efficiently in Next.js?
Use codegen for type-safe hooks, persisted queries to improve cache/CDNability, server-side execution in RSC where possible, and normalized caching client-side for interactive views.
When do you use WebSockets vs SSE for real-time features, and how do you scale them?
SSE for one-way streaming and simplicity; WebSockets for bi-directional presence/controls. Scale via a broker (e.g., Redis pub/sub), sticky sessions (or a stateful gateway), and backoff/reconnect logic on the client.

📋 Job Summary

Zenitech is hiring a Frontend Technical Lead (remote in Hungary or Romania) to drive architecture and team direction for high-impact web applications using Next.js. Lead a team of 10, influence tech decisions, improve performance and accessibility, and contribute to enterprise-scale solutions. Requires 7+ years' experience in web development, 2+ years with Next.js, and strong leadership skills. Enjoy flexible work, private healthcare, training support, and a collaborative, growth-driven culture.