Senior Frontend Engineer – Customer Portal, Auth & Billing

Zencoder; Paris; Hybride; EUR 103 000 - 138 000; Plein temps

Résumé du poste

A cutting-edge AI startup is seeking a Senior Frontend Engineer to lead the development of their customer portal. You will shape user interactions, tackle complex technical challenges, and drive engineering best practices. Ideal candidates have over 10 years of experience, particularly in TypeScript and React, and familiarity with authentication systems. This is an exciting opportunity to innovate at the forefront of AI-enhanced software development.

Prestations

Equity participation

Flexible working location

Growth potential in a high-growth startup

Qualifications

• 10+ years of experience in software engineering, especially in frontend development.
• Proven ownership of complex frontend applications like customer-facing portals.
• Experience with OAuth2 implementations and advanced AI assistants.

Responsabilités

• Take end-to-end ownership of customer portal's architecture and development.
• Design and implement new features and ensure maintainability.
• Drive best practices for testing and CI/CD.

Connaissances

TypeScript

React

Next.js

Auth0

Stripe

Outils

ShadCN

Radix UI

TailwindCSS

Description du poste

Senior Frontend Engineer – Customer Portal, Auth & Billing

Europe, Remote

About Zencoder

Zencoder is building the next generation of AI coding agents — advanced tools that supercharge developer workflows and elevate engineering impact. Our mission is to transform how software is built by equipping developers with AI-powered tools that boost productivity, improve code quality, and unlock creativity.

Our product integrates seamlessly with JetBrains IDEs and VS Code, helping developers generate, refactor, and repair code. It includes fast and intelligent AI code completion, and our agents can independently perform tasks like running shell commands or searching the web to assist with coding and debugging. We're especially proud of our proprietary Repo Grokking technology, which enables our AI agents to deeply understand your entire codebase, providing the strongest contextual understanding on the market. Zencoder also connects with 20+ popular tools like Jira, Sentry, GitHub, and GitLab, making it the most integrated AI coding solution available.

This is just a small part of what Zencoder is all about. There’s much more to discover — and we’re just getting started.

The Opportunity

We are seeking a Senior Frontend Engineer to take full ownership of our customer portal — a key product surface that’s still in its early stages but already built on solid foundations. In this role, you’ll lead its evolution end-to-end, shaping how our customers interact with the platform and also defining patterns, tackling complex edge cases, and driving best practices across product, design, and engineering.

You should be confident working with Next.js, experienced in integrating authentication providers like Auth0 or WorkOS, and have hands-on expertise with Stripe for billing and subscription workflows. Our UI is built with ShadCN, based on Radix UI and TailwindCSS — familiarity with any of these is a strong plus.

This is a unique opportunity to join an early-stage company led by the founder of a unicorn startup, Andrew Filev, and help scale it into a thriving, innovative business.

Key Responsibilities

• Take end-to-end ownership of our customer portal's architecture, development, and scaling, including billing flows, user management, and settings.
• Design and implement new features, refactor existing code for maintainability, and ensure production readiness across the stack.
• Raise the bar for engineering quality by driving best practices in testing, observability, CI/CD, and code structure.

Essential Qualifications

• 10+ years of experience in software engineering, including deep expertise in TypeScript, React, and Next.js.
• Proven ownership of complex frontend applications — ideally, customer-facing portals or dashboards.
• Experience with authentication systems (e.g., Auth0, WorkOS or other OAuth2 implementations).
• Familiarity with ShadCN, Radix UI, TailwindCSS, or equivalents.
• User experience with advanced AI assistants (e.g., Cursor, Claude Code, WindSurf).

Why Join Zencoder?

• Impact:Gen AI will change how companies develop software in the next two years. Be at the frontier of that AI work, building a category-leading product in a huge market. You will have an everyday opportunity to innovate.
• Growth potential:Thrive in a high-growth AI startup combining personal and career growth.
• High Talent Density:Collaborate daily with our experienced AI engineers, software engineers, and founder, Andrew Filev.
• Equity:Align your success with ours by participating in our equity plan.
• Flexibility:We hire globally, prioritizing talent over location. Work where you’re most productive and comfortable.

Zencoder is an equal-opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

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