Fullstack Engineer

Our client, a new Silicon Valley based profitable B2C product startup building innovative mobile solutions for the planet, is now looking for a talented and experienced Fullstack Engineer.

Location: Europe
Type: Remote, Full-time
Start date: ASAP
About Company:

Headquartered in Silicon Valley, the company boasts a leadership and investor team with former executives from Rakuten and Dropbox. Its flagship product, a VPN service, is a leading solution downloaded more than 100M times a year, ensuring online privacy and anonymity for users by creating a private network from a public internet connection. Its eSIM brand provides seamless global connectivity for travelers and digital nomads. 
The company operates fully remotely, with a strong presence in Singapore, Hong Kong, Poland, and Ukraine.

About Project:

It`s a modern subscription-based VPN service platform serving users across multiple platforms (iOS, Android, Windows, macOS). The web application handles user authentication, subscription management, payment processing, and integrates with various third-party services. The platform supports 15+ languages and serves a global user base.

Responsibilities:

• Build & maintain full-stack features across our Next.js application
• Develop API endpoints for mobile clients (iOS, Android, Windows, macOS)
• Integrate payment systems (Recurly, App Store, Google Play)
• Write clean, type-safe code with TypeScript
• Implement i18n for new features across 15+ locales
• Write and maintain E2E tests with Playwright
• Optimize performance for global users with varying network conditions
• Collaborate with mobile teams on API contracts and data synchronization
• Monitor & debug production issues using Datadog and ClickHouse analytics

Requirements:  

• 3+ years of experience with React and Node.js/TypeScript
• Strong experience with Next.js (App Router preferred)
• Experience with REST API design and implementation
• Familiarity with payment/subscription systems (Stripe, Recurly, or similar)
• Experience with SQL databases and analytics tools
• Understanding of authentication & authorization (JWT, sessions)
• Good knowledge of CSS/Tailwind for responsive UI development
• Experience writing automated tests (unit, integration, or E2E)   

Nice to Have:    

• Experience with GraphQL / Hasura

• Familiarity with Cloudflare Workers or edge computing

• Experience with ClickHouse or similar OLAP databases

• Knowledge of App Store / Google Play in-app purchase flows

• Experience with SendGrid or other email service providers
• Familiarity with i18n best practices for global applications
• Experience with Playwright or similar E2E testing frameworks

Why Join:

• Work on a product used by millions of users worldwide
• Modern tech stack with the latest versions of React, Next.js, and TypeScript
• Opportunity to work on cross-platform integrations (web, iOS, Android, desktop)
• Exposure to payment systems, analytics pipelines, and global infrastructure
• Collaborative environment with mobile and backend teams