Backend Developer (Node.js)

Job description

Join **Zeely AI as a Senior Backend Developer** and help build one of the largest AI products for businesses. We're looking for a strong backend engineer who wants to work on high-load services, influence architectural decisions, and build systems that scale alongside a rapidly growing business. Over the past six months, our backend team has grown to 14 engineers, and we're continuing to expand. Today, Zeely is the #1 AI product in its niche in the U.S. market, and our ambitious goal is to become a global company by 2028. You'll be joining a strong engineering environment, working alongside former Tech Leads, Engineering Managers, and Senior Engineers who foster a high engineering standard, support each other's growth, and tackle complex technical challenges together. **Zeely AI** is the agentic AI platform for creating, launching, and scaling paid ads. Want to see what we're building? Check out examples of our AI-generated videos on our website and across our Instagram, X (Twitter), and LinkedIn. We highly recommend taking a look before applying—it's the best way to experience the product you'll be working on. **Your key responsibilities:** - Developing and maintaining the back-end of web applications - Designing and building REST APIs - Working with PostgreSQL and Redis databases - Integrating with third-party APIs - Building and deploying applications on AWS (EC2, S3, CloudFront) - Writing unit and integration tests - Optimizing application performance - Debugging and troubleshooting issues - Writing technical documentation - Conducting code reviews **What we’re looking for:** - 5+ years of commercial experience with Node.js applications - 1+ years of experience with microservices architecture - 2+ years of hands-on work with Redis and PostgreSQL/MySQL (data modeling, indexing, caching, ORM such as Prisma/TypeORM/Drizzle ORM) - Experience with AWS - 2+ years of experience with message brokers - 1+ years of experience with Docker - Understanding of scalable and reliable system design principles - Experience with version control systems (Git) **Nice to have:** - 1+ years of experience with the NestJS framework - Experience with payment systems - Valid AWS certification - Commercial experience with high-load systems - Experience building back-end for iOS, Android, and web applications - Experience with Terraform/Pulumi - Commercial experience with AI APIs - English level: Upper-Intermediate **Why it’s exciting to work with us:** - Work with cutting-edge technologies and contribute to building AI-powered tools - Join a strong A-level team that motivates you to grow and achieve more - Remote-first approach: work from anywhere, with the option to visit our offices in Warsaw and Kyiv - Paid day offs and sick leaves — we care about your work-life balance - Regular performance reviews to ensure your growth is transparent and rewarded - Financial support — consultations for private entrepreneurs from our dedicated finance team **Recruitment process:** Intro call > Test Task > Technical Interview > Final Interview > Reference check > Offer **Send us your CV — we’d love to get to know you better!**