Senior Backend Developer (Node.js)

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!