Backend Developer (AdTech)

Spalah is a Ukrainian venture builder that connects ambitious tech businesses with the international stage, fostering an ecosystem for rapid growth. We unite visionary founders and diverse talent to create companies that drive global progress.

• build and maintain scalable Node.js services (ES6+)
• improve application performance through profiling, optimization, and best practices
• enhance, refactor, and modernize existing codebases
• design efficient data models and work with SQL/NoSQL databases, including query optimization and caching
• write and maintain unit and integration tests, and contribute to high-quality code through code reviews
• troubleshoot and resolve production issues in Linux environments, ensuring system stability and reliability.

• hands-on experience with RTB / DSP / SSP / ad serving pipelines
• 3–5+ years of backend development experience with Node.js, Go, or Python
• strong understanding of asynchronous and concurrent programming
• experience building high-throughput / low-latency systems
• strong SQL skills (MySQL/PostgreSQL): indexing, query optimization, execution plans, transactions
• hands-on experience with Redis/MongoDB and caching strategies
• confident debugging and profiling skills
• solid understanding of HTTP/TCP and distributed systems
• strong command of Linux CLI and Git
• clean code approach with focus on performance, scalability, and reliability.

• flexibility and freedom: choose fully remote, hybrid, or office-based work yourself
• strong team: work alongside some of the industry’s top talent
• unlimited growth: grow in multiple directions, get freedom to launch your own product
• career development: take courses, attend top-notch conferences, explore digital library for nonstop growth
• health support: get medical insurance, paid vacation and sick leaves, and access to a corporate psychologist
• fun and culture: enjoy off site parties, team-buildings, sport events, and corporate gifts.