Python Backend Developer, Fullstack-capable (Remote)

Location: Belgrade, Serbia Workplace: remote Novakid is an online English school for kids. The Visitor Squad owns the funnel from first visit to paid lesson: landing pages, registration and booking, blog, and the visitor's personal account. We track two key metrics, visitor → lead and visitor → booking, and test almost everything we ship through experiments. This is a backend-first role: about 70% backend (Python, some Node.js ) and 30% frontend (React/TypeScript). You'll own the server side of the funnel: APIs behind registration, booking and the visitor account, attribution, and server-side integrations with ad platforms. When a feature needs frontend work, you'll take it end-to-end yourself. You'll work within the squad's processes: planning, grooming, code review, sprints and releases. Key Responsibilities Design, build and maintain Python services and APIs behind the funnel: registration, booking and the visitor account Build and own server-side integrations with ad platforms (Meta CAPI, TikTok Events API and similar): event delivery, deduplication, retries and monitoring Own attribution on the backend: end-to-end visit tracking, UTM persistence, and diagnosing gaps in V2L/V2B data Keep services fast and reliable: caching, query optimization, debugging server-side rendering in our Node.js/Express layer Investigate production incidents through Sentry and see them through to resolution Support A/B testing on the server side: feature flags, rollouts, and cleanup after experiments Ship frontend changes in React/TypeScript when a feature needs it Requirements 5+ years of production backend development in Python, including services you designed, shipped and supported in production yourself Strong backend fundamentals: API design, relational databases and SQL, caching, background jobs, and integrating third-party APIs (auth, rate limits, retries, idempotency) Production debugging experience: logs, error tracking, finding the root cause of an issue Node.js : comfortable reading and changing an Express service Working frontend skills: enough TypeScript and React to deliver a feature end-to-end. Expert level not required. An understanding of how tracking data travels from click to report, and the ability to find where it gets lost Product mindset: you work with metrics and hypotheses, not just tickets Fluent English Nice to Have Server-side conversion tracking (CAPI, Events API, server-side GTM) BigQuery: checking your own hypotheses with data CDN and edge caching (CloudFront or similar) GDPR and consent mechanisms E2E testing with Playwright or Cypress Our Tech Stack Python, Node.js , Express (SSR), TypeScript, React, Next.js , Sentry, GrowthBook, BigQuery. What we offer Fully remote work A chance to shape the future of AI-driven education A fun, dynamic team that loves building innovative products Unlimited holidays, because we trust you to deliver