Company: HypefyLocation: On-site/Hybrid (Zagreb)Type: Full-timeIntroHi - were Hypefy, a Croatian-based start-up.Were building AI agents that run influencer marketing end-to-end: campaign creation, creator selection, outreach, content checks, payments, reporting - all automated, all at scale.We want to make influencer marketing so efficient that spending your budget anywhere else stops making sense.This is already live, used by real brands and creators across more than 35 countries. Now we want to scale globally, and we need another strong engineer to help us get this right.What you'll work onYoull build and evolve core product features across backend and frontend, with direct exposure to AI workflows, campaign automation, and scaling infrastructure.Backend (Primary Focus)Design, build, and maintain backend services using Node.jsTake features from idea production monitoring iterationArchitect and operate background job systems (queues, workers, retries, fallbacks, failure handling)Ship AI-driven features with strong guardrails: schema validation, retries, and safe fallbacksIntegrate, harden, and monitor third-party services for reliability and scaleMake MongoDB fast and predictable through good data models and indexingUse Redis / BullMQ for queues, caching, rate limits, and transient stateFrontendBuild and refine UI features for both mobile and web (React)Surface system state clearly (background jobs, AI progress)Collaborate closely with design and product on usability for complex workflowsPlatform & ReliabilityImproving observability (logs, metrics, traces) so debugging doesnt feel like guessworkContribute to scalability initiatives (regional deployments, throughput improvements)Participate in incident response and postmortemsHelp automate operational workflows (payments, reconciliation, support tooling)How We WorkSmall, senior-leaning engineering teamHigh ownership, low bureaucracyYoull talk directly with product and foundersWe utilize a lot of AI coding tools for code reviews, small features/bugfixes etc.What Were Looking ForRequiredStrong Node.js experienceExperience with frontend js frameworksComfort with async systems, background jobs, and failure scenariosComfortable owning features end-to-end (backend + frontend integration)Comfortable making technical and product decisions (in line with established standards) with incomplete information, without needing every detail handed to youComfortable using technical debt intentionally, and disciplined about cleaning it upExperience working with production systems that handle real users and failuresSome experience with MongoDB (schema design, indexing, performance)Clear communication and strong ownership mindsetNice to HaveStrong experience with ReactExperience in PythonExperience with AI / LLM integrations in production, and AI librariesExperience utilizing advanced AI coding workflowsPrior work in SaaS, marketplaces, or workflow-heavy platformsWhy Join HypefyYoull work on complex, sometimes messy systems, and help make them betterSmall, agile engineering team where input is not only allowed, but expectedPragmatic engineering cultureWork on a real AI product, that aren't just a bolt-on, used in live customer workflowsDirect impact on architecture and scaling decisionsInterview ProcessIntro call (context + expectations)Live interviewOffer