Software Engineer – Join a Fast-Growing AI Startup Redefining B2B Marketing

About MeritMerit is the AI recruiter that connects exceptional engineers with high-growth startups and scale-ups. We’re currently hiring a Product Engineer for a venture-backed AI company that’s transforming how B2B companies grow through intelligent, automated marketing.About the CompanyThis fast-growing AI startup is reimagining how marketing teams generate and convert leads. Their platform combines advanced AI optimisation with dynamic audience data, helping businesses unlock smarter, faster customer acquisition across major ad platforms.Having recently raised their seed round, the company is now scaling across the US and Europe. This is a rare opportunity to join an early-stage, venture-funded team that’s building the next generation of marketing intelligence — where product, AI, and customer experience converge.If you’re excited by the challenge of building from first principles, shaping product direction, and having a tangible impact on how companies grow, you’ll feel right at home here.The OpportunityAs a Product Engineer, you’ll sit at the intersection of AI, engineering, and product — designing integrations, building APIs, and developing AI-powered features that empower marketers to achieve unprecedented results.You’ll work directly with the founding team, owning projects end-to-end and shaping the technical foundation of a rapidly growing platform.In your first 12 months, you’ll focus on:Building scalable APIs and integrations with advertising, CRM, and analytics platformsDesigning and deploying AI-powered features for campaign automation and optimisationArchitecting core systems to handle large-scale ad performance dataEstablishing engineering standards for reliability, scalability, and monitoringResponsibilitiesPlatform & API DevelopmentDesign and implement robust API integrations and microservicesBuild and maintain connections with ad, CRM, and analytics platformsDevelop AI-powered features for campaign optimisation and analyticsArchitect scalable, distributed systems that handle high data volumesBackend & Frontend EngineeringContribute to the async Python backend (FastAPI) and TypeScript/React frontendImplement monitoring and analytics for campaign and system performanceCollaborate with product and design to turn feedback into technical solutionsReliability & PerformanceEnsure integrations and APIs are secure, efficient, and resilientHandle rate-limited APIs with robust retry and queue mechanismsChampion best practices for testing, observability, and fault toleranceWhat We’re Looking For3+ years of experience in backend or full-stack software developmentStrong proficiency in Python (FastAPI preferred) and TypeScriptDeep understanding of RESTful API design, async programming, and distributed systemsSolid database skills (PostgreSQL, Redis) and experience with message queues (Celery, RabbitMQ)Strong problem-solving, debugging, and system design skillsBonus points for:Experience with ad platform APIs (Google Ads, LinkedIn, Meta, etc.)CRM or analytics integrations (Salesforce, HubSpot, GA4, Segment, Mixpanel)Familiarity with AdTech systems (RTB, DSPs, SSPs)Managing rate-limited APIs or building high-throughput data systemsUnderstanding of ad metrics (CPC, CTR, ROAS, conversion tracking)What Makes You Stand OutYou’re AI-native — comfortable using LLMs as development partners and building AI-powered featuresYou’ve built production integrations handling millions of API callsYou design for reliability, handling limits, retries, and failures gracefullyYou believe in automation and clarity, not manual workaroundsYou write clean, typed, maintainable code and thrive in fast-moving environmentsTech StackBackend: Python (FastAPI), Pydantic, SQLAlchemy, AlembicFrontend: TypeScript, React, Vite, TanStack QueryInfrastructure: PostgreSQL, Redis, Celery, DockerAPIs: Google Ads API, OpenAI, custom integrationsMonitoring: Comprehensive logging and metrics collectionWhat’s in It for YouShape the technical direction of an emerging AI companyCollaborate directly with the founding team on product and strategyCompetitive compensation with meaningful equityFlexible working environment with global exposure (US & EU)A culture built on trust, ownership, and creative problem-solvingWhy Work With MeritMerit connects you directly with hiring managers at elite startups and scale-ups — no résumé black holes, no endless applications. Spend 20 minutes speaking with Merit, and get matched with roles like this one that align with your experience and ambitions. ✅ Access exclusive startup and scale-up opportunities ✅ Fast-tracked introductions to founders and hiring managers ✅ Guidance from your personal AI recruiter, available 24/7Ready to explore your next chapter?Meet Merit today and get matched with roles that match your ambition and potential.👉 Apply via Merit to learn more about this Software Engineer opportunity.