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

About Merit

Merit 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 Company

This 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 Opportunity

As 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 platforms
• Designing and deploying AI-powered features for campaign automation and optimisation
• Architecting core systems to handle large-scale ad performance data
• Establishing engineering standards for reliability, scalability, and monitoring

Responsibilities

Platform & API Development

• Design and implement robust API integrations and microservices
• Build and maintain connections with ad, CRM, and analytics platforms
• Develop AI-powered features for campaign optimisation and analytics
• Architect scalable, distributed systems that handle high data volumes

Backend & Frontend Engineering

• Contribute to the async Python backend (FastAPI) and TypeScript/React frontend
• Implement monitoring and analytics for campaign and system performance
• Collaborate with product and design to turn feedback into technical solutions

Reliability & Performance

• Ensure integrations and APIs are secure, efficient, and resilient
• Handle rate-limited APIs with robust retry and queue mechanisms
• Champion best practices for testing, observability, and fault tolerance

What We’re Looking For

• 3+ years of experience in backend or full-stack software development
• Strong proficiency in Python (FastAPI preferred) and TypeScript
• Deep understanding of RESTful API design, async programming, and distributed systems
• Solid database skills (PostgreSQL, Redis) and experience with message queues (Celery, RabbitMQ)
• Strong problem-solving, debugging, and system design skills

Bonus 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 systems
• Understanding of ad metrics (CPC, CTR, ROAS, conversion tracking)

What Makes You Stand Out

• You’re AI-native — comfortable using LLMs as development partners and building AI-powered features
• You’ve built production integrations handling millions of API calls
• You design for reliability, handling limits, retries, and failures gracefully
• You believe in automation and clarity, not manual workarounds
• You write clean, typed, maintainable code and thrive in fast-moving environments

Tech Stack

• Backend: Python (FastAPI), Pydantic, SQLAlchemy, Alembic
• Frontend: TypeScript, React, Vite, TanStack Query
• Infrastructure: PostgreSQL, Redis, Celery, Docker
• APIs: Google Ads API, OpenAI, custom integrations
• Monitoring: Comprehensive logging and metrics collection

What’s in It for You

• Shape the technical direction of an emerging AI company
• Collaborate directly with the founding team on product and strategy
• Competitive compensation with meaningful equity
• Flexible working environment with global exposure (US & EU)
• A culture built on trust, ownership, and creative problem-solving

Why Work With Merit

Merit 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 24/7

Ready 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.