We're seeking exceptional Backend Product Engineers to build the infrastructure powering the future of AI-driven email marketing. You'll design and scale systems that handle millions of emails, real-time content generation, and seamless integrations. Full-time position based in Barcelona with competitive compensation.

Migma.ai transforms email creation from a multi-day process into an instant task. Using AI that understands your brand and content sources, anyone can generate compelling, responsive emails without designers, developers, or marketing expertise. We're democratizing professional email marketing for millions of businesses worldwide.

Thousands of companies and agencies are already using Migma.ai to slash costs, maximize ROI, and send emails that actually convert. And we're just getting started. We're a small, talent-dense team building a category-defining company from Barcelona.

We value high ownership, rapid iteration, and ego-free collaboration. We seek people who care deeply, challenge assumptions, and are driven to build something transformative.

What you'll do

Design, implement, and maintain backend services, APIs, and email delivery infrastructure

Build robust integrations with email service providers (SES, SendGrid, Resend) and handle deliverability challenges

Create scalable systems for template management, dynamic content generation, and subscriber management

Architect data pipelines for analytics, tracking opens/clicks, and managing unsubscribes

Own backend systems end-to-end: architecture, implementation, deployment, monitoring, and optimization

Collaborate with frontend, AI, and product teams to translate ambitious ideas into robust, scalable features





Implement caching strategies and optimize database queries for sub-second response times

Build webhook systems for real-time email events and third-party integrations

Shape our backend architecture, API standards, and technical strategy as we scale

What we're looking for

Based in Barcelona (on-site/hybrid working model)

5+ years of experience designing, building & scaling backend systems for production products

Fluency in Node.js, Python, with strong API design skills

Deep understanding of distributed systems, message queues, caching strategies, and scalability patterns

Experience with email infrastructure (SMTP, deliverability, bounce handling, rate limiting)

Proven experience integrating with AI/ML systems and third-party APIs (CRMs, e-commerce platforms, analytics)

Strong understanding of database design (PostgreSQL, Redis, MongoDB) and query optimization

Experience with event-driven architectures and real-time data processing

Strong product instincts: you know how to balance fast delivery with building for the long term

Fluent English communication skills (written and spoken) - essential for team collaboration

Portfolio or GitHub profile with production-level projects is mandatory - Please do not apply without demonstrable work

Message Queues: RabbitMQ, AWS SQS, Redis Pub/Sub

AI/ML Integration: OpenAI, Anthropic Claude, Langchain

What We Offer

Highly competitive salary - We believe in compensating top talent accordingly

Full-time position based in our Barcelona office

Work with cutting-edge AI technology in a rapidly growing market

High impact role in a small, ambitious team

Professional growth opportunities as we scale

Modern office in the heart of Barcelona

📌 Backend Product Engineer (Madrid)
🏢 Migma
📍 Madrid