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# Backend Product Engineer

- **Company:** Migma
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Data Analysis, Database Design, Database Queries, Distributed Systems, Github, Python (Programming Language), PostgreSQL, Simple Mail Transfer Protocols, Microsoft Message Queuing, MongoDB, Node.Js, Software Architecture, Query Optimization, Queueing Systems, RabbitMQ, Redis, Systems Integration, Working Model 2D, Caching, Backend, Rate Limiting, Event Driven Architecture, Real Time Data, Dynamic Content, Machine Learning Operations, Sendgrid, Front End Software Development, Api Design, Stream Processing, Data Pipelines, Web Api
- **Published:** September 19, 2026
- **Apply:** https://www.buscojobs.com.es/backend-product-engineer-en-madrid-ID-370381682

## About the Role

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

## Description

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 doDesign, implement, and maintain backend services, APIs, and email delivery infrastructureBuild robust integrations with email service providers (SES, SendGrid, Resend) and handle deliverability challengesCreate scalable systems for template management, dynamic content generation, and subscriber managementArchitect data pipelines for analytics, tracking opens/clicks, and managing unsubscribesOwn backend systems end-to-end: architecture, implementation, deployment, monitoring, and optimizationCollaborate with frontend, AI, and product teams to translate ambitious ideas into robust, scalable featuresImplement caching strategies and optimize database queries for sub-second response timesBuild webhook systems for real-time email events and third-party integrationsShape our backend architecture, API standards, and technical strategy as we scaleWhat we're looking forBased in Barcelona (on-site/hybrid working model)5+ years of experience designing, building & scaling backend systems for production productsFluency in Node.js, Python, with strong API design skillsDeep understanding of distributed systems, message queues, caching strategies, and scalability patternsExperience 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 optimizationExperience with event-driven architectures and real-time data processingStrong product instincts: you know how to balance fast delivery with building for the long termFluent English communication skills (written and spoken) - essential for team collaborationPortfolio or GitHub profile with production-level projects is mandatory - Please do not apply without demonstrable workMessage Queues: RabbitMQ, AWS SQS, Redis Pub/SubAI/ML Integration: OpenAI, Anthropic Claude, LangchainWhat We OfferHighly competitive salary - We believe in compensating top talent accordinglyFull-time position based in our Barcelona officeWork with cutting-edge AI technology in a rapidly growing marketHigh impact role in a small, ambitious teamProfessional growth opportunities as we scaleModern office in the heart of Barcelona#J-*****-Ljbffr