Senior Backend Developer (Delta Team) - Barcelona

Following our successful expansion into the U.S. and continued growth across Europe, we are seeking a Senior Backend Developer (Delta Team) to help drive our Operations function from our Barcelona hub.

This person will play a critical role in building Biorce's internal software infrastructure, starting with our CRM Leadro. Leadro is Biorce's in-house AI-native CRM and the system of record for our commercial engine: LLM-driven workflows, data orchestration across our GTM stack, and deep third-party integrations. You'll own backend systems end to end and shape the architecture as we scale.

The ideal candidate has 6+ years in software development and architecture, with real ownership of production systems. Someone with a track record of taking ambiguous problems from design through documentation to delivery, and experience mentoring engineers and driving technical decisions. This person should be able to own backend systems end to end and help the team deliver fast without breaking things.

• Design, build, and own Leadro's core backend services, from data models to APIs
• Build and maintain deep third-party integrations across our GTM stack
• Ship LLM-powered features: agentic workflows, enrichment pipelines, and intelligent automation
• Set technical direction for the backend, lead design reviews, and raise the bar on code quality through rigorous code review and clean code practices
• Mentor engineers and help the team deliver fast without breaking things

✅ Must-haves

• 6+ years in software development and architecture, with real ownership of production systems
• A track record of taking ambiguous problems from design through documentation to delivery
• Experience mentoring engineers and driving technical decisions
• CS degree or equivalent practical experience
• Expert-level Node.js and NestJS in production backend systems, including TypeScript
• Strong data architecture skills: complex data modeling, relational databases (PostgreSQL, MySQL), and warehouses like BigQuery
• API design and development (REST, GraphQL), including building and maintaining third-party integrations
• Hands-on experience shipping LLM-based workflows or agentic systems
• Modern engineering practices: code review culture, clean code principles, CI/CD, Docker and Docker Compose, and automated testing
• Experience with major cloud providers (GCP, AWS, Azure) - GCP is our primary platform
• Proficiency with tools like Confluence and Jira

✨ Nice-to-Haves

• Distributed and event-driven patterns: Redis, RabbitMQ, Kubernetes, serverless
• Authentication, authorization, and identity management (OAuth, SSO, RBAC)
• Python
• Experience with React, HTML/CSS, Bootstrap is a plus.
• Prior work on data-heavy SaaS (CRM, RevOps, or analytics tooling)

• A dynamic work environment with an international team, where collaboration and diversity thrive.
• Work alongside top talent, united by a shared purpose and committed to making a real impact.
• Get equipped with a MacBook to enhance your productivity and work experience.
• Benefits package designed to support you and your family's overall well-being.
• Comprehensive medical, dental, and vision insurance options beginning on the first of the month following hire.
• Hybrid work model offering flexibility to balance your professional and personal life.
• Company events to celebrate achievements and enjoy time together.
• Our office is pet-friendly! You'll likely be greeted by a few wagging tails upon arrival.

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