Senior Backend Engineer (AI)

TL;DR

Senior Backend Engineer (AI): Building and optimizing robust, scalable backend systems for an intelligent agent platform with an accent on handling context, state, and interactions for LLM-powered agents. Focus on integrating AI agent capabilities with core payment platforms, orchestrating agent workflows, and ensuring high performance and reliability.

Location: Must be based in Barcelona or be willing to relocate to Barcelona. Work visa and relocation support available.

Company

hirify.global is a privately-owned fintech providing innovative, flexible, and easy-to-use payment technologies, currently expanding across Southern Europe and Latin America.

What you will do

• Design and build the backend foundations of hirify.global’s Smart Agent platform.
• Transform ambiguous product ideas and shopper needs into reliable, scalable backend services.
• Orchestrate agent workflows across multiple services, managing context, state, and interactions.
• Integrate intelligent agent capabilities with core platforms safely and efficiently.
• Contribute to architectural decisions with clarity and simplicity.
• Monitor, optimize, and improve production systems, ensuring high performance, availability, and reliability.

Requirements

• 5+ years of experience as a Backend Engineer.
• Experience in production-grade backend systems (Ruby on Rails preferred; Python, Kotlin, Java, Elixir, or JS also valued).
• Strong knowledge of OOP, clean coding, TDD, and agile principles.
• Experience with agentic systems or LLM-powered agents (RAG, workflow orchestration, chatbots).
• English proficiency (B2 required).
• Strong attitude, ownership, and pragmatic mindset.

Nice to have

• Experience scaling backend services to high concurrency and low latency.
• Spanish language skills.

Culture & Benefits

• Secure, reliable, and supportive workplace with freedom to contribute your best.
• Unique, inspiring office environment in Barcelona.
• 23 vacation days + 2 free disposal days/year.
• Flexible working hours and hybrid or remote options.
• Personal budget for professional development.
• Health insurance discounts and flexible compensation plan for transportation, restaurants, and kindergarten.
• Holistic Wellness Program with 34 activities.

Hiring process

• Interview with People Team.
• Meeting with the Hiring Manager.
• Live peer review of your own code.
• Meet the team.