Senior Backend Engineer (AI SaaS)

TL;DR

Senior Backend Engineer (AI SaaS): Building and scaling AI-driven agent platforms with an accent on high-performance architecture, database optimization, and production reliability. Focus on designing scalable systems, integrating AI models into production, and mentoring the engineering team to deliver high-impact product features.

Location: Must be eligible to work in Spain. Hybrid model with flexibility to work remotely or from the Barcelona office.

Company

hirify.global is an AI-first SaaS company building AI Agents that help businesses deliver exceptional experiences to their users.

What you will do

• Partner with Product to turn business goals into clear technical strategies and plans.
• Design and evolve systems that scale with traffic, data complexity, and AI-driven use cases.
• Write clean, maintainable code while continuously improving practices and quality.
• Mentor and support the team, leading by example in code, reviews, and collaboration.
• Manage technical debt by making it visible, measurable, and actionable.
• Safeguard delivery pace by reducing blockers and keeping flow sustainable.

Requirements

• Fluent in English and Spanish.
• Eligibility to work in Spain.
• Experience with modern backend stacks like Node.js, TypeScript, and Python.
• Proficiency with relational databases (Postgres, MySQL) and NoSQL systems (Redis, MongoDB).
• Proven experience building web applications at scale and working with distributed systems.
• Hands-on experience operating services in production environments with cloud infrastructure (GCP, AWS, or Azure).

Nice to have

• Experience with AI/ML APIs, vector databases, or data pipelines.
• Experience with Domain-Driven Design.

Culture & Benefits

• Hybrid work model with flexible working hours.
• 26 paid days off per year plus birthday leave.
• Annual budget for training and professional development.
• Flexible compensation plan through Cobee.
• English and Spanish lessons provided.
• Transportation ticket and team-building activities.

Hiring process

• HR interview (40 min).
• Interview with the Director of Engineering (60 min).
• Technical interview with the Tech Team (60 min).
• Meeting with the Founders (20 min).