Software Engineer (Python, AI & Data) - B2B SaaS

Barcelona (Hybrid) 4 days in-office, 1 day remote, We're looking for a senior engineer who goes beyond just shipping features - someone who understands the business behind the product, challenges requirements, and builds solutions that actually solve problems. You will be part of a small, highly collaborative team with strong ownership and direct impact on the product.

• Design and implement backend systems and APIs (Python, FastAPI/Django)

• Build and improve frontend features (Vue.js)

• Work with data-intensive systems and optimize performance (SQL/NoSQL)

• Design and implement AI-powered features and workflows

• Work on orchestration of AI agents and integrations with LLMs

• Contribute to architecture and technical decisions

• Review code and uphold engineering standards

• Collaborate closely with product and business stakeholders

• Translate business problems into technical solutions

• Take ownership beyond implementation, understanding impact and trade-offs

• Own features end-to-end: from design to deployment and monitoring You'll enjoy this role if

• You like working on complex business logic, not just CRUD

• You're comfortable dealing with messy real-world data

• You care about performance, scalability, and clean systems

• You're excited about building real AI features, not demos

• You naturally think in terms of problems, not tickets

• You want to understand why things are built, not just how How we work

• Small team, high ownership, low bureaucracy and real impact on the product

• Pragmatic engineering culture (we optimize for impact, not over-engineering)

• Direct exposure to product decisions and customers What we offer

• Hybrid Work Policy - Fridays from 9:00-15:00 remote, plus six additional remote days per quarter.

• Flexible Working Hours - Shape your schedule with manager's approval to match your productivity.

• AI-Native Culture - Opportunity to work on real AI problems (not just demos)

• Growth opportunities as the company scales internationally

• Young, dynamic, and multicultural team

• Office Comforts - Fresh fruit, coffee, and snacks to keep you fueled.

• Free Lunch - From Monday to Thursday enjoy free in-office lunch catering

• Flexible Compensation - Tax-advantaged spending on transport, restaurants, bars, kindergarten services, plus private health insurance options.

• 5+ years of experience as a Software Engineer

• Strong experience with Python

• Experience with FastAPI and/or Django

• Solid experience with JavaScript and Vue.js

• Strong understanding of SQL databases and query optimization

• Experience building production-grade APIs

• Hands-on experience building AI-powered features (LLMs, embeddings, etc.)

• Experience orchestrating AI agents or multi-step AI workflows (LangChain, LangGraph, or similar)

• Strong knowledge of agentic AI workflows (Claude, Codex, etc.), with demonstrated curiosity and continuous learning about the rapidly evolving AI landscape

• Strong product mindset: ability to understand business problems and propose solutions, not just execute tasks

• Ability to work with ambiguity and think end-to-end across systems

• Fluent in English Nice to have

• Experience with AWS (ECS, S3, RDS, etc.)

• Experience with data pipelines or ETL systems

• Frontend performance optimization experience

• Familiarity with CI/CD and modern deployment workflows

• Experience in B2B SaaS environments

Full-time Remuner, a fast-growing B2B SaaS company in the RevOps tech space About Remuner We are a fast-growing B2B SaaS company based in Barcelona, building a data-driven platform that helps companies automate and optimize complex business processes. Our product deals with high volumes of data, non-trivial business logic, and increasingly incorporates AI-driven capabilities to assist users and automate workflows. What You'll Do