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

Tech · Barcelona (Híbrido)

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📍 Barcelona (Hybrid) 4 days in-office, 1 day remote

đź“„ Full-time

🏢 Remuner, a fast-growing B2B SaaS company in the RevOps tech space


:estrella2: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.


:maletĂ­n: What You’ll Do

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 â€“ Fridays from 9:00–15:00 remote, plus six additional remote days per quarter.
  • Flexible Working Hours â€“ Shape your schedule with manager's approval to match your productivity.
  • AI-Native Culture â€“ Opportunity to work on real AI problems (not just demos)
  • Growth opportunities as the company scales internationally
  • Young, dynamic, and multicultural team
  • Office Comforts â€“ Fresh fruit, coffee, and snacks to keep you fueled.
  • Free Lunch  â€“ From Monday to Thursday enjoy free in-office lunch catering
  • Flexible Compensation â€“ Tax-advantaged spending on transport, restaurants, bars, kindergarten services, plus private health insurance options.

Requisitos

🎯What We’re Looking For

Must-have

  • 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