Senior Software Engineer (Python, AI & Data) - B2B SaaS
Indexed description
📄 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
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 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
- 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
- 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.
🎯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
- 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
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