Full-Stack Software Engineer (Principal) Friday Systems builds AI that allows industrial robots to adapt to dynamic warehouse environments.
We focus on high-throughput palletizing and related logistic tasks, by building distributed, cloud-native systems where reliability and scalability are non-negotiable.
Tiny team, zero bureaucracy, direct impact, salary + equity.
THE ROLE Take end-to-end ownership of our platform: Design distributed systems, build backend (80%) and frontend (20%) services, manage cloud infrastructure and ensure quality through testing and reviews.
You’ll collaborate with founders to turn business strategy into technology that scales.
YOU WILL - Design, implement, and maintain distributed systems and applications with a strong focus on scalable architecture and design patterns.
- Build and deploy backend services in Java and contribute to projects in Python or C++ when required.
- Develop and maintain RESTful APIs and web frontends using Angular.
- Own infrastructure: Containerize services with Docker, automate operations with Bash scripting, and deploy to Cloud environments (AWS) with CI/CD best practices.
- Manage databases, ensuring reliability, performance, and proper data modeling.
- Guarantee software quality by writing comprehensive tests, performing code reviews, and ensuring adherence to best engineering practices.
- Collaborate with the Leadership Team to ensure product excellence and alignment with business strategy.
Forge strong relationships with clients, effectively translating their needs into unique technology solutions.
- Build and nurture a high-performing team by attracting top talent.
Provide mentorship and leadership to foster a culture of quality and innovation.
YOU HAVE - Track record in software engineering, architecture and design patterns.
8+ years of development experience, with at least 5 years in a senior or lead role.
- Strong background developing and maintaining applications in Java and Spring framework (this is a must requirement).
Working knowledge of Python and/or C++ is a strong advantage.
- Hands‑on experience developing modern web frontends with Angular.
- Experience with Docker, Bash scripting, Linux environments, and network fundamentals for real‑world production systems.
- Solid understanding of databases (SQL and NoSQL) and ability to make architectural decisions, balancing performance and scalability.
- Strong experience with cloud platforms, ideally AWS, including deployment, scaling, and monitoring of services.
- Experience in testing methodologies (unit, integration, end‑to‑end) and commitment to high‑quality code.
HIRING PROCESS - Deep technical session with the Dev.
Team on your past work (no LeetCode, no homework) - Two one‑hour “Traits & Skills” conversations with our two other Co‑founders.
- Meet the team & offer
Seniority level Mid‑Senior level
Employment type Full‑time
Job function Engineering and Information Technology
Industries Technology, Information and Internet
Madrid, Community of Madrid, Spain
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