Full Stack Developer ID63542

Posted Yesterday
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Madrid, Comunidad de Madrid, ESP
In-Office
Junior
Software
The Role
Build and integrate LLM-powered features across frontend and backend. Develop React components and extend Python backend services, work directly with LLM APIs (Claude, OpenAI), collaborate with product, QA, and engineering teams across EST overlap, and contribute to design of scalable AI-driven solutions.
Summary Generated by Built In
AgileEngine is an Inc. 5000 company that creates award-winning software for Fortune 500 brands and trailblazing startups across 17+ industries. We rank among the leaders in areas like application development and AI/ML, and our people-first culture has earned us multiple Best Place to Work awards.

WHY JOIN US
If you're looking for a place to grow, make an impact, and work with people who care, we'd love to meet you!

ABOUT THE ROLE
We are looking for a Full Stack Developer to build and integrate LLM-powered features across frontend and backend systems. You will develop React components, extend Python backend services, and work directly with LLM APIs — including Claude, OpenAI, or similar — to deliver AI-driven product functionality. The role requires close collaboration with product, QA, and engineering teams with active overlap in EST hours.

WHAT YOU WILL DO
- Develop and integrate LLM-based functionality, including prompt engineering, API-based model usage, and AI workflows;
- Build and maintain React-based frontend components;
- Develop and extend Python backend services, including APIs, integrations, and data processing;
- Collaborate closely with product, QA, and engineering teams in overlapping EST hours;
- Participate in design discussions and contribute to scalable, maintainable solutions.

MUST HAVES
- Commercial experience with LLMs, preferably Claude, OpenAI APIs, similar APIs, or custom model integration;
- 1+ year of React experience with hooks, state management, and component-driven development;
- 1+ year of Python experience in API development and backend logic;
- Experience working in distributed teams with active collaboration;
- Upper-intermediate English level.

NICE TO HAVES
- Experience with FastAPI or similar frameworks;
- Exposure to AI evaluation, prompt testing, or AI quality considerations;
- Prior work on data-heavy or AI-driven products.

PERKS AND BENEFITS
- Professional growth: Mentorship, TechTalks, and personalized growth roadmaps.
- Competitive compensation: USD-based pay with education, fitness, and team activity budgets.
- Exciting projects: Modern solutions with Fortune 500 and top product companies.
- Flextime: Flexible schedule with remote and office options.

Meet Our Recruitment Process
Application → Coding Challenge → Video Interview → Technical Interview or Hiring Manager Interview
Each step helps us understand your skills and overall fit.
If it’s a match, you’ll receive an offer.

Skills Required

  • Commercial experience with LLMs (Claude, OpenAI APIs, or similar)
  • 1+ year React experience (hooks, state management, component-driven development)
  • 1+ year Python experience in API development and backend logic
  • Experience working in distributed teams with active collaboration
  • Upper-intermediate English level
  • Experience with FastAPI or similar frameworks
  • Exposure to AI evaluation, prompt testing, or AI quality considerations
  • Prior work on data-heavy or AI-driven products
Am I A Good Fit?
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The Company
McLean, VA

What We Do

AgileEngine is a privately held company established in 2010 that builds dedicated teams of designers and developers. We turn good ideas into awesome software that people actually want to use. Some of the biggest names and the hottest startups around the world chose us to build their tech.

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