Fullstack Engineer JR (Backend + AI) (NW - FS - 20260609)
Posted 27 days ago
Role Overview
We are looking for a motivated Junior Fullstack Engineer with a strong backend focus who is eager to build great products and grow alongside a team that embraces cutting-edge technology. You write clean, thoughtful code, care about building reliable systems, and are genuinely curious about how AI development tools (like Cursor or Claude) can make you a faster, better developer from day one.
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Build API endpoints — write DRF serializers and viewsets serving data to a React frontend, working with complex models (JSONFields, custom managers, mixin patterns).
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Extend AI agent capabilities — add new tools to agents; work on context engineering, and retrieval systems.
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Write async task workers — build and debug distributed RQ worker logic covering document parsing (PDF, Excel, PowerPoint) and LLM inference pipelines.
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Improve test coverage — write pytest tests with real database fixtures, mock external APIs, and catch N+1 query issues.
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Ship frontend features — build React/TypeScript components wired to TanStack Query, styled with SCSS Modules; work with rich text, interactive charts, and virtualized tables.
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Debug AI output — diagnose and fix hallucinations and retrieval failures in agent pipelines.
Required
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Solid Python fundamentals — classes, tracebacks, data structures, without over-relying on AI autocomplete.
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Familiarity with web APIs: HTTP methods, JSON serialization, request/response cycles.
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Comfort with Git: branching, rebasing, resolving merge conflicts.
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Experience with at least one relational database: SQL queries and basic schema design.
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Comfortable working with AI-based tools like Cursor, Claude Code, etc.
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Genuine curiosity about AI/ML — LLM API usage, a RAG pipeline, or serious experimentation beyond chatting with ChatGPT.
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Ability to debug AI-generated code — shipping broken AI output is worse than writing it yourself.
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Django or Flask experience.
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React/TypeScript exposure, even from a personal project.
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Familiarity with Docker and containerized development.
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Experience with vector databases, embeddings, or LLM orchestration (LangChain, LangGraph, etc.).
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A deployed project you can demo — valued more than GPA.
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Backend: Python 3.13, Django 5.2, Django REST Framework, PostgreSQL, Redis.
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AI/ML: OpenAI, Anthropic & Google LLM APIs; LangChain + LangGraph; sentence-transformers; RAGAS.
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Data: NumPy, Pandas, Polars, scikit-learn, XGBoost, PyMC, Prophet, Plotly.
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Frontend: React 19, TypeScript, Vite, Ant Design, TanStack Query, SCSS Modules.
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Infra: Docker, GitHub Actions CI/CD, AWS (S3, ECR), MinIO, Sentry, RQ.
Nice to Have
Tech Stack
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Mentorship and hands-on learning alongside senior engineers.
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Opportunity to ship production code from day one on a real AI platform.
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A culture that embraces AI tooling, rigorous testing, and continuous tech innovation.
ALUMÍNIOS CESAR, S.A., or CELAR as it is also known, is an industrial company older than 25 years, where approximately 100 people work. It has implemented a Quality Certification System, according to the NP EN ISO 9001:2000. WHAT DO WE DO It produces and trades kitchenware, being specialized in non-stick, such as Weilburger and Akzo Nobel. The products are sold with the CELAR trademark or, in special cases, with the customers' own brand. WHAT DO WE OFFER Our main goal is the customers' satisfaction, in all its aspects, not only by offering a wide variety of high quality products with competitive prices, but also by having both an efficient delivery service and a post-sales assistance.
Key team members

Margarita María Yepes Orrego

Cristina Ferreira

Frederico Burnay

Filipe Azevedo
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