Celara

Fullstack Engineer JR (Backend + AI)

Celara · Buenos Aires, Argentina
Buenos Aires, Argentina Contract Closed
Applications are closed for this role. It was originally posted 2026-06-09. It’s no longer accepting applicants — see roles Celara is still hiring for →, or browse the live openings below.
Type
Contract
Experience
0-2 yr

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.

Build API endpoints — write DRF serializers and viewsets serving data to a React frontend, working with complex models (JSONFields, custom managers, mixin patterns).

Extend AI agent capabilities — add new tools to agents; work on context engineering, and retrieval systems.

Write async task workers — build and debug distributed RQ worker logic covering document parsing (PDF, Excel, PowerPoint) and LLM inference pipelines.

Improve test coverage — write pytest tests with real database fixtures, mock external APIs, and catch N+1 query issues.

Ship frontend features — build React/TypeScript components wired to TanStack Query, styled with SCSS Modules; work with rich text, interactive charts, and virtualized tables.

Debug AI output — diagnose and fix hallucinations and retrieval failures in agent pipelines.
Required

Solid Python fundamentals — classes, tracebacks, data structures, without over-relying on AI autocomplete.

Familiarity with web APIs: HTTP methods, JSON serialization, request/response cycles.

Comfort with Git: branching, rebasing, resolving merge conflicts.

Experience with at least one relational database: SQL queries and basic schema design.

Comfortable working with AI-based tools like Cursor, Claude Code, etc.

Genuine curiosity about AI/ML — LLM API usage, a RAG pipeline, or serious experimentation beyond chatting with ChatGPT.

Ability to debug AI-generated code — shipping broken AI output is worse than writing it yourself.

Nice to Have

Django or Flask experience.

React/TypeScript exposure, even from a personal project.

Familiarity with Docker and containerized development.

Experience with vector databases, embeddings, or LLM orchestration (LangChain, LangGraph, etc.).

A deployed project you can demo — valued more than GPA.

Tech Stack

Backend: Python 3.13, Django 5.2, Django REST Framework, PostgreSQL, Redis.

AI/ML: OpenAI, Anthropic & Google LLM APIs; LangChain + LangGraph; sentence-transformers; RAGAS.

Data: NumPy, Pandas, Polars, scikit-learn, XGBoost, PyMC, Prophet, Plotly.

Frontend: React 19, TypeScript, Vite, Ant Design, TanStack Query, SCSS Modules.

Infra: Docker, GitHub Actions CI/CD, AWS (S3, ECR), MinIO, Sentry, RQ.

Mentorship and hands-on learning alongside senior engineers.

Opportunity to ship production code from day one on a real AI platform.

A culture that embraces AI tooling, rigorous testing, and continuous tech innovation.

ReactLLMTypeScriptPythonDjangoFlask
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