Senior AI / LLM engineering or senior backend & cloud roles on AWS: RAG and agent systems, serverless architectures, Python/FastAPI and TypeScript/React. Fully remote with full location independence (B2B contract or employment).
Looking for a job
Nicolás Japas
@nicolsjapas
Senior AI & full-stack engineer building production LLM systems (RAG, agents) and serverless backends on AWS. German & Argentine citizen.
PortugalWhat I'm looking for
Senior AI Engineer and full-stack developer with a backend and cloud focus. I build production LLM systems end-to-end: retrieval (hybrid search, chunking, re-ranking, metadata filtering), agent orchestration with LangGraph, and the FastAPI/React layers that expose them to users. Currently delivering the retrieval, ingestion, agent and application layers of a live conversational AI product for an enterprise client on AWS (Bedrock, OpenSearch Serverless, Lambda). Previously built event-driven serverless infrastructure (Lambda, EventBridge, API Gateway, DynamoDB, CDK) for a B2B SaaS platform serving about 30 companies across Europe, and productionized ML forecasting models on SageMaker. I also fine-tune small open-weight models (LoRA) for on-device use and run Japas Audio, a commercial audio software label. AWS Solutions Architect Associate, Terraform Associate and Neo4j certified. Based in Lisbon, German and Argentine citizen (no visa required in the EU). Languages: Spanish (native), English (C2), German (B2), Portuguese (A2).
Experience
Work history, roles, and key accomplishments
Current
Build and tune the retrieval layer of a production conversational AI assistant: hybrid search on OpenSearch Serverless, Bedrock Titan v2 embeddings, re-ranking. Deliver the full stack: React SPA, FastAPI API on AWS Lambda, and a LangGraph agent with tool calling. Test-driven, with monitoring and QA/security review.
JA
Current
Founder & AI Engineer
Japas Audio
Nov 2025 - Present (11 months)
Built and released Sequoia, a free VST3 MIDI sequencer (C++/JUCE) that writes melodies from text with a LoRA fine-tuned Qwen3-0.6B running offline via llama.cpp, incl. data pipeline and LLM eval. Released Digital Decay, a commercial VST plugin (japasaudio.com). Built a self-hosted LLM inference stack (Modal, vLLM) with an OpenAI-compatible API.
BI
Full-Stack Engineer, Backend & Cloud
Brother ISM
Jul 2023 - Oct 2025 (2 years 3 months)
Built core backend services for Myze, a B2B SaaS platform for industrial print-on-demand serving ~30 European companies: event-driven serverless infrastructure (Lambda, EventBridge, API Gateway, DynamoDB), multi-tenant OpenAPI REST APIs with Cognito/JWT auth, Shopify and shipping integrations, plus React/TypeScript features and Pytest/Jest/Cypress/Playwright tests.
DA
Software Engineer
DataZoo
Jun 2021 - Jun 2023 (2 years)
Productionized ML forecasting models via SageMaker-backed APIs, bridging data science and production for industrial time-series applications. Built interactive tooling and processing pipelines (DuckDB, Datashader) and custom JupyterLab visualization components (Plotly) for large, high-density datasets.
Education
Degrees, certifications, and relevant coursework
UU
Universidad Nacional de las Artes (UNA)
Licenciatura (Master of Arts), Musical Arts (Composition)
Tech stack
Software and tools used professionally
Availability
Looking for a job
Location
Portugal
Germany
ArgentinaWebsite
japasaudio.comPortfolio
nicojapas.github.io/portfolioSalary expectations
100k-130k EUR
Social media
Job categories
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