Senior FastAPI Engineer for AI APIs & Data Pipelines

Newcode.ai; Dublin; On-site; EUR 100,000 - 170,000; Full time

Benefits offered by this job

Flexible work hours

English-speaking team

Career growth

Job summary

Newcode.ai is seeking an experienced backend engineer to own the APIs and services powering our AI features in production. You will design scalable architecture, handle retrieval, orchestration, and streaming, and ensure secure, reliable operation at scale.

You’ll work with a small, fast-moving team in Ireland, making early architectural decisions and shaping our product's backend foundations for real-world use cases.

Qualifications

• 7+ years building backend systems in production; depth matters.
• Experience with reliable, scalable systems and failure modes.
• Interest in LLM-powered systems, RAG, tool-calling, agents.
• Familiarity with AI coding tools (Claude Code, Cursor, Copilot).
• Comfortable in a fast-moving startup that pivots quickly.

Responsibilities

• Design and build the APIs and services that run our products.
• Develop AI plumbing—including retrieval, orchestration, tool‑calling, response streaming, and evaluation of output quality.
• Maintain reliability of async and distributed work such as document ingestion, embeddings, and long‑running jobs on Redis.
• Integrate with clients’ existing systems (email, document stores) ensuring they perform under load.
• Implement robust data security and isolation for confidential material.

Skills

Backend development

API design

Distributed systems

Python

LLM tooling

Tools

PostgreSQL

Redis

FastAPI

SQL

LangChain

LlamaIndex

WebSocket

SignalR

Job description

Newcode.ai is seeking an experienced backend engineer to own the APIs and services powering our AI features in production. You will design scalable architecture, handle retrieval, orchestration, and streaming, and ensure secure, reliable operation at scale.

You’ll work with a small, fast-moving team in Ireland, making early architectural decisions and shaping our product's backend foundations for real-world use cases.