CareerPlanSign in

Senior Backend Engineer

Barcelona💼 Full-time🗓 2026-09-26 → 2026-09-29

Core

Design and maintain high-performance microservices and event-driven pipelines for a new conversational AI product.

Role type

Senior Backend Engineer (AI/LLM infrastructure)

Builds

Scalable backend services, real-time event pipelines, and LLM tool-calling integrations

Domain

AI & Data, Cloud Infrastructure

Deliverable

production ML models

Required skills

TypeScript, Node.js, Go, Kafka, PostgreSQL, AWS, Kubernetes, REST/gRPC, Redis, OpenSearch

Preferred skills

LLM application development, tool/function calling, debugging non-deterministic AI systems

Technologies

TypeScript, Node.js, Go, Kafka, AWS, Kubernetes, PostgreSQL, Redis, OpenSearch

Responsibilities

Design and build high-performance microservices and APIs; Architect event-driven and asynchronous streaming workflows; Model and optimize relational and search data stores; Deploy and scale containerized applications on AWS; Instrument services with observability tools; Establish service boundaries and testing standards

Seniority

Senior, hands-on IC

Sourced via adzuna · Listed on CareerPlan, which tracks 853,000+ jobs from 20+ sources.