Kotlin Backend Engineer for AI Workflow Orchestration

Santex; Ciudad de México; On-site; MXN 1,200,000 - 2,000,000; Full time

Job summary

Santex is hiring a Principal Kotlin/Spring Boot contractor in Mexico to own the execution backbone of a no-code workflow platform. You will design and harden the runtime that executes workflow graphs across HTTP, agent, LLM, and human-review nodes in production.

You’ll implement Temporal workflows and strengthen APIs, ensuring durability, retries, idempotency, and safe recovery across a multi-module service landscape. Advanced English required.

Qualifications

• Strong production Kotlin backend experience.
• Strong Spring Boot experience in distributed systems or platform services.
• Hands-on Temporal experience in production.
• Strong understanding of workflow durability, retries, idempotency, and recovery design.
• Experience with multi-module Gradle codebases and contract-first API design.
• Experience with JPA/Hibernate and PostgreSQL.
• Experience with Docker Compose/Test containers integration testing.
• Comfort debugging multi-service systems with mixed Kotlin and Python components.
• Experience with observability tools like Micrometer.
• Experience with contract-first development.
• Advanced English is required for this position.

Responsibilities

• Design and harden the Kotlin/Spring Boot runtime that executes workflow graphs reliably in production.
• Implement and improve Temporal.io workflows, activities, signals, queries, retries, and recovery paths.
• Strengthen contract-first APIs and shared contracts.
• Own failure-mode thinking across distributed execution retries, idempotency, partial failure, replay safety, pause/resume, and graceful degradation.
• Work across node types, including HTTP, agentic tool-calling, LLM, and human-in-the-loop review nodes.
• Improve integration coverage using Test containers and layered Docker Compose profiles.
• Collaborate closely with Composer and AI/KB teams on execution semantics and runtime behavior.
• Write clear operational documentation and runbooks for a reliability-critical service.

Skills

Kotlin

Spring Boot

Temporal

Contract-first API design

Gradle

PostgreSQL

Docker Compose

Test containers

Observability (Micrometer)

English (Advanced)

Distributed systems

Python components

Auth/OAuth2/JWT

Tools

Docker Compose

Testcontainers

Job description

Santex is hiring a Principal Kotlin/Spring Boot contractor in Mexico to own the execution backbone of a no-code workflow platform. You will design and harden the runtime that executes workflow graphs across HTTP, agent, LLM, and human-review nodes in production.

You’ll implement Temporal workflows and strengthen APIs, ensuring durability, retries, idempotency, and safe recovery across a multi-module service landscape. Advanced English required.