Senior Kotlin/Spring Boot Backend Architect

Santex Group; Argentina; On-site; ARS 242,036,000 - 393,308,000; Full time

Job summary

Santex Group in Argentina seeks a Principal Back-End Engineer specializing in Kotlin and Spring Boot to own the execution backbone of a no-code workflow platform. The role spans complex graph execution, durable state with Temporal, and integration across HTTP, AI/tooling nodes, and human review.

Ideal candidates have strong production Kotlin/backend and Temporal experience, with expertise in distributed systems, API design, and observability.

Qualifications

• Strong production Kotlin backend experience.
• Strong Spring Boot experience in distributed systems or platform services.
• Hands-on Temporal experience in production.
• 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 backend

Spring Boot

Temporal

Distributed systems

Gradle

JPA/Hibernate

PostgreSQL

Docker Compose

Test containers

Observability (Micrometer)

Contract-first API design

English (Advanced)

Tools

PostgreSQL

Docker Compose

Test containers

Gradle

Micrometer

Job description

Santex Group in Argentina seeks a Principal Back-End Engineer specializing in Kotlin and Spring Boot to own the execution backbone of a no-code workflow platform. The role spans complex graph execution, durable state with Temporal, and integration across HTTP, AI/tooling nodes, and human review.

Ideal candidates have strong production Kotlin/backend and Temporal experience, with expertise in distributed systems, API design, and observability.