Senior Back-End Engineer (Kotlin & Spring Boot)

Location: Argentina, Peru, or Mexico

Company

hirify.global is a global Certified B technology company providing AI Tech Consulting and AI-Optimized Engineering services, headquartered in Argentina with offices in the United States, Mexico, and Peru.

What you will do

• Design and harden the Kotlin/Spring Boot runtime for reliable production execution of workflow graphs.
• Implement and improve Temporal workflows, activities, signals, queries, retries, and recovery paths.
• Strengthen contract-first APIs and shared contracts.
• Design for distributed execution failure modes, including idempotency, partial failure, replay safety, pause/resume, and graceful degradation.
• Support HTTP, agentic tool-calling, LLM, and human-in-the-loop workflow nodes while collaborating with Composer and AI/KB teams.
• Improve integration coverage and maintain operational documentation and runbooks for a reliability-critical service.

Requirements

• Strong production experience with Kotlin backend development and Spring Boot in distributed systems or platform services.
• Hands-on production experience with Temporal and a strong understanding of workflow durability, retries, idempotency, and recovery design.
• Experience with multi-module Gradle codebases, contract-first API development, JPA/Hibernate, and PostgreSQL.
• Experience with Docker Compose and Testcontainers for integration testing.
• Ability to debug multi-service systems containing Kotlin and Python components, with experience using observability tools such as Micrometer.
• Advanced English is required; candidates must be located in Argentina, Peru, or Mexico.

Nice to have

• Experience with DAG, workflow, or orchestration engines.
• Experience with AI, LLM, agent runtimes, or other non-deterministic execution systems.
• Familiarity with FastAPI-based workers and cross-language integration.
• Experience with OAuth2/JWT, authentication and token-provider abstractions, or cached token acquisition.
• Experience writing operational documentation, runbooks, and reliability guidance.

Culture & Benefits

• Work in a global organization present in 18 countries and more than 100 cities.
• Join an AI-focused technology services environment spanning consulting and engineering.
• Access ongoing training and professional development initiatives.
• Work in an inclusive and diverse equal-opportunity environment.
• Participate in sustainability-focused initiatives, including carbon-neutral operations through offsetting.