Principal Back-End Engineer (Must: Kotlin & Spring Boot)
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Before you apply
LocationArgentina, Argentina / Perú; México City
Also inMexico (CDMX); Mexico (Guadalajara); Peru
Typecontract
SeniorityLead
DepartmentOperation/Development
Company size10+ people
PostedAug 21, 2026 · 2mo ago
Verified live2d ago
At a glanceSummarised by Seekless from the posting.
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
Experience with contract-first API design
Experience with JPA/Hibernate
Experience with PostgreSQL
Experience with Docker Compose integration testing
Experience with 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
Experience with DAG/workflow/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 auth/token provider abstractions, OAuth2/JWT, or cached token acquisition
Experience writing operational docs, runbooks, and reliability guidance
Skills
Kotlin
Spring Boot
Temporal.io
Gradle
JPA/Hibernate
PostgreSQL
Docker Compose
Test containers
Python
Micrometer
FastAPI
OAuth2
JWT
About the company
Santex is a global Certified B technology company as well as one of North America’s fastest-growing companies, according to the Inc. 5000. It’s present in 18 countries and over 100 cities, and headquartered in Argentina with offices in the United States, Mexico, and Peru.
Its two service lines — AI Tech Consulting and AI-Optimized Engineering — help organizations comprehensively adopt technology, expand their capabilities, and improve business outcomes at scale.
The same approach defines its culture: Santex has 80.4% employee engagement (global average: 21%), 8% annual turnover (tech sector: 20–25%), 9,369 training hours invested in 2025 — more than double the global average —, and a 26.5% year-over-year reduction in carbon footprint, achieving carbon neutrality through offsetting.
Santex. A company with purpose and judgment. Yes, it’s possible.
Legal
We are an Equal Opportunity Employer and are committed to fostering an inclusive and diverse workplace. We do not discriminate on the basis of race, color, religion, sex, gender identity or expression, sexual orientation, national origin, age, disability, veteran status, genetic information, or any other characteristic protected by applicable law. All qualified applicants will receive consideration for employment without regard to any of these factors. We strongly encourage candidates from all backgrounds to apply.
About the role
We’re hiring a Principal Kotlin/Spring Boot contractor to help own the execution backbone of a no-code workflow platform. This is not a simple CRUD service. The Orchestrator runtime is a multi-module system that receives workflow execution requests, persists durable state with Temporal, coordinates graph execution, integrates HTTP, agent, LLM, and human-review nodes, and safely executes increasingly AI-generated workflow graphs. You’ll join the squad responsible for the runtime layer that everything else depends on.
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.
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.
Strong Pluses:
• Experience with DAG/workflow/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 auth/token provider abstractions, OAuth2/JWT, or cached token acquisition.
• Experience writing operational docs, runbooks, and reliability guidance.
📍Location: Argentina / Mexico (CDMX or Guadalajara) / Peru