Senior Kotlin/Spring Boot Engineer

Solution IT Inc. is looking for Senior Kotlin/Spring Boot Engineer for one of its clients in Phoenix, AZ

Job Title: Senior Kotlin/Spring Boot Engineer

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 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.

Required Skills:

• 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

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.

Work Site: Phoenix, AZ (Day 1 onsite)

Duration: Long term

Expected Start Date: Immediate

Number of Positions: 01

Please send your responses back to View email address on us.fitly.work

Thanks

Recruiting Team

SOLUTION IT INC

Work: View phone number on us.fitly.work / Extn 139 / 150

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Solution IT, Inc, 60E Concord St, Wilmington, MA 01887 Phone: View phone number on us.fitly.work Fax: View phone number on us.fitly.work