Sr. Software Engineer – Backend Engineering (Core) / Integrations

Ontrac Solutions • Chicago, IL

2d

About The Position

We are seeking a highly skilled and experienced Senior Software Engineer (Backend / Integrations) to join a contractor program supporting a critical customer engagement: a state government professional licensing and regulatory compliance platform built on Google Cloud. This role is ideal for a senior backend engineer with deep Java experience who builds event-driven microservices and has integrated with external systems over REST, SOAP, and SFTP. The successful candidate will build core platform services and the external integration layer, working closely with the client technical lead, the mobile and frontend engineers, and customer stakeholders to ensure project success from initial definition through final delivery.

Requirements

• 8+ years of professional backend engineering experience with Java and Spring Boot
• Production delivery experience on Google Cloud Platform
• Bachelor's degree in Computer Science or equivalent practical experience
• Java 21 and Spring Boot 3.x microservice development
• PostgreSQL, including schema design, indexing, and versioned migrations
• GCP serverless services: Cloud Run, Pub/Sub, Cloud Tasks, Cloud Workflows, Cloud Scheduler
• Event-driven architecture and messaging patterns (idempotency, retries, dead-letter handling)
• External system integration over REST, SOAP, SFTP, and webhooks
• API security with OAuth 2.0 / OIDC and JWT
• Automated testing (JUnit, integration tests) and CI/CD

Nice To Haves

• Workflow engines (Flowable, BPMN) and business rules engines
• AlloyDB, BigQuery
• Payment processing integrations
• Experience in government or regulated environments (FIPS, CJIS, HIPAA)
• Google Cloud Professional certifications

Responsibilities

• Design and implement Java 21 / Spring Boot microservices on Cloud Run (licensing, case management, payments, documents, notifications)
• Implement PostgreSQL (AlloyDB) persistence, including row-level data isolation and search indexing
• Build asynchronous event flows on Pub/Sub and Eventarc
• Implement scheduled and timer-driven processing with Cloud Tasks and Cloud Scheduler (renewal reminders, expiration sweeps, reconciliation)
• Author Cloud Workflows orchestrations for multi-service pipelines
• Build integrations with external state and federal systems over REST, SOAP, SFTP, and webhooks
• Implement payment flows, including hosted payment page integration and settlement reconciliation
• Meet platform security and compliance requirements for encryption and data isolation
• Deliver unit and integration test coverage, participate in code reviews, and support CI/CD deployment of owned services

What This Job Offers

• Job Type: Full-time
• Career Level: Senior