Senior Software Engineer – Backend, API Engineering

Job not on LinkedIn

🕒 September 11

🌽 Illinois – Remote

🌽 Illinois – Remote

💵 $110 - $120 / hour

⏳ Contract/Temporary

🟠 Senior

🔙 Backend Engineer

👻 Ghost score 20%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Ontrac Solutions

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2010

🤖 Artificial Intelligence

💼 Consulting

🤝 B2B

Artificial Intelligence • Consulting • B2B

Ontrac Solutions is an AI-first technology services firm that helps organizations design, implement, and scale AI-driven systems, cloud architectures, and enterprise platform integrations. They provide AI strategy and generative AI implementation (including RAG and intelligent search), cloud migration and optimization (multi-cloud architecture, Kubernetes, Terraform, GitOps, and FinOps), data and integration engineering, CRM/CMS/e-commerce platform development, and embedded technical talent / staff augmentation to move AI from experimentation into production. With innovation hubs in Chicago and Karachi, Ontrac focuses on delivering production-ready AI and cloud solutions that drive measurable business outcomes.

📋 Description

• Design and implement Java 21 / Spring Boot microservices on Cloud Run for licensing, applications and renewals, case management, payments, documents, and notifications • Own the platform API surface; specify it in OpenAPI, maintain stable contracts for mobile, frontend, and integration teams, and version changes without breaking consumers • Implement PostgreSQL (AlloyDB) persistence, including row-level data isolation, search indexing, and migration strategy • Build asynchronous event flows on Pub/Sub and Eventarc and publish domain events for other services and the integration layer • Implement scheduled and timer-driven processing with Cloud Tasks and Cloud Scheduler, including renewal reminders, expiration sweeps, and reconciliation • Implement authentication and authorization across the API surface, including public applicant access and internal staff roles • Implement payment flows, including hosted payment page integration and settlement reconciliation • Meet platform security and compliance requirements for encryption, auditability, and data isolation • Deliver unit and integration test coverage, participate in code reviews, and support CI/CD deployment of owned services • Work closely with the client technical lead, integration engineers, mobile engineers, and frontend engineers 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 • API design and ownership: REST, OpenAPI specification, versioning, pagination, error contracts, backward compatibility • PostgreSQL, including schema design, indexing, query tuning, and versioned migrations • GCP serverless services: Cloud Run, Pub/Sub, Cloud Tasks, Cloud Scheduler • Event-driven architecture and messaging patterns (idempotency, retries, dead-letter handling) • API security with OAuth 2.0 / OIDC and JWT, including role- and attribute-based authorization • Automated testing (JUnit, integration tests) and CI/CD • Observability of owned services: structured logging, metrics, tracing, SLOs • Building APIs consumed by external partners, agencies, or public-facing applications • AlloyDB, BigQuery • Payment processing integrations and settlement reconciliation • GraphQL or gRPC alongside REST • Performance and load testing of high-traffic public services • Google Cloud Professional certifications