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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Sr. Software Engineer - Backend / API Engineering - **Company:** Ontrac Solutions - **Location:** United States (Remote available) - **Experience:** Expert - **Salary:** $228,800.0 - $249,600.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Application Services, Automation of Tests, BigQuery, Cloud Computing, Code Review, Continuous Integration, Federal Information Processing Standards (FIPS), Junit, PostgreSQL, Load Testing, OAuth, OpenID, Query Optimization, Migration Manager, Management of Software Versions, Openapi, Data Logging, Google Cloud, Cloud Platform System, Spring-boot, Software Security, Indexer, Backend, Event Driven Architecture, Integration Tests, Information Technology, Google Cloud Functions, Graphql, Front End Software Development, Api Design, Pagination, Serverless Computing, Microservices - **Published:** September 10, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=23a9f0a2303e4fa8 ## About the Role 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, Experience in government or regulated environments (FIPS, CJIS, HIPAA) - a plus, not a requirement * 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 ## Description We are seeking a highly skilled and experienced Senior Software Engineer (Backend / API) to join a contractor program supporting a critical customer engagement: a state government professional licensing and regulatory compliance platform built on Google Cloud. This is greenfield work - infrastructure, data and CI/CD are in place, and the application services are still to be built. This role is ideal for a senior backend engineer with deep Java and Spring Boot experience who owns core domain services end to end and designs the APIs the rest of the platform is built on. The successful candidate will build the licensing, case management, payments, document and notification services and the public and internal API surface, working closely with the client technical lead, the integration engineers, and the mobile and frontend engineers to ensure project success from initial definition through final delivery., 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, Design and implement Java 21 / Spring Boot microservices on Cloud Run for the core domain: licensing, applications and renewals, case management, payments, documents, and notifications * Own the platform API surface - specify it in OpenAPI, keep contracts stable for the 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 the domain events other services and the integration layer subscribe to * Implement scheduled and timer-driven processing with Cloud Tasks and Cloud Scheduler (renewal reminders, expiration sweeps, 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 ## Related Videos - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [How Unit Testing Saved My Career](https://www.wearedevelopers.com/videos/1642-how-unit-testing-saved-my-career) - [Delegating the chores of authenticating users to Keycloak](https://www.wearedevelopers.com/videos/1558-delegating-the-chores-of-authenticating-users-to-keycloak) - [Inside Bitpanda's Tech Stack: Scaling a European Fintech Leader - Markus Dorner](https://www.wearedevelopers.com/videos/1979-inside-bitpanda-s-tech-stack-scaling-a-european-fintech-leader-markus-dorner) - [Delay the AI Overlords: How OAuth and OpenFGA Can Keep Your AI Agents from Going Rogue](https://www.wearedevelopers.com/videos/1637-delay-the-ai-overlords-how-oauth-and-openfga-can-keep-your-ai-agents-from-going-rogue) - [An Opinionated Guide to Bulletproof APIs](https://www.wearedevelopers.com/videos/100182-an-opinionated-guide-to-bulletproof-apis) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [20 Essential Tools For Backend Development](https://www.wearedevelopers.com/magazine/218-20-essential-tools-for-backend-development) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [The Best X (Twitter) Accounts for Developers](https://www.wearedevelopers.com/magazine/294-the-best-x-twitter-accounts-for-developers)