540 - Software Engineer (Contract)
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Requirements
• 5+ years of professional software development experience • Strong experience with Java and Spring Boot for building production-grade services • Experience with JavaScript/TypeScript and modern frameworks (Angular preferred) • Experience developing microservices in containerized environments (Docker, Kubernetes) • Experience with asynchronous messaging systems (Kafka) • Proficiency with build tools such as Gradle or Maven • Experience designing resilient data synchronization patterns and RESTful interfaces • Experience working with relational databases (Postgres or MySQL) and client-side storage solutions (IndexedDB) • Ability to produce technical design documentation (diagrams, system designs) • Strong problem-solving skills and ability to learn new technologies quickly • Excellent communication and collaboration skills • Demonstrated ownership and ability to drive work from concept through delivery • Experience building offline-capable web applications (PWAs) • Hands-on experience with browser-based databases such as IndexedDB • Familiarity with Web Crypto API for client-side encryption-at-rest • Experience implementing conflict resolution patterns (e.g., syncing and merging client/server data) • Experience with Google Cloud Platform (GCP) or similar cloud environments • Experience with API gateways and API management platforms, such as Google Apigee • Familiarity with API authentication and authorization (PKI, OAuth2, JWT, LDAP, SAML, etc.) • Experience working with OpenAPI/Swagger specifications • Experience supporting U.S. Federal Government programs, particularly DoW environments • GCP Certifications (Professional Cloud Architect or Professional Cloud Developer) • EQUAL EMPLOYMENT OPPORTUNITY (EEO)
Benefits
• 540 is a forward-thinking company that the government turns to in order to #getshitdone. We don’t just talk about innovation – we deliver it. We break down barriers, build impactful technology, and solve mission-critical problems. • HOW YOU’LL DRIVE IMPACT • Develop full-stack features across Angular front-end applications and Java/Spring Boot microservices • Develop offline-first capabilities that enable reliable client-side data persistence and seamless synchronization with backend systems • Build and deploy services in containerized environments (Docker, Kubernetes) • Design and integrate RESTful APIs to enable secure communication across systems • Implement asynchronous messaging patterns (Kafka) for distributed systems • Design and maintain data models and persistence layers (Postgres or MySQL), along with client-side storage solutions (IndexedDB) • Collaborate with engineers, architects, and stakeholders to translate mission needs into scalable technical solutions • Contribute to technical design documentation, including system diagrams and architecture artifacts • Participate in code reviews, testing, and troubleshooting to ensure high-quality software • Support and improve CI/CD pipelines and deployment processes • Enhance system performance, scalability, and reliability as the platform evolves
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