Software Engineer (Contract)

540 is seeking a Software Engineer to support the DoW in building a next-generation Air Force aircraft maintenance platform. This application leverages Java/Spring Boot microservices, Angular front-end applications, and cloud-native infrastructure (Kubernetes, Google Cloud, Apigee). Engineers on this team build and scale full-stack features across user interfaces, backend services, and data layers that power critical maintenance operations. This platform will modernize how Air Force maintainers plan and execute maintenance and is a key part of the Air Force's technology strategy for the coming decade.This role is offered as a contract engagement and is ideal for engineers who value flexibility, autonomy, and high-impact work. While there may be an opportunity to convert to full-time in the future, conversion is not guaranteed and is dependent on program needs.Location: Remote within the continental United States, East Coast working hoursCitizenship & Clearance Requirement: per client requirements, candidates must be a U.S. Citizen with the ability to obtain a DoW Secret clearanceEducation Requirement: Bachelor's Degree in Computer Science or related engineering field (preferred)Contract Duration: initial 12 month contract, 40 hours per weekWHY 540?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 IMPACTDevelop full-stack features across Angular front-end applications and Java/Spring Boot microservicesDevelop offline-first capabilities that enable reliable client-side data persistence and seamless synchronization with backend systemsBuild and deploy services in containerized environments (Docker, Kubernetes)Design and integrate RESTful APIs to enable secure communication across systemsImplement asynchronous messaging patterns (Kafka) for distributed systemsDesign 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 solutionsContribute to technical design documentation, including system diagrams and architecture artifactsParticipate in code reviews, testing, and troubleshooting to ensure high-quality softwareSupport and improve CI/CD pipelines and deployment processesEnhance system performance, scalability, and reliability as the platform evolvesREQUIRED SKILLS & EXPERIENCE5+ years of professional software development experienceStrong experience with Java and Spring Boot for building production-grade servicesExperience 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 MavenExperience designing resilient data synchronization patterns and RESTful interfacesExperience 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 quicklyExcellent communication and collaboration skillsDemonstrated ownership and ability to drive work from concept through deliveryNICE TO HAVEExperience building offline-capable web applications (PWAs)Hands-on experience with browser-based databases such as IndexedDBFamiliarity with Web Crypto API for client-side encryption-at-restExperience implementing conflict resolution patterns (e.g., syncing and merging client/server data)Experience with Google Cloud Platform (GCP) or similar cloud environmentsExperience with API gateways and API management platforms, such as Google ApigeeFamiliarity with API authentication and authorization (PKI, OAuth2, JWT, LDAP, SAML, etc.)Experience working with OpenAPI/Swagger specificationsExperience supporting U.S. Federal Government programs, particularly DoW environmentsGCP Certifications (Professional Cloud Architect or Professional Cloud Developer)EQUAL EMPLOYMENT OPPORTUNITY (EEO)540's policy is to provide equal employment opportunity to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training.