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Job Title: Senior Full Stack Engineer (Java / Angular).

Location: Washington, DC (Onsite).

Employment Type: W2 Contract.

Duration: 11 months.

About the Opportunity:

ZipStaff is hiring a Senior Full Stack Engineer (Java / Angular) for our client, a major U.S. passenger rail transportation organization based in Washington, DC. Supporting mission-critical operations applications, your work will be about 75-80% backend distributed architecture (Java 17/21, Spring Boot, Kafka, PostgreSQL) and 20-25% Angular front-end, delivering fault-tolerant microservices, event-driven systems and AWS CI/CD.

What You'll Do:

Build and maintain Spring Boot microservices (Java 17/21) with REST and reactive endpoints.
Architect Spring Kafka pipelines handling ordering, retries, DLTs, idempotency and schema evolution.
Model and optimize data with Spring Data JPA, Hibernate and PostgreSQL; build Spring Batch jobs.
Implement Resilience4j patterns and Spring Security, OAuth2, JWT and AWS Secrets Manager.
Build accessible UI features in Angular (v15+), TypeScript and RxJS.
Write JUnit 5 and Spring Boot Test suites; contribute to Playwright E2E tests.
Containerize with Docker and run CI/CD with GitHub Actions and AWS CodeBuild.
Lead code reviews, mentor developers and support production incidents.

Required Qualifications:

5+ years of production backend engineering with secondary modern front-end focus.
Deep Java 17/21, Spring Boot, Spring Security, Spring Data and PostgreSQL.
Event-driven systems with Apache Kafka or AWS MSK (DLTs, idempotency, consumer rebalancing).
Angular (v15+), TypeScript, RxJS and Tailwind, PrimeNG or Angular Material.
Resilience4j and automated testing with JUnit 5 and Spring Boot Test.
Docker on AWS with GitHub Actions or CodeBuild.
Bachelor's in CS or related field, or equivalent experience.

Nice to Have:

NgRx state management.
Spring WebFlux, Avro/JSON Schema, Confluent Schema Registry.
Playwright E2E automation.
Transportation, rail, fleet or logistics domain experience.

Benefits:

Health Insurance.
Dental Insurance.
Vision Insurance.
401(k) + 401(k) matching.
Paid time off.
Referral Program.

About ZipStaff:

ZipStaff connects skilled technology professionals with leading organizations across the United States, matching top talent with impactful contract and full-time opportunities.

To apply, submit your resume through this posting. Qualified candidates will be contacted by a ZipStaff recruiter.

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Apply for Senior Full Stack Engineer (Java/Angular) at ZipStaff Inc.