Senior Java Full-Stack Engineer (Microservices)

Techstra Solutions•Pittsburgh, PA

About The Position

We are seeking a Senior Java Full-Stack Engineer to lead the design and development of scalable, high-concurrency microservices . This is a hands-on, full-stack role leveraging Java 17+ and Spring Boot on the backend and Angular on the frontend. The ideal candidate has strong experience working in distributed systems and managing complex data environments using Oracle and MongoDB , with a focus on performance, data integrity, and resiliency.

Requirements

7+ years of professional software development experience
Strong hands-on experience with Java 17+ and Spring Boot 3.x
Proven experience building microservices-based systems
Full-stack experience with Angular (v14+)
Java, Spring Boot, and Spring Cloud
Oracle (advanced SQL / PL-SQL, performance tuning)
MongoDB (NoSQL modeling, aggregations, versioning)
RESTful API design and integration
TDD / BDD and automated testing
CI/CD pipelines and modern DevOps practices
Strong analytical and problem-solving skills
Ability to mentor junior and mid-level engineers
Comfortable working in fast-paced, distributed team environments
Clear communicator with strong ownership mindset

Nice To Haves

Event streaming with Apache Kafka (Producers, Consumers, Kafka Streams)
Experience with IBM MQ or RabbitMQ
Exposure to cloud-native or containerized deployments
Experience in financial services, banking, or other regulated industries

Responsibilities

Lead the architectural design of microservices-based solutions , ensuring loose coupling, scalability, and high availability
Apply distributed systems patterns such as service discovery, API gateways, and circuit breakers (Resilience4j)
Contribute to solution design decisions related to scalability, fault tolerance, and data consistency
Build end-to-end features from Angular UI through backend services to Oracle and MongoDB persistence layers
Design and implement secure, well-structured RESTful APIs
Collaborate with product owners, architects, and peers to deliver high-quality features
Develop and maintain backend services using Java 17+ and Spring Boot 3.x
Leverage modern Java features including: Records Sealed Classes Pattern Matching Stream API
Use Spring ecosystem components: Spring Web Spring Data JPA / MongoDB Spring Security Spring Cloud
Design and optimize data access for Oracle and MongoDB
Perform performance tuning, indexing, and query optimization (SQL and MQL)
Apply polyglot persistence and data consistency patterns such as: Saga Transactional Outbox
Ensure transactional integrity across distributed services
Strong focus on TDD / BDD practices
Build and maintain automated tests using: JUnit 5 Mockito Testcontainers (Oracle and MongoDB integration testing)
Participate in code reviews and uphold engineering best practices
Build and support CI/CD pipelines using: Jenkins GitLab CI GitHub Actions
Support deployment and release activities in cloud or containerized environments
Implement and enforce security standards including: OAuth2 OIDC JWT
Ensure secure communication and standardized error handling across services