Senior Backend Engineer

Job Overview

As a Senior Backend Engineer at Streamlyn, you will be responsible for designing, building, and scaling backend services and APIs that support our ad-serving infrastructure, analytics pipelines, and internal tools. You will work closely with cross-functional teams, mentor junior developers, and contribute to high-performance, scalable architecture in a fast-paced AdTech environment.

Roles and Responsibilities

• Design and develop robust backend services and APIs using Spring Boot and Java.
• Build and maintain microservices that support scalable ad-serving and reporting infrastructure.
• Write unit, integration, and performance tests to ensure software quality and reliability.
• Work with databases such as MariaDB, Redis, and Kafka for real-time data processing and persistence.
• Collaborate with frontend, DevOps, and product teams to build end-to-end features.
• Mentor junior developers and contribute to system architecture discussions.

Primary (Core Requirements)

• Programming Language: Java 17+
• Framework: Spring Boot 3.x (Web, Security, Data JPA, Validation)
• Build Tool: Maven or Gradle
• ORM/DB: Hibernate / JOOQ + MariaDB / PostgreSQL
• Caching: Redis (Jedis), Caffeine (optional)
• Version Control: Git, GitLab Flow

Focus (Good to Know / Day-to-Day Use)

• Event Streaming: Kafka (producer/consumer)
• Documentation: Swagger/OpenAPI
• Testing: JUnit 5, Mockito, Testcontainers
• CI/CD: GitLab CI, Docker
• Monitoring: Prometheus + Grafana
• Security: JWT, role-based access, OWASP best practices

Additional Exposure (Nice to Have / Growth Areas)

• ETL and reporting pipelines
• Multi-tenant support systems
• Performance tuning and caching strategies
• Familiarity with Kubernetes and service mesh concepts
• Hands-on with AWS services or equivalent cloud platforms

Qualifications

• 4+ years of experience in backend development.
• Strong knowledge of Spring Boot, REST API design, and distributed systems.
• Proficiency in database schema design, optimization, and indexing strategies.
• Experience with asynchronous processing and messaging queues.
• Good communication, documentation, and collaboration skills.