Senior Software Engineer Backend - AIGEN Platform - Contractor
About us Appnovation is a global, full-service digital partner that combines Strategy, Experience & Design, Engineering and Managed Services. We build digital solutions that deliver real impact today and serve as foundations for future growth. Bold ambition. Practical action. Endless possibilities. About the Role As a Senior Software Engineer - Backend, you will build low-latency transaction and orchestration services that power real-time loyalty point calculations, instant discount applications, and seamless integration between loyalty and marketing systems. You will be responsible for developing microservices that handle millions of transactions daily while maintaining sub-200ms response times and ensuring data consistency across distributed systems. This role requires exceptional Java expertise and a deep understanding of high-performance, event-driven architectures Key Responsibilities: Building high-performance transaction processing services for loyalty point earn/redeem operations Developing event-driven microservices that publish clean business events to downstream systems Implementing orchestration services between AIGENS loyalty engine and marketing automation platforms Creating resilient APIs with proper idempotency, retry mechanisms, and circuit breakers Optimizing service performance to achieve sub-200ms response times under high load Implementing distributed caching strategies using Redis/ElastiCache Building light admin endpoints and operational dashboards for internal monitoring Writing comprehensive unit and integration tests with >80% coverage Implementing observability solutions including distributed tracing and metrics Participating in code reviews and mentoring junior developers Creating technical documentation for APIs and services What we are looking for Must-Have: At least 5-7 years of backend development experience with Java in production environments Proven track record building microservices handling high transaction volumes (>1000 TPS) Strong expertise in Spring Boot and Spring Cloud ecosystems Experience with event streaming platforms (Kafka, Kinesis) in production Deep understanding of distributed systems patterns including eventual consistency and saga patterns Hands-on experience with caching strategies and performance optimization Experience building RESTful APIs with proper versioning and documentation Strong background in automated testing and TDD/BDD practices Experience with financial services or payment processing systems preferred Technologies Languages/Frameworks: Java 17/21, Spring Boot 6, Spring Cloud, Spring WebFlux (reactive) Messaging/Streaming: Apache Kafka, AWS SQS/SNS, Event sourcing patterns APIs: REST, OpenAPI/Swagger, API versioning strategies Databases: MySQL/PostgreSQL, Redis, connection pooling, query optimization Caching: Redis, Spring Cache, AWS ElastiCache, cache invalidation strategies Testing: JUnit 5, Mockito, TestContainers, REST Assured Observability: Spring Actuator, Micrometer, CloudWatch, distributed tracing Build/Deploy: Maven/Gradle, Docker, Kubernetes basics Nice-to-Have: Experience with reactive programming (Project Reactor) Knowledge of PCI-DSS compliance requirements Experience with loyalty or rewards platforms Familiarity with Domain-Driven Design (DDD) principles Experience with CQRS and Event Sourcing patterns AWS Developer Associate certification Experience building operational dashboards (Spring Boot Admin, Grafana). Who you are You are a detail-oriented engineer who writes clean, maintainable code and takes pride in building robust, scalable systems. You understand the importance of performance optimization and can balance technical excellence with delivery timelines. What Appnovation Offers Challenging and rewarding work with real impact Direct Access to Cutting-Edge AI Platforms Diverse and Inclusive Culture Growth opportunities for personal and professional development A collaborative and innovative work environment where your ideas are valued Exposure to exciting projects and high-profile clients Supportive work environment with access to company leaders Thank you for your interest in a career with Appnovation Technologies! Please note that only those selected for an interview will be contacted. At Appnovation, we recognize that diverse teams are the strongest teams. Diversity, Equity & Inclusion is not only something that we embrace - we celebrate it! We are proud to be an Equal Opportunity Employer and we encourage applicants from all backgrounds, lived experiences and industries to apply. Come join us at Appnovation, and learn more about how we stay true to our company values as we build better lives through better digital. Accommodations are available upon request throughout the recruitment process.