Senior Java Developer

Open Systems Tech is looking for a Senior Java Developer for one of our financial services clients based out of Mississauga / ON. This is a time sensitive opportunity, please apply ASAP.Job Title : Senior Java DeveloperLocation : Mississauga – Hybrid – 3 days / weekTerm : Long term contract plus extensionBackend Development (Required) : - Strong Core Java and functional programming experience. - Understanding of concurrent and parallel programming, including threads, processes, synchronization, and handling race conditions. - Must have deep understanding of information reporting and payments integration with ERP systems like QuickBooks, NetSuite, Xero etc. - Should be able to build, debug and execute code in Oracle NetSuite native scripts. - Able to build APIs using reactive programming, backpressure and handling complex concurrency scenarios. - Apply machine learning libraries to Java applications, implementing model training and prediction pipelines. - Strong knowledge of security protocols, asymmetric encryption, cryptographic hashing, PKI, IAM, Zero Trust Architectures (ZTA). - Promote Enterprise Integration Patterns (EIPs) using tools like Apache Camel, Kafka, Rabbit MQ and Spring Integration. - Use profiling tools to measure application performance and identify latency, memory leaks and CPU usage issues. - Knowledge of JVM internals like garbage collection algorithms (G1, CMS, ZGC), memory heap management and JVM tuning. - Mastery and deep knowledge of the Elastic Search and Kibana products are a must. - Strong experience in data modeling and experience with relational and no-SQL database, Oracle and MongoDB. - Understanding of integrating APIs with third party libraries / vendors and handle the security around it. - Distributed Computing Concepts : Understanding the principles of distributed systems, including data partitioning, replication, and consistency models. - Understanding of microservices architecture, including service discovery, API gateways, and inter-service communication. - Knowledge of security practices in distributed systems, including encryption, authentication, authorization, and secure communication. Other areas (Required) : - Exceptional Problem-Solving and Analytical Skills to diagnose and resolve issues in distributed environments. - Above average skills in monitoring, logging, and debugging distributed systems to ensure reliability and performance. - Expertise in fundamental concepts such as consistency, availability, partition tolerance, fault tolerance, and scalability. - Familiarity with container orchestration (e.g., Kubernetes), and distributed messaging systems (e.g., Kafka). - Experience using Git / BitBucket. - Good communication skills, both written and verbal. Other areas (Good to have) : - Unix shell scripting. - Knowledge of GraphQL. - Experience with building apps which are highly performant and scalable will be great. - Knowledge of Generating Artificial Intelligence (AI), Machine Learning (ML), and Large Language Models (LLMs).