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Open Systems Technologies
Back End Developer

Back End Developer

Hybrid

Mississauga, Canada

Freelance

22-12-2025

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Skills

Communication Python Java MongoDB CI/CD DevOps Docker Kubernetes Agile methodologies Architecture Programming Azure AWS Django Software Development cloud platforms Agile SDLC Spring GCP Spring Boot CI/CD Pipelines Kafka Microservices

Job Specifications

Job Title: Senior Java Developer

Location: Mississauga – Hybrid – 3 days/week

Term: 6 months contract plus extension

The Senior Java Developer is a senior level position responsible for establishing and implementing new or revised application systems and programs in coordination with the Technology team. The overall objective of this role is to lead applications systems analysis and programming activities.

Qualifications:

• 8-12 years of hands-on experience in Java backend development and Python, Django and/or Python related frameworks and libraries.

• Proficiency with Framework such as Spring Boot.

• Able to implement high throughput, low-latency, extremely reliable frameworks.

• Deep understanding of Java technology such as garbage collection internal, dependency injection, annotation, threading model, and synchronization primitives.

• Strong understanding of microservices architecture and RESTful APIs.

• Experience with database technologies such as MongoDB.

• Familiarity with cloud platforms like AWS, GCP, Azure and containerization (Docker, Kubernetes).

• Solid understanding of software development lifecycle (SDLC) and Agile methodologies.

• Excellent communication skills and the ability to collaborate effectively in a team environment.

• Experience with message brokers such as Kafka.

• Knowledge of DevOps practices and CI/CD pipelines.

About the Company

Open Systems Technologies is a tier-one vendor for the world's most competitive financial and technology companies, offering both full-time and contract recruiting services across the country. We offer a positive, entrepreneurial, high performing culture where all employees have the unique opportunity to run a full desk. Our office looks, feels, and operates like a start-up, but with the stability, clientele, and resources that only an industry veteran can provide. At our core, we are structured to be flexible. With over 3... Know more