Sr Principal Software Engineer (HANDS-ON, currently practicing)

GlobeTech Group; Toronto; On-site; CAD 200,000 - 250,000; Full time

Job summary

A leading tech firm in Ontario is seeking a Principal Back-End Java Developer to drive the design and delivery of scalable backend systems. You will work hands-on with Java, integrate AI components, and collaborate with cross-functional teams. Ideal candidates have 12+ years of experience in Java backend development, strong skills in microservices, and AI frameworks. This is a 12-month contract position offering CAD$105 per hour.

Qualifications

• 12+ years of experience in Java backend development.
• Hands-on exposure to AI frameworks or platforms.
• Strong understanding of databases (SQL & NoSQL).

Responsibilities

• Architect and develop scalable, reliable, and secure back-end systems using Java.
• Integrate AI and ML modules into core backend platforms.
• Mentor junior and mid-level developers.

Skills

Java backend development

Microservices

Kubernetes

AI integration

CI/CD pipelines

Docker

Agile methodologies

Tools

Spring Boot

REST APIs

OpenAI APIs

Hugging Face Transformers

TensorFlow

PyTorch

Job description

Job Description

Job Description

12+ years of experience for Java back end

Overview :

We are seeking a HANDS-ON Principal Back-End Java Developer with a strong foundation in enterprise-grade backend architecture , Java ecosystems , and modern AI integrations . This role will drive the design and delivery of scalable back-end systems, while exploring and embedding AI-powered components (e.g., recommendation systems, NLP pipelines, intelligent automation) into product workflows.

Pleasedo NOT apply if you're not practicing, we do not want people management, or leading team. We are looking for hard core software developer.

You will play a technical leadership role , mentoring engineers, collaborating cross-functionally, and aligning systems with long-term business goals.

Key Responsibilities :

• Architect and develop scalable, reliable, and secure back-end systems using Java (Java 17+, Spring Boot, etc.) .
• Lead design and integration of AI / ML modules into core backend platforms (using APIs, microservices, or embedded inference engines).
• Collaborate with Data Science and ML teams to operationalise AI models (MLOps).
• Champion best practices in software engineering , DevOps , and code quality across the team.
• Evaluate emerging technologies and assess AI tooling / libraries (e.g., Hugging Face, LangChain, TensorFlow, OpenAI).
• Drive performance optimisation of existing services and refactor legacy code as needed.
• Influence product and system design through deep understanding of scalability and AI augmentation .
• Mentor junior and mid-level developers; lead technical design reviews and code walkthroughs.

Key Requirements :

10+ years of professional experience in Java backend development.

Microservices and Kubernetes

Expert-level skills in Java, Spring Boot, REST APIs , microservices architecture , and asynchronous systems .

Experience integrating AI / ML features into production systems (e.g., chatbots, NLP, anomaly detection, recommender systems ).

Hands-on exposure to AI frameworks or platforms : OpenAI APIs, Hugging Face Transformers, LangChain, PyTorch / TensorFlow, etc.

Proficient with CI / CD pipelines, Docker, Kubernetes , and cloud platforms ( AWS / GCP / Azure ).

Strong understanding of databases (SQL & NoSQL), distributed systems, and caching mechanisms.

Proven experience in leading teams , conducting design reviews, and owning production-critical systems.

Excellent communication skills and ability to work cross-functionally in an Agile environment.

This is 12 months contract position , CAD$105 per hour, 8 hours / 20 days per month