Full Stack Engineer

Apptoza Inc.; Toronto; On-site; CAD 120,000 - 180,000; Full time

Job summary

Apptoza Inc. is seeking a senior backend engineer to design, build, and deliver advanced Gen AI-enabled systems in Toronto. You will lead end-to-end delivery, define architecture, and collaborate with data scientists, product owners, and frontend teams.

You will mentor developers, drive best practices, and implement scalable solutions using Java or Python, React frontends, and cloud platforms like OpenShift and Kubernetes.

Qualifications

• 7+ years backend development experience in Java or Python.
• REST API and microservices experience.
• Frontend development with React and micro-frontend architectures.
• Hands-on experience or strong understanding of Agentic AI concepts, LLM integrations.
• Understanding of prompt engineering and Gen-AI development tools (GitHub Copilot, Windsurf, Claude Code).
• Experience with Cloud platforms and technologies (OpenShift, Kubernetes, S3 Object Storage).
• Experience with PostgreSQL, including schema design and query optimization.

Responsibilities

• Lead end-to-end technical delivery of projects and architecture decisions.
• Collaborate with stakeholders to translate objectives into technical solutions.
• Provide technical direction and mentorship to junior developers.
• Implement Gen AI systems into production and ensure alignment with business objectives.

Skills

Backend (Java/Python)

REST API

Microservices

React & MFE

Agentic AI

LLM integration

Prompt engineering

GenAI tools

Cloud platforms

PostgreSQL

Tools

GitHub Copilot

Windsurf

Claude Code

OpenShift

Kubernetes

S3 Object Storage

Job description

• Designs, develops, and oversees the implementation of advanced technical solutions, ensuring alignment with business objectives and adherence to best practices, while managing the end-to-end technical delivery of projects.
• Build Gen AI system frameworks, Prompt Engineering, including designing and refining prompts to optimize LLM outputs, implementing Gen AI systems into production.
• Leads development teams in the delivery of capabilities, providing technical direction and guidance to junior developers and team members and ensuring the successful execution of complex assignments and projects
• Collaborates with business stakeholders and product owners to translate strategic objectives into actionable technical solutions, leveraging advanced knowledge to address unique and high impact challenges.
• You will be responsible for working closely with AI data scientists to support data ingestion and feature engineering, establishing industry best practices, maintaining and managing technical documentations.
• Executes on software development tasks or projects, requiring advanced problem solving, decision making and strategic thinking with some ambiguity.
• Drives decisions on complex issues to develop clear, actionable recommendations for management, ensuring alignment on processes, tools and services with impact across other areas.
• Leverages advanced and creative skills to resolve complex software development related problems, fostering cross functional collaboration to identify and implement innovative solutions.
• Leads and facilitates cross functional collaboration efforts, fostering strong internal relationships across the organization and external partnerships to achieve impactful business outcomes.

What Do You Need to Succeed?

Must Have:

• 7+ years of backend development experience in Java or Python
• Strong backend development experience in Java or Python, including REST API and microservices
• Strong experience with React and modern frontend development, including Micro-frontend (MFE) architectures and reusable UI components
• Hands-on experience or strong understanding of Agentic AI concepts, LLM integrations
• Understanding of prompt engineering and Gen-AI Development tools (GitHub Copilot, Windsurf, Claude Code)
• Experience with Cloud platforms and technologies (OpenShift, Kubernetes, S3 Object Storage)
• Experience working with relational databases particularly PostgreSQL, including schema design, query optimization and performance tuning.

Nice-to Have:

• Experience with Spec-driven Development
• Experience in Camunda 8 development and customization
• Experience with Vector Databases
• Understanding of RAG architectures
• Strategic thinker with excellent interpersonal skills to work across functions and businesses