Fullstack Developer

Adastra; Markham; Hybrid; CAD 83,000 - 152,000; Part time

Benefits offered by this job

Career progression

Competitive compensation

Successful referral program

Canada’s 50 Best Managed Companies

Flexible, dynamic, diverse workplace

Job summary

Adastra seeks a Full Stack Developer to build scalable, production-ready applications combining backend engineering with AI and Generative AI capabilities. The role focuses on Python/Java backend and reusable SDKs, with front-end work in React/TypeScript and cloud deployment via Docker/Kubernetes.

Primary location is Toronto or Brampton with a hybrid 4-days onsite model. This contractor role involves delivering secure, reliable enterprise solutions and collaborating across engineering, product,

Qualifications

• Strong hands-on backend development experience using Python and Java.
• Experience designing and developing scalable APIs, backend services, and reusable SDKs.
• Hands-on experience with FastAPI, Spring Boot, and microservices architecture.
• Strong experience developing AI and Generative AI applications.
• Experience working with large language models, retrieval-augmented generation, and agentic AI.
• Hands-on experience with LangChain, LangGraph, and Model Context Protocol.

Responsibilities

• Design, develop, and maintain scalable backend services, APIs, and reusable SDKs using Python and Java.
• Build backend solutions using FastAPI, Spring Boot, and microservices architecture.
• Develop AI-powered applications using large language models, retrieval-augmented generation, agentic AI, LangChain, LangGraph, and Model Context Protocol.
• Integrate commercial and open-source AI models into enterprise applications.
• Build responsive web applications using React, TypeScript, and modern frontend frameworks.
• Integrate frontend applications with backend APIs and AI-powered services.
• Develop and integrate AI platform capabilities, including model gateways, prompt management, vector databases, evaluation frameworks, and guardrails.
• Deploy and support applications using cloud platforms, Docker, Kubernetes, and CI/CD pipelines.
• Implement automated testing, observability, performance optimization, and secure API design.
• Support enterprise authentication and authorization requirements.
• Collaborate with engineering, product, and cross-functional teams to deliver scalable and maintainable solutions.

Skills

Python

Java

API design

FastAPI

Spring Boot

Microservices

React

TypeScript

AI / Generative AI

LangChain

LangGraph

Model Context Protocol

Docker

Kubernetes

Tools

Docker

Kubernetes

React

TypeScript

FastAPI

Spring Boot

LangChain

LangGraph

Job description

Overview

We are looking for a Full Stack Developer to build scalable, production-ready applications that combine modern backend engineering with advanced AI and Generative AI capabilities. The role will focus primarily on developing backend services and reusable SDKs using Python and Java, as well as integrating technologies such as large language models, retrieval-augmented generation, agentic AI, and model context protocols. You will also contribute to frontend development, cloud-based AI platforms, and the delivery of secure, reliable, and maintainable enterprise solutions

Primary Location: Toronto, ON or Brampton, ON

Work Model: Hybrid 4-Days Onsite

Employment Type: Contractor

RESPONSIBILITIES:

• Design, develop, and maintain scalable backend services, APIs, and reusable SDKs using Python and Java
• Build backend solutions using FastAPI, Spring Boot, and microservices architecture
• Develop AI-powered applications using large language models, retrieval-augmented generation, agentic AI, LangChain, LangGraph, and Model Context Protocol
• Integrate commercial and open-source AI models into enterprise applications
• Build responsive web applications using React, TypeScript, and modern frontend frameworks
• Integrate frontend applications with backend APIs and AI-powered services
• Develop and integrate AI platform capabilities, including model gateways, prompt management, vector databases, evaluation frameworks, and guardrails
• Deploy and support applications using cloud platforms, Docker, Kubernetes, and CI/CD pipelines
• Implement automated testing, observability, performance optimization, and secure API design
• Support enterprise authentication and authorization requirements
• Collaborate with engineering, product, and cross-functional teams to deliver scalable and maintainable solutions

QUALIFICATIONS, SKILLS & EXPERIENCE:

• Strong hands-on backend development experience using both Python and Java
• Experience designing and developing scalable APIs, backend services, and reusable SDKs
• Hands-on experience with FastAPI, Spring Boot, and microservices architecture
• Strong experience developing AI and Generative AI applications
• Experience working with large language models, retrieval-augmented generation, and agentic AI
• Hands-on experience with technologies such as LangChain, LangGraph, and Model Context Protocol
• Experience integrating commercial or open-source AI models into applications
• Experience developing frontend applications using React and TypeScript
• Understanding of software engineering principles, API design, automated testing, and application security
• Experience delivering reliable, scalable, and production-ready software solutions
• Strong collaboration and problem-solving skills

NICE TO HAVE:

• Experience with AI platform capabilities such as model gateways, prompt management, vector databases, evaluation frameworks, and guardrails
• Experience with Google Cloud Platform or another major cloud platform
• Experience with Docker and Kubernetes
• Experience building and maintaining CI/CD pipelines
• Experience with observability, application monitoring, and performance optimization
• Knowledge of enterprise authentication and authorization patterns
• Experience supporting the full lifecycle of AI-powered applications

ABOUT ADASTRA

Adastra is a global leader in AI and data-driven transformation, helping organizations lead with artificial intelligence—responsibly, strategically, and at scale. With over 25 years of experience, Adastra empowers enterprise clients to unlock business value through data innovation, operational excellence, and smart customer engagement.

Trusted by some of the world’s most prominent brands, Adastra delivers end-to-end solutions grounded in thoughtful strategy, robust governance, and deep technical expertise. From defining vision to ensuring execution, Adastra guides organizations through every stage of their AI, data and cloud journey—building future-ready capabilities and delivering measurable, lasting impact.

Adastra serves clients across key industries including financial services, automotive, manufacturing, technology, media and telecom (TMT), healthcare, retail, and professional services. The company employs more than 2,000 professionals across North America, Europe, and Asia.

WHAT WE OFFER

• Opportunity for advancement and career progression
• Competitive compensation
• Successful referral program
• The opportunity to work with one of Canada’s 50 Best Managed Companies
• Satisfaction of working for a reputable company
• A flexible, dynamic, and diverse workplace

EQUAL OPPORTUNITY EMPLOYER

In our commitment to promote fair and equitable treatment of all employees and applicants, Adastra Corporation provides equal employment opportunities for all individuals regardless of age, sex, disability, race, ethnic origin, citizenship, creed, sexual orientation, marital status, or any other ground as described in the Ontario Human Rights Code.In addition, accommodation will be provided during the hiring process. Adastra Corporation’s implementation and support of employment initiatives, encourage diversified labour force participation and equal access to opportunities based on merit and performance.