Senior Full Stack Application Developer Salary:
$110,000 – $130,000 + Benefits + Vacation (exact placement within this range will depend on skills and qualifications)
Location:
Thornhill, Ontario (hybrid)
Length:
Full-time, permanent
About Us At WellnessLiving, we empower thousands of health and wellness business owners to turn their entrepreneurial dreams into reality. Our mission‑critical software fuels their vision, supporting millions of clients around the world in their wellness journeys. With a deep commitment to putting our customers first, we foster a culture that values high performance, adaptability, and accountability. If you are a skilled professional who thrives in a fast‑paced, customer‑focused environment and are passionate about making a meaningful impact on the health and wellness industry, we would love to connect with you.
Our team is driven by four core values that shape everything we do.
Customer First We approach every challenge with a customer‑focused lens, driven by an obsession with our customers’ happiness and success.
Excellence We approach every task, whether big or small, with a steadfast commitment to exceptional execution and the pursuit of greatness.
Accountability We take full ownership of our decisions, actions, and outcomes – both successes and failures.
Adaptability We recognize that sustained success demands that we be malleable and purposefully evolve, acknowledging that the world is dynamic and constantly changing.
About the Role We are seeking a Senior Full‑Stack Application Developer to play a key, hands‑on role in our microservices and domain‑driven modernization journey. This role is ideal for an experienced engineer who combines strong frontend craftsmanship with backend and distributed systems thinking and has implemented modern cloud‑native architectures.
You will design, build, and evolve scalable, event‑driven, multi‑tenant SaaS applications used across multiple brands in the healthcare and fitness technology space. You will work end‑to‑end, from React‑based user experiences to secure APIs and microservices built with Node.js and Java (Spring Boot) while collaborating closely with product, architecture, DevOps, and data teams.
This role requires direct implementation experience, an ownership mindset, and the ability to work effectively in an environment where systems are actively transitioning from monolithic patterns to domain‑aligned microservices.
Key Responsibilities Full‑Stack Application Development
Design, develop, and maintain production‑grade full‑stack applications using React, Node.js, and Java/Spring Boot
Build modular, reusable frontend components aligned with design systems, accessibility standards, and responsive UX best practices
Develop secure, scalable RESTful and event‑driven APIs, ensuring performance, reliability, and backward compatibility
Microservices, DDD & Event‑Driven Systems
Implement microservices aligned to business domains and bounded contexts
Contribute to domain‑driven design (DDD) discussions and translate domain models into working services
Design and implement event‑driven workflows using messaging or streaming platforms (e.g., Kafka, Kinesis, SNS/SQS)
Apply patterns such as idempotency, event versioning, and eventual consistency
Implement and integrate modern authentication and authorization solutions using OAuth2, OpenID Connect (OIDC), and JWT
Work hands‑on with identity platforms such as Auth0 and/or FusionAuth
Design role‑based and permission‑based access controls suitable for multi‑tenant SaaS environments
Build and deploy services using Docker, Kubernetes, and AWS
Own services throughout their lifecycle: CI/CD, deployment, monitoring, and production support
Use infrastructure‑as‑code and automated pipelines (e.g., GitHub Actions, Terraform/CloudFormation)
Implement logging, monitoring, and alerting using tools such as Datadog, ELK, or Splunk
Write clean, testable, and maintainable code with appropriate unit, integration, and contract testing
Participate in code reviews, architecture reviews, and technical decision‑making
Collaborate cross‑functionally with Product, UX, QA, and Platform teams in an Agile environment
Mentor junior engineers and help raise overall engineering standards
AI‑Augmented Development
Leverage AI‑assisted development tools (e.g., Copilot, ChatGPT, internal AI tools) to improve productivity, code quality, and learning
Apply engineering judgment to validate, refactor, and test AI‑assisted outputs
Use AI responsibly for tasks such as scaffolding, refactoring, test generation, and documentation, and not as a substitute for engineering fundamentals
Required Qualifications & Experience
Bachelor’s degree in computer science, Engineering, or equivalent practical experience
5+ years of hands‑on full‑stack development experience in production environments
Strong experience with React, including Hooks, Context, and component‑driven architecture
Proficiency in JavaScript/TypeScript, HTML5, CSS3/SASS, and modern frontend tooling
Hands‑on experience building API‑first microservices using Java (Spring Boot), Node.js, and/or Python (FastAPI), with a strong emphasis on contract‑first design (OpenAPI), backward compatibility, and service evolution
Practical experience with microservices architectures, including service decomposition and inter‑service communication
Strong understanding of REST, OAuth2, OIDC, JWT, and API gateway patterns
Experience with Docker and Kubernetes in real production systems
Experience with cloud platforms (AWS preferred) and CI/CD pipelines
Working knowledge of relational and NoSQL data stores (e.g., MySQL, Redis, MongoDB, DynamoDB)
Experience with monitoring, logging, and observability in distributed systems
Comfortable working in Agile teams (Scrum/Kanban)
Nice to Have
Experience with Event Streaming / Messaging platforms (Kafka, Kinesis, SNS/SQS)
Exposure to Micro Frontend architectures (Module Federation, single‑spa)
Experience with multi‑tenant and white‑label SaaS platforms
Familiarity with PHP‑based legacy systems and modernization efforts
Knowledge of accessibility (WCAG) and internationalization
Experience in healthcare, fitness, or regulated SaaS environments
Please note that only those selected for an interview will be contacted.
We appreciate you taking the time and look forward to reviewing your application!
WellnessLiving is proud to be an equal opportunity employer. We base employment decisions solely on qualifications, experience, and business needs. We do not tolerate discrimination or harassment of any kind. All qualified applicants will receive consideration without regard to race, color, religion, creed, gender, gender identity or expression, sexual orientation, national origin, disability, age, genetic information, veteran status, marital or family status, or any other status protected by applicable laws.
We utilize AI to generate summaries of interview notes as part of our candidate evaluation process. This helps ensure a fair and consistent review while maintaining a human‑centered hiring approach.
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or continue with email
$110,000 – $130,000 + Benefits + Vacation (exact placement within this range will depend on skills and qualifications)
Location:
Thornhill, Ontario (hybrid)
Length:
Full-time, permanent
About Us At WellnessLiving, we empower thousands of health and wellness business owners to turn their entrepreneurial dreams into reality. Our mission‑critical software fuels their vision, supporting millions of clients around the world in their wellness journeys. With a deep commitment to putting our customers first, we foster a culture that values high performance, adaptability, and accountability. If you are a skilled professional who thrives in a fast‑paced, customer‑focused environment and are passionate about making a meaningful impact on the health and wellness industry, we would love to connect with you.
Our team is driven by four core values that shape everything we do.
Customer First We approach every challenge with a customer‑focused lens, driven by an obsession with our customers’ happiness and success.
Excellence We approach every task, whether big or small, with a steadfast commitment to exceptional execution and the pursuit of greatness.
Accountability We take full ownership of our decisions, actions, and outcomes – both successes and failures.
Adaptability We recognize that sustained success demands that we be malleable and purposefully evolve, acknowledging that the world is dynamic and constantly changing.
About the Role We are seeking a Senior Full‑Stack Application Developer to play a key, hands‑on role in our microservices and domain‑driven modernization journey. This role is ideal for an experienced engineer who combines strong frontend craftsmanship with backend and distributed systems thinking and has implemented modern cloud‑native architectures.
You will design, build, and evolve scalable, event‑driven, multi‑tenant SaaS applications used across multiple brands in the healthcare and fitness technology space. You will work end‑to‑end, from React‑based user experiences to secure APIs and microservices built with Node.js and Java (Spring Boot) while collaborating closely with product, architecture, DevOps, and data teams.
This role requires direct implementation experience, an ownership mindset, and the ability to work effectively in an environment where systems are actively transitioning from monolithic patterns to domain‑aligned microservices.
Key Responsibilities Full‑Stack Application Development
Design, develop, and maintain production‑grade full‑stack applications using React, Node.js, and Java/Spring Boot
Build modular, reusable frontend components aligned with design systems, accessibility standards, and responsive UX best practices
Develop secure, scalable RESTful and event‑driven APIs, ensuring performance, reliability, and backward compatibility
Microservices, DDD & Event‑Driven Systems
Implement microservices aligned to business domains and bounded contexts
Contribute to domain‑driven design (DDD) discussions and translate domain models into working services
Design and implement event‑driven workflows using messaging or streaming platforms (e.g., Kafka, Kinesis, SNS/SQS)
Apply patterns such as idempotency, event versioning, and eventual consistency
Implement and integrate modern authentication and authorization solutions using OAuth2, OpenID Connect (OIDC), and JWT
Work hands‑on with identity platforms such as Auth0 and/or FusionAuth
Design role‑based and permission‑based access controls suitable for multi‑tenant SaaS environments
Build and deploy services using Docker, Kubernetes, and AWS
Own services throughout their lifecycle: CI/CD, deployment, monitoring, and production support
Use infrastructure‑as‑code and automated pipelines (e.g., GitHub Actions, Terraform/CloudFormation)
Implement logging, monitoring, and alerting using tools such as Datadog, ELK, or Splunk
Write clean, testable, and maintainable code with appropriate unit, integration, and contract testing
Participate in code reviews, architecture reviews, and technical decision‑making
Collaborate cross‑functionally with Product, UX, QA, and Platform teams in an Agile environment
Mentor junior engineers and help raise overall engineering standards
AI‑Augmented Development
Leverage AI‑assisted development tools (e.g., Copilot, ChatGPT, internal AI tools) to improve productivity, code quality, and learning
Apply engineering judgment to validate, refactor, and test AI‑assisted outputs
Use AI responsibly for tasks such as scaffolding, refactoring, test generation, and documentation, and not as a substitute for engineering fundamentals
Required Qualifications & Experience
Bachelor’s degree in computer science, Engineering, or equivalent practical experience
5+ years of hands‑on full‑stack development experience in production environments
Strong experience with React, including Hooks, Context, and component‑driven architecture
Proficiency in JavaScript/TypeScript, HTML5, CSS3/SASS, and modern frontend tooling
Hands‑on experience building API‑first microservices using Java (Spring Boot), Node.js, and/or Python (FastAPI), with a strong emphasis on contract‑first design (OpenAPI), backward compatibility, and service evolution
Practical experience with microservices architectures, including service decomposition and inter‑service communication
Strong understanding of REST, OAuth2, OIDC, JWT, and API gateway patterns
Experience with Docker and Kubernetes in real production systems
Experience with cloud platforms (AWS preferred) and CI/CD pipelines
Working knowledge of relational and NoSQL data stores (e.g., MySQL, Redis, MongoDB, DynamoDB)
Experience with monitoring, logging, and observability in distributed systems
Comfortable working in Agile teams (Scrum/Kanban)
Nice to Have
Experience with Event Streaming / Messaging platforms (Kafka, Kinesis, SNS/SQS)
Exposure to Micro Frontend architectures (Module Federation, single‑spa)
Experience with multi‑tenant and white‑label SaaS platforms
Familiarity with PHP‑based legacy systems and modernization efforts
Knowledge of accessibility (WCAG) and internationalization
Experience in healthcare, fitness, or regulated SaaS environments
Please note that only those selected for an interview will be contacted.
We appreciate you taking the time and look forward to reviewing your application!
WellnessLiving is proud to be an equal opportunity employer. We base employment decisions solely on qualifications, experience, and business needs. We do not tolerate discrimination or harassment of any kind. All qualified applicants will receive consideration without regard to race, color, religion, creed, gender, gender identity or expression, sexual orientation, national origin, disability, age, genetic information, veteran status, marital or family status, or any other status protected by applicable laws.
We utilize AI to generate summaries of interview notes as part of our candidate evaluation process. This helps ensure a fair and consistent review while maintaining a human‑centered hiring approach.
#J-18808-Ljbffr
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