Senior Full Stack Application Developer

Senior Full Stack Application Developer
Company: Wellness Living
Salary: $110,000 - $130,000 + Benefits + Vacation (exact placement within this range will depend on skills and qualifications)
Location: Thornhill, Ontario (hybrid)
Employment Type: Full-time, permanent

At Wellness Living, 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.

• 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.

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, Dev Ops, 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.

• 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 Fusion Auth; 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., Git Hub Actions, Terraform/Cloud Formation); 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…