Senior Full Stack Java Developer Jobs in Kitchener, ON

THE ROLE: Senior Full-Stack Developer

ABOUT YOU
You're a passionate and capable Senior Full-Stack Developer who enjoys building thoughtful, intuitive products and solving complex technical problems.

You get excited about creating user interfaces that make complex data easy to understand and act on. You're comfortable working across the stack, take ownership of your work, and thrive in a fast-paced environment alongside a small, highly skilled, and motivated team.

WHAT YOU'LL DO
Develop and maintain full-stack web applications, with a strong focus on intuitive, reliable, and responsive user interfaces.
Build REST APIs and backend services that support product features, data integrations, and customer-facing applications.
Turn complex WiFi sensing and technical data into clear workflows, insights, and visualizations.
Collaborate closely with engineering, product, design, and data science teams to design, test, release, and continuously improve scalable cloud-based features.
Write clean, maintainable, and well-tested code.
Help improve application performance, reliability, usability, and the long-term quality of our platform.

WHAT YOU'LL NEED
Bachelor's degree in Computer Science or a related field, or equivalent practical experience.
5+ years of professional software development experience, with strong experience in front-end development.
A team-oriented mindset with a willingness to take ownership and drive solutions forward.
Strong proficiency in React.js.
Strong proficiency in JavaScript/TypeScript and Node.js.
Hands-on experience designing and developing REST APIs.
Experience working with Docker and Docker Compose.
Experience with PostgreSQL.
Experience with automated testing frameworks such as Jest or Vitest.
Experience working in an Agile development environment, including JIRA and Git-based version control.

BONUS POINTS FOR
Experience with cloud technologies such as AWS and Kubernetes.
Experience with message brokers, and time-series databases.
Experience developing or supporting large-scale IoT platforms using MQTT.
Experience working with data-intensive applications, dashboards, or visualization tools.

Don't tick all the boxes? We believe motivation and growth potential are highly valuable characteristics in a job candidate.

WHY COGNITIVE SYSTEMS?
We're always looking for bright, highly motivated, and energetic people to join our team. We foster an open and agile environment where creative thinking, collaboration, and technical excellence lead to meaningful innovation.

We promote a healthy work-life balance in a flexible work environment and offer competitive salaries, an excellent extended health benefits plan, five weeks of paid annual time off, a fitness and wellness credit, and a free catered lunch in the office every day.

Most importantly, you'll have the opportunity to work on innovative technology designed to make a meaningful difference in people's lives.

ABOUT US
Caregiver by Cognitive brings an ambient layer of awareness to the connected home, helping people age in place with greater safety, independence, and peace of mind.

Led by founders with deep expertise in silicon design, radio-frequency technology, and Wi-Fi sensing, Cognitive Systems has built a leading patent portfolio in motion intelligence. Caregiver brings that technology into the aging-in-place market as a practical, deployable solution, turning passive signals into meaningful insights about daily living patterns, including activity, sleep, and unexpected inactivity.

Built for real-world deployment, Caregiver supports both turnkey applications and API-based integrations, enabling in-home care organizations to move beyond traditional emergency-response solutions. The platform is easy to install, scales across large customer populations, and adapts to both informal and professional caregiving environments, helping providers stay connected and act with confidence even when they cannot be physically present.

Cognitive Systems Corp. is committed to fostering a fair, inclusive, and respectful workplace. We are an equal opportunity employer and consider all qualified applicants without regard to race, colour, ancestry, place of origin, citizenship, creed or religion, sex, sexual orientation, gender identity or expression, age, marital or family status, disability, veteran status, or any other characteristic protected by applicable law.

We believe diverse perspectives and lived experiences strengthen our work and help us better serve our customers and communities.

Accessibility and accommodations: If you require an accommodation at any stage of the recruitment process, please emailcareers@cognitivesystems.com. A member of our team will respond, and any information shared regarding accommodation needs will be handled confidentially.