React developer Jobs in North York, ON

Pay at Intact is about much more than just salary.

• Flexible work arrangements and a hybrid work model

• Possibility to purchase up to 5 extra days off per year

• Multiple benefits offered to support physical and mental wellbeing, including telemedicine, Wellness account and much more

• Share plan & other savings: up to 12% of salary or even more (ask how you could earn guaranteed income for life)

Salary range (but not limited to):

101,800 - 124,400

Annual bonus target, based on the base salary, with a potential payout of up to double the target (subject to personal and company performance):

12%

As part of our commitment to Win As A Team, we share our success with employees through our annual bonus plan and Employee Share Purchase Plan (ESPP) – with Intact matching 50% of your net shares.

Our pension offerings provide flexibility and long-term security for our employees beyond their careers. We are one of the few companies offering the opportunity to receive guaranteed income for life via our defined benefit pension plan.

Salary for the candidate will be determined taking into consideration a number of factors including: experience, skills, qualifications, anticipated contribution to role, internal equity, etc. The salary range presented above is based on a 35-hour workweek and would represent a majority of different candidate profiles. However, we encourage candidates who may fall outside of this range to apply as well.

About the role

We're looking for a Senior Full Stack Developer to join our high-performing team building our Internal Developer Portal that accelerates software delivery across the enterprise. This is a fast-paced, high-impact role where you'll own features end-to-end — from React frontends to Spring Boot microservices — and ship code that developers depend on daily.

What you'll do here:

Backend (Spring Boot / Java)

• Design, build, and operate Spring Boot 3 microservices (Java 17/21) within a distributed architecture that includes event orchestration, event processing, notification, work-item tracking, file upload (AWS S3), and service discovery (Eureka).

• Own database schema evolution using Liquibase against PostgreSQL, and write performant JPA/Hibernate queries with Hypersistence Utils for advanced column types.

• Implement and extend our custom workflow/flow engine built on Spring Integration, including authoring reusable event tasks (Git, GitHub Enterprise, Jira, SSH, email) and worker services.

• Harden security across services using Spring Security, OAuth2 (client + resource server), JWT (jjwt), Azure AD SSO, and HashiCorp Vault for secrets management.

• Build and maintain the API Gateway (Spring Cloud Gateway WebMVC) that fronts all backend services.

• Produce clean, self-documenting APIs with Springdoc OpenAPI (Swagger UI) and HATEOAS where appropriate.

Frontend (React / TypeScript)

• Develop and ship features across a Turborepo monorepo containing multiple single-page applications using React 19, TypeScript, and Vite.

• Build rich, accessible UIs with Material UI, Material React Table and D3-based data visualizations.

• Manage client-side state with Zustand and TanStack React Query; consume both REST and GraphQL APIs (URQL).

• Write thorough unit tests with Vitest + Testing Library and end-to-end tests with Playwright; maintain high code coverage via V8 coverage reporting.

• Contribute to a shared component library and design system documented in Storybook; enforce code quality with ESLint, Prettier, Knip (dead-code detection), Husky, and lint-staged.

Cross-Cutting

• Champion code quality through peer code reviews, Checkstyle, Spotless formatting, SonarQube analysis, and JaCoCo coverage gates.

• Ship containerized services via Docker multi-stage builds, Helm charts, and Jenkins CI/CD pipelines targeting OpenShift (ROSA), with integrated Nexus IQ, Twistlock, and Polaris security scanning.

• Write comprehensive JUnit 5 unit tests, Spring Boot integration tests, and WireMock-based service tests on the backend; maintain Playwright E2E suites on both Java and JavaScript sides.

• Collaborate closely with product owners and fellow engineers in an agile environment with frequent release cadences.

• Mentor and guide junior developers, drive technical decisions, and contribute to architecture discussions for a platform that is actively scaling.

What you bring to the table:

Must-Have

• 8+ years of professional software development experience with a strong full stack track record.

• Deep hands-on expertise with Java 17+ and the Spring ecosystem (Spring Boot 3, Spring Security, Spring Data JPA, Spring Cloud).

• Production experience building modern React applications with TypeScript, including state management (Zustand, React Query, or equivalent) and component libraries (MUI or similar).

• Solid understanding of relational databases (PostgreSQL), schema migration tools (Liquibase or Flyway), and ORM frameworks (Hibernate/JPA).

• Experience with RESTful API design, OpenAPI/Swagger, and at least working knowledge of GraphQL.

• Proficiency with containerization (Docker), CI/CD pipelines (Jenkins, GitHub Actions, or similar), and Kubernetes or OpenShift deployments.

• Strong testing discipline — you write unit, integration, and E2E tests as a matter of course (JUnit 5, Vitest, Playwright, WireMock).

• Undergraduate degree in Computer Science or any equivalent combination of education and experience.

Nice-to-Have

• Experience with Spring Cloud Gateway, Netflix Eureka, or similar service-mesh/discovery patterns.

• Familiarity with Helm chart authoring and OpenShift/ROSA operations.

• Hands-on experience with HashiCorp Vault, OAuth2/OIDC flows, and Azure AD integration.

• Exposure to monorepo tooling (Turborepo, pnpm workspaces) and build optimization (Vite, SWC).

• Experience with workflow/orchestration engines or Spring Integration.

• Comfort with MkDocs, Storybook, or other developer-experience documentation tooling.

• Familiarity with AWS S3 and the AWS SDK for Java.

Who thrives on this team:

• You take initiative and run toward problems, not away from them.

• You communicate clearly and directly — in PRs, in design docs, and in person.

• You're energized by fast iteration, tight deadlines, and the accountability that comes with shipping a platform other teams depend on.

• You care deeply about code quality, developer experience, and leaving the codebase better than you found it.

• You're comfortable context-switching between backend and frontend work within the same sprint.

• For candidates located in Quebec, bilingualism is required considering the necessity to interact on a regular basis with English-speaking colleagues across the country.

• No Canadian work experience required however must be eligible to work in Canada.

#LI-Hybrid

Ce poste jouera un rôle essentiel au sein de notre équipe. | This position will fill an essential role in our team.