Senior Full Stack Developer

Quartermaster inc. • Toronto, ON

24d • $150,000 - $190,000 • Hybrid

About The Position

We’re building Toronto’s dedicated platform for home management to empower the city’s homeowners and to better connect our neighbours and the local Pros they trust.

Our focus is purely on the GTA market right now. We build our property base one street at a time, and our marketplaces one neighbourhood at a time. We’re a local tech company in every sense of the word. We start with integrity, neighbourhood values, and competitive craftsmanship, and we build our business on neighbourhood trust.

We believe in holistic solutions to consumer problems. We believe in high-trust hyperlocal communities. We believe in low commission marketplaces that the best Pros can actually say yes to. And we believe that tech companies should go to work for the locally loved Pros of the GTA rather than trying to get those Pros to effectively work for the tech company. We believe that it’s good business to care. We believe that this problem space deserves a form of digital transformation that the people and Pros of Toronto can trust and invest in.

If this resonates with you and you’re at a point in your career and your life where you want to do something uniquely difficult for a meaningful outcome, you’ve found your next home.

The Senior Full stack Developer is a key contributor responsible for delivering high-quality, scalable software across the frontend and backend. This role involves building performant UIs, designing robust APIs, modeling data flows, and integrating services that support complex product features.

Working closely with product, design, and engineering teams, the developer drives architecture decisions, leads technical implementation, and mentors others on best practices. They balance hands-on execution with systems thinking, consistently improving code quality, performance, and developer experience. The ideal candidate pairs deep technical skill with a strong product mindset and a focus on reliability, usability, and long-term maintainability.

You show up like an owner.
You want to value the equity and solve for others.

Requirements

• Candidates should have 6+ years of fullstack experience, with 2+ years leading technical projects or teams.
• They must be fluent in JavaScript or TypeScript, with strong proficiency in React and backend development using Node.js or similar.
• Experience building APIs, modeling data, and deploying to cloud infrastructure is essential.
• They should be confident owning architecture decisions, mentoring teammates, and collaborating across design, product, and engineering.
• Familiarity with accessibility standards, performance optimization, and secure coding practices is expected.
• The ideal candidate delivers scalable, user-focused solutions and thrives in fast-paced, cross-functional environments.

Responsibilities

• Architect and implement scalable, maintainable, and observable fullstack applications using modern JavaScript/TypeScript ecosystems (React, Next.js, Node.js, Express/Koa, NestJS)
• Design and optimize relational (PostgreSQL, MySQL) and non-relational (MongoDB, DynamoDB, Redis) data models to support transactional consistency, efficient querying, and multi-tenancy
• Build robust API layers (REST/GraphQL/gRPC), incorporating input validation, rate limiting, auth middleware, pagination, and real-time event streaming via WebSockets or SSE
• Construct flexible state management patterns (Redux Toolkit, Zustand, React Query) across web applications for efficient data hydration, caching, and optimistic UI
• Implement progressive rendering strategies (SSR, ISR, SSG) to balance performance and SEO within frontend frameworks like Next.js
• Manage frontend build tooling and transpilation (Webpack, Vite, Babel, SWC), including module federation, code-splitting, and lazy loading optimizations
• Develop backend services with clean architecture principles (domain-driven design, hexagonal ports/adapters), enforcing separation of concerns and enabling high testability
• Instrument frontend and backend code with structured logging (Pino, Winston), distributed tracing (OpenTelemetry, Honeycomb), and metrics (Prometheus, StatsD) for proactive debugging and performance tuning
• Build automated deployment pipelines for both client and server with CI/CD tools (GitHub Actions, CircleCI, ArgoCD), including staging environments, ephemeral previews, and rollback mechanisms
• Integrate cloud-native capabilities like object storage (S3), job queues, messaging systems (Kafka, NATS), and container orchestration (Docker, Kubernetes)
• Make full stack architectural decisions balancing developer productivity, system scalability, and product roadmap velocity
• Collaborate with product, design, and QA to define technical requirements and delivery plans, including accessibility, internationalization, and performance
• Align frontend and backend concerns via shared contracts (e.g. GraphQL schema, OpenAPI specs) to drive consistency and testability
• Facilitate cross-team decisions for shared infrastructure, deployment pipelines, and development standards
• Transparently communicate tradeoffs and drive alignment across stakeholders on architectural risk, effort, and technical debt remediation
• Mentor junior and mid-level engineers in front-end and mobile development, accessibility, and system design principles
• Lead code reviews, architecture sessions, and cross-platform design discussions with a focus on performance and accessibility
• Support team learning through documentation, knowledge-sharing, and feedback-driven growth
• Advocate for accessibility and mobile quality in engineering culture and product planning
• Drive backlog refinement, estimation, and sprint planning across cross-functional squads with fullstack responsibilities
• Own release readiness for features, including end-to-end testing, canary rollout strategies, and post-deployment observability
• Establish and maintain CI/CD pipelines for web and backend services using GitHub Actions, CircleCI, or similar tools
• Integrate code coverage, static analysis, and test automation into delivery pipelines to support velocity without sacrificing stability
• Continuously improve team workflows via retrospectives, tooling improvements, and process experimentation

Benefits

• We offer 30 days of PTO annually, which can be used for vacation, personal days, or illness. Five of these days are designated as company-wide closures around the start and end of the year.
• In addition, our benefits plan covers health, dental and wellness to add that extra pep in our step, and help us sleep at night.
• We have a tech allowance benefit to help set you up for work.
• We have pregnancy and parental leave policies, and we’re ready to support your family’s next stage of growth.
• We’re a team on a mission. We expect a high degree of ownership from each other and we pair that with higher than usual employee ownership in the company.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 11-50 employees