Senior Full Stack Developer

Quartermaster inc.; Toronto; On-site; CAD 150,000 - 190,000; Full time

Benefits offered by this job

30 days PTO

Health/dental/wellness

Tech allowance

Parental leave

Job summary

Quartermaster inc. in Toronto is seeking a Senior Full stack Developer to deliver high-quality, scalable software across frontend and backend. The role focuses on building performant UIs, robust APIs, and data-flow modeling while integrating services for complex features.

Working with product, design, and engineering, you will guide architecture decisions, lead technical implementation, and mentor others on best practices for reliability, usability, and long-term maintainability.

Qualifications

• Architect and implement scalable fullstack apps using modern JS/TS stacks.
• Design and optimize relational and non-relational data models for transactional consistency.
• Build robust API layers (REST/GraphQL/gRPC) with validation and auth middleware.
• Implement SSR/ISR/SSG for frontend performance and SEO benefits.
• Lead architecture decisions and mentor teammates toward best practices.

Responsibilities

• Architect and implement scalable, maintainable, observable fullstack applications.
• Collaborate with product, design, and engineering to drive architecture decisions.
• Mentor others and raise code quality, performance, and developer experience.
• Balance hands-on coding with systems thinking for long-term reliability.
• Deliver high-quality software with measurable improvements in usability and performance.

Skills

Frontend development

Backend development

Architecture & design

Mentoring

Product mindset

Tools

React

Next.js

Node.js

Express

NestJS

PostgreSQL

MySQL

MongoDB

DynamoDB

Redis

REST

GraphQL

gRPC

Redux Toolkit

Zustand

React Query

SSR

ISR

SSG

Webpack

Vite

Babel

SWC

OpenTelemetry

Honeycomb

Prometheus

StatsD

Pino

Winston

WebSockets

SSE

GitHub Actions

CircleCI

ArgoCD

Job description

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.

ROLE SALARY BAND

$150,000 - $190,000

ROLE OVERVIEW

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.

TEAM VALUES

Integrity - We prioritize integrity over comfort, convenience, and the short-cuts of success that drive metrics but undermine trust.

Trust - We cannot win unless we win on trust. Trust is hard to earn and easy to lose. We need to be built for it in our DNA.

Competitiveness - We believe that competitiveness is a critical complement to integrity and trust. If we're not our customer's best choice, then we're wasting their time. We believe in the power of healthy competitive markets, and we believe we need to be uniquely competitive to win in this space. We have too much respect for the other players in this space to expect things to be easy. That's a good thing.

Empowerment - Any win we achieve needs to be first and foremost a win that we deliver to others, starting with our customers, and their long term best interests.

VACATION AND BENEFITS

We know the power it takes to be successful in a challenging mission and we want to ensure our team is rested and ready to go.

• 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.

EMPLOYEE OWNERSHIP:

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 YOU WILL BE DOING

Technical Execution & Ownership

• 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, ephemearal previews, and rollback mechanisms
• Integrate cloud-native capabilities like