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Added 28 mins ago
MN
System Engineer
Matchtech North America
Toronto, ON · Greater Toronto Area, Canada
- Full-time
As a Requirements Lead, you’ll play a pivotal role in delivering large-scale rail infrastructure projects. You’ll lead requirements management activities across the full project lifecycle…
Added 28 mins ago
MN
Communications Consultant
Matchtech North America
Toronto, ON · Greater Toronto Area, Canada
- Full-time
Our client, a leading player in the rail industry, is looking for a talented Communications Engineer/Designer to join their dynamic team on a permanent basis. This role involves designing…
Added 28 mins ago
MN
Systems Integration Lead
Matchtech North America
Toronto, ON · Greater Toronto Area, Canada
- Full-time
…optimized systems engineering processes to the delivery of infrastructure…
Added 28 mins ago
MN
Electrical Engineer
Matchtech North America
Toronto, ON · Greater Toronto Area, Canada
- Full-time
Our client is seeking a Senior Electrical Engineer to join an established rail and transit team delivering clean, efficient and reliable electrification infrastructure across Canada. The…
Added 29 mins ago
UO
Project Manager, WUSA
University of Waterloo
Waterloo, ON · General Services Complex
- Full-time
WUSA operates a diverse range of student-facing services and facilities within this infrastructure, primarily located in the Student Life Centre (SLC) or within the University of Waterloo…
Added 29 mins ago
SB
Senior Hydraulics and Capacity Engineer
South Bow
Calgary, AB · Manulife Place
- Full-time
We are seeking a Senior Hydraulics and Capacity Engineer to provide technical leadership and strategic oversight of operational capacity management for South Bow's crude oil pipeline…
Added 45 mins ago
M
Senior Full Stack Java Engineer
Miratech
Canada
- Full-time
We are looking for a Senior Full Stack Engineer to design, develop, and support scalable cloud-native applications that power Workforce Management (WFM), Customer Experience (CX), and…
Added 59 mins ago
SL
Geomatics/Geospatial Manager/Principal Engineer, Strategy & Innovation (Capability Building)
Singapore Land Authority (SLA)
SK
- Full-time
…facilitating knowledge exchange to advance Singapore's GE&G infrastructure and…
Added 1 hour ago
M
Senior Full Stack Java Engineer
Miratech
Canada
- Full-time
We are looking for a Senior Full Stack Engineer to design, develop, and support scalable cloud-native applications that power Workforce Management (WFM), Customer Experience (CX), and…
Added 1 hour ago
V
Senior Firmware & FPGA Engineer, SST Control
Verdyn
Oakville, ON
- $110,000 to $160,000 CAD / year
- Full-time
Verdyn is a Canadian designer and manufacturer of power-electronics based solutions for critical infrastructure. Our advanced electrical systems solve challenges for customers in demanding…
Added 1 hour ago
U
Senior Software Engineer, Applied AI & Customer Solutions
Udemy
Toronto, ON
- Full-time
As a Senior Software Engineer, you will join a fast-paced innovation team that builds and deploys AI-powered solutions directly with Coursera's enterprise and campus customers. You will sit…
Added 1 hour ago
V
Embedded Firmware Engineer - Energy Storage (Controls & Connectivity)
Verdyn
Oakville, ON
- Full-time
Role Description The Embedded Firmware Engineer - Energy Storage (Controls & Connectivity) will design, implement, and maintain embedded software for Verdyn’s energy storage products and…
Added 1 hour ago
Software Engineer, Web3 Backend
Robinhood
Toronto, ON
As a Software Engineer, you’ll build and own backend services, infrastructure, and data systems that support Robinhood’s next-generation crypto, web3, and wallet offerings. You’ll develop…
Added 1 hour ago
A
Licensing Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
Intermediate Geotechnical Engineer
AtkinsRéalis
Calgary, AB
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
Rail Infrastructure Co-op Student - Winter 2027
AtkinsRéalis
Vancouver, BC
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
Senior Geotechnical Engineer
AtkinsRéalis
Toronto, ON · Vaughan, ON
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
Co-op Student (winter 2027)
AtkinsRéalis
Ottawa, ON
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
HSE Advisor
AtkinsRéalis
Toronto, ON
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
Specialist Engineer - Process
AtkinsRéalis
Mississauga, ON
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
Rail Transit Systems Engineer-In-Training
AtkinsRéalis
Vancouver, BC
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
Senior Piping Supports Design Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
Registered or eligible to be registered as a Professional Engineer in the Province of Ontario (mandatory requirement).
Added 1 hour ago
A
Senior Piping Stress Analyst Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
Registered or eligible to be registered as a Professional Engineer in the Province of Ontario (mandatory requirement).
Added 1 hour ago
A
Piping Stress Analyst Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…
Added 1 hour ago
A
Piping Supports Design Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
…connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants,…

Reactiv

Full Stack Developer (Junior/Intermediate)

Toronto, ON, M5A 1M3, Canada

Full-time

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Job details

Job type: Full-time
Experience: ● Roughly 2 to 4 years of experience building web applications, or equivalent project
Posting language: English
Posted: Oct 6, 2026

Original job description

Full Stack Developer Junior / Intermediate

About Reactiv

Reactiv is an AI-powered platform that helps Shopify merchants build beautifully branded, high-converting mobile apps without the usual complexity. At the core of what we do is Reactiv Clips, a feature that removes the need for app downloads so brands can deliver fully customized app experiences instantly and without friction. By lowering the barrier to great mobile experiences, we're building the future of mobile commerce, and we're growing our engineering team to help shape what comes next.

About the Role

We're looking for a Junior to Intermediate Full Stack Developer to help build and improve the platform our merchants rely on every day, from the dashboard they use to design and manage their apps to the e-commerce APIs that power them. You'll ship real features from early on, with support and mentorship from our engineering team to help you grow. Most of your work will be in TypeScript across React on the frontend and Node.js on the backend, with the chance to go deeper on whichever side excites you most. This is a hands-on role for someone earlier in their career who wants to develop into a strong full stack engineer in a collaborative, hybrid environment. You don't need to check every box below; if you're solid on the fundamentals and eager to learn the rest, we want to hear from you.

What You'll Do

Build and maintain features across our merchant dashboard React and TypeScript) and our backend services and e-commerce APIs Node.js and TypeScript).
Write and consume RESTful and GraphQL APIs that connect our frontend experiences to server-side functionality.
Work with relational databases such as Postgres: designing simple schemas, writing queries, and learning optimization along the way.
Contribute to our Shopify integrations that keep merchant data in sync.
Collaborate with product, design, and other engineers to define, design, and ship new features.
Help keep the platform fast and reliable by improving performance and responsiveness on both sides of the stack.
Take part in code reviews, both giving and receiving feedback, as part of how we maintain quality.
Troubleshoot and fix issues across the stack to improve the experience for merchants.

What We're Looking For

Required

Working knowledge of React and a solid grasp of its core concepts.
Some experience building backend services or APIs with Node.js.
Comfortable writing TypeScript, or strong JavaScript with a willingness to pick up TypeScript quickly.
An understanding of how frontend and backend talk to each other: RESTful APIs, requests, responses, and error handling.
Familiarity with relational databases such as Postgres or MySQL.
Strong problem-solving instincts and eagerness to learn in a fast-moving, collaborative team.
Roughly 2 to 4 years of experience building web applications, or equivalent project and portfolio work.

Nice to Have

Experience with GraphQL.
Familiarity with the Shopify ecosystem, or an interest in ecommerce.
Exposure to AWS services Lambda, S3, RDS, DynamoDB or other cloud infrastructure.
Experience with a React framework such as Next.js or React Router (formerly Remix).
Experience writing automated tests Jest, React Testing Library, or integration tests).
Understanding of authorization concepts such as OAuth and JSON Web Tokens.
Familiarity with CI/CD practices.
Exposure to React Native, or interest in contributing to mobile.

Why Join Us

Mentorship and growth: You'll have regular code review, pairing, and support from experienced engineers, with a clear path from junior to intermediate and beyond.
Level up with AI We're constantly exploring how AI can make us better engineers, and you'll have real freedom to experiment with cutting-edge tools rather than wait for permission. It's a fast way to grow.
Real impact: The features you build are used by merchants running their businesses around the world.
Hybrid work environment: We believe in a hybrid model to create opportunities for intentional in-person collaboration (and mentorship) while balancing that with the deep focus time that comes from working remotely. You'll join the team in our Toronto office 2 to 3 days a week with the flexibility to work remotely the rest of the time.
You're an owner: Every engineer at Reactiv gets equity, so you share in the upside you help create. You're not just building the product, you own a piece of it.
Benefits from day one: Extended health and dental coverage that kicks in the day you start, no waiting period.
Unlimited PTO We take time off seriously here. Most of our engineers take around three weeks a year, and more when they need it, and we actively encourage stepping away to rest and protect against burnout.

How to Apply

Send your resume and any project links, portfolio, or GitHub profile to careers@reactiv.ai. A cover letter is optional, but we'd welcome a short note on why this role interests you.

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More about this job

Responsibilities

You will build and maintain features across the merchant dashboard and backend services using TypeScript, React, and Node.js. Additionally, you will collaborate with product and design teams to ship new features while ensuring platform performance and reliability.

Requirements

The role requires 2 to 4 years of experience with React, Node.js, and TypeScript, along with a solid understanding of RESTful APIs and relational databases. Strong problem-solving skills and an eagerness to learn in a collaborative, fast-moving environment are essential.

Skills

TypeScript
React
Node.js
Postgres
RESTful APIs
GraphQL
Shopify
JavaScript
AWS
Next.js
React Router
Jest
React Testing Library
OAuth
CI/CD

Benefits

Equity
Extended health coverage
Dental coverage
Unlimited PTO

Visa sponsorship

Not detected in the job text

Keywords

Full Stack Developer
TypeScript
React
Node.js
Shopify
RESTful APIs
GraphQL
Postgres
MySQL
AWS
Lambda
S3
RDS
DynamoDB
Next.js
React Router
Jest
React Testing Library
OAuth
JSON Web Tokens
CI/CD
React Native
Mobile Commerce
Engineering
Hybrid Work
Equity
Mentorship
AI
Web Applications
Software Development

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