Full Stack Developer (Junior/Intermediate)

• 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 [email protected].
• A cover letter is optional, but we'd welcome a short note on why this role interests you.