Senior Front-End Engineer

Smile.io is the world’s largest loyalty platform, providing easy-to-use reward programs that help scaling ecommerce brands transform one-time sales into repeat purchases from loyal customers. Over 100,000 brands use Smile to turn transactional purchases into passionate repeat shoppers.

We currently power over 100,000 rewards programs, reaching more than 500 million customers, and serving 1 million API requests per hour. Our primary stack is Ruby on Rails, Ember.js, and React.

The engineering team  believes in being proud of your code, owning what you ship, and embracing new tools to increase developer happiness. We believe small and agile empowered teams can ship products with the highest impact.

We are looking for a highly skilled and experienced Senior Full Stack Engineer with specialization in Front-End development and a solid understanding of Back-End development to join our dynamic team. As a key member, you’ll play a crucial role in designing, constructing, and maintaining our shopper-facing applications and merchant-facing program management tools, ensuring their quality, reliability, scalability, and performance. You will actively participate in running experiments and building incrementally, working in an agile environment to drive innovation and deliver outstanding outcomes.

This is a full-time remote role working in Canada, Monday to Friday, with significant overlap with 9 AM - 3 PM EST.

About the Program Squad
The Program Squad is a team that spans the entire technical stack, and is focused on providing the functionality merchants need to create and manage effective loyalty programs. They are responsible for building and maintaining features that influence repeat purchase rates, optimizing program configuration, enhancing the shopper journey, and improving the merchant experience. The team takes an iterative and experimentation-based approach to crafting functionality that delights users and feels native to the Shopify platform.

What You’ll Work On

Write, test, instrument, document, and maintain software for Smile.io.

Review code and provide thoughtful, constructive feedback for your team.

Collaborate closely with Product, Design, and Engineering teams to build new features.

Support a highly available service used by millions of users on a daily basis. Champion productive technical discussions and foster collaboration within the team.

Our Tech Stack

User Facing Applications:

Ruby on Rails

Ember.js

React

Typescript

HTML

CSS

Services:

Ruby

Data Layer

PostgreSQL

Elastic Search

Kafka

Amazon Simple Queue Service

Snowflake

Metabase

Environment &

Infrastructure:

Git Hub

Data Dog

Amazon Web Services

Terraform

Vault

Helm

Kubernetes

Who You Are

Possess a minimum of 5 years of technical experience in software engineering or a related field, with senior-level expertise in Front-End development and hands-on experience across the full stack.

Have expert-level proficiency from professional work experience in modern Front-End frameworks (Ember.js and/or React using Type Script)

Have working proficiency in back-end development, with experience building, maintaining, and debugging server-side systems.

Have experience with Ruby on Rails or another back-end framework/language (e.g., Node.js, Python, etc.);
Ruby on Rails experience is highly valued but not required.

Have experience using AI tools to solve real-world engineering problems: improving developer productivity, code quality, and product outcomes.

Curious, adaptable, and excited about how AI is reshaping software development.

Skilled in utilizing observability tools such as Data Dog and Grafana to troubleshoot multi-system level issues effectively.

Experienced with Postgres or similar databases.

Experienced in building and maintaining high-traffic systems.

Experienced in test automation practices.

Familiar with agile methodologies and the ability to thrive in a fast-paced environment.

✅ You'll Be Successful In This Role If You

Care deeply about writing maintainable code

Communicate clearly and thoughtfully in writing

Have good product instincts and can balance quality, scope, and speed

Prefer pragmatic, iterative decision-making over perfectionism

Are comfortable learning through research…