Full-Stack Engineer (Contract - Part-Time)

mello (YC S21); Toronto; On-site; USD 100,000 - 150,000; Part time

Job summary

A leading start-up is looking for a Full-Stack Engineer to enhance employee wellbeing through technology. This role involves a blend of UI development and back-end integration, aiming to scale a platform for up to 1 million users. The ideal candidate will have strong technical skills, a passion for collaboration, and the ability to adapt to a rapidly changing environment.

Qualifications

• 2+ years in Full Stack Development required.
• Experience in DevOps preferred.

Responsibilities

• Responsible for both front-end and back-end development.
• Ensure scalability from 1,000 to 1 million users.
• Contribute to engineering values, processes, and deployment.

Skills

IAM / OAuth

React.js

Vue.js

CSS

API Development

Database Experience

Education

Bachelor's in Computer Science

Job description

About Us

mello is a Y Combinator (S21) backed start-up that integrates wellbeing into every employee's workflow to unlock their full potential. We are paving the path for the future of work. Our vision is to help every remote team on the planet work healthier, more sustainably, and learn how to stay mello instead of burning out.

As second time founders, we burnt out building our last company during the pandemic. We wanted a simple, easy-to-use solution that integrates seamlessly into workflows to enhance wellbeing but couldn’t find anything suitable, so we built the solution we’d like to use ourselves.

At mello, we’re creating the new standard for remote and hybrid companies to track, measure, and act on burnout, inspiring happier, healthier, and more motivated teams. Our platform suggests smart actions for employees, managers, and HR to boost wellbeing, productivity, and retention.

About this Role

As a modern Full-Stack Engineer, you are proficient across all aspects of development—from hardware components to web applications, including browsers, OS, CPU, RAM, and architecture. At mello, our requirements are even more comprehensive:

• You will be responsible for both front-end UI elements and experiences, as well as integrating and maintaining backend services as needed. The expected split is approximately 63.5% front-end and 37.5% back-end.
• You will ensure the application can scale from 1,000 to 1 million users.
• You will contribute to defining our engineering values, processes, and deployment cadence, with a focus on scalability and security.

Technical Skills you should have:

• IAM / OAuth (e.g., AWS Cognito, Okta)
• Frontend frameworks such as React.js (Hooks preferred), Vue.js
• In-depth CSS knowledge (SCSS, Sass)
• Experience with third-party integrations including OAuth, SDKs (e.g., AWS SDK), and API backends (BFF)
• Development, improvement, and maintenance of custom API backends
• Experience with SPA cloud deployment (AWS S3 / Amplify, Netlify, Firebase is a plus)
• Database experience (a plus)

What you’ll be doing

• Working with modern frontend frameworks like React.js (Hooks), Vue.js, and Gatsby; familiarity with analytics is a plus.
• Implementing OAuth flows and integrating with third-party services.
• Deploying front-end applications using services like AWS Amplify, Netlify, or Firebase.
• Designing data fetching and caching strategies, understanding tradeoffs, principles, and practices to guide technical decisions.
• Applying Test Driven Development with frameworks like Jest.
• Integrating and developing APIs, troubleshooting CORS issues.
• Experience with databases is a plus.
• Building secure software to protect user information.

Who you are

• You are passionate about our mission: unlocking human potential through wellbeing and the future of work.
• You are excited about joining an early-stage growth startup.
• You have a growth mindset.
• You’re willing to learn beyond engineering skills.
• You care deeply about UX and design quality.
• You ask “yes, and?” and thrive in collaborative environments.
• You’re curious about how UX designers and researchers work and how your role integrates with theirs.
• You are proactive, problem-solving, and a go-getter.
• You are a team player, curious, and self-motivated.
• You can take and give constructive feedback.
• You adapt quickly to change.

Job Details

• Type: Contract (Part-Time)
• Hours: Up to 30 hours/week
• Pay: $100,000 - $150,000 USD
• Education: Bachelor's in Computer Science (preferred)
• Experience: 2+ years in Full Stack Development (required), 1+ year in DevOps (preferred)