About COSReady

COSReady is an early-stage technology company building an AI-powered beauty and wellness platform for salons, spas, med spas, wellness providers, pet groomers, and other service-based businesses.

Our web platform is already live and in pilot testing with real businesses and users. We are now preparing for the next stage of product expansion, including mobile app launch, booking optimization, merchant dashboard improvements, AI workflow features, notification systems, and payment-related functions.

We are looking for a Full-Stack & Mobile App Developer with strong backend, architecture, and implementation judgment. This is not a simple frontend role or isolated feature-ticket role. This position is best suited for someone who can both think architecturally and execute hands-on.

The right candidate should be able to understand an existing system, identify structural problems, improve architecture, and personally deliver clean, reliable production code across web, backend, and mobile. The role requires flexibility, ownership, and practical problem-solving. Requirements may change quickly based on real user feedback, and documentation may not always be complete. You should be comfortable clarifying requirements, identifying risks, suggesting better technical approaches, and executing without waiting for step-by-step instructions.

This position may start remotely, but it is not intended to remain a permanent remote role. As the product moves closer to mobile app launch and the team expands, the role will transition to fully on-site work in Toronto / North York. The right candidate should be comfortable with this arrangement before applying.

What You Will Work On

You will work directly on COSReady’s core product, including:

iOS and Android mobile app development
Beauty Map directory and merchant profile system
Customer-side discovery and booking experience
Business dashboard and merchant onboarding flow
Booking logic, service/staff/location structure, availability rules, and calendar workflows
Account system, authentication, permissions, role-based access, and multi-location support
Backend API structure, database models, and system reliability
AI workflow integration, including LLM API features and automation
SMS, email, notification, and reminder workflows
Payment-related features, third-party API integrations, and webhook handling
Deployment, testing, debugging, performance, and production stability improvements

Key Responsibilities

Review and improve the existing system architecture
Design clean backend structures, database models, API contracts, and permission logic
Build and maintain full-stack features across web, backend, and mobile
Develop and improve iOS / Android app features connected to the existing backend
Identify edge cases before implementation, not after users report problems
Write maintainable code with proper validation, error handling, and testing
Ensure frontend, backend, and mobile behavior are consistent
Improve system stability, scalability, security, and data consistency
Debug issues across frontend, backend, database, mobile app, and deployment layers
Work closely with the founder and other developers in a fast-moving startup environment
Take ownership of assigned work from requirement clarification to final delivery
Communicate clearly on progress, blockers, technical risks, and implementation decisions

Required Qualifications

MUST have 5+ years of professional software development experience
Strong backend development experience with Python / Django / REST APIs, or strong backend experience with the ability to quickly work in Django
Strong frontend experience with TypeScript, React, and Next.js
Experience building mobile apps for iOS and Android, preferably with React Native or Flutter
Solid experience with PostgreSQL or similar relational databases
Strong understanding of authentication, authorization, permissions, and data modeling
Experience connecting web and mobile applications to backend APIs
Experience building production applications, not only demos or school projects
Ability to debug across frontend, backend, mobile, database, and deployment layers
Comfortable with Git, code reviews, environment setup, testing, and deployment workflows
Able to work independently with limited hand-holding
Able to work remotely at the beginning, with the understanding that the role will transition to fully on-site work in Toronto / North York in the near future

Strong Assets

Experience with React Native, Flutter, Swift, Kotlin, or Java mobile development
Experience publishing or preparing apps for Apple App Store and Google Play
Experience with SaaS platforms, marketplaces, booking systems, CRM, admin dashboards, or multi-tenant systems
Experience with Stripe, Twilio, SMS workflows, payment logic, webhooks, or notification systems
Experience with OpenAI / LLM APIs, RAG, AI agents, or workflow automation
Experience with Docker, Linux, Nginx, GCP, AWS, CI/CD, logging, and monitoring
Experience improving an existing codebase rather than only building from scratch
Startup or 0-to-1 product experience

What We Are Looking For

We are especially looking for someone with a thorough, responsible, and detail-oriented implementation mindset.

This means you do not only complete the visible task. You also think through:

Whether the data model is correct
Whether the API structure is clean and maintainable
Whether permissions and user roles are handled properly
Whether API behavior is consistent across web and mobile
Whether edge cases may break the booking, account, payment, or notification flow
Whether frontend, backend, and mobile behavior are aligned
Whether errors, empty states, loading states, and validations are properly handled
Whether the feature works for real merchants and real users
Whether the implementation creates avoidable technical debt
Whether the app experience is stable enough for public launch

Speed and efficiency matters, but careless implementation creates more problems than progress. We value developers who are careful, practical, and responsible.

Startup Environment

COSReady is an early-stage startup. The role requires flexibility, ownership, and practical problem-solving.

Requirements may change quickly based on real user feedback. Documentation may not always be complete. You should be comfortable clarifying requirements, identifying risks, suggesting better technical approaches, and executing without waiting for step-by-step instructions.

This role is best suited for someone who can both think architecturally and execute hands-on.

Work Arrangement

Work Arrangement: Remote initially; will transition to fully on-site in Toronto / North York in the near future.

Interview Process

The hiring process may include:

Resume review
Brief phone screening
Zoom technical interview
Technical test or paid trial task
Final discussion and agreement

To Apply

Please submit your resume and, if available, include one or more of the following:

GitHub profile
Portfolio
Deployed project links
Mobile app examples
Code samples
Architecture examples
A brief description of a production system you personally built or significantly improved

Please also indicate:

Current availability
Earliest start date
Expected compensation
Work authorization status in Canada
Whether you are available for on-site or hybrid work in Toronto / North York

Pay: $50,000.00-$64,000.00 per year

Benefits:

Profit sharing
Stock options

Work Location: Remote

Job description