Senior Full Stack Developer - Web Platform

Sago Mini

15h•$65 - $85•Hybrid

About The Position

Sago Mini is seeking a Senior Full Stack Developer to play a leading technical role on their Web Store team. This position will drive the development of a new Direct-to-Consumer (DTC) web channel, focusing on building and enhancing scalable web store services that complement the existing App Store subscription infrastructure. The role is ideal for a senior candidate with strong technical skills who enjoys collaborating in cross-functional teams to support product and marketing initiatives. This is a 6-month contract position requiring 35-40 hours per week, with flexibility for remote work across Canada or a hybrid arrangement in Toronto. Both options require adherence to core hours of 10 am-5 pm EST/EDT. The anticipated salary range is $65 to $85 per hour, dependent on factors such as experience and education.

Requirements

Proficiency in AI-powered software engineering, including embedding AI coding tools (e.g., GitHub Copilot, Claude, Codex) into daily workflows for development acceleration, code quality improvement, and task automation.
Senior-level full-stack experience (5+ years) in building, scaling, and maintaining complex web applications and services from concept to launch.
Deep expertise in TypeScript for both frontend and backend development.
Hands-on experience building backend services with JavaScript-based frameworks (e.g., NestJS, Express).
Experience designing schemas with PostgreSQL.
Extensive experience with modern frontend frameworks (e.g., React, Next.js, Vue).
Strong understanding of server-side rendering, state management, responsive design, and web performance optimization.
Excellent communication skills, with the ability to translate technical concepts for product and design partners and build trust within a shared-service team.

Nice To Haves

E-commerce and subscription domain knowledge, including experience building or integrating e-commerce storefronts, payment processing systems, and subscription billing lifecycles.
Cloud infrastructure experience, including deploying and running web services in the cloud (AWS).
Solid grasp of modern open-source stacks and SaaS development tools (testing, monitoring, CI/CD).
Ability to thrive in an autonomous environment as a contractor, taking ambiguous requirements, asking clarifying questions, and delivering shipped features quickly and reliably.

Responsibilities

Drive the execution of a new web store initiative, serving as the lead technical contributor for the Piknik subscription plan's new web storefront.
Build major components from payment integration to analytics, ensuring features are fast, responsive, and highly secure.
Develop both user-facing frontend elements and backend services for authentication, account management, and subscription routing.
Architect and build secure, scalable integrations with third-party payment gateways (e.g., Stripe, GTM) and internal subscription management services.
Collaborate closely with the Web Platform team, including the Engineering Manager and platform developers, participating in sprints, design reviews, and code reviews.
Prioritize simple, scalable solutions, evaluating technical trade-offs daily, with a focus on payment security and data integrity.
Ensure quality and reliability by writing clean, testable code, implementing monitoring, and utilizing CI/CD pipelines for deployments to AWS infrastructure.