Senior Application Developer

About Teifi

Teifi Digital, a Shopify Plus Platinum partner, excels in resolving complex e-commerce challenges. We focus on integrating large catalogs, sophisticated data frameworks, and legacy systems into seamless unified commerce and B2B solutions, delivering unparalleled customer experiences. Our skill in deploying Shopify Plus caters to top-tier merchants in manufacturing, parts, distribution, retail, and B2B, ensuring minimal technical debt and maximized e-commerce revenue.

An AI-Forward Workplace
AI is embedded in how we work. Our team regularly uses AI tools to enhance productivity, streamline processes, and deliver better outcomes. Candidates joining us should be comfortable leveraging AI as part of their day-to-day workflow and open to developing their skills as these tools evolve. Familiarity with AI tools is a plus; a willingness to learn and adapt is a must.

As part of our hiring process at Teifi Digital, any offer of employment is conditional upon the successful completion of a background check.

Role Overview

We are seeking a Senior Application Developer focused on building high-performing e-commerce solutions with expertise in web and Shopify app development. In this role, you will build custom microservices, private apps, and integrations for our clients, as well as contribute to the development of Teifi Labs products. You will be responsible for back-end development using TypeScript, Node.js, PostgreSQL, Redis, GraphQL, and REST APIs, while also contributing to front-end work using React where necessary. A strong track record in Shopify Plus customizations and third-party app integrations. Skilled at delivering scalable, responsive experiences optimized for both performance and usability..

Key Responsibilities

• Build and maintain backend integrations, microservices, and private apps
• Work with TypeScript, Node.js, PostgreSQL, GraphQL, and REST APIs
• Integrate third-party platforms like ERPs, WMS, and POS systems
• Contribute to a modern monorepo setup and internal tooling
• Support frontend (where necessary) with React, Shopify Polaris, and Remix
• Design, build, and maintain integrations across APIs, webhooks, and middleware to connect systems and streamline data flow
• Manage and configure backend integrations with ERP and PIM systems, ensuring reliable performance and scalability
• Lead data migration projects end-to-end, including data mapping, transformation, and validation to ensure accuracy and integrity
• Architect and deliver end-to-end technical solutions, translating business requirements into scalable, well-structured designs
• Drive project delivery using Agile and sprint-based methodologies, keeping stakeholders aligned and work on track
• Collaborate with global teams using GitHub, Linear, and Notion
• Participate in sprints, scoping, code reviews, and team discussions
• Troubleshoot and resolve technical issues, particularly in app integrations and customizations for Shopify Plus clients
• Contribute to the continuous improvement of our development processes and app infrastructure
• Maintain comprehensive documentation, including technical specifications and Standard Operating Procedures (SOPs)
• Provide on-call support as required
  
  

Qualifications

• 4–6 years of experience as a backend or full stack developer
• A degree in Computer Science or a closely related field
• Strong in TypeScript and Node.js
• Solid knowledge of PostgreSQL, REST APIs, GraphQL
• Experience working with scalable integrations and backend architecture
• In-depth knowledge of Shopify's architecture, APIs, and app ecosystem
• Experience integrating third-party services such as ERPs, WMS, and POS systems with Shopify
• Hands-on Shopify experience (themes, apps, Liquid, Shopify APIs) strongly preferred
• Strong problem-solving skills and attention to detail in building scalable, secure applications
• Ability to work both independently and as part of a collaborative team in a remote/hybrid environment
• Proactive mindset and a collaborative working style
• Comfortable working in a fast-paced, remote-friendly engineering culture
  
  

Benefits & Perks

• Ongoing professional development through training programs, certifications, and peer mentorship.
• Hybrid work model depending on role, with a Granville Island office and free on-site parking.
• Flexibility in work hours designed to accommodate appointments and personal responsibilities.
• Comprehensive health and dental coverage in Canada, plus a health spending account.
• Paid office closure between Christmas and New Year’s.
• Regular team culture events, stocked office snacks, and a dog friendly workplace.
• Performance based bonus opportunities for full-time employees.

We are an equal opportunity employer and love diversity at our company! We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, or disability status.