Senior JavaScript Engineer, Full-stack, Retention

🕒 September 17

🇵🇹 Portugal – Remote

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

👻 Ghost score 10%

What it means: the chance that no one is really hiring for this job.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Relay Commerce

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2021

📣 Marketing

💼 Consulting

📦 Logistics

💰 $20M Debt Financing on 2022-04

Marketing • Consulting • Logistics

Relay Commerce is an e-commerce platform that provides a comprehensive suite of tools designed to help online retailers grow their businesses. With solutions that focus on building trust through social proof, growing subscriber lists, and boosting conversion rates, Relay Commerce empowers merchants to enhance their online presence and sales. Their offerings include user-generated content, email and SMS marketing, and analytics tools that integrate seamlessly with popular e-commerce platforms like Shopify.

📋 Description

• Design and evolve TypeScript services powering personalized replenishment, cross-sell, and subscription offers for Shopify stores • Work as part of an AI-native, multidisciplinary product engineering team to deliver modern software across high-volume subscription and billing systems • Design and deliver serverless TypeScript services on AWS Lambda, backed by MySQL and Prisma ORM • Contribute to React applications relying on company APIs and integrating with Shopify and Klaviyo • Own features end-to-end, from shaping customer problems and proposing architecture through implementation, monitoring, and production operation • Support Customer Success through a working-hours escalation schedule and maintain the live production system • Participate in architectural discussions and technical decision-making across Relo and Relay Commerce • Add agent context to codebases, run coding agents, build MCPs, and develop AI product features for LLM integrations such as Shopify Sidekick • Improve processes, guidelines, and documentation in a fully remote organization

🎯 Requirements

• Significant, proven, senior-level experience with JavaScript across multiple frameworks; minimum of 8 years across multiple companies • Extensive experience designing REST APIs, especially for systems integrating with third-party platforms • Deep expertise crafting TypeScript using class-oriented design, strong typing, SOLID principles, OOP patterns, and test-driven development • Strong SQL and relational database knowledge, including query performance, indexing strategies, and schema design in MySQL or another RDBMS • Clear proficiency with React, including components, interactive UI, application state, and backend API integration • Experience with cloud-native services in Amazon Web Services • Experience owning features from idea to delivery • Experience defining and shipping major features as part of a team • Ability to use AI agents such as Claude Code or Codex and explain skills, MCPs, RAG, and other AI tooling • Excellent written and verbal communication skills • Customer focus • Highly desirable: Experience with predictive algorithms • Highly desirable: Experience with Shopify platform, structures, and data • Highly desirable: Experience with SRE practices and observability tools such as DataDog

🏖️ Benefits

• Flexible Time Off • Public Holidays Off • Paid Parental Leave • Work From Home Stipend • Therapy/Mental Health Reimbursement • Co-working Space Allowance • Company Swag

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