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Senior JavaScript Engineer (Full-stack, Retention)

2 days, 5 hours ago
Portugal
Full-time
Senior
Frontend Engineer / Web Developer
Software Development
AWS Datadog JavaScript MySQL React REST API Serverless Shopify SQL TypeScript
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Relay Commerce

Relay Commerce

Relay Commerce operates as an e-commerce software holding company that acquires and operates exceptional SaaS businesses, providing solutions to scale and grow faster on leading e-commerce platforms like Shopify.

Internet Software & Services
11-50
Founded 2021
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Description

  • Design, build, and operate serverless TypeScript services for high-volume subscription and billing systems.
  • Own product features end-to-end, from shaping requirements and proposing architecture through implementation and production monitoring.
  • Develop REST APIs and integrations with Shopify and Klaviyo ecosystems.
  • Contribute to React-based front-end applications and API-connected user experiences.
  • Use AI coding agents, build MCPs, and develop AI features that enable LLM integrations.
  • Participate in architecture discussions and technical decision-making across Relo and Relay Commerce.
  • Support Customer Success through the escalation schedule and maintain live production systems.
  • Improve engineering processes, guidelines, and documentation in a fully remote organization.

Requirements

  • 8+ years of senior-level JavaScript and TypeScript experience across multiple companies and frameworks.
  • Experience owning and delivering major product features from idea through production.
  • Deep TypeScript expertise, including class-oriented design, strong typing, SOLID principles, OOP patterns, and test-driven development.
  • Extensive experience designing REST APIs, particularly for third-party platform integrations.
  • Strong SQL and relational database knowledge, including query performance, indexing, and schema design in MySQL or another RDBMS.
  • Proficiency with React, including interactive components, application state management, and backend API integration.
  • Experience with AWS cloud-native services; experience with AWS Lambda and Prisma ORM is relevant.
  • Ability to use AI agents such as Claude Code and Codex effectively; knowledge of MCPs, RAG, and AI tooling.
  • Experience with predictive algorithms, Shopify platform data, and SRE or observability tools such as DataDog is preferred.
  • Strong written and verbal communication, customer focus, and ability to collaborate with non-engineering stakeholders.

Benefits

  • Flexible time off.
  • Public holidays off.
  • Paid parental leave.
  • Work-from-home stipend.
  • Therapy and mental health reimbursement.
  • Co-working space allowance.
  • Company swag.

Interested in this position?

Apply directly on the company website

Apply Now

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