Senior Software Engineer, Commerce Platform, Fullstack

Instacart

full-time

Posted on: 9/3/2025

Location: California, Colorado • 🇺🇸 United States

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💰 $162,000 - $217,000 per year

Senior

AWSGraphQLJavaScriptJestMochaPostgresReactRedisRubyRuby on Rails

About the role

Join the Commerce Platform team to help customers pay using preferred payment methods and benefits
Ensure seamless processing of millions of orders, credit card transactions, and invoice calculations daily
Work in a small, dynamic group that encourages ownership, collaboration, and continuous improvement
Collaborate closely with Front-End engineers, product managers, designers, internal and external partners
Engage in full-stack development with a server-driven client/server architecture
Maintain engineering standards, promote codebase consistency, and ship high-quality, scalable, robust solutions
Suggest and lead organization-wide initiatives to drive innovation and excellence

6+ years of software development experience
Solid experience in building web applications using HTML, CSS, Rails, and React.js (or comparable frameworks)
Strong understanding of UX principles and a keen eye for usability issues in web applications
Proficiency with front-end testing frameworks such as Jest, Mocha, or Enzyme
Familiarity with Ruby on Rails framework and experience using Sorbet for strong-typing
Experience working with client-facing flexible APIs exposed via GraphQL
Knowledge of backend relational data stores like Postgres and Snowflake
Experience with caching and durable job dispatching using tools like Memcached and Redis
Proficiency in building rich monitoring and alerting infrastructure using tools like AWS CloudWatch, DataDog, Sentry, and OpsGenie
Proactive and adaptable mindset with ability to research, propose, implement, and deploy new integrations
In-depth understanding of various payment systems and methods used in eCommerce (preferred)
Experience with order management systems (OMS) or eCommerce platforms (preferred)
Expertise in invoicing and billing processes within an ecommerce environment (preferred)
Experience with experiment frameworks and data-driven development (preferred)
Experience with cross-browser compatibility, accessibility, and building reusable front-end components or libraries (preferred)