Senior Software Engineer - Payments


San Francisco, CA, US
  • Job Type: Full-Time
  • Function: Engineering Software
  • Post Date: 01/01/2021
  • Website:
  • Company Address: Instacart 50 Beale Street, Suite 600, San Francisco, CA, 94105

About Instacart

Instacart is the North American leader in online grocery and one of the fastest-growing companies in e-commerce. Instacart’s same-day delivery and pickup services bring fresh groceries and everyday essentials to busy people and families across the U.S. and Canada in as fast as an hour. Since its founding in 2012, Instacart has become an essential service for millions of families, while also serving as an immediate, flexible earnings opportunity for hundreds of thousands of shoppers across North America. The company partners with more than 400 retailers and delivers from more than 25,000 stores across more than 5,500 cities in North America. Today, Instacart is accessible to more than 85% of households in the U.S. and more than 70% of households in Canada.

Job Description

The Orders & Payments team is responsible for payments processing, order lifecycle management, fraud prevention, and financial products that make it easier, safer, and more affordable for our customers to shop from their favorite local grocery stores. For this role, we are looking to hire strong engineers to grow our order management, payment processing, and fraud prevention teams. Millions of orders flow through our marketplace weekly. The services you design, implement, and deploy will process tens of millions of dollars in transactions daily. 

Why do we need you?

We are investing heavily in the next-generation of our services. At our velocity and volume-level we need the ability to deploy new products and features faster and better. That’s our choice for the traditional 3-dimensional engineering trade-off decision. We need our transactions to work perfectly; always. We can’t afford to spend time looking backward at legacy limitations in our systems. We need new architectural designs and new services that couple best-in-class engineering with highly-informed business knowledge!

Do you have exceptional experience with, aptitude for, or just interest in the following software engineering areas?

  • Payment Handling and Processor Integration (e.g. Stripe, ApplePay, GooglePay, PayPal, …)
  • Invoicing Tax Engine Integration: item taxes, service taxes, tax adjustments, and reporting
  • Invoice Discounting: first-party and third-party coupons; retention, growth, marketing discounts; …
  • Fraud-Prevention Services: protecting our customer orders, payments, and accounts
  • Core Order Lifecycle Engine: service-oriented design providing client and service-to-service integrations, synchronous and async integrations, guaranteed transactional integrity, strong auditibility, and extreme scalability

Join us and help Instacart grow!


  • Execute as part of a small team with significant ownership and autonomy over your projects
  • Design, implement, and ship high quality services with a strong sense of urgency and accountability
  • Work closely with product managers, designers, data scientists, and peer engineering teams to define and document project requirements and execution plans
  • Ensure that system designs including APIs, deployment architecture, and dependency selection result in highly scalable, robust solutions that minimize support costs and maximize an extraordinary customer experience
  • Contribute broadly to Instacart’s success by exercising your freedom to suggest and drive organization-wide initiatives

Instacart's technology is constantly changing and adapting. Some of the technologies you would use in our Orders, Payment, Invoicing, and Fraud teams at Instacart include:

  • Twirp RPC services defined by protobufs
  • Ruby on Rails framework leveraging Sorbet for strong-typing
  • Client-facing flexible APIs exposed via GraphQL
  • Postgres and Snowflake backend relational data stores
  • Async durable event handling infrastructure including async RPC via AWS SNS/SQS, RabbitMQ, etc
  • Caching and durable job dispatching using Memcached and Redis
  • Auto-scaling elastic service deployments built on AWS ECS, ALBs, and supporting cloud services
  • Rich monitoring and alerting infrastructure built on AWS Cloud Watch, DataDog, Rollbar, OpsGenie and supporting services
  • Any new integrations you will research, propose, implement, and deploy!

If you have experience with these technologies, you will have the opportunity to dive deeper. If you haven't used these technologies you will have the chance to learn from the collective experience of our team.


  • Self-motivation and an enjoyment for a startup environment
  • A strong sense of ownership
  • Strong knowledge of common back-end Web technologies (such as Ruby on Rails, Python, Twirp, GRPC, etc) in a production environment
  • An ability to balance a sense of urgency with shipping high quality and pragmatic solutions
  • Experience working with a large codebase on a cross functional team.
  • Strong knowledge of SQL
  • Bachelor’s degree in Computer Science, computer engineering, electrical engineering OR equivalent work experience
  • Experience and/or strong interest in payments, fraud prevention, order lifecycle management, invoicing, retail taxes, discounting, and financial products preferred
  • 5+ years of working experience in a similar field/environment

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Disclaimer: Local Candidates Only
This company does NOT accept candidates from outside recruiting firms. Agency contacts are not welcome.