Sr .Net Developer / Team Lead

Denver, CO

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Title: Senior .Net Developer/Team Lead

Location: Denver, CO


Our client is looking for a Senior .Net Developer/Team Lead who has built or maintained an ISO 8583 issuer/processor for card transactions. Must be familiar with mobile payments API architectures (ApplePay, GooglePay, MDES), and 3rd Party Single Sign-On architecture for both internal and external users. 

This role will need a hands-on developer with skills in helping and working with others (communication, collaboration, and coordination). Must be able to show or describe previous work and level of involvement in those projects. 

Our client’s business is API driven and will eventually migrate to the cloud. Experience with Azure, AWS, or other could native systems will be a plus. Their operation is five 9’s, so building redundant 24/7/365 availability is crucial. The ideal candidate will be able to articulate complex logic to Clients and Partners in simple terms.


  • Write and review high-performance back-end APIs and services code in C#
  • Design and document the APIs and services you help build
  • Collaborate with front-end teams and external partners
  • Maintain and improve existing APIs and services


  • 5+ years experience with C#
  • Advanced experience with MS SQL Server in a high-performance environment
  • Experience with ISO 8583 integrations
  • Experience with single and dual ISO 8583 messages
  • Strong understanding of processing settlement and reconciliation data
  • Experience with mobile payment API architectures (ApplePay, GooglePay, MDES), and 3rd Party Sign-On architecture for both internal and external users
  • Familiarity with both credit an debit platforms with complex cardholder householding structures
  • Experience with the MIP (MasterCard Interface Processor) and the NYCE (An American Debit network)
  • Experience building distributed systems with web services
  • Knowledge of RESTful constraints
  • Experience wit writing/monitoring/scaling enterprise systems
  • Experience with automate dtsting
  • Experience with continuous intergration and DevOps

Bonus Experience:

  • .Net Core
  • MSMQ
  • ISO 20022 integrations
  • Cloud Native Systems
  • Loyalty Card Processing