Software Engineer - Payments

Gables Search Group; Chicago (IL); On-site; USD 110,000 - 160,000; Full time

Job summary

Gables Search Group is seeking an experienced Software Engineer - Payments to develop secure, scalable payment services for a large, multichannel business. This hands-on backend role will work with C# and .NET while integrating processors, gateways, and third‑party platforms to support transactions across in-store POS, e‑commerce, mobile, kiosk, and call center environments.

Local candidates only in Chicago, IL; no visa sponsorship is available.

Qualifications

• 5–10 years of professional software engineering experience.
• Hands-on development with C# and .NET/.NET Core.
• Experience building REST APIs and integrating third-party platforms.
• Background with relational databases (SQL Server / PostgreSQL).
• Experience troubleshooting production or transaction-processing systems.
• Knowledge of secure development practices and data protection.

Responsibilities

• Build and enhance payment services and REST APIs using C# and .NET/.NET Core.
• Develop integrations with processors, gateways, acquiring banks, digital wallets, and external providers.
• Support authorization, capture, settlement, refunds, chargebacks, and transaction routing.
• Improve retry logic, exception handling, failover, observability, and transaction success rates.
• Troubleshoot production issues across applications, APIs, and third-party systems.
• Participate in solution design, code reviews, incident response, and root-cause analysis.
• Partner with Product, Architecture, and engineering teams to deliver reliable payment capabilities.
• Write secure, maintainable, well-tested code for business-critical systems.

Skills

C#

.NET

REST APIs

SQL Server

PostgreSQL

Payments experience

Troubleshooting

Tools

Kafka

RabbitMQ

Azure Service Bus

Job description

We are seeking an experienced Software Engineer - Payments to develop secure, scalable payment services for a large, multichannel business. This hands-on backend engineering role will support transactions across in-store POS, e-commerce, mobile, kiosk, and call center environments.LOCAL CANDIDATES ONLY to Bowling Green, KY or Chicago, IL. Will not sponsor. Must be legally authorized to work in the United States without current or future employer sponsorship. You’ll work primarily with C# and .NET while integrating payment processors, gateways, financial institutions, and other third-party platforms. The ideal candidate has payments experience or a strong background in high-volume transactional systems and wants to expand further into enterprise payment technology.

Responsibilities

• Build and enhance payment services and REST APIs using C# and .NET/.NET Core
• Develop integrations with processors, gateways, acquiring banks, digital wallets, and external providers
• Support authorization, capture, settlement, refunds, chargebacks, and transaction routing
• Improve retry logic, exception handling, failover, observability, and transaction success rates
• Troubleshoot production issues across applications, APIs, and third-party systems
• Participate in solution design, code reviews, incident response, and root-cause analysis
• Partner with Product, Architecture, and engineering teams to deliver reliable payment capabilities
• Write secure, maintainable, well-tested code for business-critical systems

Qualifications

• Roughly five to ten years of professional software engineering experience
• Strong hands-on development experience with C# and .NET/.NET Core
• Experience building REST APIs and integrating third-party platforms
• Background with SQL Server, PostgreSQL, or another relational database
• Experience troubleshooting complex production or transaction-processing systems
• Knowledge of secure development practices and sensitive-data protection
• Strong analytical, communication, and collaboration skills

Experience with payments, fintech, banking, retail commerce, POS, or another transaction-intensive environment is highly valued. Familiarity with PCI-DSS, EMV, tokenization, digital wallets, Kafka, RabbitMQ, Azure Service Bus, cloud platforms, or distributed systems is beneficial but not required.