Sr. Software Engineer (Payments & Data)

Qu-Pos; United States; Remote; USD 150,000 - 190,000; Full time

Job summary

Qu is hiring a Senior Software Engineer to own both sides of its payments stack, building integrations that process transactions and a data platform that makes them visible for merchants. You will join a scaled agile team across geographies, working on cloud-based architectures that handle high-volume restaurant payments daily.

You will drive PSP integrations, terminal-to-cloud payment flows, and the reconciliation platform, while mentoring engineers and contributing to code quality across

Qualifications

• 7+ years in software development with meaningful payments or financial data exposure.
• 5+ years in C# / .NET building APIs and microservices.
• Hands-on PSP integration experience: gateway APIs, terminal APIs, management APIs, webhook notifications.
• EMV terminal integration: device pairing, transaction flows, certification, in-store troubleshooting.

Responsibilities

• Translate business requirements into working solutions; mentor engineers; maintain documentation and runbooks.
• Participate in code reviews and drive code quality across payment services.
• Build and maintain payment integrations with PSPs across card-present and card-not-present channels.
• Own terminal-to-cloud payment flows: device initialization, transaction processing, Store & Forward, and webhook-based reconciliation.
• Create payment analytics dashboards and reports for merchant back-office users.
• Design matching engines and data pipelines that ingest settlement files and classify exceptions.

Skills

Payments domain

API design

Microservices

Data reporting UI

Code reviews

Tools

Vue.js

Angular

React

MongoDB

SQL

Elasticsearch

AWS

Job description

At Qu you will:

Work on building the leading enterprise restaurant technology platform (POS, kiosks, digital ordering). We're looking for a Senior Software Engineer who can own both sides of our payments story: building the integrations that process transactions, and building the data platform that makes those transactions visible and reconciled for our merchants.

You’ll join a scaled agile team distributed across multiple geographies, working on cloud-based and cloud-hybrid architectures that process high-volume restaurant payments daily.

Payment Processing & Integration

• Build and maintain payment integrations with PSPs across card-present (EMV terminal) and card-not-present (hosted/online) channels
• Own terminal-to-cloud payment flows: device initialization, transaction processing, Store & Forward, and webhook-based reconciliation
• Serve as a subject matter expert across the full payment stack, from terminal hardware through gateway to settlement
• Build the reconciliation platform (UI and back-end) that matches POS transactions against PSP settlement/payout records and surfaces discrepancies
• Design matching engines and data pipelines that ingest settlement files, normalize records, and classify exceptions (voids, partial refunds, abandoned checks, offline payments)
• Create payment analytics dashboards and reports (PAR insights, payout exports, transaction drill-downs) for merchant back-office users

Technical Leadership

• Translate business requirements into working solutions; mentor engineers; maintain documentation and runbooks
• Participate in code reviews and drive code quality across payment services

What We’re Looking For:

• 7+ years in software development with meaningful payments or financial data exposure
• 5+ years inC# / .NETbuilding APIs and microservices
• Hands-on PSP integration experience: gateway APIs, terminal APIs, management APIs, webhook notifications
• EMV terminal integration: device pairing, transaction flows, certification, in-store troubleshooting
• Fluency in payment domain concepts: acquirers, issuers, settlement (gross/net), chargebacks, PCI DSS, tokenization, PAR, authorization vs. capture, Store & Forward
• Experience buildingdata reporting UIs(Vue.js, Angular, or React) that present financial data to non-technical users
• Experience withdata reconciliation logic: cross-system matching, discrepancy identification, exception classification
• AWSservices: ECS, SQS, DynamoDB, RDS, CloudWatch, Parameter Store
• MongoDBand SQL databases
• Elasticsearchor similar for transaction data querying

Bonus:

• EBT payment processing or gift card systems
• Restaurant/QSR industry experience
• Mobile wallets (Apple Pay, Google Pay)
• International or multi-merchant payment platforms
• Terminal management and remote diagnostics

Who You Are

• High ownership across both code and data. You don’t treat the reporting side as someone else’s problem.
• Financially precise. You understand that off-by-one-cent errors in reconciliation have real business impact.
• Comfortable bridging payment infrastructure engineering and data/reporting needs in the same sprint.
• Strong communicator who can explain payment flows to both engineers and business stakeholders.
• Strategic thinker who balances immediate fixes with long-term platform goals.
• Intellectually curious, willing to push new approaches to payment and data problems.