As a Principal .NET Software Engineer, you'll modernize payment infrastructure, enhance scalability and security, and lead design discussions while ensuring cross-functional collaboration.
About Versapay 🚀
Versapay turns accounts receivable (AR) into a competitive advantage.
Inefficient AR processes slow cash flow and stall growth. Versapay removes friction, unlocks working capital, and accelerates momentum — giving finance leaders the clarity and control they need to drive business forward.
Versapay automates accounts receivable, removing barriers to collecting and reconciling B2B payments. Our solutions connect finance teams, customers, and business systems in one ecosystem to ensure cash flow clarity. With over 10,000 customers and 5M+ companies transacting on the platform, Versapay processes over 110M transactions and $257B annually.
Think you might be the next Veep to join? Read on!!
We are looking for an experienced .NET Principal Software Engineer to evolve and modernize our payments infrastructure, improve scalability and security, and design new distributed services where they add the most value. You’ll have meaningful ownership over critical payment services and the opportunity to influence technical direction across the platform.
You’ll contribute to an established payments platform that our customers use every day, with opportunities to strengthen its architecture and extend its capabilities. You’ll partner closely with Product, Security, Compliance, and Operations, and collaborate with other teams to move shared initiatives forward creating a better experience for our customers.
What You'll Do:
- Platform & Architecture:
- Own and evolve core payment services for online (CNP), device-based EMV (CP), digital wallets (e.g., Apple Pay, Google Pay), and payment facilitator/orchestration flows.
- Modernize and improve existing components into more cloud-native, distributed architectures using containers on AWS/Azure.
- Own and extend end-to-end payment workflows: authorization, capture, void, refund, tokenization, clearing, funding, settlement, and multi-source reconciliation.
- Expand capabilities for international payments, including multi-currency and cross-border flows.
- Integrate with payment service providers (PSPs), EMV card readers, and device SDKs using secure, standards-based messaging.
- Improve and maintain CI/CD pipelines in GitHub Actions (automated builds, tests, security scans, packaging, deployments).
- Design and evolve test automation strategy, covering domain-level logic, API contracts, and integration with external processors and devices.
- Strengthen platform reliability through observability (metrics, logs, traces), fault-tolerant design, and automated operational workflows.
- Partner with Product, Security, Compliance, and Operations to deliver features that balance customer experience, regulatory requirements, risk, and operational robustness.
- Mentor engineers, lead design and architecture discussions, and influence the long-term strategy for the payments platform.
Payment Flows:
Delivery & Reliability:
Collaboration & Leadership:
What You'll Bring
- Significant experience (typically 10+ years) of professional engineering with expert proficiency in C#, .NET, and SQL. · Deep experience in payments: online payments, EMV device-based transactions, digital wallets (e.g., Apple Pay, Google Pay), PayFac/orchestration flows, bank account rails (ACH/EFT), and international/multi-currency payment flows.
- Proven ability to modernize production financial systems into cloud-native, distributed architectures
- Familiarity with monitoring and observing distributed systems using modern observability tooling
- Proven ability to work cross-functionally with Product, Security, Compliance, and Operations, and to represent engineering effectively to non-technical stakeholders
- Experience using AI-assisted development tools to enhance productivity and code quality
- ISO 8583 transaction messaging
- ISO 20022 data models and payment messaging
- DUKPT key-management and secure device cryptography
- Hardware Security Modules (HSMs) and secure key lifecycle
- EMV payment kernels and card/device authentication flows
- Modern API and integration design (RESTful services), asynchronous messaging/queueing, caching, event-driven architecture, high-availability patterns
- AWS or Azure, containerization, orchestration, and CI/CD automation
- PCI-DSS, encryption, tokenization, key-rotation, and secure coding principles
- Experience with multi-region cloud architecture and distributed data patterns
- Experience with modern UX/front-end development (e.g., JavaScript/TypeScript)
Deep hands-on experience with several of the following:
Strong knowledge of:
Nice to Haves:
#LI-Remote
We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.
Top Skills
.Net
AWS
Azure
C#
Ci/Cd
Dukpt
Github Actions
Hsms
Iso 20022
Iso 8583
JavaScript
Pci-Dss
SQL
Typescript
Similar Jobs
Artificial Intelligence • Productivity • Software • Automation
As a Business Development Representative at Zapier, you will generate qualified leads, educate prospects on AI solutions, and optimize outreach strategies.
Top Skills:
AIAPIsAutomation
Artificial Intelligence • Productivity • Software • Automation
Lead the Personalization Platform team, focusing on building and maintaining Zapier's personalization infrastructure and enhancing user engagement through tailored experiences.
Top Skills:
AlgoliaGraphQLNext.JsNode.jsPythonTypescript
Big Data • Fintech • Mobile • Payments • Financial Services
The Content Enablement Manager leads the creation of sales materials, provides competitive insights, and collaborates cross-functionally to enhance Affirm's market messaging and storytelling.
Top Skills:
Analytics ToolsCompetitive Intelligence ToolsRfp Software
What you need to know about the Los Angeles Tech Scene
Los Angeles is a global leader in entertainment, so it’s no surprise that many of the biggest players in streaming, digital media and game development call the city home. But the city boasts plenty of non-entertainment innovation as well, with tech companies spanning verticals like AI, fintech, e-commerce and biotech. With major universities like Caltech, UCLA, USC and the nearby UC Irvine, the city has a steady supply of top-flight tech and engineering talent — not counting the graduates flocking to Los Angeles from across the world to enjoy its beaches, culture and year-round temperate climate.
Key Facts About Los Angeles Tech
- Number of Tech Workers: 375,800; 5.5% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: Snap, Netflix, SpaceX, Disney, Google
- Key Industries: Artificial intelligence, adtech, media, software, game development
- Funding Landscape: $11.6 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Strong Ventures, Fifth Wall, Upfront Ventures, Mucker Capital, Kittyhawk Ventures
- Research Centers and Universities: California Institute of Technology, UCLA, University of Southern California, UC Irvine, Pepperdine, California Institute for Immunology and Immunotherapy, Center for Quantum Science and Engineering
