Senior Software Engineer (.NET, REMOTE)

Map Ssg

6h•$170 - $200•Remote

About The Position

We’re looking for a Senior Software Engineer to lead development of our core payments platform. You’ll build and own systems for processing and reconciling money movement across multiple payment rails (ACH, credit card, wire), integrating with external payment processors and banking partners. This role drives secure, resilient, and compliant payment infrastructure used by our customers every day.

Requirements

6+ years professional software development
Strong experience with C#, .NET Framework & .NET Core
Hands-on ownership of payment processing systems (not just adjacent work)
Deep understanding of ACH, card payments, and wire transfer workflows
Experience building reconciliation systems across multiple data sources
Solid SQL skills (T-SQL, stored procs, performance tuning)
Experience integrating with payment APIs (Stripe, gateways, ACH processors)
Strong debugging skills across full stack and distributed systems
Clear communicator and collaborative problem-solver

Nice To Haves

Exposure to multiple processors or payment orchestration
FinTech/SaaS experience with high-volume payments
Azure cloud, queues/event systems, webhook architectures
SOC 2 / compliance framework familiarity

Responsibilities

Architect, build, and maintain scalable, secure payment systems
Own end-to-end payment workflows: initiation, processing, settlement, reconciliation
Design fault-tolerant, idempotent payment patterns and retry logic
Build monitoring, alerting, and automated reconciliation processes
Collaborate with finance, product, and support teams on payment operations
Mentor engineers on payment best practices and lead technical discussions with processor teams
Ensure PCI compliance, secure credential handling, and robust audit trails