A profitable, 40-year-old US software company is modernizing its flagship point-of-sale platform - without the risky rip-and-replace.
Using a strangler-fig approach, a new Vue.js frontend sits over the existing SQL Server database, so customers adopt new functionality gradually instead of surviving a migration.
The original Java POS (2006present) stays in production; both products share one database by design.
You'll build the .NET API layer that makes it work.
What You'll Actually Work On
Build and own the .NET/C# APIs powering the new Vue.js app - services, business logic, auth, docs.
Take ownership of two existing microservices: Integration Hub (normalizes supplier/distributor APIs) and Communication Hub (email + SMS via SendGrid and Twilio).
Design integrations with suppliers, payment providers, and third-party partners.
Hit a hard low-latency bar on bare-metal Windows servers - heavy server-side caching, most reads from memory.
Shape architecture, coding standards, and API conventions with the lead architect.
Your First 90 Days
Ship your first production API endpoint into the Vue.js app, get deep on the Integration Hub's supplier-normalization layer, and own one recent supplier or partner integration end to end.
What We Need
8+ years of backend engineering with real depth - you've designed services, not just contributed to them.
Strong .NET/C# - or elite proficiency in another compiled backend language plus proof you learn new stacks fast.
Strong SQL and comfort working against a large, live production database you didn't design.
Microservices and third-party API integration at production quality.
Demonstrated performance engineering: memory optimization, caching, low-latency request paths.
Disciplined Git/DevOps habits; clear written and video communication in English.
AI-fluent and AI-skeptical - you move faster with AI, audit everything it produces, and write the hard 10% it can't.