Senior Software Development Engineer - .Net Technologies

The Product 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 new 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.

How We Work

• ~20 people, 40+ years in business, profitable, founder-led - zero venture funding, zero committees.
• Credo: build it right the first time.
• The PM prototypes UX with AI and ships to git; engineers productionize.
• AI is expected to multiply a senior engineer's output - and the engineer is expected to catch its mistakes, every time.
• You'll work with the lead architect, a same-time-zone Vue.js teammate, the Product Manager, a Senior Java Engineer joining alongside you, and the founder.
• Tooling: GitHub, dev/staging/production workflow, AI-assisted development with Cursor and Claude.

Hours

• IST with a ~2-hour evening overlap for the US team - roughly 5:308:30 PM IST (810 AM ET).

The Offer

• Long-term, multi-year engagement - not a gig.
• Full-time independent contractor, paid weekly in USD.
• 22 paid PTO/holiday/sick days.
• Small, senior team - real ownership and architectural influence, not ticket-shuffling.

(ref:hirist.tech)