Svitla Systems Inc. is looking for a Senior Software Engineer for a full-time position (40 hours per week) in Argentina. Our client offers a comprehensive suite of billing, payments, and software solutions for professional services firms.

Requirements

Front-end experience

Strong production experience with React, including modern hooks, suspense, and patterns.
Advanced TypeScript and modern JavaScript. You write code that other engineers can read, extend, and trust.
Solid grounding in performance, accessibility (WCAG), responsive design, and component architecture.
Experience with enterprise component libraries (MUI, Radix UI, Shadcn) and data-heavy UI is a plus.

Back-end Experience

Strong production experience in .NET / C# (.NET 8 or later), building RESTful APIs and microservices following API-first principles.
Strong knowledge of SQL Server, T-SQL, schema design, query performance tuning, and Entity Framework / ADO.NET.
Experience with cloud platforms. AWS preferred (Lambda, ECS, RDS, SQS, S3, CloudWatch). Azure equivalents are fine.




Architectural judgment on service boundaries, async messaging, caching, and consistency trade-offs.

Full-stack bar

5+ years of professional software engineering experience, with at least 2+ years of meaningful full-stack work. You’ve shipped features end-to-end, not just thrown code over the wall in either direction.
Comfort being primary owner of a feature across both stacks. You don’t need a separate engineer to write the API for your UI or vice versa.
Payments experience (strongly preferred)
Hands-on Stripe integration in production. Embedded Checkout and Payment Element on the front. PaymentIntents, payment method cloning, refunds, and webhook handling on the back.
Stripe Connect experience is a strong differentiator. Connected account creation, embedded onboarding components, direct charges, KYC and persons, capability and requirements webhooks, and payout bank attachment. Marketplace flows and multi-merchant architectures

📌 SENIOR SOFTWARE ENGINEER (Argentina)
🏢 Svitla Systems
📍 Argentina