Senior Backend Engineer - AI-First, SaaS Platform Lead

Remote Jobs; United States; Remote; USD 92,000 - 120,000; Full time

Job summary

Jonas Software is at the start of building a brand-new, highly visible SaaS application. We’re seeking a Senior Software Engineer with an AI-first mindset to shape the technical foundation, set engineering standards, and ship core capabilities in a cloud-native environment.

You’ll design and implement backend services in C#/.NET, apply patterns like Event Sourcing and CQRS, work with AWS, PostgreSQL, RabbitMQ, and Docker, and mentor teammates while advancing an agentic AI-driven development

Qualifications

• AI-first mentality with practical experience using AI tools to accelerate development.
• Senior-level experience building production systems with C#/.NET.
• Hands-on experience with Event Sourcing and CQRS in real-world systems.
• Strong working knowledge of Domain-Driven Design (DDD).
• Experience with Vertical Slice architecture (or similar modular service boundaries).
• Solid experience with PostgreSQL.
• Experience with asynchronous messaging and integration patterns, ideally RabbitMQ.
• Experience containerizing services with Docker.
• Experience building/operating cloud-hosted applications, ideally on AWS.
• Familiarity with agentic AI concepts (autonomous workflows, tool-using agents, orchestration, evaluation/guardrails) and excitement to apply them in day-to-day engineering.
• Strong ownership mindset: you ship, you improve, you operate, you lead.

Responsibilities

• Own major components of a new SaaS platform from design through production.
• Build event-sourced, CQRS-based services in C#/.NET using DDD principles.
• Design clean domain models, message contracts, and integration patterns using RabbitMQ.
• Deliver cloud-ready solutions using Docker and AWS (deployment, observability, reliability).
• Apply an AI-first approach to engineering: agentic AI tools, automated workflows, code generation/review, test generation, and productivity accelerators.
• Partner with product and engineering leaders to define architecture, standards, and delivery practices.
• Write high-quality, well-tested, maintainable code and raise the bar through reviews and mentorship.

Skills

AI-first mindset

C#/.NET

Event Sourcing

CQRS

DDD

Vertical Slice

PostgreSQL

RabbitMQ

Docker

AWS

Agentic AI concepts

Ownership mindset

Tools

MartenDB

Wolverine

Job description

Jonas Software is at the start of building a brand-new, highly visible SaaS application. We’re seeking a Senior Software Engineer with an AI-first mindset to shape the technical foundation, set engineering standards, and ship core capabilities in a cloud-native environment.

You’ll design and implement backend services in C#/.NET, apply patterns like Event Sourcing and CQRS, work with AWS, PostgreSQL, RabbitMQ, and Docker, and mentor teammates while advancing an agentic AI-driven development