Software Engineer II – Mid-Level

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Jonas Software

WebsiteLinkedInAll Job Openings

1001 - 5000 employees

Jonas Software is the leading provider of enterprise management software solutions to over 40 different vertical markets. Within these vertical markets, Jonas has acquired over 160 unique and innovative companies.

📋 Description

• Build and maintain backend services for a new SaaS platform using C#/.NET • Contribute to event-sourced and CQRS-based application features • Apply Domain-Driven Design principles with guidance from senior engineers • Implement clean, maintainable domain logic, APIs, message handlers, and integrations • Work with PostgreSQL, RabbitMQ, Docker, and AWS-based services • Write automated tests and use AI-assisted tools to help generate, review, and improve test coverage • Use AI-first engineering practices, including code assistance, documentation support, workflow automation, and productivity tooling • Participate in code reviews and provide thoughtful, constructive feedback • Collaborate with product, design, QA, and engineering teammates to deliver reliable features • Troubleshoot issues in development and production environments with support from the team • Contribute to engineering standards, documentation, and team best practices • Take ownership of assigned features from development through deployment

🎯 Requirements

• Professional experience building production software with C#/.NET • Solid understanding of backend development, APIs, data persistence, and service design • Working knowledge of Event Sourcing and CQRS, or strong interest with some hands-on exposure • Familiarity with Domain-Driven Design concepts such as aggregates, entities, value objects, and bounded contexts • Experience building modular applications using Vertical Slice architecture or similar patterns • Experience working with PostgreSQL or another relational database • Familiarity with asynchronous messaging or event-driven systems; RabbitMQ experience is a plus • Experience using Docker for local development or service containerization • Exposure to cloud-hosted applications, ideally AWS • Practical experience using AI development tools to support coding, testing, documentation, debugging, or code review • Interest in agentic AI concepts such as tool-using agents, automated workflows, orchestration, evaluation, and guardrails • Ability to work independently on defined tasks while asking good questions when needed • Strong communication skills and a collaborative engineering mindset • Commitment to writing clean, tested, maintainable code.