Lead Software Developer - Performance Team (Platform Department)

Company Description

Acumatica is a company on a mission. We are a leading innovator in cloud ERP (Enterprise Resource Planning) solutions with growing businesses worldwide. But don’t take our word for it—read what analysts like G2, IDC, Nucleus Research, and Info-Tech have to say about us. Acumatica is different by design and purposely built to help small and midsized companies thrive in today’s digital economy. Our industry-specific business management solution is engineered to address real-world needs—featuring intelligent workflows and market-leading usability that enable companies to manage risk, anticipate disruption, and seize new opportunities. Our principled business practices, growth-friendly licensing, and flexible deployment options put organizations in control of their own future. Acumatica is more than just a product—we are a community of partners, customers, and creators committed to elevating business performance. Our ecosystem is driven by collaboration, merging leading technology and real-world insights to put organizations control of their future. In May of 2025, Acumatica was acquired by Vista Equity Partners, a global investment firm focused on enterprise software, data and technology-enabled businesses.

Acumatica’s culture is collaborative and high-energy. We are passionate about our product and our mission, and we are loyal to each other and our company. We value work/life balance, efficiency, simplicity, freakishly friendly customer service, and making a difference in the world. Acumatica offers exceptional professional and financial growth potential. To learn more about Acumatica’s mission, please visit: http://www.acumatica.com.

Acumatica is hiring a Lead Software Developer for our Performance Team (Platform Department) in Serbia, Belgrade!

Our team works on platform performance and resource efficiency for a SaaS ERP system: 100M+ requests per day, thousands of customer environments, hundreds of AWS EC2 servers, and diverse per-tenant workloads.

The team's scope includes production telemetry and monitoring, performance bottleneck identification, platform-level optimization, performance testing methodology, and automated analysis of thousands of crash dumps from production.

We also own the customization framework: the extension points through which third-party developers and customers adapt the product to specific business requirements. These customizations are a major source of behavioral and performance complexity in production.

Our product is a SaaS ERP system used by thousands of small and mid-sized businesses across the United States to run their core operations, including sales, inventory, and finance, with a customer base that continues to grow rapidly. The platform is under active development, and the technology stack is continuously kept current.

The product is split between the platform and application modules. The platform implements its core subsystems in-house: the customization engine, reporting, workflow, and a proprietary ORM with first-class support for MS SQL Server, PostgreSQL, and MySQL. Application modules encapsulate domain-specific business processes such as CRM, distribution, and financials.

Job Description

What You'll Do In this role:

• Your work will be split roughly 30/70 between product support within the team's ownership area — third-line tickets, performance incident investigation, and defect fixes — and building new platform features and optimizations.
• You will own platform feature development end to end: technical design, implementation, merge procedures, and maintenance primarily on the web backend.
• You will work with Business Analysts on detailed specifications and with QA engineers throughout delivery.
• You will run peer reviews and hold the bar on technical design, code quality, maintainability, and performance.

Tech stack: C# / .NET / SQL Server

A few concrete examples of our projects:

We investigate customer performance incidents using telemetry, logs, and production artifacts to locate the cause of degradation or crashes. On the tooling side, we are building AI agents that automatically analyze logs, telemetry, and memory dumps to accelerate this work.

Performance benchmarking is an open methodological problem: customer workloads vary widely in usage patterns, and customer databases differ in size and structure. Keeping the benchmark suite representative under that variance is what we are working on.

AI tools, including Claude Code, are part of day-to-day development and routine task automation.

AI capabilities inside the product are a current direction. The most concrete piece is AI-assisted tooling for the large body of customer customization code that extends the platform.

Among other directions, we work on developer tooling, code parsers, static analysis, code quality enforcement, and platform extensibility for third-party plugins.

Our work is planned and estimated in advance, tasks are well defined, and we do not operate through constant context-switching or overtime.

Qualifications

We are looking for candidates who can demonstrate:

• 7+ years of professional software development experience with .NET, C#, and MS SQL Server, primarily in backend web applications.
• At least 2 years in a senior or lead engineering role.
• Experience at a product company with a sizable, mature engineering organization.
• Experience working on ERP, CRM, accounting, document management, or other business systems.
• Independent experience designing and developing platform-level functionality.
• Experience building custom components or infrastructure where standard libraries and off-the-shelf solutions were not sufficient.
• Genuine interest in the internal mechanics of the technologies you use: the .NET runtime, database servers, and related infrastructure.
• Hands-on experience with performance profilers, memory profilers, performance optimization, memory dump analysis, performance incident investigation, and telemetry analysis.
• Demonstrated ownership: acting as a technical driver for projects end to end.
• Awareness of the business impact of technical decisions, not just their technical merit.

Bonus points for:

• Experience with cloud technologies, particularly Azure or AWS.
• Experience using AI tools for development productivity and code quality.
• Experience integrating AI functionality into software products.
• Experience designing extensibility frameworks and plugin systems.
• Experience with code parsers, static analysis, or developer tooling.

Additional Information

**The title and salary will be discussed with a successful candidate depending on the level of experience. 
***We are open to work from home, hybrid or fully on site working model from our office in Belgrade depending on the candidate's preference

We offer:

• Private health insurance
• Performance bonuses
• Full work equipment (Laptop, mouse, headphones, etc)
• Great opportunities for career growth
   

Acumatica is an Affirmative Action and Equal Opportunity Employer/Veterans/Disabled. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.
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