Staff II Software Engineer - C#

About the role

BlackLine is looking for an accomplished Staff II Software Engineer with 15+ years of software engineering experience, focused on Agentic AI, Generative AI systems and large-scale software engineering. This is a senior individual contributor role combining architectural leadership with hands-on execution: you will guide and unblock a team of Staff Engineers and Technical Leads while driving design and delivery of the Invoice-to-Cash platform.

Key responsibilities

• Own end-to-end architecture and build highly extensible, modular applications, driving the long-term evolution of the Invoice-to-Cash platform
• Architect the agentic AI system: agent registry, policy engine, metrics ingestion pipeline, anomaly detection and human-in-the-loop orchestration
• Stay hands-on: step in with code, design sketches or paired debugging when Staff Engineers or Tech Leads are stuck
• Fine-tune, prompt-engineer and evaluate foundation models (Gemini, GPT, Claude) for accounting-domain tasks such as variance explanation
• Run architecture working sessions, design clinics and 1:1 coaching, and set architecture direction through design reviews and mentorship
• Align architecture decisions across Engineering, Security, Compliance and Data Platform teams, and present proposals and risk assessments to senior leadership
• Set up observability (logging, distributed tracing, metrics, dashboards), own the release strategy, CI/CD pipelines, progressive delivery and automated quality gates, and drive runbooks, incident response and post-incident reviews

Required profile

• Bachelor's or master's degree in computer science or a related field
• 15+ years of software engineering experience with deep distributed-systems knowledge across enterprise platforms
• Proven track record of guiding Staff Engineers and Technical Leads, and of architecting and deploying complex production systems, ideally in regulated industries (FinTech, Financial Services or Healthcare)
• Comfortable at 90%+ hands-on design and implementation; this is a technical leadership role, not a management role
• Proficiency with AI-powered coding assistants (e.g. Claude, Cursor) and strong grounding in observability and production monitoring

Required skills

• .NET, C#, SQL Server and Snowflake
• Preferred: FinTech domain background, Google Vertex AI Agent Builder or similar managed agent platforms, React and Python, experience building and governing AI agents and GenAI systems, DORA metrics and release pipeline instrumentation

Candidates living within a reasonable commute to an office will work in the office at least 3 days a week. BlackLine is an equal opportunity employer.