Lead Software Engineer

About the role

Billtrust is seeking a Lead Software Engineer to provide technical leadership for a domain‑aligned cohort building AI‑assisted, scalable SaaS products. You will work closely with engineering managers, product managers and stakeholders to translate business needs into high‑quality specifications and deliver complex features end‑to‑end.

Key responsibilities

• Guide engineers in spec‑driven, AI‑assisted development and own specification quality for complex features.
• Lead AI‑generated implementation, review code for security, performance and architectural alignment, and drive AI workflow standards across the cohort.
• Design and implement REST APIs, create scalable software designs, and mentor engineers on AI tool usage and best practices.

Required profile

• 7+ years of software engineering experience with at least 2 years designing enterprise SaaS systems.
• Strong collaboration and communication skills, proven mentorship experience, and ability to translate business requirements into technical specifications.

Required skills

• C#, C++, PHP, Java, Node.js
• HTML5, CSS/Sass, Angular, React, TypeScript/JavaScript
• SQL, SQL Server, MySQL, NoSQL, Git
• AWS, Azure
• Experience with AI coding assistants such as Claude Code, Codex, or similar.

What we offer

• Competitive base salary $157,000‑$208,000 annually, with potential equity or performance bonuses.
• Comprehensive health coverage, retirement plans, generous PTO and parental leave, flexible remote work, and professional development support.