Senior Software Engineer

About the role

The Senior Software Engineer will design solutions and deliver complex features across Billtrust’s product platforms, leveraging AI tools for end‑to‑end development and mentoring peers.

Key responsibilities

• Own end‑to‑end specification quality for complex features, ensuring comprehensive, unambiguous specs.
• Lead AI‑assisted implementation using tools like Claude Code, reviewing generated code for security, performance and architectural alignment.
• Design performant, scalable SaaS software, develop REST APIs, and support UI and backend services.
• Mentor engineers on AI tool usage, spec writing, and code review, sharing knowledge across cohorts.

Required profile

• 5+ years of software engineering experience designing scalable SaaS solutions.
• Bachelor’s degree in Computer Science or equivalent experience.
• Strong ability to write code in C#, C++, PHP, Java, Node.js or similar languages.
• Experience with HTML5, CSS/Sass, Angular, React, TypeScript/JavaScript and REST API design.
• Proficiency with SQL Server or MySQL and source control (Git).

Required skills

• C#
• C++
• PHP
• Java
• Node.js
• HTML5
• CSS/Sass
• Angular
• React
• TypeScript/JavaScript
• REST APIs
• SQL Server / MySQL
• AI coding assistants (Claude Code, Codex, Cursor, etc.)
• Git

What we offer

• Comprehensive health coverage
• Competitive retirement plan
• Generous PTO and parental leave
• Flexible work options (remote)
• Professional development investment