Senior Fullstack Engineer - AI
About SignNow team:
We are a passionate and ambitious team of 100+ people on a mission to succeed with our award-winning signature solution - SignNow.
SignNow empowers over 28 million people at companies across the world to move fast with everything they need to send and eSign their documents. Increase productivity with document workflows, impress customers, and save money while maximizing ROI with SignNow.
What you will be working on:
Delivering product features with AI coding agents as your primary implementation loop: writing specs and context-rich tasks that carry architecture, team standards, existing patterns, and acceptance criteria, then iterating until the output meets the bar
Reviewing and verifying agent-generated code with the same rigor you would apply to a colleague's, catching the plausible-but-wrong before it reaches production
Taking full ownership of every feature end-to-end: clarifying requirements, understanding the problem, owning the quality and test coverage of what you ship, delivering to production, then monitoring behavior, performance, and regressions post-release
Improving how the team works with agents: the shared context, rules, prompts, and guardrails that make everyone's agent output better, not just yours
Conducting code and documentation reviews to ensure quality, share knowledge, and maintain consistency across the codebase
Participating in duty rotations: monitoring production systems, responding to incidents, keeping services available
Growing technically inside a team with a strong engineering culture, clean architecture, and a high bar for delivery
What we expect from you:
5+ years of commercial software engineering experience
Hands-on experience building production software with AI coding agents (Claude Code, Cursor, Codex or similar), including how you set up context, decompose work for an agent, and validate what comes back. Be ready to describe outcomes, not tool names
Practical commercial experience with PHP, Node.js or Golang
Hands-on experience with JavaScript, TypeScript, and React
Solid SQL and experience with relational databases (MySQL, PostgreSQL, or similar)
Working knowledge of Docker for application development and deployment
Practical experience with testing methodologies, and an opinion on what "sufficient coverage" means
At least basic knowledge of DevOps, CI/CD, AWS, and cloud-native solutions
Ability to write technical documentation using approaches like the C4 model and ADRs
Strong task decomposition and prioritization skills
Fluent English, written and spoken