Senior Software Engineer, Kit (Formerly ConvertKit)

• You're a full-stack, product-minded engineer with strong expertise in Ruby on Rails and React who thinks beyond individual features to understand system impact
• You see our developer platform not as a technical requirement but as the foundation that empowers thousands of creators to extend Kit in ways we haven't imagined
• You demonstrate ownership by proactively identifying and solving problems, partnering closely with Product and Design to deliver the right solutions
• You thrive in ambiguity, bring ideas to life without waiting for perfect conditions, and contribute to a culture of transparency and continuous learning
• Most importantly, you understand that great developer experiences create compounding value: when we make it easier for others to build on Kit, we accelerate the entire creator ecosystem
• Skills:
• Develop full-stack web applications using Ruby on Rails and React with strong technical proficiency
• Write high-quality, well-tested, performant, and accessible code with minimal guidance
• Drive product outcomes by understanding how features contribute to creator success and finding simpler solutions
• Communicate clearly across Engineering, Product, and Design to maintain alignment and momentum
• Debug complex issues effectively across multiple domains
• Experiences:
• Planned, estimated, and executed complex projects independently while proactively communicating with stakeholders
• Modernized and improved existing systems through hands-on brown-field development
• Made data-driven decisions throughout the product development lifecycle
• Worked transparently by sharing progress, learnings, and seeking feedback early and often
• Delivered features that directly impacted customer success and business goals
• Traits
• Demonstrate growth mindset through continuous learning and rapid skill development
• Adapt flexibly to dynamic environments while maintaining proactive ownership of outcomes
• Create momentum by bringing ideas to life without waiting for perfect conditions
• Strong interest in AI and eagerness to experiment with the evolving landscape to make our work more efficient and effective
• Integrate feedback naturally into workflow, both giving actionable input and iterating based on feedback received
• Shape and champion solutions that deeply align with user needs, balancing technical excellence with product impact

Desirable

• We're looking for a Senior Software Engineer to help build our extensibility and automation platform that powers how creators customize Kit to their unique needs
• You'll be joining the Ecosystem team, which owns the Kit App Store, developer platform (APIs, plugins, webhooks, OAuth), and automation suite that enables creators to build sophisticated, automated marketing systems
• We're a newly forming team tackling both legacy modernization and greenfield opportunities, so your enthusiasm for collaborative problem-solving and transforming brown-field systems into elegant solutions is essential
• You'll report to the Engineering Manager who leads the Ecosystem team, a cross-functional product team at Kit. You'll collaborate closely with a Product Manager, Product Designer, and peer Software Engineers
• You’ll also have access to a group of Engineers across Kit for support and mentorship, and will start with a peer onboarding buddy who will help you navigate our systems and codebase
• First Week: Dive into our codebase and extensibility and automation architecture. Set up your local environment and merge your first production code. Take part in Get To Know You's to meet our distributed team
• First Month: Work through your personal onboarding plan. Begin understanding how Kit App Store supports creators from small to large, and identify opportunities for improvement. Join team activities for planning, building, and measuring the experiences we ship to creators. Actively participate in code reviews, and contribute PRs weekly
• First Six Months: Lead and architect at least one significant feature from idea to launch. Transform our legacy codebase through strategic refactoring while applying systems thinking to enhance scalability and maintainability. Drive adoption of patterns and conventions that elevate team-wide technical standards. Ensure service reliability by participating in on-call rotations. Present at least one Lunch & Learn session. Actively mentor peers, and champion quality across our codebase
• We work mostly on East Coast time—so if you're based on the West Cost of the United States, Europe, or Asia, you might have a few early mornings or late evenings

• Deadline to Apply: October 31, 2025 at 4:00 AM UT
• We usually receive a large number of applications, and our goal is to follow up with you within two weeks. You’ll hear from us either way. Here’s what you can expect from the rest of our hiring process:
• A phone screen with our recruiter
• Hiring manager interview
• Work sample
• A technical interview
• Technical execution and leadership interview
• We’ll keep you informed through every step. To get started, complete this application, including a cover letter and answers to the questions on the next page
• We read every single application, and your cover letter and responses help put your experience into context