Senior Software Engineer, Commerce Kajabi is hiring a Senior Software Engineer to join our Commerce team and help shape the future of payments, checkout, subscriptions, and monetization at Kajabi. You’ll work at the intersection of product reliability, financial compliance, and user experience — building scalable systems that power the business side of our creator ecosystem. This role requires strong expertise in Ruby on Rails, React, Postgres, combined with hands-on experience using AI tooling, including agents, to drive smarter workflows and user-facing features. The Impact you will make - Design, build, and maintain scalable backend systems and APIs using Ruby on Rails to power core commerce functionality (checkout flows, invoicing, subscription billing, tax compliance, etc.) - Develop rich, dynamic user interfaces in React that make complex payment processes feel intuitive and delightful. - Integrate AI tooling and agents to streamline product, operational, and development workflows. - Collaborate cross-functionally with Product, Design, and Data to align on user experience and performance goals. - Lead system design conversations, participate in architecture reviews, and contribute to long-term platform direction. - Write clean, testable, maintainable code and provide thoughtful peer reviews. - Support the reliability and security of payment systems — including PCI compliance and fraud mitigation practices. - Champion robust monitoring and observability practices with Datadog. - Provide technical leadership and ownership delivering amazing features to our Heroes. Key Attributes for Success - You’re product- and customer-minded—constantly thinking about how users buy, sell, and manage revenue on Kajabi. With over $1 billion in transactions processed annually through our platform, you understand the impact every interaction has on our creators’ livelihoods and are driven to elevate every touchpoint across the payments experience. - You make pragmatic decisions. You’re not afraid to challenge assumptions, but once aligned, you commit fully to execution and delivery. - You’ve shipped features that impacted key commerce metrics—like conversion, churn, cart value, or failed payment recovery—and have a strong intuition for what drives user trust in financial systems. - You have deep experience working with Stripe’s APIs and can confidently build robust, scalable, and trustworthy commerce experiences. - You balance speed and quality—prioritizing clean architecture, rollback safety, and test coverage in a domain where bugs can have real financial impact. - You use automation, developer tooling, and AI-assisted workflows —like Windsurf, Cursor, Claude Code, and Devin AI— to accelerate delivery without compromising reliability or maintainability. - You’re confident working across the stack—especially in Ruby on Rails, React, and Postgres—and you’re comfortable designing and debugging both backend flows (e.g., subscription billing, tax logic) and customer-facing UIs (e.g., checkout, pricing configuration). - You thrive in a collaborative, cross-functional environment—partnering with Product, QE, Design, and Support to solve real-world commerce problems. You’re not just shipping code, you’re shaping the economic backbone of the Kajabi platform. - You’re comfortable querying production data to validate assumptions, diagnose issues, or advocate for better instrumentation to ensure financial transparency and traceability. - You’re resilient and curious—especially when faced with unexpected behavior in complex systems like payment gateways or tax engines. You push past ambiguity to find root causes and lasting improvements. - You communicate with clarity and intention—whether you're explaining tradeoffs in API design, mentoring a teammate through a PR, or reviewing the rollback plan for a high-impact release. - You design production-ready solutions from day one—whether it’s safe schema changes, idempotent billing flows, or alerting strategies that respect the sensitivity of financial systems. - You help level up the team—offering thoughtful feedback in design reviews, contributing to internal tooling. Bonus if you Have - Familiarity with international payments and currency support. - Contributions to open-source Rails or React projects. - Experience building tools for content creators. - Familiarity with product analytics tools (e.g., Amplitude, Looker, Hex, Rudderstack). - Operational experience deploying on cloud based infrastructure and monitoring via Datadog. Why Kajabi? - Build and support software that makes the world a little bit better by empowering thousands of people to help millions of people get a little bit better at... just about everything: We've built a product that people from all walks of life are using to teach just about anything you can imagine, from personal development, to personal finance and investing, to software development, to yoga, or floral arrangement and everything in between and beyond. Whatever your interests, there are likely at least a few customers who are sharing that kind of knowledge with the world, using Kajabi. If you care about teaching, sharing, and helping others, consider your work at Kajabi a force multiplier that will touch the lives of millions of people. You'll learn a thing or two about what it takes to create, market, and sell digital products. You might even be inspired to make a course of your own—we'd love that! - Work with an incredible group of human beings:"It's the people." That's what everyone seems to say when asked what they like most about working at Kajabi.We spend a major portion of our lives at work, so above all we try to be good humans, to each other and to our customers. - Work within a collaborative and high performing cross-functional product team: We've divided responsibility for our app across several cross-functional teams consisting of about 7 to 10 people including a product designer, QA, UX developer, and a few full-stack or backend developers. Kajabi Team Benefits Package - Competitive full-time salary + bonus - Full medical, dental, and vision (company-paid for you + family) - 401(k) with 6% match - Flexible PTO - Fitness + wellness perks - Mental health resources - Company travel for in office collaboration days, and leadership growth opportunities How We Work Together We let the type of work you do guide the collaboration style. That means we're not always working in an office, but we continue to gather for key moments of collaboration and connection. - For this role, occasional travel to our Newport Beach, CA office is expected for in-person collaboration up to 3 times a quarter. As a result, this role is best suited for candidates in the Pacific Time zone. This role is remote, but we’re also happy to support relocation for exceptional candidates who wish to work from our Newport Beach, CA office. If this is of interest, please let us know when we connect! Pay Range At Kajabi we believe the workplace should be equitable, inclusive, and inspiring for every employee. In an effort to provide greater transparency, we are sharing the base salary range for this position. The position is also eligible for a bonus. Final salary is based on a number of factors including location, travel, relevant prior experience, or particular skills and expertise. US based applicants only. US applicants working virtually - $127,000— $168,000 + bonus US applicants working onsite out of our Newport Beach, CA office - $137,000- $182,000 + bonus How To Apply If you're hungry to do the best work of your career, on a product that actually matters, let's talk. Kajabi LLC is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, gender expression, national origin, disability, age, veteran status, or any other basis protected by applicable law.

• Own the correctness, security, and consistency of authentication and access systems across the platform. • Define and evolve authentication flows, authorization models, and session lifecycle patterns. • Ensure protocol correctness and consistency across protocols (SAML, OAuth 2.0, OpenID Connect, etc.). • Establish and drive adoption of consistent authentication and access patterns across teams, ensuring alignment with defined standards. • Design and validate secure, state-machine-driven authentication workflows. • Standardize handling of MFA, session behavior, and authentication edge cases. • Identify and remediate legacy or inconsistent authentication implementations. • Improve resilience and secure failure handling across authentication flows.

• Contribute to the design and development of cloud infrastructure and data pipelines to support facility operations and analytics • Contribute to cross-functional projects and development efforts to support our AI lifecycle and ML platform.

This description is a summary of our understanding of the job description. Click on 'Apply' button to find out more. Role Description This role will have an immediate impact at a fast-scaling software startup, helping build and adapt systems and processes amid rapid growth. As a senior engineer, you'll enjoy a high degree of autonomy and trust. You will be tasked with developing solutions for complex business problems by collaborating directly with Reunion's clients and our non-technical team members. Your responsibilities will include: - Implementing backend services using AWS technologies. - Developing user-friendly front-end components. - Ensuring the scalability and efficiency of our serverless architecture and Next.js application. - Sharing your expertise with junior team members. - Collaborating with our growing engineering team and helping to develop our engineering culture. If you're passionate about technology and enjoy solving complex problems, we'd love for you to join us on this exciting journey! Qualifications - Bachelor's degree in a technical field (Engineering or Computer Science) or equivalent work experience. - Minimum of 5 years of experience as a Full Stack Engineer. - Proficiency in AWS services, including CloudFormation, Lambda, RDS, Elasticache, Cognito, CloudFront, and S3. - Strong expertise with the Serverless Framework. - Extensive experience with JavaScript, TypeScript, and React. - Experience with infrastructure-as-code, configuration management, and CI/CD pipelines. - Proficiency in Next.js. - Familiarity with Jira (or similar tool) for task management. - Strong problem-solving and communication skills. - Eager to contribute to Reunion’s climate-focused renewable energy mission. - Passionate about collaboration and establishing great relationships with design and product management teams across time zones. - Curious about constantly learning new things and enjoy working collaboratively in a fast-paced startup environment. - Committed to technical excellence, maintaining a high level of code quality & consistency, and passionate about shipping code quickly. - Excellent oral and written communicator. Requirements - Experience with developing products in the renewable energy or real estate spaces. - Experience working on online marketplace or auction mechanisms. - Experience with Turborepo. - Experience with large-scale data engineering. - Experience building data pipelines or web scraping. - Interest in AI agent frameworks. - Experience in building & architecting a software product from scratch. Benefits - 100% medical, dental & vision insurance coverage for you + partially covered for your dependents. - Unlimited PTO. - WFH stipend to support your home office needs. - Competitive Salary. - Stock Options. Company Description Reunion is the leading platform for clean energy tax credits and compliance. Since 2024, we have worked with major corporations to invest over $7 billion in clean energy projects, including some of the industry's largest tax credit transactions. We are a fast-growing and profitable company, and our expert 20-person team knows how to get things done and loves to move fast! Our founders, Billy Lee and Andy Moon, are second-time entrepreneurs and were early pioneers in solar tax equity and project finance. We have recruited an experienced team of early executives from SunEdison, SolarCity, Tesla, GoodLeap, and other leading clean energy companies. We have built a strong company culture which values collaboration and speed… while still having fun. In 2025, we launched Reunion PWA, a software solution that helps developers comply with prevailing wage and apprenticeship (PWA) requirements to unlock the full value of clean energy tax credits. Reunion PWA is rapidly gaining traction in the market, and we’re growing our team to accelerate adoption and expand to additional compliance offerings. Join us in the fight against climate change by helping renewable energy developers build faster!