Senior Fullstack Engineer (User Retention & App Ecosystem)

• The User Retention and App Ecosystem team focuses on sustainable, long-term, and interconnected customer growth at Kikoff
• We help customers stay around longer and get more value from their subscriptions
• We ensure that customers are excited to explore the different consumer fintech apps across Kikoff’s growing ecosystem, with as little cross-app friction as possible
• We’re looking for a Senior Fullstack Engineer to drive user-facing projects, improve existing core services, and own product domains
• Lead and implement data-driven and impact-focused projects around user-retention and ecosystem integration end-to-end, affecting millions of users
• Be the definitive technical owner for 1 to 2 large product areas across credit report retrieval, credit disputes, customer off-boarding experience, and cross-app integration
• Enhance observability, reliability, and operational excellence across existing services

Benefits

• Health Benefits
• Flexible PTO Policy
• Kickoff Paid Holidays
• Office Lunch & Dinners
• Commuter Benefits
• Commuter Flexible Savings
• 401k Matching
• Fitness Benefit Policy- 6+ years of industry experience, or high-slope growth, with demonstrated breadth and depth of product impact
• Strong fullstack development experience with a backend focus: proficient or highly proficient on the backend, and experienced in either web frontend (React) or mobile (Flutter preferred)
• B.A. / B.S. / M.S. or strong self-taught fundamentals in computer science
• Strong system design skills for both new and existing systems
• Good judgment in identifying and choosing trade-offs between business impact, delivery speed, and long-term operational excellence
• Strong cross-functional communication and coworking skills with product, data, design, and legal partners
• Demonstrated ability to own and drive complex projects end-to-end, coordinating focused teams through ideation, requirements, design, implementation, launch, and post-launch
• Experience with financial infrastructure or regulated environments (credit bureau data, PII, SOC2)
• Background in fintech, payments, or lending infrastructure
• Experience integrating third-party APIs reliably and communicating with technical vendors
• Experience with classical ML model training and production deployment
• Experience with using business metric focused A/B tests and experiments for new features
• Experience in leveling up the team through code reviews, design docs, and technical guidance
• Thoughtful use of AI tools to accelerate delivery while maintaining operational excellence
• Eagerness for product and feature ideation
• Experience with our stack is a plus: Ruby on Rails, React, Flutter, MySQL
• Experience with observability, monitoring, and alarms in customer-facing systems
• If you like owning both the work and the outcome of a complex project end-to-end, we’d like to talk to you!