jobapplier

Senior Fullstack Engineer (User Retention & App Ecosystem)

Kikoff

Skills

Required

  • observability
  • React
  • Flutter
  • ideation
  • fullstack development
  • backend
  • web frontend
  • mobile
  • AI
  • Ruby
  • Rails
  • MySQL

Preferred

  • credit report retrieval
  • credit disputes
  • cross-app integration

Join Kikoff, a leading fintech company, as a Senior Fullstack Engineer. In this role, you will focus on user retention and app ecosystem integration, driving user-facing projects and improving existing core services. You will be the technical owner for 1 to 2 large product areas and enhance observability, reliability, and operational excellence across existing services. The position offers a range of benefits, including health benefits, flexible PTO, and 401k matching.

Lead and implement data-driven and impact-focused projects around user-retention and ecosystem integration end-to-end, affecting millions of users.

Responsibilities

  • 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.

Requirements

  • 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)
  • 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!

Preferred

  • Background in fintech, payments, or lending infrastructure

Pay

USD 244,000 - 292,000