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Senior Software Engineer, Backend

Flex· Engineering
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Hybrid (Remote)$150k - $220k + equityFull-timePosted 11mo ago

About the role

Senior software engineer focusing on backend, with ownership over large domains and features related to card processing/issuing and core ledgering of financial transactions. Early employee role with opportunity to influence technical design, architecture, and engineering culture, across the full stack with emphasis on backend systems for an AI-native private bank for business owners.

Responsibilities

  • Ownership over large domains and features related to card processing/issuing, and core ledgering of financial transactions
  • Play a critical role in the development, design, and maintenance of Flex's platform and services.
  • Architect well thought-out services and data models that ensure Flex's continued growth
  • Own problems end-to-end, thinking through everything from api contracts, data, scalability, security, observability, and metrics.
  • Lead by example and mentor engineers in all aspects of planning, development and testing.
  • Be a catalyst for driving best-in-class technology frameworks and tooling while staying engaged with the latest technology trends.
  • Be on call, with the expectation to ability to solve problems and find solutions for the servicing team

Qualifications

  • Proficiency in NodeJS+Typescript and server design principles.
  • An understanding and interest in architectural patterns for highly available, scalable, low-latency, asynchronous systems
  • Ability to hold yourself and the team to high standards.
  • Strong communication (written and verbal) and interpersonal skills.
  • Ability to provide in-depth evaluation of multiple technical directions and determine tradeoffs of each.
  • Strong propensity to make data-driven decisions on technical architecture and project prioritization.
  • Exposure to modular monoliths and micro-services along with the benefits and challenges they bring.
  • Experience with any cloud based provider like Google Cloud, AWS, or Azure.
  • Four or more years of relevant industry experience with a track record of shipping high-quality products and features at scale.
  • A strong work ethic and are ready to grind
  • Have built and shipped a working project or product, ideally something complex

Skills

Required:Node.jsTypeScriptArchitectural patterns for scalable systemsCloud platforms

Benefits

  • Medical, dental and vision insurance
  • Paid time off
  • 401(k) plan
Last updated Oct 21, 2026. Interested? Apply on the company site.

About Flex

All-in-One Business & Personal Finance Platform

Flex is the all-in-one business & personal finance platform for owners. Access premium business banking, flexible net-60 credit, and AP automation. All for free.

Business BankingBusiness CreditNet-60 Credit TermsRewards & CashbackEmployee Expense ManagementAP AutomationGlobal PaymentsCredit Card
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