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Senior Software Engineer, Backend

Flex· Engineering
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Hybrid (Remote)$55k - $100kFull-timePosted 11mo ago

About the role

Senior software engineer role focusing on back-end development with ownership over large domains like card processing/issuing and core ledgering of financial transactions. Early-stage role with impact on technical design, architecture, and culture at Flex.

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:NodeJSTypescriptServer design principlesArchitectural patterns for highly available, scalable, low-latency systemsCloud platforms
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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