Senior Software Engineer, Flex

Backend

Salary not provided

AWS

TypeScript

Node.js

Azure

Mid and Senior level

Remote from Canada, US

AI-native private banking for business owners

Job no longer available

AI-native private banking for business owners

101-200 employees

FintechB2BBankingPaymentsCredit cardsSaaSMobile

Job no longer available

Salary not provided

AWS

TypeScript

Node.js

Azure

Mid and Senior level

Remote from Canada, US

101-200 employees

FintechB2BBankingPaymentsCredit cardsSaaSMobile

Company mission

To reimagine every single aspect of the financial workflow and financial services for any entrepreneur.

Job

Company

Role

Who you are

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

What the job involves

As a senior software engineer you will have the opportunity to work across the entire stack with a focus on the back-end
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

Our take

Flex, formerly known as Flexbase, supplies credit and finance management tools for small and midsize business (SMBs). At the core of its offering is a credit card, with a complimentary platform that collects all finance operations into one easy-to-manage app.

Perhaps the most intriguing part of Flex's approach is the credit card itself, which comes with 0% interest for 60 days. Through this, businesses can enhance their cash flow and be more flexible in investing in growth. Besides this, users can also issue virtual employee cards at no extra cost, and use functions such as receipt capture and free ach/wire payments.

Having steadily grown its offering over the years, Flex has raised significant funding to expand its business and accelerate growth. Demand for its solutions has expanded beyond its initial focus on the construction industry to target clients across logistics, e-commerce, real estate and other sectors. After raising $85 million over two rounds in 2025, Flex has launched a Google Pay partnership and the Visa Infinite Business Credit Card, with enhanced benefits for business owners.

Steph

Company Specialist at Welcome to the Jungle

Company

Funding (last 2 of 6 rounds)

Dec 2025

$60m

SERIES B

Mar 2025

$25m

EARLY VC

Total funding: $123.2m

Company HQ

Financial District, San Francisco, CA

Leadership

Zaid Rahman

(Co-Founder & CEO)

Angel Investor with Valyrian, and Thiel Fellow of The Thiel Foundation. Former Co-founder and Founding CEO of Volley.

Hadi Solh

(Co-Founder)

Founder & Partner at Atmos Ventures. Previously a Board Director at Oxford Ionics, Nethone and ORCA Computing. Former Chief Investment Officer for Depa Group.

Share this job

View 20 more jobs at Flex