Senior Software Engineer, Flex
Backend
$150-220k
AI-native private banking for business owners
Open for applications
AI-native private banking for business owners
101-200 employees
Open for applications
$150-220k
101-200 employees
Company mission
To reimagine every single aspect of the financial workflow and financial services for any entrepreneur.
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
- We are looking for engineers who are excited to be part of our early story and help us build a diverse and vibrant company
- As a senior software engineer you will have the opportunity to work across the entire stack with a focus on the back-end
- You will have the opportunity to learn and drive the creation of financial products and experiences to help our customers reach their full potential
- You should have a strong sense of ownership and enjoy taking projects from inception to release
- As an early employee, you’ll be working with a nimble team of committed and talented engineers and having a large, long-term impact on technical design and engineering culture
- 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.
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