Staff Software Engineer, Flex
Backend
Financial platform for business
Job no longer available
Financial platform for business
101-200 employees
Job no longer available
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 and server design principles
- An understanding and interest in architectural patterns for highly available, scalable, low-latency, asynchronous systems (for example, well-designed APIs, high volume data pipelines, efficient algorithms)
- Familiarity with software engineering development cycles
- 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
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
- 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
- Collaborate with engineering and product teams to build new features and products
- 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
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 benefits
- Paid medical, dental & vision
- 401k & life insurance
- PTO
- Remote work w/ semi-annual offsites in exotic locations
- Experienced founding team
- Well-funded company with significant horsepower and runway
Company HQ
Financial District, San Francisco, CA
Leadership
Zaid Rahman
(Co-Founder & CEO)Angel Investor with 305 Ventures, and Thiel Fellow of The Thiel Foundation. Former Co-founder and Founding CEO of Volley.
Hadi Solh
(Co-Founder)Partner at Atmos Ventures. Was Board Director at Oxford Ionics, Nethone and ORCA Computing. Former Chief Investment Officer for Depa Group.
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