Senior Software Engineer, Backend

🕒 August 30, 2025

🌐 Brazil, Canada, +2 more countries – Remote

🇧🇷 Brazil – Remote 🇨🇦 Canada – Remote 🇺🇸 United States – Remote 🇨🇴 Colombia – Remote

💵 $45k - $100k / year

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

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Flex

WebsiteLinkedInAll Job Openings

11 - 50 employees

💳 Fintech

🤝 B2B

💰 $100M Debt Financing on 2023-09

Fintech • B2B

Flex is an end-to-end finance platform designed for businesses, facilitating various financial operations and enhancing financial management. With a focus on providing comprehensive financial solutions, Flex aims to streamline processes and improve efficiency for its users in the commercial sector.

📋 Description

• Flex is building a finance super app for premium business owners — reimagining every single aspect of the financial workflow and financial services for any entrepreneur. The company has grown revenue 25x+ since publicly launching in September 2023 and is on track to achieve profitability by late 2025. Flex is focused on mid-market businesses ($3 - $100M revenue) that are largely overlooked by existing fintech solutions and reliant on slow and outdated regional banks. We are targeting a ~$1T revenue opportunity that is largely up for grabs. • Flex is a fully remote company and this role can be performed from anywhere. • The Role • 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. • We are open to candidates from Canada, the United States, and Colombia.

🎯 Requirements

• 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