Senior Software Engineer; FinTech

About Differential

Differential is growing! Yep, it turns out customers like us :) Our team of designers, developers, jokesters, and all around good folk needs more firepower. We’re proudly headquartered in Cincinnati, OH, but our team spans across the country.

In addition to only choosing the best group of people to work around, we are also very picky about the types of customers we’ll work with. In line with our mission to make technology that moves people towards one another, we partner with forward-thinking pioneers and innovators to revolutionize their organizations from the inside out and bring great digital products to life, with a focus on the platform that connects people with their local church everyday.

Throughout our history we’ve built a diverse range of products like transforming retail with Adidas, helping Lexmark innovate cross-industry, streamlining the sales process with Big Ass Fans, to multi-platform mobile apps for large audiences with Crossroads Church. Our Company’s focus is now on building the Apollos platform that connects people with their local church everyday.

We hire great, trustworthy people so that we can optimize for a free & flexible culture: flexible vacation, remote work, and working on meaningful stuff you’re excited about.

We’re looking for a Lead Engineer (Fin Tech) to join our engineering team as a highly hands‑on individual contributor. This is not a people‑management role — you’ll be one of the senior technical engineers on the team, owning complex engineering problems and helping shape the architecture and technical direction of our Fin Tech products.

You’ll work deeply across payments, financial integrations, APIs, data, and distributed systems while partnering closely with Product and Engineering leadership to build reliable, secure, scalable software. Many large organizations and millions of dollars rely on applying sound engineering principles to our products' rapid development.

This role is for you if:

• You’re someone who loves hardcore software engineering.
• You have developed the technical judgment and validation techniques to tackle problems that don’t have obvious answers.
• You can take an ambiguous problem, understand the business and technical constraints, design a solution, and then build it yourself.
• You care about building things correctly, but you also understand that “perfect" is the enemy of “shipped”.
• You’re comfortable in a fast-moving environment where you’ll have significant ownership and a real opportunity to shape the product and technology.
• You lead through technical expertise, ownership, judgment, and influence.

Above all, we are focused on finding someone that we love to work with. Culture to us isn’t a ping pong table in the breakroom or some words we put up on the wall. It’s embedded in our DNA and starts with our hiring process. We want to consider passionate people for this position.

Our mission statement, core values, benefits, and more can be found at

• Own the technical design and implementation of complex Fin Tech and payment‑related systems.
• Make architectural decisions and help establish engineering standards and patterns.
• Build and maintain APIs, integrations, services, and data systems.
• Work hands‑on in the codebase — designing, coding, reviewing, debugging, and shipping.
• Solve challenging problems involving payments, financial data, transactions, reconciliation, and third‑party integrations.
• Partner closely with Product and Engineering leadership to translate business requirements into strong technical solutions.
• Identify technical risks and proactively improve system reliability, scalability, security, and performance.
• Mentor and influence other engineers through code reviews, technical guidance, and strong engineering practices.
• Help the team move quickly without sacrificing quality or long‑term maintainability.
• Passion for the whole product process: we know you will have your specific areas of focus, but we find that people who are passionate about the bigger picture collaborate best on our cross‑functional teams.
• Demonstrated ability to rely on an iterative process to maintain momentum on…