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Backend Engineer, Fintech

About OnePay

OnePay is a consumer financial services app with an exceedingly simple mission: to help people achieve financial progress.

Tens of millions of Americans today are unbanked or underbanked, meaning they don’t have enough money in savings to cover a minor emergency. They pay too much in fees, don’t have access to credit at affordable rates, and have little ability to grow their wealth. OnePay’s vision is to create a single app for consumers to save, spend, borrow, and grow their money, bringing our mission to life with simple and accessible banking, credit, and payments products that deliver a best-in-class experience to millions of customers. Our products include:

  • Checking and high-yield savings accounts

  • Domestic and international peer-to-peer payments

  • Credit Builder and credit score monitoring

  • Digital wallet / contactless payment solutions

  • Buy-now-pay-later installment loans at Walmart

Why do we have a right to win? We have the backing of Walmart (a Fortune 1) and Ribbit Capital (a preeminent fintech investor), are deeply embedded with the distribution of the world’s largest omnichannel retailer, and have an industry-leading multi-product value proposition — all in addition to having some of the best people and talent in the industry.

There’s never been a better time to build a category-defining business and there has rarely been a team better positioned for the opportunity. Join us!

The role

Software Engineers at OnePay build the products & systems that serve our customers and run our company. Besides writing, reviewing, and shipping code, engineers collaborate with others across the company, from product, design, and data to, customer support, ops, and compliance. Software Engineers at OnePay are highly technical, communicative, and emotionally intelligent.

  • Architect, design, and implement software applications for consumer products

  • Develop features from the ground up ( 0->1 )

  • Write robust documentation. As a growing and remote organization, having the necessary docs are key to our success. 

  • Build and maintain vendor integrations.

  • Solve complex, real-world problems involving large-scale money movement and sensitive financial data.

You bring

  • 3-7 years of experience

  • Bachelor's degree, Computer Science preferred 

  • Experience working in a high-scale banking or fintech organization

  • Professional experience building, shipping — and growing customer-facing products

  • Knowledge of banking protocols, API’s, and security standards

  • Deep understanding of event-driven architecture and microservices

  • Solid understanding of banking systems, financial transactions, and payment processing

  • Experience leading, mentoring, and demonstrating excellence in execution. You need little oversight when given a problem to solve, and you have a track record of getting things done.

  • Passion for your craft and care for the people you work with. You value quality across code, communication, and culture.

  • A desire to keep growing your skills, and an ability to learn quickly. We hope you’ll be here for a while, and there’s no better investment than in our people.

  • The Triple H Factor: Hungry, Humble, Honest

Tools we use

We use the fp-ts library for functional programming with Node/TypeScript running on top of Kubernetes and AWS. We believe great engineers can learn any stack, so you do not need experience with these specific tools, but you’ll ramp up more quickly if you are familiar with functional programming concepts.

What We Offer

  • Competitive base salary, stock options, and health benefits from Day 1

  • 401(k) plan with company match

  • Remote-friendly (US), flexible time off (FTO), and opportunities for growth

  • A high-growth, mission-driven, inclusive culture where your work has real impact

Pay Transparency

The estimated annual base salary for this position ranges from $130,000 to $170,000.  Pay is generally based upon the level, complexity, responsibility, location and job duties/requirements of the specific position. We then source candidates with the requisite skills, expertise, education, training, and experience.  If you are selected for an interview, please feel welcome to speak to a Talent Partner about our compensation philosophy and other available benefits.


We use Covey as part of our hiring process for jobs in NYC and certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on May 31, 2024.

Please see the independent bias audit report covering our use of Covey here.

Standard Interview Process

  • Initial Interview with Talent Partner

  • Technical or Hiring Manager Interview

  • Team Interview

  • Executive Interview

  • Offer!

Equal Employment Opportunity

To build technology and products that are used and loved by people and solve real-world problems, we need to build a team with many different perspectives and experiences. We are an equal opportunity employer. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. We encourage candidates from all backgrounds to apply. Applicants in need of special assistance or accommodation during the interview process or in accessing our website may contact us at talent@onepay.com.

Average salary estimate

$150000 / YEARLY (est.)
min
max
$130000K
$170000K

If an employer mentions a salary or salary range on their job, we display it as an "Employer Estimate". If a job has no salary data, Rise displays an estimate if available.

What You Should Know About Backend Engineer, Fintech, OnePay

At OnePay, we're on a mission to revolutionize the financial lives of everyday Americans, and we're looking for a talented Backend Engineer to join our dynamic team. As a key player at OnePay, you will architect, design, and implement innovative software applications that bring our vision of accessible financial services to life. Imagine building features from the ground up for products that help people save, spend, borrow, and grow their money effectively. You'll work closely with cross-functional teams, including product designers, data analysts, and customer support, to develop robust solutions that ensure seamless banking transactions and positive user experiences. With a focus on documentation, you’ll ensure our projects are not just built but understood and maintained for future growth. The successful Backend Engineer at OnePay will bring 3-7 years of experience in a high-scale banking or fintech organization, showcasing a deep understanding of banking protocols and event-driven architecture. You’ll have the opportunity to lead and mentor other engineers, tackle complex problems involving sensitive financial data, and thrive in a culture that values humility, honesty, and hunger for excellence. If you’re passionate about your craft and eager to grow with us, then OnePay is the perfect place for you to make a real impact while enjoying a competitive salary, flexible time off, and stock options. Come be part of something bigger than yourself!

Frequently Asked Questions (FAQs) for Backend Engineer, Fintech Role at OnePay
What are the main responsibilities of a Backend Engineer at OnePay?

As a Backend Engineer at OnePay, you will play a critical role in architecting and implementing software applications that drive our financial services. Your responsibilities will include developing features from inception to deployment, maintaining documentation for clarity and continuity, and ensuring seamless integrations with vendors. You will also work on solving complex issues related to large-scale financial transactions while closely collaborating with various teams within the company.

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What qualifications do I need to become a Backend Engineer at OnePay?

To be considered for the Backend Engineer position at OnePay, candidates should possess 3-7 years of relevant experience, ideally in a fintech or banking environment. A Bachelor's degree in Computer Science is preferred. You should be well-versed in banking protocols, APIs, event-driven architecture, and possess a solid understanding of financial transactions and payment processing. Excellent communication skills and the ability to work collaboratively in a remote setting are also essential.

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What tools and technologies will I be using as a Backend Engineer at OnePay?

At OnePay, our Backend Engineers primarily work with Node.js, TypeScript, and the fp-ts library for functional programming, deploying applications on Kubernetes and AWS. While familiarity with these tools is helpful, we believe talented engineers can excel with any stack, provided they are eager to learn and adapt to new technologies.

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What does the interview process look like for the Backend Engineer position at OnePay?

The interview process for a Backend Engineer at OnePay involves several stages. It starts with an initial interview with a Talent Partner, followed by a technical assessment or interview with the hiring manager. Candidates will then participate in a team interview to assess collaboration skills before meeting with executives. Finally, successful candidates will receive an offer based on their qualifications and fit within the team.

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What is the salary range for a Backend Engineer at OnePay?

At OnePay, the estimated annual base salary for a Backend Engineer ranges from $130,000 to $170,000. The final compensation is determined based on various factors, including the level of experience, job complexity, and individual qualifications. During the interview process, candidates are encouraged to discuss compensation packages with a Talent Partner.

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Common Interview Questions for Backend Engineer, Fintech
Can you describe your experience with event-driven architecture as a Backend Engineer?

When answering this question, focus on specific projects where you utilized event-driven architecture. Discuss how it helped improve system scalability or performance. Highlight your understanding of asynchronous processing and how you managed events within a distributed system.

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How do you ensure code quality when developing backend applications?

To ensure code quality, I follow best practices such as code reviews, writing automated tests, and using continuous integration tools. I prioritize clean and maintainable code, documenting key components and their functionality while seeking feedback regularly from colleagues.

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What is your experience with APIs and how have you integrated them in previous projects?

When discussing API integration, highlight specific examples where you've developed or consumed APIs. Explain the protocols you used, any challenges you faced, and how you ensured secure and efficient communication between services.

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Can you describe a challenging problem you solved in your previous backend role?

Choose a specific example that demonstrates your problem-solving skills. Share the context, the obstacles you encountered, and the steps you took to arrive at a solution, emphasizing the impact of your work on project outcomes.

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How would you approach mentoring a junior developer?

In mentoring a junior developer, I would start by understanding their current skill level and goals. I would provide guidance on technical challenges, encourage their growth through code reviews, and offer resources. Regular check-ins and fostering an open environment for questions would also be key.

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What steps do you take to stay updated on the latest developments in backend technologies?

I stay updated by following tech blogs, participating in online forums, and attending webinars or conferences. Engaging with the developer community and experimenting with new tools or frameworks in personal projects also keeps my skills current.

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Explain how you handle tight deadlines while ensuring quality work?

During tight deadlines, I prioritize tasks based on urgency and impact. I communicate closely with my team to align on expectations and possible trade-offs while maintaining focus on delivering high-quality work. Regular check-ins help manage risks and ensure we stay on track.

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How do you approach testing and debugging your backend applications?

I adopt a test-driven development approach, writing tests initially to guide my coding. During debugging, I use tools like logging and debugging frameworks to trace issues. I also analyze performance metrics to optimize application efficiency.

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What strategies do you use for database optimization in backend systems?

For database optimization, I ensure proper indexing is in place and optimize queries for performance. I also monitor database performance metrics and evaluate whether read/write patterns need to be adjusted based on application demands.

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How do you ensure secure handling of sensitive financial data in your applications?

In handling sensitive financial data, I implement encryption for data at rest and in transit. I stay informed about compliance regulations and best practices, such as OAuth for secure authentication, to protect user information effectively.

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DATE POSTED
March 22, 2025

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