Source Job

US

  • Design, implement, and maintain high-volume payment processing and fund distribution systems.
  • Collaborate with Finance, Compliance, and Product teams to meet regulatory and reporting requirements.
  • Drive process improvements in CI/CD, monitoring, and observability for financial workflows.

C# ASP.NET SQL Server

20 jobs similar to Senior Software Engineer, Payments/Fintech

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US Unlimited PTO

  • Architect and implement scalable, performant, and secure software solutions for backend distributed platforms.
  • Provide technical leadership, write clean code, and conduct code reviews to ensure best practices.
  • Collaborate cross-functionally with product managers, designers, and engineers to translate business requirements into technical specifications.

Dave is a financial app that builds products to level the financial playing field for Americans who are financially vulnerable or living paycheck to paycheck. As a public fintech company, it offers a digital financial platform with products like ExtraCash and is focused on creating accessible credit options.

US

  • Lead the architectural design and hands-on development of our global fiat payment rails.
  • Architect, implement, and scale seamless API integrations into our banking partners' systems.
  • Develop robust internal operational tooling to support reconciliation, automated alerts, financial operations, and compliance reporting.

Zerohash is the leading crypto and stablecoin infrastructure platform and the operating system for digital money, powering the next generation of financial services. Founded in 2017, zerohash enables banks, brokerages, fintechs, and payment companies to offer crypto trading and is trusted by some of the world’s most recognized financial and consumer brands.

UK 5w PTO

  • Design, develop, and maintain secure, scalable, and high-quality SDKs and backend services for payment device integrations.
  • Lead architectural and design discussions across backend and mobile platforms while mentoring junior and mid-level engineers.
  • Collaborate closely with Product, QA, and Operations to ensure successful feature delivery and participate in CI/CD pipeline evolution.

NMI is a leading provider of payment gateway solutions, specializing in card-present solutions and payment processing. The company fosters a remote-first culture with a focus on reliability, security, and innovation, offering a strong commitment to employee wellbeing.

US 6w PTO

  • Work as a member of Agile project teams to define, estimate, and complete agreed tasks to timelines.
  • Develop and maintain software, databases, and applications, including writing effective RESTful APIs and troubleshooting complex code bases.
  • Test software to ensure integrity, accuracy, responsiveness, and performance, and create unit tests according to company procedures.

Trupanion is a leading provider of medical insurance for cats and dogs in North America. They offer a collaborative, casual, and pet-friendly environment where everyone is encouraged to be themselves.

UK 5w PTO

  • Shape the technical direction of Masabi's payments platform, contributing to architecture, standards, and engineering best practices.
  • Design and deliver scalable, secure, and resilient payment solutions, supporting teams in building microservices-based architectures.
  • Act as a senior technical advisor, guiding complex decisions and collaborating with external payment partners.

Masabi drives the fare payment revolution, building fare collection platforms that allow riders to buy and present tickets for public transport via mobile, ticket machines, or bank cards. Their Justride platform is used in over 250 locations globally, and they foster a collaborative, innovative culture with a network of passionate individuals.

US

  • Lead the design of a double-entry, multi-partner sub-ledger architecture.
  • Design the integration layer that lets the company add or swap partners without rewriting product code.
  • Design how OFAC screening, BSA/AML signals, and in-house fraud models run inline on every money movement decision.

CertifID provides a secure platform that verifies identities, authenticates wire transfer instructions, and detects fraud attempts in real estate transactions. They have been recognized as one of the Best Startups to Work for in Austin and prioritize a dynamic work environment.

$214,000–$300,000/yr
US

  • Serve as a Technical Lead across multiple teams - setting architectural direction, unblocking engineers, and ensuring high-quality delivery aligned with long-term goals.
  • Define the north-star architectural vision for the Money Group and continuously identify shorter-term projects that move us toward it.
  • Architect the convergence of Gusto's People Stack (payroll, HR, benefits) and Finance Stack (banking, accounting, payments, lending) into a unified platform for small businesses.

Gusto's mission is to grow the small business economy. They handle payroll, health insurance, 401(k)s, and HR, so owners can focus on their craft and their customers. With teams in Denver, San Francisco, and New York, they support more than 500,000 small businesses nationwide.

Europe 6w PTO

  • Support merchants during integration with Noda’s payment solutions.
  • Investigate complex technical and payment-related issues using logs, monitoring tools, and internal systems.
  • Diagnose incidents, identify root causes, and coordinate resolutions with internal teams.

Social Discovery Group (SDG) unites millions of users on dozens of social discovery products, solving loneliness and disconnection by transforming virtual intimacy. Their international team of 1000+ professionals and digital nomads works all over the world.

Latin America

  • Design, develop, and maintain cloud-native SaaS applications using React, C#, .NET Core, and AWS.
  • Collaborate with cross-functional teams to build and scale highly available, multi-tenant distributed architectures.
  • Mentor junior engineers, participate in technical decision-making, and promote engineering best practices.

Truelogic is a leading provider of nearshore staff augmentation services, delivering top-tier technology solutions to companies of all sizes from startups to Fortune 500 enterprises. With a team of over 600 highly skilled tech professionals based in Latin America, they drive digital disruption and foster a culture that values expertise, aspirations, and career growth.

India

  • Design, build, test, deploy, and maintain scalable and reliable platform services and shared libraries.
  • Contribute to platform and system architecture decisions with a focus on reliability, scalability, and developer experience.
  • Mentor and support junior and mid-level engineers through code reviews, pairing, and technical guidance.

Oportun is a mission-driven financial services company that aims to put its members' financial goals within reach. They have provided more than $21.3 billion in responsible and affordable credit and saved its members more than $2.5 billion in interest and fees.

Global

  • Design, develop, and maintain scalable backend services and APIs using C# and .NET 10
  • Build and maintain secure, reliable integrations with third-party systems and external APIs
  • Ensure systems are observability-first through effective logging, metrics, monitoring, and alerting

Smart Working believes that your job should feel right every day. They connect skilled professionals with global teams for full-time, long-term roles and help you discover meaningful work with teams that invest in your success.

US

  • Design, develop, and maintain scalable web/Windows applications using .NET technologies.
  • Integrate back-end API services with front-end UI components across multiple application modules.
  • Lead technical discussions within the Scrum team and conduct thorough code reviews.

Globe Life is an insurance company committed to empowering employees with support and opportunities. They foster a caring and innovative culture focused on diversity and inclusivity.

$150,000–$170,000/yr

  • Collaborate with Engineering, Finance, and Data Science to define and execute the payments and billing roadmap.
  • Identify areas of opportunity and drive the delivery of improvements for bank account connectivity.
  • Develop the strategy for how Acorns will leverage technologies to reduce friction for our customers and implement the proper controls.

Acorns is a financial wellness app that helps everyday people and families save and invest money for the long term. Since 2014, Acorns has grown into a global company with multiple life-stage products serving the needs of kids, teens, adults, and parents.

Europe 5w PTO

  • Ownership of the full software development life cycle.
  • Work with cloud base architecture focusing on scalability and performance.
  • Address data challenges by implementing robust data engineering practices.

SciLeads is a fast-growing, remote-first SaaS company helping reshape how scientific companies do sales and marketing. They have over 90 people across the UK, Canada, and beyond, and plans to grow to 150+ in the next two years, with a culture of openness, flexibility and innovation.

$120,000–$155,000/yr
US Unlimited PTO

  • Lead strategy and scale for the end-to-end payment lifecycle.
  • Build and mentor a team, initially managing and mentoring one direct report.
  • Optimize and innovate payment flows to eliminate operational bottlenecks.

TrueML is a mission-driven financial software company that aims to create better customer experiences for distressed borrowers. The TrueML team includes inspired data scientists, financial services industry experts and customer experience fanatics building technology to serve people.

$147,873–$198,382/yr
Europe

  • Be responsible for owning and delivering quarterly goals for your team.
  • Support peers and stakeholders in the product development lifecycle.
  • Foster a culture of quality and ownership on your team.

Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest. The company is remote-first and values its employees by providing competitive benefits.

US Canada Unlimited PTO

  • Own the technical delivery of mission critical, event based payment systems handling millions of daily transactions; responsible for the expansion of architectural decisions.
  • Define “what good looks like” by establishing modern standards of AI-enabled workflows, metric driven stewardship required for global scale payments systems reliability.
  • Shape engineering and product strategy jointly, as a bridge between cross functions, co-author of technical roadmaps, guardian of technical backlogs and a driving force behind engineering standards.

Lightspeed's one-stop commerce platform helps merchants innovate to simplify, scale, and provide exceptional customer experiences. Founded in Montréal, Canada in 2005, Lightspeed is dual-listed on the New York Stock Exchange (NYSE: LSPD) and Toronto Stock Exchange (TSX: LSPD).

Global Unlimited PTO

  • Design, implement, and maintain our payment integrations platform, including partner APIs, SDKs, and embedded web experiences.
  • Help shape and drive the technical roadmap for the Partner Engineering team.
  • Design and develop scalable APIs and integrations to support money movements across banking partners via payment rails such as ACH.

Flex is a growth-stage, NYC headquartered FinTech company that creates the best rent payment experience. The company has an enthusiastic user base and is committed to radical transparency, integrity, and individual growth.

Bulgaria UK

  • Develop backend services and APIs using C# .NET/.NET Core with scalable, maintainable, and well-tested code.
  • Integrate with third-party APIs such as payment gateways and work in cross-functional scrum teams.
  • Advocate for engineering best practices and contribute to technical choices for web and mobile applications.

CreateFuture is an AI-native consulting partner that builds digital products and services for clients like PayPal, adidas, and NatWest. The company has grown to over 600 employees and is a Great Place to Work-Certified™ firm with multiple Best Workplaces UK awards.

US Latam

  • Develop, test, debug, and maintain scalable application features aligned to ticket specifications and business requirements.
  • Contribute to Portal 2’s API-driven architecture using modern development patterns and cloud-native technologies.
  • Build maintainable backend services and frontend experiences that prioritize performance, reliability, and usability.

RYZ Labs is a startup studio founded in 2021 by two lifelong entrepreneurs. They focus on early-stage company creation, attracting bright talents to build industry-defining companies using cutting-edge cloud computing technologies to create scalable and resilient applications.