[Remote] Senior Software Engineer (FinTech)

Note: The job is a remote job and is open to candidates in USA. Differential is a digital product and software development company focused on building technology and the Apollos platform. The Senior Software Engineer (FinTech) will serve as a hands-on technical leader, owning complex payment and financial systems while shaping architecture, building scalable software, and mentoring engineers.

Responsibilities

• Own the technical design and implementation of complex FinTech 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 projects: our work is never going to be perfect, and we expect you to be able to prioritize what matters most in order to consistently and efficiently iterate and continuously deliver valuable working software
• Know how to leverage AI tools to massively accelerate deliverables while observing and enforcing sound engineering principles
• Gaining an understanding of who the users are, what their problems are, and why those problems exist
• Putting the user — and their problems/needs — first in order to create and drive empathy for the solution you’re building
• Understand, document, keep updated detailed payments system architecture
• Understand and identify edge-cases that need explicit handling in payment systems
• Maintain Payment system regression detection system and uptime detection system
• Translating a well-designed solution of sketches, wireframes, or high-fidelity mockups into fully functioning immersive experiences
• Delivering approachable, modern code for web and mobile applications
• Working closely with a team of product and engineering roles
• Maintaining development workflow with the team’s tooling
• Effectively communicating via Basecamp, Slack, and video calls
• Executing with quality and speed in a fast-paced, sometimes ambiguous environment
• Incorporating feedback into your work
• Delivering tested, maintainable, and documented software using modern AI-powered techniques and approaches

Skills

• 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
• 7+ years of professional software engineering experience
• Strong experience building and scaling production payments software
• Deep understanding of backend architecture, APIs, databases, and distributed systems
• Experience working in FinTech, payments, banking, financial services, or other transaction-heavy systems
• Strong understanding of payment flows, transaction processing, webhooks, reconciliation, or financial integrations
• Experience integrating with third-party APIs and services such as payment processors, banks, or financial platforms
• Strong experience with TypeScript/Node.js, GraphQL, PostgreSQL, and modern cloud infrastructure
• Comfortable working across the stack when needed, including React/React Native
• Strong architectural instincts and ability to make pragmatic technical tradeoffs
• Excellent debugging and problem-solving skills
• Comfortable operating with a high degree of ownership and autonomy
• Communicate effectively with clients and teammates
• Are self-motivated
• Learn quickly and relentlessly
• Are curious about technology and the impact it can make on the world
• Enjoy taking ownership and responsibility for their work
• Enjoy collaborating with others on solving meaningful problems
• Candidates must be based in the United States

Benefits

• Flexible vacation
• Remote work
• Flexibility in working hours

Company Overview