Source Job

US

  • Design, develop, and launch backend systems at scale using Python or Kotlin.
  • Collaborate with team and stakeholders to balance speed and quality while protecting system reliability.
  • Contribute to community through growth and development activities and navigate large codebases.

Python Kotlin AWS MySQL Kubernetes

20 jobs similar to Senior Software Engineer, Backend (Partner Merchant Interface)

Jobs ranked by similarity.

US

  • Own and deliver quarterly goals for your team, leading engineers through ambiguity to solve open-ended problems.
  • Support peers and stakeholders in the product development lifecycle by collaborating with product management, design, and analytics.
  • Foster a culture of quality and ownership by setting code review and design standards, and developing talent on your team.

Affirm is a financial services company that provides buy now, pay later financing without hidden fees or compounding interest. They have millions of customers and thousands of merchant partners, and foster a culture of honesty, trust, and innovation.

Spain

  • Design, develop, and launch scalable backend systems to support Affirm's international expansion.
  • Collaborate with product, design, and analytics to define technical plans and deliver high-quality features.
  • Foster a culture of quality through code reviews, mentoring, and proactive problem-solving.

Affirm is reinventing credit to make it more honest and friendly, offering buy now pay later without hidden fees. The company is a global leader in fintch, fostering a culture of innovation, collaboration, and people-first values.

Poland

  • Own and deliver quarterly goals for your team, guiding engineers through ambiguity to solve open-ended problems.
  • Collaborate with product management, design, and analytics to articulate technical constraints and make risk-aware decisions.
  • Foster a culture of quality and ownership by setting code review and design standards, and developing talent through feedback and guidance.

Affirm is a financial technology company that provides buy now, pay later solutions, aiming to make credit more honest and friendly. It is a publicly traded company with a remote-first culture and a global team, emphasizing employee well-being and growth.

Poland

  • Own and deliver quarterly goals for your team, leading engineers through ambiguity to solve open-ended problems.
  • Collaborate with product management, design, and analytics to articulate technical constraints and partner on decisions.
  • Foster a culture of quality and ownership by setting or improving code review and design standards.

Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without hidden fees. They are a remote-first company with a culture of inclusion, offering comprehensive benefits and growth opportunities.

Poland

  • Set technical strategy for your team on a year-long scale, driving business-impacting projects.
  • Collaborate across teams with product, design, and analytics to ensure technical sustainability.
  • Foster a culture of quality and ownership through code review standards and technical advocacy.

Affirm is a financial technology company that offers buy now, pay later services, aiming to make credit more honest and friendly. It is a large public company with a global team and a culture focused on innovation, inclusion, and employee well-being.

Spain

  • Lead delivery of quarterly goals for the Recoveries team, guiding engineers through ambiguity and ensuring support.
  • Collaborate with product management, design, and analytics to define technical constraints and make risk-aware decisions.
  • Foster a culture of quality and ownership by setting code review standards and mentoring team members.

Affirm is reinventing credit to make it more honest and friendly, offering buy now pay later services without hidden fees. They are a remote-first company with a culture of quality and ownership, providing competitive benefits and supporting employee growth.

Global

  • Build and scale the backend systems behind salary advance, FGTS, and consignado lending — with a clear eye on reliability and correctness
  • Develop and refine the APIs that power an instant in-app experience, with the precision those transactions demand
  • Collaborate directly with product, credit, compliance, and analytics — your technical perspective shapes the work

Tilt is a financial technology company that uses mobile-first products and machine learning to provide credit based on real-time financial signals, looking beyond traditional credit scores. With millions of customers worldwide, Tilt fosters a culture of ownership, collaboration, and impact, where good ideas travel fast and growth follows contribution.

$96,000–$141,000/yr
Canada

  • Build and operate backend systems that support accurate customer outcomes after financial transactions.
  • Collaborate with cross-functional teams including product, design, analytics, and compliance.
  • Contribute to system reliability, monitoring, and on-call responsibilities.

The company builds high-scale backend systems for accurate financial transaction processing. They have a remote-first, collaborative engineering culture with a focus on reliability and operational excellence.

UK

  • Own and deliver quarterly goals, leading engineers through ambiguity to solve open-ended problems.
  • Collaborate with product management, design, and analytics to make decisions considering risks and trade-offs.
  • Foster a culture of quality and ownership by setting code review standards and mentoring teammates.

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. We directly improve the financial lives of over 20 million people, with an agile and fast-paced culture focused on ownership and collaboration.

United States UK Italy Spain Poland

  • Build the distributed, event-driven services that turn Cloud Custodian into a platform, including the GraphQL API and policy execution pipelines.
  • Design and operate systems that ensure correctness and observability while running customer governance workloads at scale across multiple clouds and regions.
  • Lead backend initiatives and mentor other engineers in a technical domain involving event-driven systems and relational databases.

Stacklet helps organizations with large cloud estates optimize cost, improve security, and ensure compliance by automating governance via code. Founded by the creators of CNCF's Cloud Custodian, the company supports some of the world's biggest cloud service consumers.

Poland

  • Design and build highly scalable distributed systems to support global expansion across multiple countries and regulatory environments.
  • Partner closely with product, operations, payments, logistics, and platform teams to own critical operational and transactional systems.
  • Work on cross-border transaction infrastructure, tax and regulatory compliance, international post-purchase experiences, and marketplace operational tooling.

Whatnot is the largest live shopping platform in North America and Europe, enabling sellers to build businesses across hundreds of categories. They are a remote co-located team with hubs across the US, UK, Ireland, Poland, Germany, and Australia, and were recently named the #1 Best Startup Employer in America.

Spain

  • Take end-to-end ownership of backend features from refining requirements to delivering robust production-ready solutions.
  • Evolve the system core, APIs, and data layer to optimize performance, scalability, and reliability under demanding workloads.
  • Balance fast product increments with sustainable technical architecture.

Genestack is tackling the underlying computational and scientific challenges of bioinformatics to provide researchers with software tools that streamline the discovery process and drive forward precision medicine, drug development, and bioinformatics research. Their platform is deployed at leading pharmaceutical, agricultural, and consumer goods companies, as well as leading academic institutions, and they are continuing to grow.

US

  • Contribute to technical design decisions for IPC services, balancing delivery speed with long-term maintainability.
  • Design, build, and operate backend services using Python, PostgreSQL, Go, and Java-based Drools.
  • Support production reliability by maintaining SLOs, strengthening observability, and participating in on-call.

Bestow is a leading vertical technology platform serving life insurers, enabling faster product launches through AI and automation. Backed by investors like Goldman Sachs and trusted by major carriers, the company offers flexible work and growth opportunities.

Global

  • Design backend systems and APIs (Python preferred) that run real-time, business-critical accounting logic.
  • Ship features end to end - architecture, CI/CD, testing, monitoring, and beyond.
  • Integrate third-party tools and external systems, proactively managing edge cases and risk.

DualEntry is building the OS for finance, an AI-native ERP that automates accounting from data entry to close. They have raised over $100M from top venture firms and serve customers from startups to public companies, hiring high-agency outliers who have achieved difficult things.

$160,000–$200,000/yr
United States Canada Europe Unlimited PTO 12w maternity 12w paternity

  • Write reliable, secure, and scalable code for Lithic's product platform with minimal tech debt.
  • Improve system reliability and participate in team on-call rotation.
  • Own projects from planning to launch, including API key management, audit logging, and search.

Lithic is a modern card issuing and processing platform for financial companies to build the future of payments. They are a team of 170+ across 26 states and 7 countries, with a remote-first culture.

Global Unlimited PTO

  • Design, build, and maintain scalable distributed backend systems powering platform and product capabilities.
  • Own backend services end-to-end, from architecture to monitoring, while collaborating with product and engineering peers.
  • Build and evolve Web3 platform backend components, including protocol integrations and blockchain network support.

Zerion builds backend systems for Web3 infrastructure, powering API and wallet products trusted by 50+ top crypto brands. They have a fully remote team with strong ownership and high code quality, processing over 3.1B requests and supporting 1.7M+ active funded wallets.

$18,000–$42,000/yr

  • Design, develop, and maintain highly scalable backend services and robust APIs.
  • Define and implement robust API contracts for seamless data integration.
  • Troubleshoot, debug, and optimize performance of backend systems and data pipelines.

Brooklyn Health is solving the measurement problem in mental health through accurate, objective, and sensitive measurement of symptoms. They are a startup backed by leading healthcare and technology investors, building a modern technology stack for CNS clinical trials.

5w PTO 20w maternity 12w paternity

  • Work closely with Engineering Managers, Product Managers, and Product Designers to design solutions and produce high-quality code for 1M+ daily users.
  • Embrace agile methodologies and continuous improvement through blameless post-mortems, architecture reviews, and engineering guild sessions.
  • Engage in DevOps culture, proactively solve complex problems, and use iterative development with A/B testing.

Depop is a peer-to-peer circular fashion marketplace where anyone can buy, sell and discover secondhand fashion. Powered by a team of over 500 people, with headquarters in London and offices in New York, Depop is committed to creating an inclusive environment and became a subsidiary of Etsy in 2021.

Latin America

  • Build and maintain data pipelines and reporting services for financial, payment, settlement, and transaction reporting.
  • Adapt and extend existing reports based on merchant requests, managing multiple priorities and short turnaround times.
  • Contribute to the development of a new self-service Reporting API that enables merchants to generate reports autonomously.

Nortal is a digital transformation company that delivers complex solutions for global enterprises and public sector organizations. They have a remote-first culture focused on autonomy, open communication, and diversity, with a close-knit LATAM team.

Global

  • Build and maintain backend services in Kotlin for the product platform.
  • Design and implement interfaces using REST, gRPC, and Kafka for internal and public clients.
  • Work with data center machines and AWS cloud to improve reliability and performance.

Valka.ai is a visionary spin-off from Realms Group, revolutionizing digital content creation through an interactive human-digital platform powered by AI. They are a small, innovative team of diverse experts driving change in gaming, entertainment, and education.