Source Job

• 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.

• Design and build scalable risk detection systems to protect Airbnb's payments platform.
• Collaborate with data scientists and product managers to respond to fraud and risk issues.
• Build integrations with payment partners and processors to enhance risk systems.

Airbnb is an online marketplace for lodging and travel experiences, connecting hosts with guests globally. The company has grown to over 5 million hosts and 2 billion guest arrivals, fostering a culture of inclusion and belonging.

• Build and operate large-scale backend systems that detect fraudulent activity using rules, machine learning models, and high-volume data pipelines.
• Investigate end-to-end systems to understand how fraudulent listings are created and where vulnerabilities exist.
• Partner with machine learning engineers, data scientists, product managers, and operations teams to deliver high-impact fraud prevention initiatives.

This partner company is a mission-driven trust organization focused on protecting users from fraudulent listings and harmful experiences. They operate a global platform and value curiosity, technical depth, and collaboration among their teams.

• Architect and ship AI-powered features that change how service businesses operate, creating net-new capabilities.
• Build and maintain large-scale systems processing billions in payments and serving 120,000+ businesses with reliability.
• Own your work end to end from technical design through production, with full accountability for performance.

Genius AI builds AI-powered products that handle admin work for local businesses, automating booking, marketing, client management, and finances. The company has saved businesses over 106 million admin hours and facilitated more than 624 million client touch points, fostering a culture of ownership and AI-first collaboration.

• 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.

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 that values transparency and employee well-being, offering competitive benefits and a collaborative culture.

• 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.

• Design and build integrations, APIs, and data exchange systems connecting Wrapbook to accounting and ERP systems.
• Own integration pipelines and SLAs end-to-end, ensuring reliable data movement with clear metrics.
• Provide technical direction through design reviews and pair programming, and participate in on-call rotation.

Wrapbook is the AI platform for production finance, building a system of action for finance teams. With backing from Andreessen Horowitz and others, the company has 350+ employees and uses AI to empower finance teams.

• Build integrations that unlock Luna’s next capabilities
• Design infrastructure that scales to hundreds of thousands of individual practice servers
• Engineer reliability into the system: data consistency, idempotency, retries, error handling, observability

Praxipal builds an AI-powered healthcare admin workforce to address the global shortage of medical staff. The company is backed by one of Europe's leading investors and is one of the fastest growing healthtech startups in Germany, with a team that has previously worked at top tech companies.

• Design and build distributed data systems handling large-scale ingestion and processing.
• Drive architectural decisions and take end-to-end ownership of critical components.
• Collaborate with product teams to translate ambiguous requirements into robust technical solutions.

Our partner builds a large-scale, multi-chain data platform that ingests, models, and delivers blockchain data to users and developers. They are a remote-first, distributed team with a strong engineering culture focused on ownership and collaboration.

• Build and maintain backend systems for payment integrations platform.
• Collaborate with cross-functional teams including Engineering, Product, and Sales.
• Design robust, fault-tolerant systems with multiple external dependencies.

Flex is a growth-stage FinTech company that enables users to pay rent on a flexible schedule. It has a diverse, inclusive team with employees across the US, Australia, Canada, and South America.

• Design, develop, deploy, and operate scalable services supporting high-volume digital marketplace workflows and customer-facing experiences.
• Build APIs and backend services within a modern, cloud-native and AI-enabled technology environment.
• Partner with Product, Data, Infrastructure, and SRE teams to deliver reliable platform capabilities.

Our partner is an AI-first engineering company that builds and operates high-value digital marketplace systems at significant scale. They are a modern organization with a global, collaborative culture and offer competitive compensation and opportunities for professional advancement.

• Set the long-term technical vision and architecture for backend systems powering experimentation, personalization, and analytics.
• Architect and evolve high-throughput distributed systems and APIs for real-time data processing with low latency and high availability.
• Lead complex, multi-team technical initiatives end-to-end, from problem framing through implementation and long-term operational ownership.

Webflow is the agentic web marketing platform for modern marketing teams, helping organizations build, manage, and optimize high-performing web experiences. They have a remote-first culture that values craft, quality, and moving fast, with a focus on innovation and collaboration.

• Build and ship features for North, Cohere's AI workspace platform.
• Develop autonomous agents that interact with sensitive enterprise data.
• Collaborate with researchers to productionize state-of-the-art models and techniques.

Cohere is a security-first enterprise AI company that builds cutting-edge foundation models and products for business. Headquartered in Toronto with offices globally, the company has a team of researchers, engineers, and designers passionate about their craft.

• Work cross-functionally with product, design, and engineering to build novel products and features that users will love.
• Contribute to the full development cycle including technical design, development, test, experimentation, analysis, and launch.
• Lead a team of engineers, set standards for developer workflows, and mentor team members to further their professional development.

Reddit is a community of communities built on shared interests, passion, and trust, hosting authentic conversations with over 100,000 active communities and approximately 130 million daily active users. It is one of the internet's largest sources of information, fostering an open and collaborative culture.

• Build and maintain high-throughput backend services on the AdServer and Exchange platform.
• Implement and improve Real-Time Bidding and auction logic with demand and supply partners.
• Collaborate with product and engineering teams to drive AI-native development.

Life360 provides a mobile app and tracking devices to keep families connected and safe, with features like location sharing and crash detection. With over 500 remote-first employees, the company fosters a culture of innovation and high agency.

• Build and ship customer-facing products across web, desktop, and mobile.
• Design, develop, and maintain backend services, APIs, and cloud infrastructure.
• Take ownership of high-leverage problems and collaborate across a small engineering team.

This company operates an ambitious AI research and product environment spanning web, desktop, mobile, backend, and AI systems. It is a small, collaborative engineering team that values autonomy, technical excellence, and low-ego collaboration.

• Drive system design, task decomposition, and technical direction for modernizing technology with AI-led practices.
• Own the full software lifecycle using AI tools for code generation and testing, while applying human judgment to validate output.
• Raise the engineering bar by coaching the team on how to specify, delegate, and validate effectively.

ComPsych is the worldwide leader in organizational mental health, well-being, and absence management, serving over 160 million lives across 200 countries. For over 40 years, they have combined technology with human expertise, and 40% of the Fortune 500 choose their solutions.

• Design, build, and operate production-grade agentic systems for developers.
• Develop core agent infrastructure including orchestration, tool execution, and evaluation.
• Own projects end to end from opportunity identification to launch and iteration.

Our partner is a fast-growing Series C technology company that builds AI-powered developer tools. The organization is fully remote with an autonomous culture focused on engineering ownership and collaboration.

• Design and build production-grade systems that are reliable, scalable, and observable, owning them end-to-end.
• Debug complex production issues across multiple layers and improve performance, latency, reliability, and cost efficiency.
• Apply machine learning as needed, framing problems correctly and building reproducible pipelines for deployment and monitoring.

Moniepoint Inc. is Africa’s all-in-one financial platform, helping 20 million businesses and individuals access seamless payments, banking, credit, cross-border, and business management tools each month. As Nigeria’s largest merchant acquirer, we process over $250 billion in digital payment transaction value annually and prioritize a culture of innovation, teamwork, and growth.

• Design and scale backend systems powering consumer-facing products
• Build and refine APIs that deliver instant, seamless experiences
• Collaborate with product, credit/finance, compliance, support, and analytics teams

Tilt is a fintech company using mobile-first products and machine learning-powered credit models to assess financial potential beyond traditional credit scores. With millions of customers worldwide and a remote-first team across 14 countries, Tilt fosters a collaborative, inclusive culture that values impact and mutual respect.