Senior Fullstack Engineer, Lending (Clasp Finance)

WHO WE ARE ABOUT STRIPE Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. ABOUT THE TEAM Before Stripe, every growing internet platform had a payments team. Today, every growing internet platform has an Identity team. Identity verification has become core economic infrastructure for online businesses — enabling them to digitally verify their users' identities for fraud prevention, regulatory compliance, and trust and safety purposes. At Stripe, we're building something more ambitious than a verification product. Our vision is to build the world's most trusted store of verified identities — a single, global, reusable, risk-scored representation of every individual who interacts with Stripe and beyond. This Identity Store becomes a platform with compounding network effects: more verifications enrich the store; a richer store produces better fraud signals; better signals mean lower friction for trusted users; lower friction drives more adoption. Our product today serves millions of verifications per month for customers like OpenAI, Shopify, and WhatNot, and powers identity verification across multiple internal Stripe products including Fraud, Link, Connect, and Crypto. The problems ahead — adversarial AI and deepfake defense, networked identity infrastructure, progressive verification platforms, and low friction KYC APIs — sit at the frontier of what's possible in identity engineering. This role is open to candidates based in our Seattle, New York, or San Francisco offices, or remote within the US. For Stripes who live within 35 miles of an office, we offer a hybrid work environment with an expectation of in-office presence 50% of your working days each month. WHAT YOU'LL DO As a Full Stack Staff Engineer on the Identity team, you will own the technical direction of one of Stripe's most strategically important product areas. This is not a role defined by task execution — it's a role defined by technical judgment, architectural influence, and the ability to turn an ambitious vision into a reliable, scalable system. RESPONSIBILITIES * Own technical strategy — Define the architecture for Identity's core systems (Identity Store, headless verification platform, fraud detection infrastructure), make build vs. buy vs. partner decisions, and surface technical risks before they become customer-facing failures * Lead 0-1 platform development — Architect net-new systems including the Identity Store, Networked Identity platform, and advanced fraud detection pipeline (behavioral biometrics, deepfake discriminators, adversarial training). Drive the evolution from a hosted-UI product to a headless-API and embedded-components platform * Drive cross-functional alignment — Be the primary technical voice in roadmap and resourcing discussions. Partner with ML, product, legal, and engineering leads across Risk, Fraud, Link, Connect, and Crypto to ensure Identity's abstractions serve the full breadth of Stripe's product surface * Raise the technical bar — Set engineering standards across ML, backend, mobile, and front-end; lead design reviews; and mentor senior engineers on the judgment needed to operate a high-stakes, externally-facing product * Operate with ownership — Be accountable for reliability, scalability, and security of the systems you design — including the observability and alerting that catch model drift and fraud pattern shifts before customers do WHO YOU ARE We're looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement. MINIMUM REQUIREMENTS * 10+ years of software engineering experience, including 5+ years of experience in a strategic technical leadership role * Experience leading engineering team(s) working on API design, abstractions, frameworks, or client libraries (e.g. building internal or external developer products) * Proven track record of delivering pragmatic solutions that accelerate business growth * Ability to adjust conversations from high-level discussions to detailed coding * Clear and persuasive writing and in-person communication PREFERRED QUALIFICATIONS * Experience with identity verification, fraud detection, or trust and safety systems — especially systems with adversarial inputs at scale * Familiarity with ML systems in production: model serving, training pipelines, observability, drift detection, and the feedback loops that keep models accurate under adversarial conditions * Experience building platform products with multiple consumer types — internal platform teams and external developers — where API backward compatibility and abstraction quality are first-class concerns * Prior experience with 0-1 product builds: you've started with a blank page and ended with a production system, and you have clear opinions about what makes that process go well or poorly * Experience across a range of software languages and frameworks; our stack includes primarily Ruby and TypeScript on the backend, Python for ML and data pipelines, with infrastructure spanning Kafka, Temporal, Protobuf, React, SQL (Spark and Trino dialects), Airflow, Bazel, Mongo, Splunk, and Prometheus * Experience navigating ambiguity in a fast-moving organization — you can make confident technical decisions with incomplete information and update gracefully when new constraints emerge

YOUR MISSION Remote (CET) About Us At Graswald AI, we’re building the AI operating system for fashion brands and retailers, starting with AI image and content generation. Our engineering team tackles rapid scaling challenges, GPU-intensive workloads, and enterprise-grade infrastructure to deliver fast, pixel-perfect results for global brands. In the past year alone, we’ve signed 50 enterprise fashion clients who rely on us to reduce costs and accelerate creative timelines. Backed by leading VCs and strategic investors including Lakestar and Orendt Studios, and preparing for a Series A later this year, we’re growing fast and building technology that is already reshaping how fashion content is produced The Role: The Senior Full Stack Software Engineer is a core member of a product team, responsible for designing, building, testing, and deploying high-quality software. Engineers work closely with their Team Lead (TL) and Product Manager (PM) to turn product requirements into reliable, scalable features that deliver real value to users. Engineers at Graswald operate in a highly dynamic environment, where requirements and architectures evolve quickly. This role requires comfort with ambiguity, strong ownership, and the ability to make pragmatic technical decisions with incomplete information. YOUR PROFILE Key Responsibilities * Software Design & Quality: Design and optimize scalable backend systems and high-performance frontend applications, ensuring security, performance, and maintainability. Write clean, well-documented code and participate in code reviews to ensure quality, and reliability. * Problem-Solving & Troubleshooting: Identify, analyze, and resolve technical issues in development and production environments, and proactively improve existing systems where needed. * Collaboration and Teamwork: Work closely with your TL, PM, and peers to align on priorities, surface blockers early, and collaborate on design and problem-solving. Contribute to technical design discussions and propose solutions. * Requirement Understanding & Implementation: Work closely with the PM and TL to understand product requirements, user stories, and technical specifications. Translate these into practical and effective technical implementations. * Continuous Learning & AI-Driven Development: Maintain a strong dedication to continuous learning and professional development, staying current with industry trends, emerging technologies, and best practices. Actively explore, learn, and apply new AI capabilities and tools to enhance personal productivity, improve software development processes, and contribute to innovative solutions. Embrace and experiment with AI-powered development practices within the team.Research and evaluate new technologies or approaches to solve technical challenges. * Documentation: Create and maintain clear, concise technical documentation for code, system designs, and processes to facilitate understanding and onboarding for current and future team members. Qualifications: skills, abilities, and experience * Experience * Minimum 5 years of experience writing excellent, standards-compliant code. Demonstrated ability to independently design, build, and maintain production-grade software systems. * Experience working on the engineering team in a start-up, scale-up or product-driven company * Experience designing and evolving backend systems that operate reliably under increasing load. * Strong experience writing high-quality, maintainable, standards-compliant code in production systems. * Strong understanding and experience with building and consuming API-driven solutions. * Demonstrable experience with Agile or Scrum software development methodologies. * Specific Technology Focus * Mastery of Python and Django and strong skills in TypeScript and React. * Experience with database technologies, cloud platforms (e.g., AWS, Azure, GCP), and API design principles. * Strong analytical and problem-solving abilities, with a methodical approach to debugging and issue resolution. Soft Skills: * Strong communication skills, high integrity, and great attention to detail. * An entrepreneurial spirit with the ability to adapt and grow quickly as the organization scales. Nice to have: * Experience with generative AI tooling (Stable Diffusion, ComfyUI) or creative platforms (p5.js, Three.js). Education: * A minimum of a Bachelor's degree in Computer Science, Information Technology, or a similar technical field. WHY US? Why Join Us: Impact: Help redefine AI-driven content creation for the world’s biggest brands. Innovation: Work with cutting-edge AI models and push the boundaries of generative visuals. Fast-Paced Execution: We move quickly, iterate rapidly, and work closely with customers to build what they need. Growth: Join a high-caliber, fast-scaling startup with huge opportunities for career advancement. Culture: Be part of a passionate, collaborative team that values creativity, problem-solving, and technical excellence.