Senior Integration Engineer Location: Remote Type: Full-time About Fastn Fastn is on a mission to revolutionize how SaaS companies connect with their customers' environments. Powered by AI, we provide an embedded integration infrastructure that enables SaaS businesses to build, scale, and manage their integration ecosystem effortlessly. With Fastn, companies can launch strategic integrations, create their own app marketplace, and unlock new revenue streams by offering seamless connectivity with the tools their customers already use. But our platform is more than just integrationsits about accelerating market penetration, driving partner-sourced revenue, and delivering smarter, more valuable customer experiences. If youre passionate about leading integration strategies, scaling API connectivity, and mentoring teams in a high-growth SaaS environment, Fastn is the place to be. What Youll Do As a Senior / Lead Integration Engineer, you will play a critical role in architecting, building, and optimizing integrations between Fastn and a broad ecosystem of SaaS applications. You will lead integration initiatives, mentor engineers, and work closely with product and engineering leadership to drive seamless, scalable, and high-performance integrations. Your Responsibilities • Technical Leadership: Lead the architecture, design, and development of integrations, ensuring they are scalable, high-performance, and secure. • API Engineering: Design and implement robust RESTful, GraphQL, and Webhook-based APIs to enable seamless data flow. • Scalability & Performance: Architect integrations to handle millions of transactions per second/minute with sub-millisecond response times. • Automation & AI-Driven Integrations: Utilize AI/ML-based automation and data mapping to enhance connectivity and reduce manual effort. • Security & Compliance: Implement best practices for OAuth, API authentication, data privacy, and regulatory compliance (SOC 2, GDPR, etc.). • Collaboration: Partner with engineering, product, and customer success teams to ensure integrations align with business and technical goals. • Mentorship & Team Growth: Mentor junior engineers, conduct code reviews, and provide technical guidance to elevate the overall integration team. • Monitoring & Reliability: Establish observability, error handling, and performance monitoring to ensure integration reliability. What Were Looking For Were seeking a highly skilled engineer and leader who thrives in building scalable integration solutions and mentoring teams in a fast-paced SaaS environment. If you enjoy working with APIs, automation, and large-scale systems, this role is for you. Must-Have Skills & Experience • 5+ years of experience in integration engineering, API development, or automation. • Proven track record in leading and architecting scalable API integrations. • Strong expertise in RESTful APIs, GraphQL, Webhooks, and event-driven architectures. • Experience designing integrations that handle millions of transactions per second/minute with low latency. • Proficiency in backend programming languages (Java, Python, or Node.js). • Hands-on experience with cloud platforms (AWS, GCP, or Azure) and serverless architectures. • Strong knowledge of API security, authentication (OAuth, JWT, OpenID), and compliance (SOC 2, GDPR, etc.). • Experience working with message queues (Kafka, RabbitMQ, etc.) and event-driven architectures. • Previous experience leading or mentoring engineers in a high-growth startup or SaaS company. Nice-to-Have Skills • Experience with iPaaS platforms like Mulesoft, Workato, or Tray.io. • Familiarity with AI/ML-driven automation in integrations. • Hands-on experience with developer tooling, B2B SaaS integrations, or API marketplaces. Why Join Fastn? • Shape the Future of SaaS Connectivity Be a key player in defining how SaaS companies scale their integration ecosystems. • Work on Cutting-Edge AI & API Technologies Solve complex integration challenges with AI-driven automation. • High-Impact, Leadership Role Lead integration strategy and mentor a growing team in a fast-paced, high-growth startup. • Strong Engineering Culture Collaborate with top-tier engineers solving large-scale connectivity challenges. • Competitive Compensation Market-leading salary, meaningful equity, and a flexible remote work environment. Join Us in Building the Future of SaaS Connectivity! If youre excited to lead integration initiatives, drive technical strategy, and mentor engineers, wed love to hear from you. Apply now and help shape the future of SaaS integrations!