[Remote] Senior Software Engineer

Note: The job is a remote job and is open to candidates in USA. Fastn provides AI-powered embedded integration infrastructure that helps SaaS companies connect with their customers' environments. The Senior Software Engineer will architect, develop, and scale core infrastructure, APIs, and integration workflows while leading engineering teams and driving technical strategy for a high-performance integration platform.

Responsibilities

• Architect & Build: Design and develop core infrastructure, APIs, and integration workflows that power Fastns platform
• Scalability & Performance: Build and optimize distributed systems that handle millions of transactions per second/minute with sub-millisecond response times
• AI-Powered Integrations: Leverage AI-driven automation, data mapping, and smart API connectivity to enhance the integration experience
• Security & Compliance: Implement industry-best practices for API security, data privacy, and regulatory compliance (SOC 2, GDPR, etc.)
• Technical Leadership: Lead and mentor teams, fostering a culture of high performance, innovation, and technical excellence
• Collaboration: Work cross-functionally with product, design, and customer success teams to create a world-class developer experience
• Strategic Impact: Influence product and technology strategy, ensuring Fastn remains at the forefront of AI-powered integration infrastructure

Skills

• 5+ years of software development experience, ideally in high-performance SaaS platforms, API infrastructure, or distributed systems
• Proven track record of building and leading engineering teams in high-growth environments
• Strong expertise in backend development using Java, Python, or Node.js (Fastns stack is flexible)
• Deep knowledge of high-performance, low-latency systems with sub-millisecond response times
• Experience designing and working with RESTful and GraphQL APIs
• Expertise in database design & optimization (PostgreSQL, DynamoDB, or similar) for massive-scale applications
• Experience with cloud platforms (AWS, GCP, Azure) and serverless architectures
• Knowledge of event-driven architectures and message queues (Kafka, RabbitMQ, etc.) for handling millions of transactions per second/minute
• Strong understanding of API security & authentication (OAuth, JWT, OpenID)
• Experience with AI/ML-driven automation in integrations is a plus
• Experience with iPaaS (Integration Platform as a Service) tools like Mulesoft, Workato, or Tray.io
• Hands-on experience with distributed systems and real-time data processing pipelines
• Previous work in developer tooling, B2B SaaS integrations, or API marketplaces

Benefits

• Meaningful equity
• A flexible remote work environment

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