Senior Software Engineer

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.

Requirements

• 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 (Fastn 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.

Benefits

• Competitive compensation
• Meaningful equity
• Flexible remote work environment