Senior Software Engineer
FastnIslamabad, Islamabad Capital Territory, Pakistan
Posted December 12, 2025
Full Time
About the Company
Fastn empowers SaaS companies to seamlessly embed integrations into their products using AI-driven infrastructure. The platform offers a scalable, managed ecosystem that enables rapid deployment of strategic integrations, a proprietary app marketplace, and new revenue channels through partner‑sourced offerings. By simplifying integration complexity, Fastn accelerates market penetration, enhances partner ecosystems, and delivers richer, more connected customer experiences. Its unique blend of AI, embedded integration, and marketplace capabilities sets it apart in the integration-as-a-service space.
Job Description
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.
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
- Market-leading salary
- Meaningful equity
- Flexible remote work environment