The Full Stack Developer will design, develop, and optimize robust backend systems and APIs for a scalable AI-driven SaaS product, leveraging various technologies and cloud services.
#LI-Remote
The Opportunity
FE International/LTV SaaS Growth are currently looking for a highly skilled Full Stack Developer to build and scale a SaaS product. The ideal candidate should have strong backend expertise, experience with scalable architectures, and hands-on exposure to cloud-native systems and search-driven applications.
You will be responsible for designing, developing, and optimizing backend services, APIs, and infrastructure that power a high-performance, AI-driven writing and productivity platform.
Key Responsibilities
- Design and build scalable backend systems for a high-performance SaaS product
- Architect and implement RESTful APIs to support web and product features
- Translate product requirements into efficient system and database designs
- Optimize system performance for speed, scalability, and reliability
- Design data flow across services involving search, caching, and asynchronous processing
- Build and maintain secure and reliable cloud-based infrastructure on AWS
- Implement and manage containerized services for deployment and scaling
- Ensure system observability through logging, monitoring, and error tracking
- Collaborate with product and engineering teams to define technical solutions
- Participate in architecture decisions for scaling multi-tenant SaaS systems
- Identify bottlenecks in existing systems and implement performance improvements
- Ensure code quality through reviews, testing practices, and engineering standards
Required Skills
- Minimum 5 years of experience, including at least 2 years in end-to-end backend development.
- Node.js and Express.js: server-side development, REST API design, middleware patterns
- Deep understanding of JavaScript (ES6+, async/await, event loop)
- MySQL (schema design, optimization, connection pooling)
- Redis (caching, sessions, rate limiting)
- Elasticsearch (indexing, querying, lifecycle management)
- Hands on experience with AWS services: EC2, RDS (Aurora), ElastiCache, SQS, S3, SES, ECR, ECS
- Strong experience with Docker & Docker Compose
- Writing Dockerfiles and managing containerized deployments
- Git version control and branching strategies
Preferred / Nice to Have
- Experience with Stripe API (subscriptions, billing, webhooks)
- Understanding of SaaS billing models (subscriptions, trials, usage-based pricing)
- Experience with Elasticsearch custom analyzers & text similarity
- Exposure to third-party APIs such as: Customer.io, TaxJar, reCAPTCHA, Azure Cognitive Services
What We’re Looking For
- Strong problem-solving ability and system design mindset
- Experience building scalable SaaS or high-traffic backend systems
- Ownership mindset and ability to work in fast-paced environments
- Interest in AI-powered productivity or writing tools (plus)
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