Full Stack Developer

#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 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)