Senior Backend Developer

Job DescriptionNote: Please fill out this form to apply. (Only applications through this link will be considered)https://forms.gle/Pc3znrPDg3muuXZy6About UsAthlitix Inc. is a US-based startup building cutting-edge sports technology that will change how athletes train and get recruited. Join us to make a real impact with high ownership and creative freedom.Role SummaryAs a Senior Backend Developer, you will be responsible for designing, developing, and maintaining robust and scalable backend systems. You will leverage your expertise in Python, databases, and cloud technologies to build high-performance APIs and ensure the reliability and security of our applications. This role requires a strong understanding of distributed systems, real-time data processing, and best practices in security and compliance.Technical qualifications:Backend: 4+ years Python (FastAPI, async/await, type hints); 3+ years PostgreSQL (production, optimization, indexing, PgBouncer, ACID, replicas, materialized views); 2+ years Redis (production, caching, TTL, Pub/Sub, cluster, session, distributed locks); API (RESTful, versioning, rate limiting, cursor pagination, JWT/OAuth, OpenAPI/Swagger).Cloud & DevOps: 3+ years AWS (EC2, Auto-Scaling, S3, RDS, CloudFront, ALB, Lambda, IAM, Route 53); 2+ years Terraform (modules, state, multi-environment); GitHub Actions (CI/CD, automated testing/deployment); Docker (best practices, multi-stage, Compose, optimization, security); Monitoring (Prometheus & Grafana OR ELK/equivalent, structured logging, alerting, APM).Real-Time & Distributed: WebSocket (scalable, connection management, heartbeat, horizontal scaling); Message Queues (Redis Pub/Sub, RabbitMQ, Kafka for event-driven, background jobs); Distributed Systems (CAP theorem, eventual consistency, caching, race conditions).Security & Compliance: Auth/Auth (JWT, OAuth 2.0, token rotation, session, RBAC); Security Best Practices (input validation, sanitization, SQL/XSS/CSRF prevention, rate limiting, encryption); Compliance (GDPR, COPPA fundamentals, data retention, audit logging).Database & Performance: DB Optimization (query profiling, index design, N+1 resolution, connection pooling, caching); Performance Optimization (API response, load testing, caching, profiling tools).Essential AttributesSelf-starter: Independent ownership from design to deployment.Problem solver: Strong debugging and troubleshooting for complex distributed systems.Communication: Clear written and verbal communication for documentation, code reviews, and technical discussions.Detail-oriented: Strong attention to security, edge cases, and error handling.Adaptable: Comfortable in a fast-paced startup environment.Collaborative: Effective teamwork with mobile developers, AI engineers, and product team.User-focused: Prioritizes safety and compliance for a platform serving minors.Work StyleComfortable with remote/asynchronous work.Proactive in identifying issues and proposing solutions.Committed to code quality, testing, and documentation.Eager to learn new technologies and best practices.Responsive to feedback and willing to iterate.Additional Nice-To-Have Technical Skills(Beneficial, Not Required)Social Platform Experience: Social networks, messaging apps, feed ranking, content moderation, user engagement.Payment Integration: Stripe API, subscription management, multi-currency, webhook processing.Email Infrastructure: SendGrid/AWS SES, email templates, deliverability optimization.Internationalization: Multi-language, multi-region deployment, timezone handling.GraphQL: API design, implementation, schema design, query optimization.Other Languages: Go, Rust, js, dart knowledge.Message Queue Systems: RabbitMQ, Kafka, AWS SQS, event-driven architecture, background jobs (Celery).Content Delivery: CDN optimization, video streaming (HLS, DASH), image optimization.Mobile Backend Experience: Firebase Cloud Messaging (FCM), push notifications, mobile API optimization.Compensation & BenefitsCompetitive annual salaryAnnual review for performance-based bonus and salary increase100% remote position, collaborating directly with our US-based teamClear technical leadership track with opportunity to shape architecture decisionsFlexible work hours with modern tech stack Tight-knit, ambitious team with direct influence on product directionHealth and life insurance benefits