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Freelancer Overview
Daniel Nicolae Lixandru Senior Full-Stack Engineer (Backend-focused) [email protected] ◆ +40 763 562 422 ◆ Bucharest, Romania ◆ https://github.com/genuinedev114 PROFILE Senior full-stack engineer with 9 years primarily on backend systems for enterprise SaaS, Series A health tech, and global fintech companies, plus hands-on contribution to React and Next.js consumer interfaces and internal admin dashboards. Strong focus on reliable payment systems, event-driven Kafka pipelines, multi- region PostgreSQL setups, and SOC 2 audit work. CORE SKILLS Languages and Frameworks:: TypeScript, JavaScript, Node.js, NestJS, Fastify, Express, React, Next.js, REST, gRPC, GraphQL, Go, SQL Data and Messaging: PostgreSQL, Redis, Apache Kafka, BullMQ, AWS SQS Cloud and Infrastructure: AWS RDS, EKS, Lambda, S3, KMS, ElastiCache, Terraform, Docker, Kubernetes, Istio service mesh Observability and SRE: Datadog APM, OpenTelemetry, PagerDuty, k6 load testing, on-call rotation, incident response Security and Compliance: SOC 2, HIPAA, LGPD, AWS KMS envelope encryption, OAuth, JWT Architecture and Patterns: Microservices, event-driven architecture, event sourcing, idempotency, outbox pattern, circuit breakers, contract testing with Pact, BFF pattern AI/LLM Integration: OpenAI/Claude API, LangChain, RAG systems, Vector databases (Pinecone, Weaviate), Semantic search, Real-time AI streaming, Prompt engineering EXPERIENCE Senior Full-Stack Engineer (Backend-focused) December 2023 – Present | 2+ ye