08/25/2025 updated

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100 % available

Full Stack Developer

Godoy Cruz, Argentina
Argentina
Bsc. Economics
Godoy Cruz, Argentina
Argentina
Bsc. Economics

Profile attachments

CV - Ian Stiefvater

JavaScriptPHPApplication Programming Interfaces (APIs)Artificial IntelligenceAmazon Web ServicesAmazon S3AuditingSoftware as a ServiceCloud ComputingContinuous IntegrationData ManagementDevOpsDjangoExpeditingGitHubSearch Engine OptimizationIdentity ManagementPython (Programming Language)PostgreSQLMarket ResearchMicrosoft SQL ServersMongoDBMySQLNGINXNode.jsPerformance TuningRedisNext.jsData StreamingTime SeriesTypeScriptUmbracoWebSocketWordPressTestingMetricsSQL OptimizationReact.jsFlaskLarge Language ModelsCypress (Programming Language)FastAPIPlaywrightAWS FargateEthereumSolidityTangoGraphQLRoute53CloudwatchApi GatewayTerraformData PipelineServerless ComputingDocker
I’m a full-stack engineer and solopreneur who’s been shipping real products since 2019—starting in technical SEO and WordPress/PHP, then moving into React/TypeScript, Node.js, Python, and cloud-native DevOps. I love taking ideas from zero to production, owning the messy middle (data, infra, performance), and delivering clean, maintainable code that users actually enjoy.
Over the last few years I’ve built and run three flagship projects:
  • GeoValue – A real-estate analytics platform for Argentina that ingests 150k+ listings/month. I designed the ingestion pipeline (Scrapy + Playwright), normalized and deduped data in PostgreSQL, exposed an Express API, and crafted a React UI with Leaflet heatmaps and dashboards. Deployed with Docker, jobs on GCP (Scheduler + Pub/Sub), app hosting on AWS, monitoring, and CI/CD. I stabilized noisy time series with EMA smoothing and materialized views to keep the UI fast and the metrics reliable.
  • GPTWAI (Tango Labs) – An AI/RAG product for market insights. I integrated the OpenAI API (chat + embeddings), implemented retrieval with Pinecone/LangChain, and built a streaming UI over WebSockets. The stack: React/TypeScript, Node.js/Express, PostgreSQL, Docker, and AWS (ECS, Lambda, API Gateway, S3) with GitHub Actions for CI/CD.
  • QUBOC – A micro-SaaS for automated smart-contract audits. Front end in React, back end in Node + Python (Flask), MongoDB, serverless jobs, and an IDE-style interface. I’ve also worked hands-on with Solidity, Ethers.js, Hardhat/Truffle, and operated Ethereum nodes (Geth/Nethermind) for research.
Earlier, at ViralCoach, I built high-volume scrapers (Python/Scrapy, custom JS), a Django platform, and real-time transcription pipelines (ytpl + Whisper). Before that, I led SEO for clients like CTG at Bonsai Media Group (Umbraco), doing audits, schema, Core Web Vitals, and performance tuning—experience that still informs how I think about content, indexing, and page speed.
What I work with daily
  • Front end: React, Next.js, TypeScript, React Query, React Hook Form, Jest, React Testing Library, Cypress.
  • Back end: Node.js/Express, Python (Flask; adopting FastAPI patterns), REST/GraphQL, WebSockets.
  • Data: PostgreSQL/MySQL/SQL Server, MongoDB, Redis, SQL optimization, partitioning, materialized views.
  • DevOps: Docker, Nginx, CI/CD (GitHub Actions), AWS (ECS/Fargate, Lambda, API Gateway, S3, CloudWatch, Route53), GCP (Cloud Run, Scheduler, Pub/Sub), Terraform/IaC, secrets, IAM, cost-aware architectures.
  • AI: OpenAI, embeddings/RAG, LangChain, Pinecone, Whisper; classic analytics (EMA, anomaly rules).
How I can help
  • Build or refactor MVPs and dashboards.
  • Design scalable APIs and data pipelines.
  • Stand up cloud infra with Terraform/IaC, CI/CD, monitoring.
  • Integrate LLMs (chat, RAG, summarization, classification).
  • Technical SEO/performance audits to keep growth compounding.

Experience

Professional experience5 - 10 years
Freelancer since2025

Languages

EnglishFluentSpanishNative speaker

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