Senior FullStack Developer
Lean Solutions Group3 days ago
Medellín, ColombiaSenior
Responsibilities
- Build IQ Billing features end to end across the data layer, backend services, and user interface.
- Develop React interfaces with polished loading, empty, and error states.
- Build Node.js services for data manipulation, transformation, and management using Nest.js, Express.js, or similar frameworks.
- Design and maintain clean, type-safe architecture across the full stack.
- Build integrations with LLM APIs, including streaming responses, tool calling, and prompt iteration.
- Use AI coding assistants thoughtfully and determine when to trust or override their output.
- Collaborate independently, take ownership of projects, and contribute to a high-quality product experience.
- Mentor teammates and apply strong debugging, communication, and problem-solving skills.
Requirements
- At least 4 years of production full-stack development experience.
- Strong JavaScript or TypeScript skills and deep React fluency, including hooks, component design, and modern React patterns.
- Strong Node.js experience, with Nest.js, Express.js, or similar backend experience.
- Solid relational database experience, particularly PostgreSQL, including non-trivial SQL.
- Experience building with LLM APIs such as Anthropic or OpenAI, including streaming responses, tool calling, and prompt iteration.
- Daily experience with AI coding assistants such as Claude Code, Cursor, or GitHub Copilot.
- Experience delivering polished user interfaces and maintaining clean, type-safe architecture.
- Preferred experience with Python data tooling such as pandas or Polars and API frameworks such as FastAPI, Flask, or Django.
- Preferred data pipeline or ETL experience and exposure to Snowflake, BigQuery, or Redshift.
- Preferred experience with Vite, Turbopack, pnpm, bun, Tailwind CSS, component libraries, and design systems such as shadcn or Radix.
- Preferred familiarity with RAG, vector databases, agentic workflows, or MCP servers.
- Preferred cloud experience with AWS or GCP, including serverless systems, containers, and queues.
- Preferred exposure to Datadog, Sentry, OpenTelemetry, and WCAG accessibility standards.
- Strong problem-solving, debugging, communication, collaboration, ownership, and attention-to-detail skills.
Tech Stack
Amazon RedshiftAWSDatadogDjangoExpressFastAPIFlaskGoogle BigQueryGoogle Cloud PlatformJavaScriptNestJSNode.jsPandasPostgreSQLPythonReactSnowflakeSQLTailwind CSSTypeScript
Categories
About Lean Solutions Group
Lean Solutions Group provides AI-driven automation, software development, and tech-enabled staffing for logistics, transportation, and other U.S. businesses. Through its Global Technology Services (Lean Tech) arm, it offers team augmentation, RPA/ML solutions, and project delivery for engineering teams. The privately held company is headquartered in Medellín, Colombia, and operates across Latin America and the U.S.