Experience
WERN | Full Stack Engineer (Contract)
Jan 2025 - PresentRemote · Client engagement through WERN:
- Built Python APIs and React/Angular interfaces across 3-5 client codebases, with AWS deployments, Docker/Terraform infrastructure, and LLM/RAG integrations.
Dupely | Back End Developer (Contract through WERN)
Dec 2025 - Apr 2026- Built FastAPI product and pricing endpoints for browser-extension and mobile clients, with pipelines using official Amazon, Walmart, and eBay APIs.
- Owned PostgreSQL schema design, migrations, and query performance; implemented caching for product data.
US EdTech Client (confidential)
Mar 2025 - Dec 2025Full Stack & AI Engineer (Independent Consultant) | Self-employed
RemoteDirect client contract, concurrent with WERN.
- Built an LLM benchmark and evaluation harness covering 20-50 computer-use tasks; evaluation runs informed shipping decisions.
- Integrated LLM/RAG features into a learning management system using pgvector to retrieve learning content.
- Contributed production frontend and backend features in two-week sprints.
Universidad Nacional de Ingeniería (UNI)
Feb 2023 - Dec 2024Full Stack Developer & Systems Analyst (.NET / React) | Full-time
Managua, Nicaragua- Built a warehouse inventory system end to end with .NET and React.
- Maintained an ASP.NET/SQL Server budget system through two annual budget cycles; reduced its heaviest report’s runtime from 6 minutes to 7-15 seconds.
- Mentored approximately 8 developers.
Selected Project
Interview Agent | github.com/Steven-Mendez/interview-agent
- Built a three-agent voice interview application: a planner uses a CV and job description, an interviewer conducts the interview through LiveKit, and an evaluator assesses answers using transcript evidence.
- Implemented a React frontend and FastAPI backend with LangGraph/OpenAI orchestration and PostgreSQL persistence for plans, transcripts, and evaluations.
Technical Skills
Languages: Python, TypeScript/JavaScript, C#, SQL
Backend & Data: FastAPI, Django, Flask, ASP.NET, PostgreSQL, SQL Server, Redis, REST APIs
Frontend: React, Angular, Next.js
Cloud & Tools: AWS (Lambda, ECS, S3, RDS, SQS, CloudWatch), Docker, Terraform, CI/CD, Git
AI Applications: LLM/RAG integration, LangChain, LangGraph, pgvector, Qdrant, LiveKit
Education
Universidad Nacional de Ingeniería
Mar 2019 - Dec 2023Bachelor of Engineering (B.Eng.), Computer Engineering