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Tengwar

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100% Private Enterprise AI

for Your Team

Transform your internal documents into a conversational AI assistant that stays 100% Local & Private.

  • 20+ File Formats
    Works with your existing documents
  • GDPR/LOPD Compliant
    Built for European data regulations
  • Role-Based Access
    Department & permission-level security
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Custom software solutions forged for success.

18+ years building reliable Desktop and Web Apps with .Net, WPF, React, Python & C++.

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Services

Web Apps

Design & build fully containerized full-stack web platforms — from focused MVPs to scalable production systems. Opinionated where it helps, flexible where it counts.

  • Frontend: React, Next.js, Svelte – accessible & performant
  • Backends & APIs: .NET Core, Next.js, Flask - robust & lightweight
  • Containerization: Docker & Compose - Kubernetes-ready architecture
  • Data: SQL / NoSQL - document or relational

Desktop & Mobile Apps

High-quality native & cross-platform applications that feel fast, stable and trustworthy — from internal tooling to customer-facing products.

  • Desktop: WPF (.NET) MVVM - rich UI & accessible
  • Cross-platform desktop: Electron - secure IPC & auto-updates
  • Mobile: React Native or Swift - shared logic or native iOS polish

AI Integration

Embed practical AI into existing products & operations — safely, measurably, and aligned with your data governance.

  • RAG systems: vectorized knowledge bases (pgvector, Pinecone) for internal docs
  • Internal chatbots: secure Q&A over policies, SOPs & product guides
  • AI agents: appointment scheduling, support triage, lead qualification
  • Automated SEO: research, content briefs, structured metadata suggestions

Selected Work

HxGN Robotic Automation

Desktop platform for modelling, simulating & executing robotic inspection cells with 3D visualization and multi-vendor robot program generation.

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ARIX Robotics Platform

Cloud platform for managing fleets of autonomous mobile robots with multi-tenancy, real-time telemetry and task scheduling.

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TENGWAR — RAG Assistant

Local-first AI assistant powered by retrieval-augmented generation for secure, private document analysis and knowledge management.

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About

I'm Sergio — solo founder of Fëanor's Code. I build robust back-end services, elegant UIs, and pragmatic software solutions with a focus on clarity, stability, and maintainability.

Beyond traditional development, I help small and mid-sized companies leverage Retrieval-Augmented Generation (RAG) to enhance employee productivity. From custom internal knowledge assistants to automated document workflows, my mission is to bring practical AI tools to teams that want real results — without unnecessary complexity.

Expect senior-level communication, pragmatic decisions, and code built to last.

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