Vadim Ledyaev

// AI/LLM Engineer

Vadim Ledyaev

On-prem RAG · self-hosted inference · Python + React

●  Currently building on-prem document-analysis systems on self-hosted LLMs.

email github ↗ telegram ↗ Download CV ↓

Kazakhstan · open to remote worldwide

scroll ↓

01 / about

Who I am

AI/LLM and fullstack engineer. I build LLM-powered systems — including document-analysis platforms — with self-hosted inference and RAG that run fully on-prem, no external APIs. I own the full stack: Python backends, React frontends, and the retrieval, structured output, and evaluation in between.

Six years in mobile (Flutter) before that — usually the sole developer on a project, across crypto/Web3, healthtech, iGaming, and nonprofit.

02 / experience

Where I've worked

  1. Haiku now

    AI/LLM & Fullstack Engineer

    Full-time May 2026 — Present

    Building an on-prem document-intelligence platform — LLM pipelines plus the fullstack web app around them.

    • ▹ LLM/RAG pipeline: self-hosted models via vLLM, retrieval over a vector DB, structured output, and tracing/evaluation — fully on-prem, no external APIs.
    • ▹ Fullstack app around the pipeline — a FastAPI backend (REST + WebSocket) that orchestrates long-running document jobs via Celery/Redis with PostgreSQL for state, and a React + TypeScript UI for review and reporting.
    • ▹ Document processing: PDF/DOCX parsing, OCR, report generation.

  2. Helpster Charity now

    Senior Mobile & Web Engineer

    Part-time Aug 2025 — Present

    Mobile app and a new marketing site for a charity product.

    Mobile (Flutter)

    • ▹ Rebuilt a stalled legacy app into a maintainable MVVM Clean codebase — new design, reworked business logic and API integration.
    • ▹ Google/Apple SSO, secure storage, and ongoing feature development.

    Flutter, MVVM Clean Architecture, get_it, injectable, auto_route, dio, freezed

    Web (marketing site)

    • ▹ Built from scratch — Astro (hybrid SSR/static), React, TypeScript, and Tailwind, with a headless CMS (Directus) and an interactive map (MapLibre).

  3. Denexy

    Senior Flutter Developer

    Contract Dec 2025 — Apr 2026
    • ▹ Rebuilt the LogExpert app from the ground up — new architecture, aligned to updated design specs, reworked API integration.

    Flutter, MVVM Clean Architecture, flutter_map, drift, get_it, injectable, auto_route, dio, freezed

  4. NDA Projects — iGaming

    Senior Flutter Developer

    Contract Jun 2025 — Jan 2026
    • ▹ Developed a Flutter app wrapping a client's existing web app via WebView.
    • ▹ Implemented onboarding, Google/Apple SSO, and bidirectional Flutter↔WebApp communication.
    • ▹ Built several small Flutter apps with rich analytics instrumentation (Facebook, Amplitude).

    Flutter, MVVM Clean Architecture, flutter_webview, Google/Apple SSO

  5. MentalGrowth

    Senior Flutter Developer

    Full-time May 2023 — Mar 2025
    • ▹ Sole Flutter developer across three products simultaneously.
    • ▹ Aspectica: designed architecture from scratch, complex animated UI, Adapty subscriptions, Sentry + custom analytics, audio playback.
    • ▹ Mimika: built a backend service from scratch (NestJS + PostgreSQL + Docker) — full-text search (Postgres tsvector), token-based auth, file uploads.
    • ▹ Youth: migrated an existing iOS app to Flutter, designed architecture, UI and API integration.

  6. Broxus

    Senior Flutter Developer

    Full-time Dec 2021 — Oct 2022
    • ▹ Continued development of EVER Wallet (TON blockchain crypto wallet).
    • ▹ Maintained and extended nekoton-flutter — open-source Rust FFI bindings for the nekoton crypto SDK; improved Dart↔Rust memory management.
    • ▹ Extended the Web3 in-app browser and delivered new wallet features.

  7. Progressive Mobile

    Senior Flutter Developer / Team Lead

    Full-time Sep 2020 — Dec 2021
    • ▹ Joined as Middle, promoted to Senior and appointed Team Lead within 6 months.
    • ▹ Migrated a React Native + Redux app to Flutter + BLoC; built native AR plugins from scratch (ARCore + OpenCV on Android, ARKit + Vision on iOS).
    • ▹ Integrated a Rust crypto SDK via Dart FFI; built account creation, transaction flows, and the Web3 browser for EVER Wallet.
    • ▹ Mentored junior developers and handled task distribution.

03 / skills

Stack

AI / LLM

Large Language Models (LLM)RAGLangChainvLLMPrompt EngineeringVector DatabasesLangfuseDocument AI / OCR

Backend

PythonFastAPISQLAlchemyPostgreSQLCeleryRedisNode.jsNestJSRESTWebSocketDocker

Frontend

ReactTypeScriptJavaScriptAstroTailwind CSSVite

Mobile

FlutterDartSwiftKotlin

Systems & Tooling

RustpytestCI/CDSQLGraphQL

Languages

EnglishRussian

04 / projects

Built in the open

A few things I've shipped and open-sourced — outside the AI work, which lives under NDA.

openm74

Python  ↗

Read and write the internal flash of an Itelma M74 CAN engine ECU (Infineon XC2765X) over K-line, on the bench — cross-platform, no vendor DLLs, no dongle. Byte-exact verified on hardware.

#Reverse Engineering#K-line / CAN#Embedded

kitewrt

Python  ↗

Self-hosted web UI on an OpenWrt router that turns a VLESS subscription into a transparent, whole-LAN VPN — pick a country, flip a switch. A generic management UI for sing-box.

#OpenWrt#sing-box#Networking

mvvm_lite

Dart  ↗

A tiny, zero-dependency MVVM toolkit for Flutter: a ViewModel base, a lifecycle-owning scoped provider, and Consumer/Selector widgets — a few hundred lines, Flutter-SDK-only. Published on pub.dev.

#Flutter#Architecture

05 / education

Education

06 / contact

Let's talk

Open to remote roles across AI/LLM, backend, and fullstack — feel free to reach out.

v.o.ledyaev@gmail.com github ↗ telegram ↗ Download CV ↓

●  Open to full-time, contract, and part-time — remote.