Mircea Ene
Verified Expert in Engineering
Software Developer
Bucharest, Romania
Toptal member since October 4, 2021
Mircea is an AI Engineer building voice-first, LLM-driven products end-to-end. He architects multi-agent systems with Pydantic AI, AutoGen, LangGraph, and LangChain, fine-tunes Mistral models, and builds LLM-as-a-judge evaluation pipelines across GPT, Claude, Mistral, and Grok. He's shipped real-time voice pipelines with Deepgram and Whisper, and cut server load by 75% through smart caching. Mircea has four years of C++ systems development work at Electronic Arts and a $10,000 ElevenLabs grant.
Portfolio
Experience
- Debugging - 5 years
- C++ - 5 years
- Python - 4 years
- Windows - 4 years
- JavaScript - 3 years
- C# - 3 years
- Node.js - 3 years
- MongoDB - 2 years
Preferred Environment
Windows, Visual Studio Code (VS Code), C++, Node.js, JavaScript, MongoDB, MySQL, OpenGL, TypeScript 5, MacOS
The most amazing...
...experience I’ve had is joining a startup with eight people, all from different countries, as a back-end developer and launching a mobile game in six months.
Work Experience
AI Consultant
Augmented Data Management Solutions Inc.
- Migrated the voice pipeline from ElevenLabs to Amazon Connect, consolidating Twilio + ElevenLabs into one AWS-native stack, unlocking HIPAA infrastructure, human-agent escalation, and Contact Lens analytics — at the cost of slightly less natural TTS.
- Shipped a modular React and Vite platform serving four role-scoped portals plus a marketing site from one app, using lazy-loaded route sections for independent bundles and isolated auth contexts to enforce role-based access against a shared library.
- Built a real-time tool-call pipeline for an LLM voice agent with a pre-result hook that rebuilds and pushes the system prompt to the model between a tool's execution and its result delivery, keeping context coherent across mid-call state mutations.
- Engineered a distributed booking-concurrency model using per-time-bucket write locks inside MongoDB transactions. Overlapping bookings serialize and retry on fresh snapshots while non-overlapping ones commit in parallel, preventing double-booking.
- Architected a multi-tenant telephony SaaS that routes inbound calls by dialed number through a cached tenant resolver, enforces subscription state at the TwiML layer, and isolates per-tenant phone numbers, voice config, and SMTP under shared infra.
- Designed a pluggable voice-agent abstraction unifying ElevenLabs and Deepgram behind one interface, normalizing wire formats, tool protocols, and transcript events so the active provider hot-swaps per tenant or per call from config alone.
Founding Engineer
Considr Inc.
- Architected a Node.js server that handles thousands of concurrent web sockets transferring real-time audio data from browser clients.
- Architected an agentic framework using Pydantic AI and a voice agent using Deepgram.
- Structured and pruned big data that was used to fine-tune a custom LLM model based on Mistral-7B using data gathered from users.
- Configured a MERN stack application on GCP using features like Cloud Run, VPN, buckets (storage), and authentication.
- Took features from brainstorming ideas and made them fully functional.
- Integrated several APIs from providers like GPT, Stability.AI, ElevenLabs, Stripe, and Deepgram.
Senior Software Engineer
Latch
- Developed back-end features using Java, Spring Boot, and Play Framework to communicate with embedded devices via FlatBuffers.
- Tracked and fixed bugs using Jira as a reporting tool.
- Developed scripts to automate certain time-consuming activities and generate code for the FlatBuffers integration with Java.
Senior Software Engineer
Aptiv
- Implemented a CI/CD pipeline for a couple of projects that were missing it entirely and added VectorCAST as a unit test framework to the projects.
- Investigated and identified problems in various project development processes using different build tools like CMake, Make, Bazel, and MSBuild. Used various compilers like TASKING, IAR, Microsoft Visual Studio, GCC, MinGW, and GNU.
- Developed a framework using Docker, JFrog Artifactory, and Jenkins to allow teams to export their environment as a Docker image later deployed on different AWS and GCP machines.
Software Engineer
Electronic Arts
- Developed a variation of the Hungarian algorithm to replace a greedy algorithm.
- Created a C# tool for merging glyphs from different fonts into a new font. This was useful in scenarios where various languages are used, and complications might appear when two glyphs from two different languages share the identical Unicode.
- Developed a C# tool using the Selenium framework that would complete the end-to-end process of downloading, updating, and generating C++ code and uploading configuration files to web apps that wouldn't support REST. This also included authentication.
- Developed a C# tool that would replace manually updating XML files for configuring Flash and ActionScript menu UIs with a visual UI that would later convert to XML.
- Delivered a context-switch-prone environment helping other teams reach their deadlines.
Software Engineer
Freelance
- Developed a scalable C# application based on the Selenium framework that would automatically complete the end-to-end process of purchasing tickets from a website using proxies and captchas, as well as solving features and API rate limit avoidance.
- Implemented a socket communication module between C# on the front end and Java on the back end.
- Created and trained a machine learning model in Python, using mainly NumPy and Pandas modules for solving image matching captchas.
- Developed a web-based dashboard for controlling hundreds of instances running on Windows Server 2012 machines.
- Implemented notifications for events like "ticket found" and "ticket purchased" and errors, using the Twilio SMS framework.
Software Engineer
Simultec
- Developed an OpenGL application to render a 3D map based on 2D cartographic images and Elevation API from Google.
- Crafted a 2D OpenGL UI that would replicate an airplane's cockpit based on images cropped by me in CorelDRAW of the actual cockpit instruments.
- Developed a C++ cloud-like console application using sockets that would allow clients to download and upload files to the server.
- Created a module for importing Blender models into OpenGL.
Experience
Hollywood Trivia Game
The difficulty of a puzzle is dynamically calculated based on a machine learning model trained using user feedback and movie preferences. For generating puzzles, I chose to go with C++ worker threads spawned by Node.js V8 engine. This solution was based on having all the data structures already written in JavaScript. For unit, integration, and E2E tests I used Jest, a testing framework available as a Node.js package. The servers are run on Linux machines hosted on GCP.
Dashboard for Sensor Statistics
Using the Stripe payment module, I implemented a payment feature. Also, I implemented an admin role and user management.
Founding Engineer
https://app.vnote.aiFootbal World Cup 2026 Predictions
https://mondy.footballEducation
Bachelor's Degree in Systems Engineering
Politehnica University of Bucharest - Bucharest, Romania
Skills
Libraries/APIs
Node.js, REST APIs, React, OpenAI API, Claude API, Stripe, Socket.IO, Auth0 API, Auth0 Management API v2, Pydantic, Stripe Connect, OpenGL, Stripe API, FlatBuffers, Protobuf
Tools
Claude, ChatGPT, MongoDB Atlas, AI Prompts, GitHub, Expo, SendGrid, Google Analytics, n8n, Figma, Claude Code, CorelDRAW, Jenkins, CMake, Make (formerly Integromat), Apache, MinGW, Microsoft Visual Studio, Auth0, Amazon Connect
Languages
C++, JavaScript, Python, Java, XML, TypeScript, Python Script, C#, C++17, GraphQL, SQL, HTML5, PHP 7, Java 8, HTML, CSS, TypeScript 5
Frameworks
Express.js, React Native, JSON Web Tokens (JWT), LangGraph, NestJS, OAuth 2, Spring, .NET, .NET Core, Next.js, Agentic Frameworks, Selenium, Ant Design, Spring Boot, gRPC, Play Framework, Django
Paradigms
REST, API Architecture, Asynchronous Programming, Back-end Architecture, Microservices, Serverless Architecture, Model Context Protocol (MCP), UI Design, DevOps
Platforms
Amazon Web Services (AWS), Vercel, Windows, Visual Studio Code (VS Code), AWS Lambda, Azure, iOS, Google Cloud Platform (GCP), Docker, Linux, MacOS, Kubernetes, Android, Twilio
Storage
JSON, PostgreSQL, Databases, MongoDB, Redis, Amazon S3 (AWS S3), MySQL, Redis Cache, Microsoft SQL Server
Industry Expertise
Healthcare
Other
Debugging, API Integration, APIs, Architecture, Back-end, Back-end Development, Data Scraping, Speech-to-Text (STT), Full-stack, Prompt Engineering, API Design, API Testing, OpenAI GPT-3 API, OpenAI GPT-4 API, Large Language Models (LLMs), Artificial Intelligence (AI), AI Agents, Startups, OpenAI, Webhooks, Full-stack Development, AI Integration, Agentic AI, LangChain, Scripting, Coding, Minimum Viable Product (MVP), SaaS, System Architecture, Anthropic, Software Architecture, Software Design, Generative Artificial Intelligence (GenAI), LLM Integration, Text-to-Speech (TTS), Optimization, Multithreading, Performance, WebSockets, CI/CD Pipelines, Cloud Architecture, Cloud Storage, FastAPI, Web Applications, Audio Recording, Web Development, Cloud Infrastructure, App Store, Stripe Terminal, User Interface (UI), Retrieval-augmented Generation (RAG), Agentic RAG Systems, AI Chatbots, Chatbots, Payments, Supabase, Scalability, RAG Systems, Push Notifications, Leadership, API Backwards Compatibility, SSH, AI Agent Orchestration, Systems Engineering, Networking, Machine Learning, JFrog, CloudBees, Sensor Data, GNU, Amazon RDS, Stripe Payments, ElevenLabs Solutions, Figma Make
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