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Jacob – Solidity, Smart contracts, C#, experts in Lemon.io

Jacob

From Bulgaria (UTC+3)flag

Blockchain Engineer|Senior
Back-end Web Developer|Middle-to-senior

Jacob – Solidity, Smart contracts, C#

Jacob has nearly 20 years of experience in game development, DevOps, blockchain, and backend systems. His diverse technical background showcases his strong engineering skills and ability to navigate complex trade-offs. Jacob has a talent for clearly explaining ideas, and his curiosity about technology is evident in his enthusiasm for exploring AWS multipart uploads and presigned URLs.

8 years of commercial experience in
Administration
Art and creativity
Blockchain
Consulting services
Customer support
Cybersecurity
Entertainment
Gamedev
NFT
Productivity
AI software
NLP software
Web3
Gaming software
Main technologies
Solidity
5 years
Smart contracts
5 years
C#
5 years
Python
4 years
AWS
2 years
Blockchain
6 years
Additional skills
Microservices
React
JavaScript
Ethereum
Typescript
LangChain
web3.js
Ethers.js
Unity
LangGraph
NLP
Direct hire
Possible
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Experience Highlights

Senior Back-End developer
Mar 2025 - Jul 20254 months
Project Overview

This is a blockchain-based action-adventure game that combines elements of exploration, mining, and resource collection. The game emphasizes play-to-earn mechanics, allowing players to earn digital assets and collectibles that can be traded or used within the game.

The primary challenge of this project was designing for low latency, high throughput, and effective live operations.

Responsibilities:
  • Created the backend for a real-time Unity multiplayer title designed for low latency, high throughput, and smooth live-ops;
  • Engineered Python microservices and networking (sockets + REST) to cut client-server latency and improve sync under load;
  • Designed fault-tolerant service boundaries and deployment workflows to speed releases;
  • Integrated CI/CD with versioned rollouts to reduce release errors.
Project Tech stack:
Python
WebSocket
Unity
REST API
Microservices
Senior Back-End developer
Mar 2025 - Jul 20254 months
Project Overview

The project is a Web3 collectible card game in the DAR Open Network multiverse, featuring blockchain ownership and play-and-earn mechanics. Players explore procedurally generated environments, collect AI-generated NFT cards, build decks, and compete in tournaments for $D token prizes.

Responsibilities:
  • Created Python microservices and networking (sockets + REST) to reduce client-server latency and enhance synchronization under heavy load;
  • Designed fault-tolerant service boundaries and deployment workflows to speed releases;
  • Integrated CI/CD with versioned rollouts to reduce release errors.
Project Tech stack:
Python
Microservices
REST API
WebSocket
CI
CD
Unity
AI & Full-Stack Developer
Oct 2024 - Mar 20254 months
Project Overview

An AI-native platform for building interactive worlds, characters, and stories. Enables creators to craft dynamic NPCs and branching narratives using vector-database “knowledge bricks.” The primary audience consists of game developers and storytellers looking to create engaging experiences with AI.

Responsibilities:
  • Implemented Python NLP/agent pipeline with intent steering and persistent memory graphs;
  • Shipped a multi-format ingestion system (PDF/DOCX/CSV/JSON) enabling proprietary data onboarding;
  • Delivered production website and backend services for scale-out.
Project Tech stack:
Python
NLP
LangChain
LangGraph
API Gateway
AI
Senior Blockchain Engineer
Oct 2023 - Aug 20249 months
Project Overview

This governance protocol tool is designed to provide a customizable experience for projects based on EVM and Chromia. The goal is to offer a solution for Decentralized Autonomous Organizations (DAOs), DeFi platforms, NFT ecosystems, and other related entities. It enables projects to implement governance in a manner that best suits their needs, while overcoming the limitations of existing products.

Responsibilities:
  • Designed cross-chain voting and token-lock mechanics;
  • Integrated Token-lock mechanics;
  • Implemented validation and access-control refactor for security;
  • Led architecture review and security audits;
  • Consulted on NFT marketplace readiness (performance & security).
Project Tech stack:
Solidity
HardHat
Python
Blockchain Tech Lead
Aug 2022 - May 20241 year 9 months
Project Overview

The project was undertaken by a gaming studio known for its innovative approach to the industry, with a focus on cutting-edge technologies. The mission was to create immersive experiences that captivate players worldwide. A notable achievement is that the project won the Binance Launchpool Project of the Year award for "My Neighbor Alice.

Responsibilities:
  • Directed a team of 5 engineers to deliver an on-chain turn-based strategy engine for Unity;
  • Designed and audited Chromia↔EVM asset bridge;
  • Authored a reusable .NET API layer reducing Unity↔chain latency;
  • Established code review + audit workflows (↓35% bugs).
Project Tech stack:
Solidity
Unity3D
.NET
Ethereum

Languages

Swedish
Advanced
English
Advanced

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