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I’m Constantin Colac, a Berlin-based builder who enjoys turning messy ideas into reliable systems. I’ve been working since 2015 across IoT, proptech, web3, and trading—often bridging front-end, back-end, and data to ship real products. Most recently, I build real-time market data and trading systems in Rust for Solana, EVM chains, Hyperliquid, and Polymarket, and I also create supporting back-end services in Rust and Python. Along the way I’ve led engineering teams as CTO/CPO, built high-throughput streaming APIs, and shipped integrations across REST, gRPC, WebSockets, and webhooks—always with a strong focus on performance, correctness, and maintainable engineering.…I’m Constantin Colac, a Berlin-based builder who enjoys turning messy ideas into reliable systems. I’ve been working since 2015 across IoT, proptech, web3, and trading—often bridging front-end, back-end, and data to ship real products. Most recently, I build real-time market data and trading systems in Rust for Solana, EVM chains, Hyperliquid, and Polymarket, and I also create supporting back-end services in Rust and Python. Along the way I’ve led engineering teams as CTO/CPO, built high-throughput streaming APIs, and shipped integrations across REST, gRPC, WebSockets, and webhooks—always with a strong focus on performance, correctness, and maintainable engineering.

Constantin Colac

Back-End Developer, Front-End Developer, Blockchain Developer, +2

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I’m Constantin Colac, a Berlin-based builder who enjoys turning messy ideas into reliable systems. I’ve been working since 2015 across IoT, proptech, web3, and trading—often bridging front-end, back-end, and data to ship real products. Most recently, I build real-time market data and trading systems in Rust for Solana, EVM chains, Hyperliquid, and Polymarket, and I also create supporting back-end services in Rust and Python. Along the way I’ve led engineering teams as CTO/CPO, built high-throughput streaming APIs, and shipped integrations across REST, gRPC, WebSockets, and webhooks—always with a strong focus on performance, correctness, and maintainable engineering.…I’m Constantin Colac, a Berlin-based builder who enjoys turning messy ideas into reliable systems. I’ve been working since 2015 across IoT, proptech, web3, and trading—often bridging front-end, back-end, and data to ship real products. Most recently, I build real-time market data and trading systems in Rust for Solana, EVM chains, Hyperliquid, and Polymarket, and I also create supporting back-end services in Rust and Python. Along the way I’ve led engineering teams as CTO/CPO, built high-throughput streaming APIs, and shipped integrations across REST, gRPC, WebSockets, and webhooks—always with a strong focus on performance, correctness, and maintainable engineering.

Available to hire

I’m Constantin Colac, a Berlin-based builder who enjoys turning messy ideas into reliable systems. I’ve been working since 2015 across IoT, proptech, web3, and trading—often bridging front-end, back-end, and data to ship real products.

Most recently, I build real-time market data and trading systems in Rust for Solana, EVM chains, Hyperliquid, and Polymarket, and I also create supporting back-end services in Rust and Python. Along the way I’ve led engineering teams as CTO/CPO, built high-throughput streaming APIs, and shipped integrations across REST, gRPC, WebSockets, and webhooks—always with a strong focus on performance, correctness, and maintainable engineering.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Romanian, Moldavian, Moldovan

Fluent

English

Advanced

Russian

Intermediate

German

Beginner

Work Experience

Co-Founder and Engineer at Sideguide (sideguide.app)

July 1, 2026 - Present

Built and maintained a Chrome extension for community owners at Skoole sessions. Designed a crash-safe sending queue that never holds the owner’s login, reverse-engineered private Skoole chat behavior, and integrated with Skoole’s notification APIs to mirror owners’ notifications inside their boxes. Focused on robustness and secure interaction with community workflows while delivering a useful end-user experience.

Co-Founder and Engineer at Remote Jule (maketh em call.)

July 1, 2026 - Present

Co-founded and engineered AI/automation products and infrastructure for a meta advertising agency serving UK accounting firms. Built applications that integrate multiple external marketing-related APIs, including Meta Marketing API and WhatsApp Cloud API, and developed a site builder workflow using headless Chrome to generate static sites from client URLs. Implemented an LLM pipeline that turns client websites into campaign briefs, focusing on reliable delivery and integration-driven product development.

System Engineering Manager at JLL

January 1, 2023 - January 1, 2025

Joined after JLL acquired Envio Systems and served in system engineering leadership. Managed and drove engineering efforts across systems and delivery, supporting the integration and scaling of capabilities.

Co-Founder at PopBlocks (web3 development studio)

January 1, 2020 - January 1, 2023

Co-founded a Web3 studio with a team of about 20 engineers. Built, wrote, and deployed Solidity smart contracts including ERC-20 tokens, ERC-721 NFTs, and multi-token contracts in Solidty. Delivered arbitrage trading bots across Ethereum, BSC, and Polygon, and successfully exited in 2023.

Founder and Back-End Engineer at 0xﬁre (0xﬁre.com)

January 1, 2020 - January 1, 2023

Co-founded and built market-data and trading bots for Solana, Ethereum, Hyperliquid, and Polymarket. Wrote a Rust pipeline that decodes trades from Solana DEX programs (including Raydium, PumpFun, and Meteora) and stores them in PostgreSQL and ClickHouse. Operated a streaming API on a dedicated server, delivering multi-terabyte/day throughput with low latency and high uptime. Built and sold an API for six markets with an open-source TypeScript SDK, and implemented order-book recording and replay to backtest trading strategies. Developed Rust trading bots with custom backtesters and scam token filters.

Founder, Front-End Developer, CTO, and CPO at Envio Systems (Berlin)

July 1, 2017 - December 31, 2021

Founding team member starting as a front-end developer, then moved through CTO to CPO roles while building automation software that reduced energy usage in commercial buildings. Led front-end, back-end, and data science teams (about 5–8 people each), drove system and product direction, and coordinated execution across engineering and product. Exited when JLL acquired the company in July 2022.

Co-Founder and CTO at Faraday Motion (open-source electric vehicles)

July 1, 2015 - March 1, 2018

Co-founded and developed open-source electric vehicle projects starting with a 3D-printable electric skateboard. Built the vehicle platform, including ESP8266 firmware in C++, and shipped a mobile app to support the platform.

Back-End Developer at Petz & Co

January 1, 2015 - January 1, 2016

Back-end development early in career; contributed to backend systems and engineering work.