Ivan Mijatović

Senior Software Engineer and co-founder of Bookaweb & Infinity

Over the past 15 years, I've built production systems used by thousands of companies and millions of users worldwide, including SaaS platforms, trading infrastructure, and large-scale backend systems.

15+ years experience 20,000+ companies use my software Co-founder
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Ivan Mijatovic portrait
TRUSTED BY
Sotheby's International Realty Comtrade Coca-Cola HBC Infinity Bookaweb PropBooster

Selected Work

Selected Work

Three projects I’ve built end-to-end — engineered for reliability, determinism, and scale.

TRADING SYSTEM

Software Architect & Core Engineer · Automated trading system

Polymarket Twin Engine

Deterministic trading infrastructure for prediction markets

Deterministic execution · Backtesting engine · Live trading infrastructure · Event-driven architecture

I design & built a deterministic trading and backtesting platform where live trading and simulations run the exact same strategy and execution logic, ensuring directly comparable and reliable results.

It includes full infrastructure: real-time data ingestion, order book reconstruction, execution engine, order management, portfolio accounting, and research tooling for strategy development.

Impact

  • First ever backtesting system for Polymarket
  • Backtest/live 99.6% parity: identical strategy + execution logic on the same tick stream
  • Processes +200M market events/day through a real-time pipeline (P95 sub-100ms)

My Role

  • Architected the execution pipeline and deterministic replay model
  • Built ingestion + storage + replay engine (raw events → storage → reconstruction)
  • Implemented order management, risk limits, and portfolio/PnL accounting
Read "Polymarket Twin Engine" case study →
TRAVEL MARKETPLACE

Founder • Travel marketplace platform • 2023–present

Bookaweb

Travel marketplace platform integrating hotels, flights, and experiences at scale

Booking orchestration • Availability synchronization • Search infrastructure • Production systems

Bookaweb is a travel marketplace platform integrating millions of hotels, tours, and flight options through large-scale external provider integrations.

I designed and built the core booking infrastructure, including availability synchronization, calendar management, pricing logic, and transactional booking workflows, ensuring consistency and reliability in real production environments.

Impact

  • Integrated millions of travel listings from external providers
  • Built complete booking orchestration system handling availability, pricing, and reservations
  • Designed calendar synchronization and conflict-resolution logic
  • Implemented scalable search and filtering across large datasets
  • Built production systems handling real user bookings and transactions

My role

  • Designed backend architecture and booking system from scratch
  • Built booking workflows, calendar logic, and pricing infrastructure
  • Implemented partner integrations and large-scale data ingestion pipelines
  • Optimized database performance and search indexing
  • Owned production infrastructure and system reliability
Read "Bookaweb" case study →
SAAS PLATFORM

Co-founder • SaaS platform • 2018–2023

Infinity

Work Management SaaS platform used by 20,000+ companies worldwide

Multi-tenant SaaS • Scalable backend architecture • Real production workloads

Infinity is a work management platform that helps teams organize projects, workflows, and internal operations.

I co-founded Infinity and designed core backend systems, APIs, and infrastructure supporting production workloads globally.

Impact

  • Used by 20,000+ companies worldwide
  • Built scalable multi-tenant SaaS platform from scratch
  • Powered real production workloads globally

My role

  • Designed backend architecture and APIs
  • Built core platform systems and infrastructure
  • Worked across backend, frontend, and system architecture
Read "Infinity" case study →

Core Technologies

“I build production infrastructure, trading systems, and scalable web services — optimized for reliability and determinism.”

Languages

  • TypeScript
  • JavaScript
  • PHP
  • SQL

Backend & APIs

  • Node.js
  • Laravel
  • REST APIs
  • Webhooks
  • Idempotency
  • Retry & Backoff

Queues & Background Jobs

  • Redis queues
  • Laravel Horizon
  • Workers
  • Scheduling
  • Async pipelines

Data & Storage

  • MySQL
  • Redis
  • Elasticsearch
  • Parquet

Infrastructure

  • Docker
  • Linux
  • Nginx
  • CI/CD
  • WebSockets
  • Event-driven

Trading Systems

  • Market data pipelines
  • Order book reconstruction
  • Execution engine
  • Backtesting engine
  • Deterministic execution
  • Portfolio accounting

AI & Agent Workflows

  • Codex
  • Claude Code
  • MCP
  • OpenClaw
  • ElizaOS
  • Tool-using agents
  • Automation workflows

Blockchain & Web3

  • Solidity
  • Trading bots
  • NFT collections
  • Ordinals
  • Website minters
  • Token launches (TGE)
  • Staking
  • DeFi integrations
  • Ethereum mini-game

Systems Engineering Focus

  • Distributed systems
  • Real-time processing
  • Scalable backend architecture
Available for Engineering Roles and Consulting

Let’s Build Production Systems That Scale

Backend systems, trading platforms, and scalable infrastructure
designed for reliability and long-term growth.

Get in Touch