Senior Full-Stack Engineer (Trading Platform)

Railsware • Ruby • Rust • TypeScript • JavaScript • 14 days ago
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Salary
≈ $65k – $100k per year (Estimated)
Location
Remote (Poland)
Seniority
Senior · 5+ years exp
Employment
Full-Time
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Railsware

Railsware is a product studio and software engineering company headquartered in Krakow, Poland, and founded in 2007. The company builds custom web and mobile products for clients while also developing its own tools, including the Mailtrap email testing platform, the Coupler.io data integration service, and Smart Checklist for Jira. It works mainly with startups and scale-ups in Europe and North America and is known for publishing its internal product management practices.
railsware.com • HQ: Kraków, Poland • IT Outsourcing • Productivity Software • IT Consulting • Web Development • Information Technology • Software • Est. 2007

You'll join us as a Senior Full-Stack Engineer, with your main focus on TradeZella, our trading journaling and educational platform. TradeZella syncs trade data from over 500 brokers and prop-firm platforms, runs backtesting against more than a decade of historical market data, and uses AI to automatically tag and analyze trading patterns for over 50,000 active traders.

We're currently considering an allocation across two products, so there's a chance you'll also spend some time working on a trading terminal, a platform for reviewing and replaying trades designed for prop firms and traders. It combines order flow visualization with replay, audit, and execution in one system. TradeZella will remain the main focus of this role.

What you'll get:

  • Ownership - you'll be involved in the full process: from specs to shipping. No ticket queue.

  • Product connection - you'll use the product yourself as a trader.

  • AI-first team - we use AI as part of how we plan, research, and build, not just as a helper tool.

  • Working style - outcome-driven. We combine synchronous collaboration with focused asynchronous work, choosing the approach that best supports effective outcomes.

Who we're looking for

A senior full-stack engineer who is also an active trader. This role requires both strong engineering skills and real trading experience. If you only code or only trade, this is probably not the right fit. We're looking for someone who is comfortable working across product, technology, and trading.

Requirements:

  • 5+ years of engineering experience

  • Comfortable across backend systems, including low-latency backend

  • Experience with modern frontend frameworks ( React 18+ / TypeScript)

  • Active trader: futures or crypto, day trading or scalping

  • Spec-driven, AI-orchestrated development: you plan deeply and know how to work with AI agents effectively

  • Experience with real-time market data: WebSocket streaming, order books, Level 2 depth

  • Ability to produce your own product specs

  • Ability to make UX decisions based on the UX guide and input from a UX advisor

  • Fluent English (written and spoken)

Would be a plus:

  • Ruby or Rust (we use Rust/Axum) experience

  • Experience with high-performance browser rendering (e.g. WebAssembly, ImGui, egui)

  • Familiarity with trading tools like footprint charts, DOM/ladder, heatmaps, market/volume profile, CVD

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