2021
TraderFyles
IRS-Ready Tax Forms, Generated Automatically From Every Trade
Our roleProduct development: product management, product discovery, backend and frontend development, infrastructure
TraderFyles is a platform purpose-built for active trader tax filing - taking a trader's full transaction history across brokers and exchanges and producing accurate, IRS-ready tax forms automatically. LambdaWorks ran the product discovery, validated the concept, and built the scalable platform.
The problem generic software doesn't solve
Hundreds of taxable eventsActive traders generate hundreds or thousands of taxable events a year. Each has implications for wash sale rules, short vs. long-term gains, cost basis tracking, and form-specific reporting.
No purpose-built softwareThe options before TraderFyles: hire a specialized CPA at significant cost, or spend weeks manually reconciling trades with high error risk. No software filled the gap.
Starting with discovery
LambdaWorks ran product discovery workshops before writing production code. The process pressure-tested the concept: was the problem real, was the market addressable, and what was the minimum viable product?
The proof of concept confirmed demand. The team moved to building a scalable platform.
What we built
Wash sale management - Automatic identification and adjustment across all connected accounts.
Capital gains calculation - Short and long-term classification, accurate cost basis tracking.
Trade reconciliation - Imports and normalizes data across brokers and exchanges.
IRS form generation - Ready-to-file documentation. No manual data entry at the end of the process.
Built to scale
The platform handles large transaction volumes without performance degradation. Architecture designed for ongoing product growth: new brokers, new asset classes, and evolving tax rules can be added without rebuilding core systems. LambdaWorks provided continued team support through post-launch iteration.