All work
FINTECHUNDER NDA2025-present

Algorithmic trading with explainable AI signals

A platform for algorithmic trading: the signal engine combines rule-based technical analysis, news sentiment and fundamentals, shows why every recommendation was made, and validates itself through a matrix backtest and paper trading via a broker API.

AI CO-PILOTCO-PILOTWhere is the risk now?FETCH PRICESANALYZE
Client
Algorithmic-trading startup (Europe)
Engagement
Product development
Timeline
Early stage
Stack
.NET · Next.js · PostgreSQL
The challenge

Dozens of tickers, news and indicators, every day.

Trading a stock market by hand means tracking dozens of tickers, reading the news and weighing indicators, every single day. An early-stage fintech wanted a system that does this itself — and above all shows why it made each decision.

Our approach

Signals that show why they fired.

We built a .NET backend with realtime delivery and full telemetry — traces, metrics and logs — into its own observability stack. The signal engine combines rule-based technical analysis, language-model scoring of news sentiment and fundamentals into a morning recommendation with an audit trail of which indicators fired and how the model reasoned. On top of that: a matrix backtest across multiple tickers, paper trading through a broker API and a monitor comparing internal validation against real runs.

Signals from technical analysis, news sentiment and fundamentals
An audit trail: which indicators fired and how the model reasoned
Matrix backtest and paper trading through a broker API
Full telemetry and Playwright E2E tests
AGENTIC LOOPLLMOBSERVEREASONPROPOSELEARN
The outcome

A morning recommendation that explains itself.

Explainable
SIGNALS WITH AN AUDIT TRAIL
Backtest + paper
VALIDATED BEFORE GOING LIVE
Zero-downtime
DEPLOYS FROM THE RELEASE BRANCH
Evidenced outcome

The main application carries 729 commits in roughly 4.5 months — a working proof of concept spanning the signal engine to paper trading via a broker API.

More work

All work →

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