How to Build an App Like Robinhood

Account opening is the first experience and the most regulated step. In every jurisdiction, trading platforms must verify the identity of their users before allowing them to deposit funds or place trades. This is Know Your Customer (KYC) compliance. In most jurisdictions it also includes Anti-Money Laundering (AML) checks -- screening users against sanctions lists and politically exposed person databases.

KYC can be completed programmatically using identity verification services that accept a photo of a government ID and a selfie and return a verification decision in seconds. Services like Jumio, Onfido, and Stripe Identity all provide this capability via API. The integration adds cost but eliminates the need for manual document review at scale.

The account opening flow needs to collect the required disclosures and risk acknowledgments alongside KYC verification. Retail investors in most jurisdictions are required to confirm their understanding of investment risk before being permitted to trade. These disclosures must be presented clearly, not buried in fine print.

Real-time price data is the technical foundation of a trading app. Users need to see the current price of assets they own and assets they are considering buying. Price data must be fast, accurate, and available at all times during market hours.

Exchange-grade real-time data feeds are expensive. For a new platform with limited users, a delayed feed (typically 15 minutes behind real time) is significantly cheaper and sufficient for users who are making investment decisions on a day or week timescale rather than second to second. As your platform grows and user expectations increase, you can upgrade to real-time data.

For crypto assets, real-time price data is more accessible -- multiple exchanges provide websocket price feeds that can be consumed directly. For equities on regulated exchanges, you will need to license data from the exchange or from a data vendor like Polygon.io, IEX Cloud, or similar.

The portfolio view is what users look at most often. They want to see the value of their holdings, how much they have made or lost, and how their performance compares to a benchmark. The design needs to communicate this clearly at a glance.

Performance visualization matters. A simple line chart showing portfolio value over time is more useful to a retail investor than a table of positions. Interactive charts that let users zoom into a specific period -- today, this week, this month, this year -- give users the context they need to evaluate their performance.

Tax reporting is a related requirement that is often underbuilt in early versions. Users who have made gains or losses need to download their transaction history in a format that their accountant can use. The more detailed and accurate this reporting, the higher the trust users place in the platform.

The trading interface is where users place buy and sell orders. For retail investors, market orders (buy or sell at the current price) are the most common transaction type. Limit orders (buy or sell only at a specified price or better) are the second most important. Stop-loss orders and more sophisticated order types can be added in later phases.

Order confirmation and trade confirmation notifications are critical. A user who places a buy order needs to know immediately that it has been received, and then again when it has been executed with the actual price. Any delay or ambiguity in order confirmation erodes trust.

Order routing -- the path from a user placing an order to the order being executed on an exchange or by a market maker -- is the most technically complex part of a trading platform. For most niche platforms, this is handled through a brokerage infrastructure provider or an execution broker who handles routing in exchange for a spread or per-trade fee.

Users need to deposit funds to their trading account and withdraw proceeds to their bank account. Deposit mechanisms vary by jurisdiction: ACH bank transfer in the US, SEPA or faster payments in Europe, UPI or NEFT in India. The deposit integration needs to be matched to your target market's payment infrastructure.

Deposit time expectations matter. If a user deposits funds and cannot trade for 3 business days while the funds clear, that is a friction point that reduces activation. Instant deposit mechanisms -- where the platform advances funds against a pending deposit -- improve activation at the cost of credit risk on the platform. Robinhood and others offer instant deposits as a premium feature.

Withdrawals need to be processed reliably and within the timeframe stated in your terms. A user who cannot withdraw their funds when they want to will not trust the platform. The withdrawal flow needs to include identity re-verification for large withdrawals or withdrawals to new bank accounts as a fraud prevention measure.

Fractional shares allow users to buy a portion of a single share rather than a whole share. For high-price assets -- shares of companies that trade at hundreds or thousands of dollars each -- fractional shares make the asset accessible to users with small accounts. Robinhood's fractional share feature is a significant driver of engagement among users with small balances.

Fractional share arithmetic requires careful backend accounting. You are tracking ownership of a fraction of a share, which means your records need more decimal precision than whole-share systems. The accounting must remain correct through corporate actions like stock splits and dividend payments.

Educational content -- short explanations of what a stock is, how a limit order works, what diversification means -- improves confidence and engagement among new investors. This is particularly important for platforms targeting users who are new to investing. Content can be embedded in the product at relevant moments rather than published in a separate help centre.

We build the account opening flow with KYC/AML integration, risk disclosure collection, and account setup for your target jurisdiction. We integrate with identity verification APIs that handle document verification and sanctions screening programmatically.

Compliance requirements vary significantly by jurisdiction and asset class. During discovery, we work with your legal counsel to understand the specific requirements for your market and ensure the account opening flow meets them from day one.

We build the trading interface -- asset search, price display, buy and sell flows, order confirmation, and trade history. Order types at launch are typically market and limit orders, with additional order types added in later phases.

Order routing is handled through your brokerage infrastructure provider or execution broker. We build the integration between the user-facing order flow and the order management system your broker provides. The integration must be low-latency and resilient -- order failures that are not communicated clearly to the user are a serious trust problem.

We build the portfolio view with holding values, performance charts, and historical data. Market data is integrated from your chosen data provider -- we have experience with Polygon.io, IEX Cloud, and exchange-direct feeds.

Charts are interactive, filterable by time period, and benchmarkable against indices. The portfolio view is designed to be the first screen users open when they want to check on their investments -- simple, fast, and clear.

We build the deposit and withdrawal flows integrated with your target market's payment infrastructure. ACH, SEPA, faster payments, UPI -- we match the integration to your jurisdiction. Deposit confirmation, fund availability notifications, and withdrawal processing status are all communicated to users in real time.

For platforms that want to offer instant deposits, we build the instant deposit mechanism with the appropriate credit risk controls. Instant deposit limits, eligibility criteria, and recovery processes for failed deposits are all configurable in the admin panel.

We build the admin panel with user management, KYC status review, transaction monitoring alerts, suspicious activity reporting workflows, and audit trail export. Regulatory reporting requirements -- trade reporting, transaction reporting, customer data exports for regulatory requests -- are built into the admin toolset.

The compliance toolset is not just a nice-to-have: it is what your compliance officer will use daily. We build it as a first-class interface, not an afterthought.