# App development in Chicago, IL > Derivatives and futures trading on LaSalle Street and Wacker Drive, heavy manufacturing across the south suburbs and northwest Indiana, and the rail and intermodal yards around Joliet that connect both to everywhere else. If your company sits where regulated finance meets physical logistics, and in Chicago many do, every automated action has a clock and a counterparty. Canonical: https://www.techfabric.com/app-development-chicago Serving: Chicago, Naperville, Evanston, Schaumburg, Milwaukee, Rockford Headquarters: 1530 E Williams Field Rd, Ste 201, Gilbert, AZ 85295. No office in Chicago. --- ## Why Chicago work is our work You've got a launch date and an MVP that falls over once real users and orders hit it. One senior team designs and builds the app and its backend, so the version you launch is the one that scales. Chicago apps often meet freight and finance at once, a dispatch tool for a carrier out of the Elwood intermodal yards or a trading screen in the Loop, and a restaurant group needs the same care. ## Work a buyer here would recognise If your orders, customers and invoices live in separate systems that have to agree, this is the study to read. AmTab's orders reach Business Central from the store without anyone re-keying them, and Power Automate keeps the store, the CRM and the ERP holding the same records. ## Every trade has to reconcile In Chicago, CME Group runs its futures exchanges from Wacker Drive, Cboe sits a few blocks away on Van Buren, and the trading firms around the old Board of Trade building on LaSalle reconcile every day. CFTC Rule 1.31 keeps their records for five years, and SEC Rule 17a-4 holds broker-dealers to the same discipline, so a position that can't be rebuilt from its history is a finding. ## Questions ### Can the event log serve as our reconciliation source? That is what it is for. The event log is authoritative and read models derive from it, so a projection can be rebuilt by replay rather than reconciled by hand. In a business where reconciliation is a daily function that is the difference between an hour and a week. ### Do you have an office in Chicago? The office is in Gilbert, Arizona, with teams in Amsterdam, Dnipro and Hyderabad. Delivery is remote or hybrid, and we travel for discovery, workshops and the opening weeks of a build. ## What app development covers ### iOS and Android A shared codebase where it suits the product and native where it does not. It is a per-product decision rather than a house position, and anyone who answers it before hearing what the app does is telling you about themselves. ### Web apps The browser half of the same product, built to be changed safely years after the original team has moved on. Tests that mean something, seams where the business logic can move, a deployment nobody is afraid of. ### The backend and API Built with the app rather than found afterwards. Where you already have an API we will work with it and say plainly if it is the reason the app will feel slow. ### Offline behaviour and sync Decided deliberately at the start. A field app that has to work in a warehouse with no signal is a different design from one that assumes a connection, and retrofitting the difference means rewriting the data layer. ### Release and store submission Staged rollout so a bad build reaches a few hundred people rather than everyone, and the App Store and Play Store process including the rejections, which arrive for reasons that have nothing to do with code quality. ### Keeping it alive Two OS releases a year, certificates that expire while somebody is on holiday, and store policies that change. We stay on a maintenance footing or hand over with the provisioning and the release process written down. ## Working with us from Arizona Arizona does not observe daylight saving, so we are one hour behind you from November to March and two hours behind from March to November. A morning standup on your clock is still early afternoon on ours. Most delivery is remote or hybrid. We travel for discovery, workshops and the opening weeks of a build.