Senior Full Stack Developer - Tradesyncer (Nl) (Saas Platform) - €5.500 - €7.000 A Month in The Hague

*Full Stack Developer.* Zorg ervoor dat u de volledige omschrijving hieronder leest en solliciteer direct als u ervan overtuigd bent dat u aan alle eisen voldoet. Tradesyncer (NL) Amsterdam, on-site preferred, hybrid possible Full-time Salary: *€5500 to* *€7000* per month Start: as soon as possible Be the builder behind our trading platform — and the interfaces traders actually touch. From backend logic to responsive frontend, owned end to end. *About Tradesyncer* Tradesyncer is the fastest growing platform futures traders use to scale and improve their trading. Trade copying across unlimited evaluation and funded accounts in under 100 ms, plus a trading journal, analytics, expense tracking and risk management, all in one cloud-based place. No installs. We operate 24/7 and integrate with the world's leading futures brokers (NinjaTrader, Tradovate, Rithmic, TradingView, and more) across every major prop firm our traders are evaluated and funded by. We're a small, fast-moving team building infrastructure that serious futures traders depend on every day. Now we're looking for a Full Stack Developer t to help us scale what we've built and take it to the next level. *The Role* As a Full Stack Developer, you'll work across the stack — designing and building *API endpoints* on the backend and bringing them to life as the *React interfaces* traders use every session. You'll own features end to end and ship work that thousands of traders rely on daily. *This role is for someone* who likes owning a feature from data model to interface, keeps their code clean and well-documented, and moves fast with AI tooling in a scale-up environment. *The platform you'll scale* Tradesyncer gives futures traders the full infrastructure to scale and improve, not just one tool. You'll own how trade copying, journaling, analytics, expense tracking and risk management fit together, and how it all plugs into the brokers and prop firms traders run on. One platform, everything traders need to scale: trade copying, trading journal, analytics, risk management, expense tracking, propfirm tracker, AI coach. Brokers and platforms: NinjaTrader, Tradovate, Rithmic, TradingView, ProjectX, Deepchart, and more. *What you'll do* * *Design and build API endpoints* in TypeScript (Node) — clean, documented, and wired straight into the product.
* *Bring those endpoints to the front end* as fast, responsive React / TypeScript interfaces traders rely on every session.
* *Own features end to end* — data model → endpoint → frontend → the last 10% of polish that makes it feel right.
* *Build real-time flows* over WebSockets so dashboards and