Senior Software Engineer BlockTech · Netherlands

# Senior Software EngineerBlockTech · Netherlands · Senior · OnsiteView & Apply## About BlockTechBlockTech is a fast-paced algorithmic trading firm facilitating global cryptocurrency derivatives and spot trading while expanding into new markets. As we continue to grow rapidly, we are looking for a Senior Software Engineer to take technical ownership of our Core systems and help shape how they evolve through our scale-up phase.This is a role for an engineer who has already built and operated correctness-critical systems at scale and who wants their technical decisions to set direction, not just follow it.## Key Responsibilities:You will own the systems that keep our trading operation accurate at every level — positions, PnL, instruments, hedging, and the data flowing between them. Across exchanges and asset classes, your work determines whether the numbers our traders and risk team rely on are correct. As a senior engineer, you will also set the technical standards the rest of the team builds against.You will:* Own the books. Maintain and evolve our position, trade, and PnL systems so they remain accurate across every venue.* Architect the platform that supports trading. Design services that handle real-time exchange flow with the throughput and reliability our quoting and hedging depend on, making the structural calls that keep them fast and correct under load.* Own the data flows. Operate and harden the public and private pipelines bringing market prices, account state, and trade events into our systems in real time.* Lead venue integrations end-to-end. Deliver exchange and prime-broker integrations across protocol, account model, settlement, reconciliation, and surveillance and define the patterns we reuse for the next one.* Model the instrument universe. Own the systems describing every tradable instrument - lifecycle, expiry, margin, RFQs, fast-path quoting - where both correctness and latency matter.* Build self-healing systems. Design the detection and repair flows that identify position discrepancies and correct them automatically.

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