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The Role
Your day-to-day work spans four key areas:
High-throughput optimisation
Every block, we process tens of thousands of transactions, each simulated hundreds to thousands of times through the VM when running different sorting algorithms trying to find the optimal transaction ordering in an NP-hard problem. Alongside the other blockchain problems like computing the full state merkle trie for each block. At this scale, saving even a single microsecond in frequently called code compounds across millions of calls.
Low-latency systems
Parts of our stack run end-to-end in low microseconds. Alongside the large sorting algorithms we have parts of our system that we keep ultra simple and low-latency. For example, when a bid update comes in from a relay, we need to calculate a bid response and forward it to the relay before competitors do. This is the kind of work where finding big improvements is hard and requires smaller, specific optimisations.
Competitive dynamics
Block building is an adversarial game. We compete against other builders every slot, watching how they sort transactions, how they adjust bids, what patterns emerge in their behaviour. A lot of the work here requires spending significant time analysing patterns, finding insights, and turning them into engineering or strategic changes that directly affect P&L.
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Innovation
The block building landscape is constantly evolving. Sorting algorithms and types of orderflow are changing. New ways for traders to access blockspace keep emerging. Protocol changes reshape the competitive surface. For example, for the Ethereum builder ePBS ships in the next hardfork, moving bid submission from direct connections to relays to (at least for a subset of blocks) the Ethereum p2p layer. Optimising here is an entirely different problem to optimising a direct TCP connection to a relay. This isn't a mature domain where you're only optimising at the margins. There's genuine room to define how things work, both within Gattaca and across the ecosystem.
You'd own systems end-to-end, from design through deployment through iteration. The code you write can be shipped to one of our builders within the hour and will directly affect market share and P&L.
Requirements
Specifics we’re looking for
- Strong systems programming in Rust, other low-level languages accepted with willingness to switch.
- Sharp problem-solving. The domain is adversarial and fast-moving. You'll need to reason through novel situations, spot patterns others miss, and think strategically.
- Deep understanding of how software interacts with hardware: CPU cache, memory layout, branch prediction, what the compiler actually emits. You've profiled, optimised, and know where time goes.
- High agency. You own things end-to-end: understand the system → analyse metrics → detect issues → fix them → deploy → iterate.
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Skills we value, but aren’t a requirement
- Understanding how the blockchain VMs work e.g., Ethereum Virtual Machine (EVM).
- Blockchain fundamentals, the transaction supply chain and Maximal Extractable Value (MEV).
- Networking optimisations: kernel networking stack, XDP, etc.
- Auction systems, game theory.
Compensation
- Top-of-market base salary plus a guaranteed minimum bonus.
- Bonus is uncapped and tied directly to company P&L. Strong performers have taken home over 100% of base.
- Equity on joining, with more earned through performance.
- Private healthcare.
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Jessica, London
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