Marissa

@marissaposner

662 Following

2453 Followers

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New year new role 🚨 I’ve joined @ethereum as part of the Account & Chain Abstraction Team! This new chapter is deeply connected to a goal I’ve held: to positively impact 1 billion people in my lifetime. To me, Ethereum is the perfect place to make that happen.

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7-12-2025 🧘🏼‍♀️ Taking a very chill weekend with some friends out east ✌🏼I’ve been going going going I needed some relaxation time. This pic is from my 1 hour socializing today and the rest of the time was spent in my Ethereum pants and MEV sweatshirt at home 🙈

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7-11-2025 ✡️ Has a nice Shabbat dinner at surf lodge tonight with friends 💖 also built sandcastles with the cutest little girl and that was the highlight. Sometimes I just want to be a kid again!

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paymasters are like rich aunts that cover your rent but only if you send a thank you card in cursive

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Obviously we HAVE to call it barcaster!!

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🎉 We just launched the new ERC-4337 documentation hub - a resource for building, understanding, and deploying account abstraction on Ethereum/L2s. 📖 👉 https://docs.erc4337.io/ Whether you’re: – Building wallets with custom validation – Shipping gasless UX with paymasters – Working on bundlers, alt mempools, etc – Or want to understand how ERC-4337 works This is the place.

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7-10-2025 🗽 Yankees win!! 6-5 in extra innings after being down 0-5 in the 8th inning. Pretty epic win and felt great to be in the big house.

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A system is only fully trustless if 1) all logic and enforcement are cryptographically guaranteed and settled on a shared L1 without requiring external validators or honest minority assumptions 2) There are no liveness dependencies on third parties (i.e. solvers)

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the problem with building in the same space as your partner is that when he wants to use your biggest competitor, you have to threaten to break up

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idc if it’s basic, sugarfish slaps so hard and yes I’ve been to Japan and had sushi there

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when he does what I want he’s actually pretty okay

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@katherholt @mikadoe.eth

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7-9-2025 📈 Feeling very reflective today - it’s crazy to think how far I’ve come in 1 year and how different my life was one year ago. I’m grateful to everyone I’ve met along the journey and those I have learned from 🩷 thankful for the growth

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7-8-2025 🏃🏼‍♀️ The backlog is real today! I feel like I’m a hamster running on a wheel *insert gif here* back in the city for a few days and feeling the rat race.

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7-7-2025 💻 long weekend is over so it’s back to the grind today! it was great to get some family time in this weekend 💙 now we have work to get done and the countdown is on 👀

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views from dinner!

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coming back from a long weekend

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coming back to work after a long weekend

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are you a marshmallow toaster or a flamer?

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