Journey to Ethereum Core Dev

🇰🇷: https://junsong.xyz/ko/core-dev-journey-ko/ Belated career update: I've joined Offchain from this June, as an Ethereum core developer in Prysm. This was one of the milestones for my career, so really happy to share this 😄. Since I've dived into Blockchain and decided to start my

이더리움 코어 개발자가 된 이야기

En: https://junsong.xyz/core-dev-journey/ 안녕하세요, 다소 늦은 커리어 업데이트입니다. 이번 6월부터, Offchain에 합류하게 되었습니다. 이더리움 CL 클라이언트 Prysm에서 이더리움 코어 개발 일을 정식으로 시작하게 되었습니다. 제 커리어에서 나름대로 중요한 마일스톤을 달성하게 되었습니다. 블록체인을 처음 접하고, 이쪽에서 커리어를 결심한 시점 (2022년 초반, 군 전역 후 복학한 시기)부터 제 목표는

An (Early) 2026 H1 Retrospect

🇰🇷 Korean version: https://junsong.xyz/ko/2026-h1 It's still a bit early to be wrapping up the first half of the year, but this feels like a good spot to pause and put down a comma, so I'm writing a quick retrospective. I spent most of

2026 (이른) 상반기 회고

English version: https://junsong.xyz/2026-h1-retrospect 상반기가 마무리되기엔 아직 이른 이 시점, 쉼표를 찍기 좋은 지점인 것 같아 간단하게 회고록을 작성합니다. 저는 올해 대부분의 시간을 뉴욕에서 지내다가 얼마 전 한국에 다시 돌아왔습니다. 이번 회고는 뉴욕에서의 시간을 대부분 다룹니다. 지난 회고록들은 여기에서 확인해보실 수 있습니다. NYU 카이스트에서 제공하는 NYU 부전공 프로그램을

2025 H2 Retrospect

🇰🇷: https://junsong.xyz/ko/2025-h2/ This marks my third consecutive year writing a year-end retrospective. If the first half of the year was dedicated to studying CS courses after returning back to the university, the second half was spent traveling across the globe, gathering experiences that were both joyful and

2025 하반기 회고

English version: https://junsong.xyz/2025-h2-retrospect/ 벌써 3년째 이어가고 있는 회고입니다. 나름의 의무감으로 시작한 기록 남기기용 회고가 루틴이 되가고 있는 것 같아 좋네요. 근황 정리용으로도 종종 쓰입니다. '저 요즘 이렇게 지내요..!' 상반기는 오랜만에 복학해 학교 공부를 열심히 했었다면, 하반기는 전세계 이곳저곳을 다니며 즐거우면서 유익한 경험들을 많이 했습니다. (물론

Wrapping up EPF6 (EthCC ➡️ Devconnect)

🇰🇷한글 버전: Link Year 2025 must be a really meaningful year for me. My experience participating in and completing the sixth cohort of the EPF (Ethereum Protocol Fellowship) takes up a pretty significant portion of that. This post is a retrospective article on the past six months and hopefully something

EPF6를 마치며 (EthCC ➡️ Devconnect)

English version of this article: Link 2025년은 저한테 굉장히 의미 있는 한해가 될 것 같습니다. EPF(Ethereum Protocol Fellowship)의 여섯 번째 기수로 참여 및 완주를 한 경험이 그 중 꽤 큰 비중을 차지합니다. 지난 6개월 간의 회고 겸, 이후 EPF의 펠로우로 활동하고자 하는 사람들에게 도움이 될 수 있는 글을

Prysm's Sequence Number Issue: The Year-Long Fix

A Bug Discovered Monthly Contribution - August 2024💡Opened 4 PRs, and 3 PRs were merged to Prysm Opened 1 PR to EIPs Prysm #1 fix(tests): Correct misleading variable names and expressions in test files by syjn99 · Pull Request #14292 · prysmaticlabs/prysmWhat type of PR is this? Other What

오픈소스 작업록: 1년만에 고친 Prysm Sequence Number 이슈

발단: 이슈 발견 Monthly Contribution - August 2024💡Opened 4 PRs, and 3 PRs were merged to Prysm Opened 1 PR to EIPs Prysm #1 fix(tests): Correct misleading variable names and expressions in test files by syjn99 · Pull Request #14292 · prysmaticlabs/prysmWhat type of PR is this? Other What

칸에서 생긴 일 (EthCC[8] @Cannes)

칸에 다녀왔습니다. 유명한 영화제로만 들어본 곳이었는데, 좋은 기회가 생겨서 다녀올 수 있었습니다. 결론부터 말하자면 제 인생에서 이렇게 영어로 많이/깊게 얘기해본 적이 있었나 싶을 정도로 굉장히 알찬 (그리고 피곤한) 일주일이었습니다. 느낀 점이 굉장히 많은데, 하나씩 풀어보도록 하겠습니다. 어쩌다가 칸까지 매년 이더리움을 다루는 행사가 세계 곳곳에서 열립니다. EthCC는 그 중 가장

2025 H1 Retrospect

I'm heading to Paris, Bonjour! I will stay about three weeks at Paris and Cannes to participate some important Ethereum events (EthCC, Beam Day, EPF Day). Meanwhile, I am looking forward to visit Paris' renowned museums. As a big fan of art, I can't wait

Open-Source

Monthly Contribution - October 2024

💡Opened 1 issue to Prysm Prysm #1 Prysm API `GetActiveSetChanges` returns incorrect indices for exited and ejected validators · Issue #14564 · prysmaticlabs/prysm💎 Issue Description I came across an issue with the ExitedValidatorIndices function in the GetActiveSetChanges API (/prysm/v1/validators/active_set_changes). The returned indices for exited validat…GitHubprysmaticlabs

Core

How is my ETH deposit processed?

As Ethereum continues to evolve, so does its staking mechanism. This is the first article of the Staking at Ethereum series. This article addresses the end-to-end process of staking, from initial deposit to eventual withdrawal. A key feature of Ethereum’s PoS System is staking. By staking funds, users can

Open-Source

Monthly Contribution - September 2024

💡Opened and merged 2 PRs to Prysm Prysm #1 Add Electra case for GetBeaconStateV2 by syjn99 · Pull Request #14466 · prysmaticlabs/prysmWhat type of PR is this? Bug fix What does this PR do? Why is it needed? This PR addresses an issue when trying /eth/v2/debug/beacon/states/{state_

Open-Source

Monthly Contribution - August 2024

💡Opened 4 PRs, and 3 PRs were merged to Prysm Opened 1 PR to EIPs Prysm #1 fix(tests): Correct misleading variable names and expressions in test files by syjn99 · Pull Request #14292 · prysmaticlabs/prysmWhat type of PR is this? Other What does this PR do? Why is it needed?

Retrospect

2024 H1 Retrospect

Time has flown by, and it’s already been half a year. Last year, I conducted two retrospectives (2023-H1, and 2023-H2), and now it's time for another one. I initially thought that a six-month cycle was appropriate, but as things get more complex, it seems that without consistent

Retrospect

My 2023 H2

💪 2023 H2 Retrospect 2023, especially the latter half, flew by in a whirlwind. The biggest update is undoubtedly the progress on the Over Protocol blockchain mainnet, to which my company has been contributing. In July, after nearly 700,000 pre-registrations, Over Wallet launched and quickly surpassed 5 million users, drawing

Retrospect

My 2023 H1

⬆️ H1 Retrospect 💻 Frontend Developer As a junior frontend developer, I'm encountering and building up a variety of new tech stacks used alongside React. Here’s a list of the ones I’m working with: * Framework: Electron, Next.js (13) * CSS: Emotion, TailwindCSS * State management: Jotai, Zustand * Data fetching: