# Bryce Casaje Member of Technical Staff at Cognition (Devin/Windsurf); ex-Zellic and Cure53 security engineer; DEF CON CTF finalist with DiceGang Cognition United States ## At Cognition - Role: Member of Technical Staff (Engineering) - Joined: Jan 2026 - How they joined: Directly - Before Cognition: Lead Security Engineer, Zellic - Overlapped before Cognition with other Cognition people at: Amazon (https://www.autumn.ai/resources/cognition/worked-together) ## Identity - LinkedIn: https://www.linkedin.com/in/bryce-casaje - X: @strellic - GitHub: https://github.com/strellic - Website: https://str.lc - Domain: cognition.ai ## Notes - LinkedIn shows a direct move from Lead Security Engineer at Zellic (Apr 2024 - Oct 2025) to Member of Technical Staff at Cognition (from 2026). (https://www.linkedin.com/in/bryce-casaje) - Current role is Member of Technical Staff at Cognition. (https://linkedin.com/in/bryce-casaje) - Personal site str.lc describes current work verbatim as "Writing some slop @ Cognition." and lists prior employers as "Zellic, Cure53 / Electrovolt, AWS, NASA ARC." (https://str.lc/) - @jhanikhil stated that he and @strellic (Bryce Casaje) did a full 1:1 file-by-file port of Minecraft from Java to Rust, with both the server and client ported. (https://x.com/jhanikhil/status/2110508723127112158) - @jhanikhil stated that most of the mechanical porting of Minecraft from Java to Rust was done by swe-2, with some high-level guidance for how to translate Java to Rust from devin ultra, in the project he worked on with @strellic. (https://x.com/jhanikhil/status/2110508723127112158) - Only original X post naming Cognition: reply to @jkelleyrtp (Jonathan Kelley, Dioxus creator) "@jkelleyrtp @cognition Welcome!!!". (https://x.com/strellic/status/2098133269946769501) - DEF CON CTF finalist six times (29-34) per his site; plays with DiceGang (merged team SuperDiceCode placed 3rd at DEF CON CTF finals 2026, which he reshared) and Crusaders of Rust, whose corCTF he co-hosts. (https://str.lc/) - Member of the US team at the International Cybersecurity Challenge (ICC) and the European Cybersecurity Challenge (ECSC) 2024-25, per his site; listed in US Cyber Games Season IV roster (Round 2 with Alex Zhang). (https://str.lc/) - Open source: my-ctf-challenges (63 stars, JavaScript) collects his public CTF challenges; rhythm-cons holds rhythm-game controller designs; pathpatch (Rust, 2026) is an HTTPS path-interception tool built with devin-ai-integration[bot] PRs. (https://github.com/strellic) - At Cure53 (Nov 2022 - Apr 2024) he worked as a Security Engineer and his site credits Cure53's Electrovolt desk (Electron app security research) alongside it. (https://str.lc/) - Public headline says "EECS @ UC Berkeley grad | now @ Cognition". (https://linkedin.com/in/bryce-casaje) - Prem Qu Nair (@premqnair) replied to Bryce Casaje's post on 2026-06-10 telling him it is a permanent underclass for him. (https://x.com/strellic/status/2064498442681057686) - Salah Abbas (@0utwrest) replied to Bryce Casaje's post on 2026-06-10 with the comment 'fable mog'. (https://x.com/strellic/status/2064498442681057686) - Bryce Casaje was listed as an Engineer at Zellic who prepared the security assessment of Pye in the Sky Labs Ltd. (https://reports.zellic.io/publications/pye/) - Bryce Casaje co-prepared the Pye security assessment alongside fellow Zellic Engineer Junyi Wang. (https://reports.zellic.io/publications/pye/) - Bryce Casaje's assessment of Pye in the Sky Labs Ltd. reported 2 Critical, 1 High, 1 Medium, 4 Low, and 0 Informational findings. (https://reports.zellic.io/publications/pye/) - NASA Ames Research Center research intern, summer 2021, on the APRES (Activity Planning with Resources for the Exploration of Space) project: improved the DSL lexer/parser and built tooling for AI scheduling of space missions. (https://www.linkedin.com/in/bryce-casaje) - Bryce Casaje was a student member of the Granada Hills team known as Granada 1 in the California Mayors Cyber Cup competition. (https://sanfernandosun.com/2019/03/13/granada-hills-teens-finish-second-in-california-mayors-cyber-cup-competition/) - Bryce Casaje's Granada 1 teammates were Lawrence Lam, Vincent Rimparsurat, Marlon Agbayani, and Daniel Youn, and their coach was Jane Dinh. (https://sanfernandosun.com/2019/03/13/granada-hills-teens-finish-second-in-california-mayors-cyber-cup-competition/) - Security + software engineering.DEF CON 29-32 CTF finalist.CTFs w/ DiceGang 🎲https://github.com/strellichttps://str.lc; this comes from the profile summary and preserves the person's own positioning. (https://linkedin.com/in/bryce-casaje, https://github.com/strellichttps://str.lc) - Bryce Casaje (strellic) is the owner of the GitHub repository strellic/pathpatch, which contains a README describing pathpatch, a tool that intercepts HTTPS traffic for any hostname and replaces specific paths with custom content. (https://github.com/strellic/pathpatch/blob/main/README.md) - Bryce Casaje is acknowledged in the DiverseVul dataset paper for his contributions exploring multiple approaches for dataset construction, including manual labelling of commits and automated text-based labelling. (https://arxiv.org/html/2304.00409v2) - Bryce Casaje (strellic) devised and optimized the Google form submission program used to submit the kernelCTF flag, working alongside Larry Yuan (ehhthing). (https://anemato.de/blog/kctf-vdf) - Max Cai also assisted Bryce Casaje and Larry Yuan in the development and submission of the Google form submission program. (https://anemato.de/blog/kctf-vdf) - Bryce Casaje's program, combined with Savy's optimized exploit, achieved the fastest-ever kernelCTF submission at 3.6 seconds. (https://anemato.de/blog/kctf-vdf) - Bryce Casaje (strellic) authored a writeup on the corCTF 2021 challenges, including a solution for a challenge involving replacing HTML on the /api/comment page with a form endpoint, with his solution code linked at https://gist.github.com/strellic/a858a700c13232fe6e908f653c90f4ba. (https://str.lc/posts/corctf_2021_challenges/, https://gist.github.com/strellic/a858a700c13232fe6e908f653c90f4ba) - Bryce Casaje (strellic) created the corCTF 2021 challenge 'saasme', which received 2 solves (both unintended), with an intended solution chain starting from DNS rebinding and breaking puppeteer with the Chrome DevTools Protocol (CDP) to get a reverse shell, then using CDP again to place a breakpoint and read the flag. (https://str.lc/posts/corctf_2021_challenges/) - Bryce Casaje (strellic) cowrote the corCTF 2021 challenge 'saasme' with EhhThing on his team, and EhhThing wrote a writeup at https://larry.science/post/corctf-2021/#saasme-2-solves. (https://str.lc/posts/corctf_2021_challenges/, https://larry.science/post/corctf-2021/#saasme-2-solves) - Bryce Casaje (strellic) created the corCTF 2021 challenge 'styleme', a Chrome extension challenge with 1 solve, where the extension 'styleme' (https://chrome.google.com/webstore/detail/styleme/lnlohfhabkgnelnpbacookjnnfklehii) allowed users to install custom 'stylescripts' to apply custom CSS to pages. (https://str.lc/posts/corctf_2021_challenges/, https://chrome.google.com/webstore/detail/styleme/lnlohfhabkgnelnpbacookjnnfklehii) - Bryce Casaje (aka strellic) was the person bringing back a DiceCTF challenge that was similar to the prior year's but included a laser sensor on the floor and a lock picking challenge to get the final flag, as mentioned by the blog author who was happy to hear @strellic was bringing it back. (https://eth007.me/blog/posts/dicectf-finals/) - Bryce Casaje was a member of the team Jane Street Amateurs, which won the Gold Award in the Open Category at the HKCERT CTF event. (https://www.hkcert.org/event/hong-kong-cyber-security-new-generation-capture-the-flag-challenge-2023-seminar-and-award-presentation-ceremony) - Bryce Casaje's teammates on Jane Street Amateurs were Liu Yiming, Xu Xiaohai, and Pham Nguyen Ngoc Bien. (https://www.hkcert.org/event/hong-kong-cyber-security-new-generation-capture-the-flag-challenge-2023-seminar-and-award-presentation-ceremony) - GitHub orgs: ocf (Berkeley Open Computing Facility), dicegang, Crusaders-of-Rust; bio 'web/app sec / CTF player @Crusaders-of-Rust / @dicegang'. (https://api.github.com/users/strellic/orgs) - AWS SDE intern in Seattle, summer 2022: built internal tooling for managing EC2 instance capacity. (https://www.linkedin.com/in/bryce-casaje) - Previous roles include Member of Technical Staff at Cognition; Lead Security Engineer at Zellic; Security Engineer at Cure53; Software Dev Engineer Intern at Amazon Web Services (AWS); Research Intern at NASA Ames Research Center. (https://linkedin.com/in/bryce-casaje) - Education history includes Bachelor's degree, UC Berkeley Electrical Engineering & Computer Sciences (EECS); Bachelor of Science - BS, Computer Science, University of California, Berkeley. (https://linkedin.com/in/bryce-casaje) - X bio verbatim: '@cognition / ctf @cor_ctf @dicegangctf / grad @Berkeley_EECS / rhythm games, web/app security'; ~1.46K followers. (https://x.com/strellic) - Location is United States. (https://linkedin.com/in/bryce-casaje) ## Experience - Member of Technical Staff at Cognition (Jan 2026 - Present) - Lead Security Engineer at Zellic (Apr 2024 - Oct 2025): Led security audits and identified critical vulnerabilities in software used by millions of users. - Security Engineer at Cure53 (Nov 2022 - Apr 2024): Audited and identified critical vulnerabilities in software used by millions of users. - Software Dev Engineer Intern at Amazon Web Services (AWS) (May 2022 - Aug 2022): Interned at AWS in Seattle as a Software Development Engineer, Summer 2022. Built internal tooling for managing EC2 instance capacity across AWS infrastructure. Integrated with internal AWS data sources and APIs to automate capacity management workflows. - Research Intern at NASA Ames Research Center (May 2021 - Aug 2021): Interned at NASA Ames on the Activity Planning with Resources for the Exploration of Space (APRES) project. Developed tooling for AI scheduling and planning of space exploration missions. Built internal applications to improve working with custom domain-specific languages, working on programs to help facilitate error checking and syntax highlighting. Improved the language's internal lexer and parser to expand coverage and reliability. ## Education - UC Berkeley Electrical Engineering & Computer Sciences (EECS) - Bachelor's degree - University of California, Berkeley - Bachelor of Science - BS, Computer Science ## Sources - https://linkedin.com/in/bryce-casaje - https://brycec.me - https://x.com/strellic - https://x.com/jhanikhil/status/2110508723127112158 - https://github.com/strellic/pathpatch/blob/main/README.md - https://sanfernandosun.com/2019/03/13/granada-hills-teens-finish-second-in-california-mayors-cyber-cup-competition/ - https://reports.zellic.io/publications/pye/ - https://arxiv.org/html/2304.00409v2 - https://anemato.de/blog/kctf-vdf - https://str.lc/posts/corctf_2021_challenges/ - https://str.lc/posts/csaw_2020_finals_writeups/ - https://www.linkedin.com/posts/joshbrunty_honored-to-coach-this-incredible-group-of-activity-7402408010112868352-en8_ - https://www.linkedin.com/posts/bradleywolfenden_for-the-4th-year-in-a-row-the-us-cyber-team-activity-7382066472598134784-6PPk - https://str.lc/projects/ - https://x.com/strellic/status/2098133269946769501 - https://x.com/strellic/status/2064498442681057686 - https://eth007.me/blog/posts/dicectf-finals/ - https://www.uscybergames.com/season-4-team - https://www.hkcert.org/event/hong-kong-cyber-security-new-generation-capture-the-flag-challenge-2023-seminar-and-award-presentation-ceremony - https://api.github.com/users/strellic/repos?per_page=100&sort=pushed - https://api.github.com/users/strellic/orgs - https://github.com/strellic - https://www.linkedin.com/in/bryce-casaje - https://str.lc/ - https://github.com/strellichttps://str.lc - https://gist.github.com/strellic/a858a700c13232fe6e908f653c90f4ba - https://larry.science/post/corctf-2021/#saasme-2-solves - https://chrome.google.com/webstore/detail/styleme/lnlohfhabkgnelnpbacookjnnfklehii Researched with Autumn (https://www.autumn.ai) from public sources. Updated 2026-11-04. Profile: https://www.autumn.ai/resources/cognition/people/bryce-casaje · Everyone at Cognition: https://www.autumn.ai/resources/cognition/people