https://tech.buzzvil.com/en Engineering and product insights from Buzzvil en Wed, 23 Sep 2026 00:00:00 GMT https://tech.buzzvil.com/en/blog/memorydb-tracking-items-2 https://tech.buzzvil.com/en/blog/memorydb-tracking-items-2 Wed, 23 Sep 2026 00:00:00 GMT Hello, I’m Simon (Sangwon Lee), a server engineer on the allocation systems team. This is part two of “What Was Filling Up MemoryDB?” Part one followed our investigation into what was consuming 85% of… Simon Lee Backend MemoryDB Redis engineering https://tech.buzzvil.com/en/blog/geoip-embedded-db-memory https://tech.buzzvil.com/en/blog/geoip-embedded-db-memory Mon, 21 Sep 2026 00:00:00 GMT Three-point summary 1. We found that reading an external file—the GeoIP database—accounted for a large share of the heap. 2. We compared reading the database through mmap with embedding it directly as… Elric Lim Backend go geoip memory pyroscope datadog https://tech.buzzvil.com/en/blog/designers-open-the-prs-now https://tech.buzzvil.com/en/blog/designers-open-the-prs-now Tue, 08 Sep 2026 01:00:00 GMT This article is based on the English original. 6 months. 432 pull requests. One design team. What got better, and what it cost us. Recently, one of our designers was exploring a lucky-draw concept in… Maxence Mauduit Design design design-system ai workflow claude-code pull-request https://tech.buzzvil.com/en/blog/memorydb-tracking-items-1 https://tech.buzzvil.com/en/blog/memorydb-tracking-items-1 Sat, 05 Sep 2026 00:00:00 GMT Hello, I'm Simon Lee, a server engineer on the Ad Allocation Systems team. Recently, memory usage in our team's MemoryDB (Redis) reached 85%, leaving less than 500 MB available. This is the story of f… Simon Lee Backend MemoryDB Redis engineering https://tech.buzzvil.com/en/blog/ai-buzzforce-salesforce-crm https://tech.buzzvil.com/en/blog/ai-buzzforce-salesforce-crm Mon, 06 Jul 2026 00:00:00 GMT 0. What it means to build a new CRM Hello, I’m Frank, Youngmin Koh, a backend engineer in the Ad Management team. I’d like to share our journey from the first discussion about replacing Salesforce in… Frank Koh (고영민) Backend ai crm salesforce buzzforce ax https://tech.buzzvil.com/en/blog/cpu-dynamo https://tech.buzzvil.com/en/blog/cpu-dynamo Sat, 04 Jul 2026 00:00:00 GMT Three-point summary 1. Pyroscope monitoring identified the paths consuming the most CPU. 2. AWS SDK v1 unmarshalling beneath our DynamoDB wrapper was the cause; a major library upgrade addressed it. 3… Elric Lim Backend go pyroscope dynamodb https://tech.buzzvil.com/en/blog/a-design-system-for-an-agent https://tech.buzzvil.com/en/blog/a-design-system-for-an-agent Tue, 30 Jun 2026 01:00:00 GMT This article was adapted from the English original. As a Frenchman, I love spending time in the kitchen, cooking things for the fam. As a designer, I love crafting delightful interactions. So in the f… Maxence Mauduit Design design-system ai agent interaction-design design https://tech.buzzvil.com/en/blog/harnessing-ai-coding-agents https://tech.buzzvil.com/en/blog/harnessing-ai-coding-agents Tue, 23 Jun 2026 01:00:00 GMT This article is based on the English original. Editor’s note. The narrator of this article is not a person. It is Claude Code itself, the AI coding agent that works in Buzzvil’s web monorepo every day… Maxence Mauduit Design ai agent claude-code engineering workflow https://tech.buzzvil.com/en/blog/feature-flag-api-p99-latency-improvement https://tech.buzzvil.com/en/blog/feature-flag-api-p99-latency-improvement Sat, 02 May 2026 00:00:00 GMT The latency experienced by the 1% After introducing feature flags, our Supply group needed infrastructure to store evaluation results and make better use of A/B testing. We used the export functionali… Elric Lim Backend feature-flag go opensource https://tech.buzzvil.com/en/blog/ai-native-design-workflow https://tech.buzzvil.com/en/blog/ai-native-design-workflow Thu, 23 Apr 2026 01:00:00 GMT This article is based on the English original. Over the past month, Buzzvil’s design team shipped five web applications and made 344 commits. Remarkably, Figma was barely involved. There were no engin… Maxence Mauduit Design design design-system ai workflow claude-code monorepo https://tech.buzzvil.com/en/blog/nobody-owned-the-website-now-everybody-does https://tech.buzzvil.com/en/blog/nobody-owned-the-website-now-everybody-does Wed, 15 Apr 2026 01:00:00 GMT This article is based on the English original. Who owns your company website? It sounds like a simple question. But at most companies, the honest answer is somewhere between "marketing, sort of" and "… Maxence Mauduit Design design-system ai brand monorepo product-strategy https://tech.buzzvil.com/en/blog/the-flip https://tech.buzzvil.com/en/blog/the-flip Sat, 28 Feb 2026 01:00:00 GMT The Korean edition of this article was AI-translated from the English original. There's this assumption floating around that AI is going to generate design systems for us. That one day you'll prompt s… Maxence Mauduit Design design-system ai agent interaction-design ux https://tech.buzzvil.com/en/blog/dynamo-query-limit-rcu-optimization https://tech.buzzvil.com/en/blog/dynamo-query-limit-rcu-optimization Fri, 23 Jan 2026 05:00:00 GMT Hello, I’m Jed from Buzzvil’s Supply Platform team. Low latency and high availability matter when handling large volumes of traffic. That is why we make extensive use of DynamoDB and its promise of “S… Jed Jeon Backend Backend DynamoDB RCU SearchLimit Go AWS Optimization Query https://tech.buzzvil.com/en/blog/python2-ci-test https://tech.buzzvil.com/en/blog/python2-ci-test Thu, 18 Dec 2025 15:00:00 GMT Introduction Hello, I’m Elric from the Supply group’s Product Backend team. Honeyscreen frequently deploys new promotions, but its long CI pipeline—about thirteen minutes—had become a bottleneck durin… Elric Lim DevOps Backend Python CI DevOps https://tech.buzzvil.com/en/blog/2026-buzzvil-design-stack https://tech.buzzvil.com/en/blog/2026-buzzvil-design-stack Thu, 27 Nov 2025 01:00:00 GMT 2026 marks a transition year for Buzzvil Design. Our tool choices are no longer just operational decisions, they are strategic steps toward a unified, code-connected design system capable of supportin… Maxence Mauduit Design design design-system figma ai tools workflow https://tech.buzzvil.com/en/blog/buzzvil-supply-product-backend-team https://tech.buzzvil.com/en/blog/buzzvil-supply-product-backend-team Fri, 31 Oct 2025 08:00:00 GMT Hello, I'm Wynn, lead of the Product Backend team in Buzzvil's Supply group. We're currently looking for a new teammate to help us grow. A job posting can only tell you so much about a team and its wo… Wynn Huh Backend Backend Product BuzzBenefit Engineering Go Team Data Datadriven https://tech.buzzvil.com/en/blog/buzzvil-frontend-history https://tech.buzzvil.com/en/blog/buzzvil-frontend-history Mon, 04 Aug 2025 16:09:16 GMT I'm Luke from the Product Growth team in Buzzvil's Supply group. I would like to share how our frontend architecture has changed over the past few years. From AngularJS through Vue and React to Next.j… Luke Hwang Frontend frontend react javascript typescript vue nextjs angularjs bff monorepo server-driven-ui hybrid-sdk https://tech.buzzvil.com/en/blog/aws-cost-optimization-part-1 https://tech.buzzvil.com/en/blog/aws-cost-optimization-part-1 Mon, 29 Apr 2024 15:00:00 GMT During 2023, Buzzvil reduced AWS costs by approximately KRW 120 million per month, equivalent to around KRW 1.4 billion annually. In this series, we share the experience and practical tips. - AWS Cost… Zune Seo DevOps aws cost finops https://tech.buzzvil.com/en/blog/데이터-엔지니어의-데이터-파이프라인-ci-테스트-개선기 https://tech.buzzvil.com/en/blog/데이터-엔지니어의-데이터-파이프라인-ci-테스트-개선기 Thu, 18 Apr 2024 06:00:00 GMT Introduction Hi, I’m Abel, a data engineer at Buzzvil. In this post, I’ll explain how we reduced our data pipeline CI test time from around seven minutes to around three. <br/<br/ Background Our Data… Abel Yoon Data & ML airflow data_platform CI https://tech.buzzvil.com/en/blog/ad-management-geo-targeting-improvement https://tech.buzzvil.com/en/blog/ad-management-geo-targeting-improvement Thu, 21 Mar 2024 09:27:53 GMT Hello, I'm Kay, a backend developer in the Ad Management unit of the Demand Product team. It's already been almost two years since I joined. I'd like to introduce what Ad Management (AdM) does and sha… Kay Lee Backend https://tech.buzzvil.com/en/blog/버즈빌-ml-platform-1 https://tech.buzzvil.com/en/blog/버즈빌-ml-platform-1 Thu, 25 Jan 2024 07:40:43 GMT Introduction Hi, I’m BK, an MLOps engineer at Buzzvil. Our advertising platform team uses a variety of machine learning models to optimize ad performance. In this two-part series, I’ll introduce buzzf… bk-kang Data & ML Machine learning Infrastructure Platform https://tech.buzzvil.com/en/blog/쿠버네티스에게-github-actions-설치에-대해-묻다 https://tech.buzzvil.com/en/blog/쿠버네티스에게-github-actions-설치에-대해-묻다 Mon, 01 Jan 2024 15:42:31 GMT Introduction Hi, I’m Cade, an engineer on Buzzvil’s DevOps team. GitHub Actions has become one of the most popular CI/CD platforms, and many of you probably use it already. Today, I’ll share the decis… cade-seo DevOps github actions CI DevOps Kubernetes https://tech.buzzvil.com/en/blog/rds-mysql-메모리-right-sizing https://tech.buzzvil.com/en/blog/rds-mysql-메모리-right-sizing Thu, 16 Nov 2023 05:52:17 GMT This post describes a memory problem we encountered while running an AWS RDS MySQL database at Buzzvil, and how we resolved it. Introduction Hi, I’m Summer, an engineer at Buzzvil. At the time of writ… Summer Kwak Backend mysql rds aws cache https://tech.buzzvil.com/en/blog/postmortem-message-from-jacob https://tech.buzzvil.com/en/blog/postmortem-message-from-jacob Wed, 04 Oct 2023 14:18:43 GMT Introduction Hello. Gloria, who was there at both the beginning and the end of my time at Buzzvil, encouraged me to write this departure retrospective. Netflix has a practice of asking departing emplo… Jacob Yu Culture engineering growth culture https://tech.buzzvil.com/en/blog/셀프-서빙-데이터-플랫폼-구축하기 https://tech.buzzvil.com/en/blog/셀프-서빙-데이터-플랫폼-구축하기 Wed, 31 May 2023 05:00:00 GMT Introduction Hi, I’m Bernard, a data engineer at Buzzvil. In this post, I’ll introduce how our team built a self-service data platform: a platform where anyone can produce and consume the data they ne… Bernard Choi Data & ML airflow engineering data_platform https://tech.buzzvil.com/en/blog/budget-pacing-improvement-part-2 https://tech.buzzvil.com/en/blog/budget-pacing-improvement-part-2 Wed, 15 Feb 2023 02:00:00 GMT Hello, we're Bale and Liam from the Ad Engine team. In Part 1, we described our budget pacing architecture improvements and the observability we gained. This time, we will show how that work enabled b… Bale Do Liam Hwang Backend ad server engineering observability https://tech.buzzvil.com/en/blog/budget-pacing-improvement-part-1 https://tech.buzzvil.com/en/blog/budget-pacing-improvement-part-1 Wed, 08 Feb 2023 05:00:00 GMT Introduction Hello, we're Bale and Liam from the Ad Engine team. It is time for another look at the evolution of Buzzvil's advertising platform. We recently introduced how to build a horizontally scal… Liam Hwang Bale Do Backend ad server engineering observability https://tech.buzzvil.com/en/blog/multiply-your-design-team https://tech.buzzvil.com/en/blog/multiply-your-design-team Thu, 12 Jan 2023 06:30:25 GMT This article's timing is partly due to the major layoff happening worldwide. IT Companies have been building empires. Empires are, by their structure, as fragile as they are big. So while the world re… Maxence Mauduit Design design leadership design team https://tech.buzzvil.com/en/blog/how-buzzvil-product-team-works-3 https://tech.buzzvil.com/en/blog/how-buzzvil-product-team-works-3 Mon, 12 Dec 2022 07:29:41 GMT What began as a series in late 2021 has somehow reached the end of 2022. Over this year, the way Buzzvil's product team works has changed even more. Change has outpaced my writing, making it difficult… Whale Lee Product Product https://tech.buzzvil.com/en/blog/tech-blog-building-scalable-ad-server-with-elasticsearch https://tech.buzzvil.com/en/blog/tech-blog-building-scalable-ad-server-with-elasticsearch Sun, 11 Dec 2022 06:00:00 GMT The ad server is a core component of Buzzvil’s rewarded advertising platform. One of its main jobs is targeting: delivering ads to users who match the criteria advertisers specify. We have built and o… Zune Seo Backend Engineering Elasticsearch Ad server https://tech.buzzvil.com/en/blog/aws-dna-retrospective https://tech.buzzvil.com/en/blog/aws-dna-retrospective Tue, 15 Nov 2022 01:59:23 GMT DNA stands for Digital Native Architects, a training and networking program offered by AWS Korea. Here is a look back at my roughly three months in the fourth cohort. 1. Applying to DNA --- Last Novem… Jacob Yu Culture AWS DNA Retrospective https://tech.buzzvil.com/en/blog/what_ai_art_can_tell_us_about_the_future_of_design_and_ads https://tech.buzzvil.com/en/blog/what_ai_art_can_tell_us_about_the_future_of_design_and_ads Mon, 24 Oct 2022 23:35:12 GMT (Artwork generated by Dalle2 with the following prompt: A cyberpunk Designer looking at multiple screens with a robotic arm with neon lights in a dark, smoky room) I recently spent some time exploring… Maxence Mauduit Design AI Design Ad Creatives Optimization https://tech.buzzvil.com/en/blog/all-the-mistakes-we-made-during-product-discovery https://tech.buzzvil.com/en/blog/all-the-mistakes-we-made-during-product-discovery Fri, 30 Sep 2022 00:12:25 GMT 6 months ago we started a new team with a new mission and big dreams. We secured resources to give the mission a proper chance to go through Product discovery, a luxury in a fast pace startup like Buz… Maxence Mauduit Product Product Product Discovery Retrospective BIC https://tech.buzzvil.com/en/seminar/tech-weekly-gfs https://tech.buzzvil.com/en/seminar/tech-weekly-gfs Thu, 29 Sep 2022 15:00:00 GMT Every Wednesday, engineers from across Buzzvil’s teams get together to share expertise in areas that interest them and discuss new technologies related to their work. These sessions help us deepen wha… Raf Kim Engineering https://tech.buzzvil.com/en/blog/core-values-of-a-global-team https://tech.buzzvil.com/en/blog/core-values-of-a-global-team Thu, 22 Sep 2022 06:32:55 GMT Working in a global team in Seoul It’s always very special to work within a diverse team, even more in Seoul. When I say the BIC team is diverse, I truly mean it. We are a growing group led by our Tea… Sophie Cui Culture BIC global values Team https://tech.buzzvil.com/en/blog/building-a-startup-inside-the-startup https://tech.buzzvil.com/en/blog/building-a-startup-inside-the-startup Thu, 15 Sep 2022 07:30:56 GMT First, what’s a startup? What first comes to your mind when you think of the word “startup''? Entrepreneurship, small teams, funding, creative disruption, the k-drama… The list probably goes on and on… Mason Yun Culture BIC Culture Startup English Growth Team building https://tech.buzzvil.com/en/blog/max-story https://tech.buzzvil.com/en/blog/max-story Tue, 30 Aug 2022 02:00:00 GMT Yesterday, or to be exact, 8 years ago, I was joining Buzzvil as a product designer. In late 2014 Buzzvil counted a little more than 20 members and the design team was only 3 members including me. The… Maxence Mauduit Culture product Design Growth Management Personal development BIC https://tech.buzzvil.com/en/seminar/tech-weekly-metastable-failure https://tech.buzzvil.com/en/seminar/tech-weekly-metastable-failure Mon, 01 Aug 2022 15:00:00 GMT Every Friday, engineers from across Buzzvil’s teams get together to share expertise in areas that interest them and discuss new technologies related to their work. These sessions help us deepen what w… Raf Kim Engineering https://tech.buzzvil.com/en/blog/배포를-빠르게 https://tech.buzzvil.com/en/blog/배포를-빠르게 Tue, 05 Jul 2022 23:49:17 GMT This post explains how Buzzvil made deployments faster. - Deploying Elegantly: One-Click Deployment - Deploying Safely: Canary Releases and Rollbacks - Deploying Faster: DIY (Deploy It Yourself) The p… Noah Lee DevOps deployment https://tech.buzzvil.com/en/blog/optimizing-itemcf https://tech.buzzvil.com/en/blog/optimizing-itemcf Thu, 30 Jun 2022 01:04:32 GMT Buzzvil serves 30 e-commerce advertisers. To improve our retargeting solution, we introduced the Item-CF product recommendation algorithm. Here is how we optimized and deployed it. Buzzvil’s Retargeti… Peter Kim Data & ML Machine Learning Recommendation Collaborative Filtering Artificial Intelligence Python Ray https://tech.buzzvil.com/en/blog/배포를-안전하게 https://tech.buzzvil.com/en/blog/배포를-안전하게 Tue, 21 Jun 2022 23:49:17 GMT Balancing deployment speed and safety isn’t easy. This post explains how Buzzvil addressed the safety side. - Deploying Elegantly: One-Click Deployment - Deploying Safely: Canary Releases and Rollback… Noah Lee DevOps canary deployment rollback https://tech.buzzvil.com/en/blog/배포를-우아하게 https://tech.buzzvil.com/en/blog/배포를-우아하게 Tue, 14 Jun 2022 08:57:57 GMT Deployment systems usually become more complex as the number of runtime environments grows. This post explains how Buzzvil addressed that problem. - Deploying Elegantly: One-Click Deployment - Deployi… Noah Lee DevOps github deployment deployment api https://tech.buzzvil.com/en/blog/probability-in-es-search https://tech.buzzvil.com/en/blog/probability-in-es-search Tue, 07 Jun 2022 05:25:00 GMT This post explains two effective ways to apply probabilities to individual documents in Elasticsearch searches, with a brief performance comparison and discussion of their tradeoffs. I assume you can… Isac Yoo Data & ML elasticsearch es https://tech.buzzvil.com/en/seminar/tech-weekly-minerva https://tech.buzzvil.com/en/seminar/tech-weekly-minerva Thu, 02 Jun 2022 15:00:00 GMT Every Friday, engineers from across Buzzvil’s teams get together to share expertise in areas that interest them and discuss new technologies related to their work. These sessions help us deepen what w… Raf Kim Engineering https://tech.buzzvil.com/en/blog/asyncio-no-3-sigterm https://tech.buzzvil.com/en/blog/asyncio-no-3-sigterm Mon, 30 May 2022 08:32:00 GMT A server using asyncio needs to support graceful shutdown. Because work is registered as tasks on an event loop, shutting down without care can discard requests from users or other servers. The previo… Isac Yoo Backend python asyncio eventloop signal https://tech.buzzvil.com/en/blog/postech-lab-zine-interview https://tech.buzzvil.com/en/blog/postech-lab-zine-interview Mon, 02 May 2022 03:00:00 GMT Claud is an Engineering Manager on Buzzvil's Ad.Display team. After completing three years of service through Korea's professional research personnel program, an alternative military service arrangeme… James Kang Culture https://tech.buzzvil.com/en/blog/asyncio-no-2-future https://tech.buzzvil.com/en/blog/asyncio-no-2-future Mon, 04 Apr 2022 03:42:00 GMT Used well, Futures enable more varied control flow than simply applying await. The previous post introduced coroutines and the event loop, asyncio's core components. This time, we will look at creatin… Isac Yoo Backend python asyncio eventloop future https://tech.buzzvil.com/en/blog/asyncio-no-1-coroutine-and-eventloop https://tech.buzzvil.com/en/blog/asyncio-no-1-coroutine-and-eventloop Wed, 30 Mar 2022 03:18:00 GMT This series introduces asyncio’s components and how to use them. Our eventual goal is to implement the graceful shutdown process we use in production, explaining the asyncio concepts needed along the… Isac Yoo Backend python asyncio eventloop coroutine https://tech.buzzvil.com/en/blog/dynamo-go-latency-optimization-2-tls-handshake https://tech.buzzvil.com/en/blog/dynamo-go-latency-optimization-2-tls-handshake Tue, 29 Mar 2022 08:09:47 GMT Hello, I'm Raf, a data engineer at Buzzvil. Following the previous post on AWS credential tokens, I would like to share another attempt to optimize latency in a Go service using DynamoDB. This time, w… Raf Kim Backend aws dynamodb http go https://tech.buzzvil.com/en/blog/aws-gameday-2021 https://tech.buzzvil.com/en/blog/aws-gameday-2021 Thu, 17 Mar 2022 03:00:00 GMT Hello! We're Diane and Jacob from the Buzzvil Culture Committee. Buzzvil recently took part in AWS GameDay and achieved third place in Microservice Magic—a great demonstration of our engineering team'… Diane Rha Jacob Yu Culture Engineering AWS