Juraj Masar

Snapshot

Co-Founder & CEO of Better Stack (observability / developer tooling — “a radically better observability stack,” competing with Datadog/New Relic). Slovak by origin; native in both Slovak and Czech; built Better Stack in Prague, Czech Republic (2021), now SF-HQ’d. ^[ambiguous: “Slovak vs Czech” — Masar is ethnically Slovak and a native Slovak speaker, but the company and his operating base are Prague/Czech; both labels appear in sources, so use “Slovak founder, Prague-built company”]. init.inc’s $10K soft-commit angel (direct, friend of Sazzad) and an active connector into the seed VC network.

Background

• Career arc: Founded Appivia.com (2012, later acquired by Prizeo, where he also worked as a software engineer); VP of Engineering at Represent.com (~2014, custom-apparel platform — he recounts a near-fatal DB-migration incident there as career-formative). ^[The Org + Dash0 Code RED transcript]
• Prior companies (serial founder): Founded Appivia.com (2012, acquired by Prizeo), founded Customer.guru (2017, customer-feedback / NPS product), and co-founded Wallmine (2019, financial-data platform) before Better Stack. ^[Wikipedia + The Org + me.sh profile]
• Better Stack (2021–present): Founded in Prague with Veronika Kolejak (Co-Founder & COO, ex-Google software engineer); Tomáš Hromada is CTO. Origin story: Juraj wanted a phone call when his website went down (“how hard can this be?”) and made a bet with friends to ship a working uptime-call service in one week. Launched two products — Better Uptime (uptime/incident) and Logtail (log management) — later merged into the unified Better Stack platform (now adds status pages, eBPF-based OpenTelemetry tracing, error tracking, RUM, and an AI SRE / MCP server).
• Scale & posture: ~$28.6Mtotalfunding(1priorround,incl.a\ast \ast$10M round led by KAYA**) ^[single-source on round detail]; ~30 employees across 9 countries (team is ~42% in Czechia). Crossed $2M ARR with only 3 software engineers; runs a deliberately tiny, very-senior team and emphasizes profitability. Customers cited include Brave, NordVPN, UNICEF, Hugging Face (status page).
• Education: Charles University (Prague). ^[single-source]

Investing (as angel)

Active angel investor alongside running Better Stack — named angel in E2B and Upheal (plain-text; not roster pages) ^[single-source]. For init.inc he is writing a $10K angel check (soft commit). His check-writing is founder-to-founder / relationship-driven rather than a structured fund.

Public voice (EXHAUSTIVE — “everything he’s said”)

Juraj has a real, opinionated public footprint centered on small high-leverage teams, developer-led growth, and observability economics.

• Writing — juraj.blog (Substack, “Early-stage startup engineering”):
  • “100x Software Engineering” (2023-06-03): his signature thesis — the best engineers aren’t 2–5–10x but 100x more productive (“creating more value in a single day than a big-co engineer creates in 3 months”). Cites Google (3-person start), Apple II (25 people), WhatsApp (600M users / ~50 engineers), Instagram (30M users / 13 engineers at $1B),Basecamp.Proofpoint:\ast \ast "atBetterStackwehadonly3softwareengineerswritingcode\dots whenwecrossed$2 million in ARR.”**
  • “New level of interview hell” (LinkedIn pulse, 2024-11): defends Better Stack’s unusual hiring bar — a PHP take-home for a Rails full-stack role — because “by ‘full-stack’ I mean engineers build products end-to-end. There’s no artificial boundary… we move very fast. There are almost no meetings. No sprint planning. No brainstorming… You can get to flow, play your favorite music, write code and deploy the feature the same day.” Targets “tiny teams of super experienced people” (ex-CTOs, ex-VPs Eng).
• Podcasts / video:
  • Dash0 “Code RED” #40 — “Breaking the Observability Model: Pricing, AI SRE, and a Developer-First Mindset” (with Mirko Novakovic, 2026-03-19; full transcript on dash0.com). Notable verbatim:
    • “how hard can this be? … we made a bet that we were going to launch this in a week.”
    • On GTM: “my DNA was in B2C… in online marketing” — grew Better Stack via SEO/SEM and “powered by Better Stack” status-page footers (“every one of those had powered by Better Stack in the footer… it brought us direct referrals… and it helped us with SEO”). 100,000 YouTube subscribers (“1 or 2 videos coming out every day… let’s educate people instead of selling them on benefits and features”).
    • On AI: “data sovereignty is a very real thing. I encourage our customers to store their data, not in Better Stack, but… in their own buckets in open format so that they’re in charge of their data.” Pitch = “instrument with no code changes via eBPF/OpenTelemetry, store 80x the data for the same budget, rebuild your workflow around an AI/MCP server.”
    • On positioning: “behave like Switzerland and integrate with all the other tools”; observability will be re-narrated as the “AI category” (start with AI, then drill into traces/dashboards).
  • Software Engineering Daily — “Better Stack: A New DevOps Experience with Juraj Masar” (2021-07-15) — early founder interview (Logtail + Better Uptime).
  • Better Stack YouTube channel (100k+ subs) — developer-education content (mostly product/dev topics, not personal long-form).
• Social: LinkedIn linkedin.com/in/jurajmasar/ (active poster — software design, hiring, small-teams) and the juraj.blog Substack. No public X/Twitter handle found for him personally ^[no public X handle found 2026-05-25 — he channels public voice through LinkedIn + blog + Better Stack’s YouTube].

Personal & interests (rapport)

• Origin: Slovak; multilingual — native Slovak & Czech, professional English, elementary German.
• Builder identity: strongly identifies as a founder-engineer who ships fast; preaches small teams, flow, and minimal process. Came up in B2C / online-marketing before B2B dev tools — sees marketing and engineering as one discipline, not silos.
• Values profitability and capital efficiency over blitz-scaling — a natural philosophical match with a lean, product-led startup like init.inc.
• Writes publicly and reflectively (blog + LinkedIn essays) — engages on craft, not just metrics. Good rapport angle: talk shop on small-team leverage, PLG/SEO growth, and the observability/AI-SRE shift.

Fundraise Relationship (init.inc)

• Relationship facts: He is soft-committed at $10K (confirmed 2026-04-27, direct/friend channel). He is one of init’s better-networked friends into European + SF seed VCs. His strongest live edge is Misha @ Susa (warm, “very impressed”); his KAYA/Creandum intros went cold.
• Conversation log (newest first, from CRM):
  • 2026-05-13 — KAYA (Karel Zheng) and Creandum (Carl Fritjofsson) intros marked Lost (cold-no-response to Juraj’s 2026-05-05 emails; not a thesis pass).
  • 2026-05-05 — Juraj intro’d init to Karel Zheng (KAYA VC) and Carl Fritjofsson (Creandum).
  • 2026-05-01 — init met Misha Gordon-Rowe (Susa) Fri 3:00 PM via Google Meet (Juraj’s intro, sent 2026-04-28) — “Misha was very impressed.”
  • 2026-04-30 — Per Juraj: pursue Misha > Chad at Susa (Chad is post-economic, has a young kid, time-constrained, would defer to Misha).
  • 2026-04-27 — Juraj soft-commits $10K as an angel.
• Mutual connections / warm path: Direct friend of Sazzad. Connector to Susa Ventures via Misha Gordon-Rowe (and the deprioritized Chad Byers path); cold intros to KAYA VC (Karel Zheng) and Creandum (Carl Fritjofsson).
• Personal & rapport notes: Founder-to-founder peer, not an institutional check. Topics in his wheelhouse: small-team leverage, PLG/SEO growth, observability/AI-SRE, capital efficiency. He responds to shipped product over decks. ^[single-source: CRM for the soft-commit + intro edges]
• Live stage: tracked in the CRM (Google Sheet).

Cross-check vs existing wiki

• Prior stub described him as “Czech” and “~$28.6Mraised,incl.a$10M round led by Kaya”; the $28.6M figure and the KAYA-led round are confirmed (LinkedIn company data + Wikipedia). Refined nationality to Slovak founder / Prague-built company ⚠️ (prior “Czech” was imprecise, not wrong — he’s a native Czech+Slovak speaker who built in Prague).
• Susa edges (Misha primary > Chad) match Susa Ventures, Misha Gordon-Rowe, and Chad Byers pages — no contradiction.

Related

Susa Ventures · Misha Gordon-Rowe · Chad Byers · KAYA VC ^[needs-page] · Creandum ^[needs-page]

Pass 2 deal pattern (2026-05-25)

Verified (LIGHT pass — individual angel, ~$10K-class checks). No Pass-1 CSV existed → created firms/juraj-masar.csv with 2 rows (net-new 2), both 2-source verified as angel positions.

• Check size / cadence / role: Founder-engineer who angels occasionally, founder-to-founder. CB Insights and Tracxn independently agree his entire angel book = exactly 2 companies (E2B + Upheal) — he is a low-volume, relationship-driven angel, not a structured fund or prolific check-writer. Check size is the **~$10Kclass\ast \ast (matcheshis$10K soft-commit to init.inc); individual angel ticket, never a lead.
• E2B ✅ confirmed: Juraj angel in E2B’s Pre-Seed, 2023-09-06 (CB Insights: “latest investment was in E2B as part of their Pre-Seed on September 06, 2023” + Tracxn). Round = **$2.5M,8investors,ledbyKAYA\ast \ast —notablythe\ast \ast sameKAYAthatledBetterStac{k}^{\prime }sround\ast \ast ,sothisisaKAYA-networkdeal.E2B(FoundryLabs,Inc.)=cloudruntime/sandboxesforAIagents;sinceSeries-A^{\prime }d($56M total). Thesis-adjacent to init.inc (agent infra).
• Upheal ⚠️ partial: Juraj named as angel by 2 aggregators (CB Insights + Tracxn). Round confirmed **$1.05M/€1.068Mpre-seed,Oct2022\ast \ast (Uphealblog+Tech.eu)—AIsession-notesformental-healthprofessionals(Prague/EU).Theroun{d}^{\prime }sindividual-angellistis{n}^{\prime }tpublished,sohisexactcheckisunconfirmed(assume$10K class).

Best data channel: Tracxn + CB Insights investor profiles are the reliable channel here (both cleanly enumerate his 2-company angel book) — unusual for an individual angel, but he’s tracked because he’s a notable founder. Round-level facts from the portfolio companies’ own blogs (upheal.io) + EU press (Tech.eu, Vestbee). His personal check role per deal is not published.

COULDN’T-GET: Juraj’s exact check size in E2B or Upheal (not disclosed at round level); any third angel position (both DBs cap his book at 2 — appears complete).