# Mario Kostelac (@mariokostelac) on x

- id: koinon:creator:x_mariokostelac
- url: https://koinonlink.com/kol/x/mariokostelac
- schema_version: 1.4

## Identity
- platform: x
- handle: mariokostelac
- platform_url: https://twitter.com/mariokostelac
- website: https://modelpredict.com/
- entity_type: creator
- person_id: Cross-platform identity not resolved for this creator.

## Reach
- followers: 1209
- following: 714
- posts_total: 7433
- posts_observed: 5
- posts_per_day: 1.172
- account_age_days: 6341
- verified: false
- size_tier: nano

## Engagement
- status: peak_post_only
- peak_post_engagement_rate: 0.00083
- best_post_interactions: 1
- measurement_source: x_post_interactions
- measurement_formula: interactions on one post — likes, or likes + reposts + replies depending on the discovery path (the two are not distinguishable in the stored data)
- comparable_pool: peak_interactions
- status_note: We have only the single best observed post, so no mean exists. peak_post_engagement_rate is an UPPER BOUND, systematically higher than an average — never compare it against an average rate.
- unit_note: engagement_rate and peak_post_engagement_rate are ratios (0-1); avg_interactions_per_post and best_post_interactions are absolute counts. Read status before reading any number: a null rate has several different causes and status says which one applies here.

## Content
- category: software
- subcategory: ai_tools
- category_confidence: 0.9
- category_source: derived_from_recent_content
- topics: Productionalizing ML models, AI coding tools and automation, Kubernetes and AWS infrastructure, Team hiring in AI, Fintech ML applications
- bio: ⚡️ Productionalizing Machine Learning @fin_ai

## Audience (inferred)
- status: present
- description: ML engineers and developers building production ML systems, mainly at AI startups and fintech companies
- roles: dev
- seniority: practitioner
- pain_points: Debugging complex Kubernetes and AWS infrastructure issues, Spending too much time on manual coding instead of shipping, Hiring experienced ML talent for production work, Dealing with unexpected bugs in cloud services at scale
- posts_analysed: 8
- confidence: 0.4

## Commercial (inferred)
- audience_buyer_fit: 0.9
- promotion_intent: 0.8
- open_to_collaboration: false
- contact: Koinon does not publish creator contact details.

## Quality signals
- authenticity_score: 44
- authenticity_basis: engagement_observed
- credibility_score: 44
- flagged_for_review: false
- koinon_bd_grade: C — measures Koinon partner-outreach fit, not creator quality
- interpretation: Signals for triage, not verdicts. A flag means the profile is worth a manual check.

## Evidence
- [x_mariokostelac#ed8d83e1] Such a good move for Wasp. I remember I was pushing them to do it years ago (5 to be more precise), but the tech just wasn't there. 👏👏👏 (https://twitter.com/mariokostelac/status/2072051848786145534)
- [x_mariokostelac#79f36c87] This is the reason I was super busy last few months. We were building our own models for Fin. Btw my team is hiring. If you think this TTFT drop is not impressive, come, join, and help us bring it further down.
- [x_mariokostelac#0ca006e0] This setup we have beats the best engineer in spelunking what happened on our kube cluster. And reports issues to aws automatically.
- [x_mariokostelac#257b7f1a] It's here, you don't need to wait 6-12 months. I've written 0 lines manually this year. And yes, I shipped a lot.
- [x_mariokostelac#7128412e] We are at inflection point. Wake up!
- [x_mariokostelac#f2780a1f] Sometimes you need only 5 instances of some aws services to face more bugs than David. Not going to name names.
- [x_mariokostelac#a33c1b39] Hello world, @intercom has fixed pricing.
- [x_mariokostelac#63ef3713] This guy knows how to roll. He doesn't refrain from deep integrations and spending time on "litt

## Provenance
Every inferred field below carries how it was produced. Facts stay facts; inferences stay inferences.

- audience.description: source_type=ai_inferred, confidence=0.4, freshness_days=78, method=llm_persona_from_recent_content
- audience.roles: source_type=ai_inferred, confidence=0.4, freshness_days=78, method=llm_persona_from_recent_content
- audience.seniority: source_type=ai_inferred, confidence=0.4, freshness_days=78, method=llm_persona_from_recent_content
- commercial.audience_buyer_fit: source_type=ai_inferred, confidence=0.6, freshness_days=78, method=llm_scorer — Relative signal within Koinon indexing, not a market-wide score.
- commercial.promotion_intent: source_type=ai_inferred, confidence=0.6, freshness_days=78, method=llm_scorer
- quality.anomaly_flags: source_type=heuristic, confidence=0.5, freshness_days=108, method=profile_snapshot_and_engagement_ratio_heuristic — Means "worth a manual check", NOT confirmed fraud. Flags can be wrong and are not a verdict about the person.
- quality.authenticity_score: source_type=heuristic, confidence=0.5, freshness_days=78, method=Profile-shape heuristic from a single snapshot (follower count, following ratio, account age, posting volume, verification), reduced for engagement red flags where post engagement was collected. Where only a follower count is available the score saturates at 58. — The input set differs by platform; do not compare this score across platforms.
- quality.koinon_bd_grade: source_type=ai_inferred, confidence=0.5, freshness_days=108, method=llm_partner_fit_classifier + fit_score >= 0.6 AND authenticity >= 60 => A; fit_score >= 0.4 AND authenticity >= 45 => B; else C. authenticity < 30 or a promotional-pattern flag => quarantine. — Koinon partner-outreach fit, not creator quality.
- reach.followers: source_type=observed, confidence=0.95, freshness_days=108, method=platform_profile

## Freshness
- profile_checked_days_ago: 108
- content_analysed_days_ago: 78
- audience_updated_days_ago: 78

## AI retrieval
- indexing_requests: 11
- user_triggered_requests: 0
- note: Being indexed in bulk is not the same as being retrieved to answer a question.

## This profile
- Claim or correct: https://koinonlink.com/claim?k=x_mariokostelac
- Request removal: https://koinonlink.com/claim?k=x_mariokostelac
- Terms: https://koinonlink.com/for-ai