Dungeons & Dragons · 5e

Kayo Souza

Tech Samurai 8 · Software engineer · 8+ years

A software engineer’s résumé, in the language of Dungeons & Dragons 5e.

Roll for initiative

Dice tray

Click a die to roll it again. Each one leaves at its own moment, spins on its own axis and bounces its own way.

Page 1 · Character
Kayo Souza
Character name
Class & level
Tech Samurai 8
Background
Software engineer · 8+ years
Player name
kinho.dev
Origin
Vitória, Brazil
Alignment
Lawful pragmatic
Experience points
172 PRs at Experity
Architecture18+4
Delivery16+3
Reliability18+4
Reasoning17+3
Judgment16+3
Mentoring16+3
Inspiration
+3Proficiency bonus

Saving throws

  • +7ArchitectureARC
  • +3DeliveryDEL
  • +7ReliabilityREL
  • +3ReasoningREA
  • +3JudgmentJUD
  • +3MentoringMEN

Skills · Tech Samurai

  • +7Heihō · System designARC
  • +7Kaji · AWS & cloudARC
  • +9Kenjutsu · TypeScriptDEL
  • +9Kyūjutsu · Idempotent paymentsDEL
  • +6Iaijutsu · React & Next.jsDEL
  • +7Fudōshin · Reliability & SLOsREL
  • +7Shugyō · Testing disciplineREL
  • +9Onmyōdō · LLM agents & MCPREA
  • +6Ryūha · Distributed systems & KafkaREA
  • +6Shinobi · Security & RLSREA
  • +6Zanshin · ObservabilityJUD
  • +6Bushidō · Code reviewJUD
  • +6Daimyō · Technical leadershipMEN
  • +9Sensei · MentoringMEN
  • +6Tsūyaku · Portuguese & EnglishMEN

● proficient · ◉ expertise

16Passive Zanshin (observability)
18Armor classStrict types
+3Initiative
30Speedft
Hit point maximum76
76
Current HP
8d10
Hit dice
Death saves

Attacks & spellcasting

NameAtkEffect
Idempotent strike+9US$70M+ processed, duplicate charges eliminated
Canonical cut+9The model reads intent, code books the slot
Tenant ward+7Row-level security on 120 tables
Rapid import+7262s → 36s
Asset volley+616M+ assets in the Asset Library

Equipment

TypeScriptJavaKotlinPythonReactNext.jsNode.jsNestJSPostgreSQLKafkaAWSKubernetesClaude CodeMCP

Personality traits

Writes the ADR before the code. 14 of them at Experity so far.

Ideals

If an LLM agent books, pays or writes to production, the model can't be the last line of defense.

Bonds

Vitória, ES. Topo, co-founded with an accountant. The nearshore team on Care Agent.

Flaws

Won't call it done until it is safe to run twice.

Features & traits

Deterministic bookingExperity

Tech Lead of the nearshore team on Care Agent, Experity's LLM patient agent. Experity holds half of the US telemedicine market. Moved appointment booking into code with server-validated slot references, defined a 99.99% availability SLO and wrote 14 ADRs.

Idempotent paymentsYooga

Led payments with US$70M+ processed across 6M+ transactions. Idempotent flows and signed webhooks eliminated duplicate charges. Built SmartPOS in Kotlin/Android with the Stone SDK.

Asset craftNike

Built the Asset Library behind 16M+ assets and AutoCrop, a GenAI service that cut designers' preparation time 44%. Automated asset generation from Figma AutoLayout.

Tenant wardTopo

Co-founded Topo with an accountant. Built the product architecture, engineering and security. Five-figure ARR in its first year with zero spend on distribution. PostgreSQL row-level security forced on all 120 tenant tables.

Civic toolsTegrus

Built ReurBR: a Vue 2 web app and a React Native app for offline field collection. The platform has since issued 9,872 property deeds across 14 municipalities.

Tools for teamsTegrus

Built the Ogilvy Brasil timesheet and task app. Helped build the design system and the CRM-integrated landing-page and form framework that made development 3x faster.

Other proficiencies & languages

Portuguese: native or bilingual · English: native or bilingual · Spanish: limited working proficiencySystem design · Technical leadership · Payment systems · Distributed systems · Observability · Mentoring
Page 2 · Allies & backstory

Allies & organizations

Experity emblemExperityCurrent
Topo emblemTopoCurrent
CODERS emblemCODERSCurrent
Yooga emblemYoogaPast
Nike emblemNikePast
QuintoAndar emblemQuintoAndarPast
Loft emblemLoftPast
Tegrus emblemTegrusPast

Character appearance

Hair
Dark, short
Eyes
Behind black-rimmed glasses
Marks
Neck tattoos, earrings
Home
Vitória, Espírito Santo

Personality

  • Writes the decision down before the code: 14 ADRs at Experity.
  • Teaches what he learns. Black Belt Mentor at CODERS.
  • Trusts a system only when it is safe to run twice.
  • Builder at heart: co-founded Topo with an accountant.

Backstory

From Vitória, Brazil. Studied Computer Science at Ifes and shipped his first e-commerce code at Backstage Digital in 2018. Moved into govtech at UpCities and Tegrus, where he built ReurBR, the land-regularization platform that has since issued 9,872 property deeds. Then credit at Loft, logistics at QuintoAndar and payments at Yooga, where he led a stack that processed US$70M+. At Nike he built the Asset Library behind 16M+ assets. In 2025 he co-founded Topo, and in 2026 he joined Experity as Tech Lead of the nearshore team on Care Agent, the LLM agent for US urgent care.

Treasure

US$70M+payments processed · Yooga
16M+assets · Nike Asset Library
9,872property deeds · ReurBR
99.99%availability SLO · Care Agent
3xfaster delivery · Tegrus framework
Page 3 · Spellcasting
Spellcasting class
Tech Samurai
INTAbilityReasoning
14Save DC
+6Attack bonus
Cantrips
Claude CodeMCP skill serversBedrock AgentCoreLLM-judge evals
Canonical action illustration
1st level

Canonical action

Care Agent uses a Python orchestrator, MCP skill servers and AWS. The model reads intent; code books the selected appointment.

Cited answer illustration
2nd level

Cited answer

Topo's Claude assistant uses tools, cited answers and a per-tenant cost cap. Scored 94.7% on a held-out LLM-judge evaluation.

Read-only portal illustration
3rd level

Read-only portal

Opened Topo to customer systems with a read-only MCP connector using OAuth, plus a versioned public API.

Shared grimoire illustration
4th level

Shared grimoire

Built the nearshore team's Claude Code reference environment at Experity, showcased across the organization.

Level, ability scores, modifiers, armor class, hit points and initiative are game flavor, just for fun. The career facts are real.

Kayo Souza · Character sheet