Developer CV

Julius Marminge

Full-stack Engineer 52% MATCH

Builds the screen, the API and the database for one feature, alone.

34tools rated
10expert
9use often
7/8families
Interactive portfolio →My tools on the radar
Self-reported ratingsScored by a public checklistNo scripts, no tracking
Package & buildContainers & clustersInner loopDev environmentsMonorepos & frameworksLocal services & dataAI & agentsPlatform

Role fit

Scored with roadmap's job loadouts: a must-have tool counts 3, an every-day tool 2, a good-to-know tool 1, times my level. Solid rings are tools I rated; dashed ones I haven't.

Best fit

Full-stack Engineer

52%match

Builds the screen, the API and the database for one feature, alone.

Must have4/5
Next.js●●●pnpm●●●Docker ComposePrisma●●○Vite●●●
Every day4/7
Docker DesktopDrizzle ORM●●●Mock Service Worker●○○VitestGitHub Actions●●●SentrySupabase CLI●○○
Good to know2/5
FliskMlMailpitngrokT3create-t3-app●●●Vercel CLI●○○

Second fit

Frontend Engineer

49%match

Builds the screens people click on, and makes them fast and clean.

Must have4/5
Vite●●●pnpm●●●Next.js●●●Mock Service Worker●○○nvm
Every day3/7
esbuildTurborepo●●●npm●●○VitestGitHub Actions●●●SentryRollup
Good to know2/4
Astro●●○PwPlaywright MCPNetlify CLIVercel CLI●○○

Third fit

Indie Hacker / Solo Founder

41%match

One person building a whole product. Wants cheap, fast and few moving parts.

Must have4/5
Next.js●●●Supabase CLI●○○PocketBaseVercel CLI●○○Cursor●●○
Every day3/6
Claude Code●●○Docker Composepnpm●●●SentryngrokGitHub Actions●●●
Good to know1/5
FliskConvex●●○WrWranglerMlMailpitOllama

Next closest roles

  • Founding Engineer33%
  • Tech Lead31%
  • Open-source Maintainer29%
  • Developer Advocate / DevRel28%
  • Release Engineer24%
  • Student / Junior Developer18%
Backend line

APIs, workers and databases, from one service to a dozen. 3 of 7 levels on the line.

  1. 1

    Level 14/9 known

    Package Wrangler

    Install, pin and update dependencies without breaking your teammates.

    On the line
    pnpm●●●uvMimise
    Branches
    npm●●○Bun●●○Poetry●○○HomebrewCargoGo modules

    Pick one package manager per language and commit the lockfile.

  2. 2

    Level 22/8 known

    Build Master

    Turn source into fast, cached, repeatable builds and tasks.

    On the line
    Vite●●●MakeJust
    Branches
    esbuildTurborepo●●●NxGradleBazel

    Make every build and test runnable with one short command.

  3. 3

    Level 30/7 known

    Container Crafter

    Package any service as an image and run a few of them together.

    On the line
    Docker DesktopDocker ComposeTestcontainers
    Branches
    PodmanObOrbStackCloud Native BuildpacksDvDive

    One Dockerfile per service, one Compose file for all of them.

  4. 4

    Level 40/8 known

    Inner-Loop Runner

    Edit code and see it live across many services in seconds.

    On the line
    CwCompose WatchTiltFlisk
    Branches
    Pbprocess-composeOvOvermindAirnodemonLsLocalStack

    Aim for a save-to-running loop under five seconds.

  5. 5

    Level 50/8 known

    Cluster Tamer

    Develop against Kubernetes, locally or bridged to a shared cluster.

    On the line
    KdkindHelmSkaffold
    Branches
    k3dMnminikubeTelepresenceMrmirrordK9k9s

    Only reach for Kubernetes locally when production runs on it.

  6. 6

    Level 61/7 known

    Agent Wrangler

    Run multi-agent systems with tools, memory and models on your own machine.

    On the line
    Vercel AI SDKModel Context ProtocolOllama
    Branches
    LangGraphMastraLangfuseClaude Code●●○

    Treat the agent like another service with health checks and logs.

  7. 7

    Level 72/7 known

    Platform Architect

    Give every team golden paths, a portal and infrastructure as code.

    On the line
    TerraformGitHub Actions●●●OpenTelemetry●○○
    Branches
    OpenTofuPulumiArgo CDBackstage

    Write down the path you took so the next team gets it for free.

Expert in

10 tools I'd teach. Scores are roadmap's public checklist, 10 points a check.

Next.jsMonorepos & frameworks · App frameworks
adopt

React framework for full-stack web apps

Easy to use80
Big real systems0

★ 143k · released 5 days ago

Cx
CodexAI & agents · Coding agents
trial

OpenAI's coding agent for terminal, IDE and cloud

Easy to use80
Big real systems0

★ 131k · released 1 days ago

VitePackage & build · Build tools
adopt

Frontend dev server and build tool

Easy to use80
Big real systems10

★ 84k · released 1 days ago

pnpmPackage & build · Package managers
adopt

Fast, disk-efficient Node package manager

Easy to use70
Big real systems20

★ 37k · released 1 days ago

Drizzle ORMLocal services & data · ORMs and migrations
trial

SQL-like TypeScript ORM with drizzle-kit migrations

Easy to use60
Big real systems20

★ 36k · released 20 days ago

TurborepoMonorepos & frameworks · Monorepo tools
adopt

Task runner and cache for JavaScript monorepos

Easy to use90
Big real systems20

★ 31k · released 8 days ago

Tcd
T3 CodeAI & agents · Coding agents
assess

Open-source control plane for many coding agents

Easy to use50
Big real systems0

★ 31k · released 1 days ago

T3
create-t3-appMonorepos & frameworks · Scaffolders
trial

Scaffold a typesafe Next.js, tRPC and Prisma app

Easy to use50
Big real systems0

★ 29k · released 11 months ago

ChangesetsMonorepos & frameworks · Monorepo tools
adopt

Versioning and changelogs for multi-package repos

Easy to use50
Big real systems0

★ 13k · released 44 days ago

Agent skills

Skills on roadmap's Skills tab that match the tools I rated expert or use often, with the score Haiku got for picking and following each one. They match my tools; this page doesn't say I use them.

vercel-react-best-practices100/100
vercel-labs/agent-skills

70 rules from Vercel to make React and Next.js apps fast. Fixes waterfalls and big bundles.

Matches Next.js (expert)
codex40/100
garrytan/gstack

Ask the OpenAI Codex CLI for an independent second opinion on your code or plan.

Matches Codex (expert)
github-actions-templates100/100
wshobson/agents

Build GitHub Actions workflows for test, build, push image and deploy.

Matches GitHub Actions (expert)
git-guardrails-claude-code100/100
mattpocock/skills

Add a Claude Code hook that blocks git push, reset --hard, clean -f, branch -D and similar.

Matches Claude Code (use often)
prisma-orm-setup100/100
prisma/skills

Set up Prisma ORM in an app or repair a broken database connection.

Matches Prisma (use often)
github-actions60/100
callstackincubator/agent-skills

GitHub Actions for React Native iOS simulator and Android emulator builds with downloadable artifacts.

Matches GitHub Actions (expert)

Toolkit

All 34 tools I rated, by level.

●●●

Expert

10
pnpm●●●

Fast, disk-efficient Node package manager

Vite●●●

Frontend dev server and build tool

Changesets●●●

Versioning and changelogs for multi-package repos

T3create-t3-app●●●

Scaffold a typesafe Next.js, tRPC and Prisma app

Next.js●●●

React framework for full-stack web apps

Turborepo●●●

Task runner and cache for JavaScript monorepos

Drizzle ORM●●●

SQL-like TypeScript ORM with drizzle-kit migrations

CxCodex●●●

OpenAI's coding agent for terminal, IDE and cloud

TcdT3 Code●●●

Open-source control plane for many coding agents

GitHub Actions●●●

CI/CD workflows built into GitHub

●●○

Use often

9
Bun●●○

JavaScript runtime, package manager and bundler in one

npm●●○

The package manager bundled with Node.js

Tdtsdown●●○

Library bundler for TypeScript, powered by Rolldown

Astro●●○

Content-first web framework with islands

Convex●●○

Reactive TypeScript backend with a local dev server

Prisma●●○

TypeScript ORM with schema migrations and Studio

Claude Agent SDK●●○

The Claude Code agent loop as a library

Claude Code●●○

Anthropic's agentic coding tool for the terminal and IDEs

Cursor●●○

AI-first code editor forked from VS Code

●○○

Have used

15
Poetry●○○Cnconcurrently●○○Dev Containers●○○direnv●○○Nix●○○Lerna●○○Vercel CLI●○○Kysely●○○Mock Service Worker●○○Supabase CLI●○○CdrConductor●○○Fhfx●○○OpenCode●○○Dependabot●○○OpenTelemetry●○○
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