Penumbra Tech
[Now booking: Q3 2026—]

Reliable code. Real impact.

Penumbra Tech is the single-engineer practice of Wesley Weaver Jr. I build across the seams: software, infrastructure, data, operations, and the human process around them. Web apps, AWS, Unreal Engine systems, and the reliability work that keeps everything from quietly falling over.

[Engineering, not slides—]

The actual code I write.

This is a real function from the diagnostics dashboard: the SSE flush that lets the latency chart stream cleanly even when k6 is firing 1,500 req/s. Tight, documented, no framework gymnastics. That's the style across every project on this site.

diagnostics.js
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// 1-second SSE flush — keeps the chart smooth even at 1500 req/s.
function flushK6Bucket(run, now) {
  const a = run.k6Bucket;
  if (a.count === 0) return;
 
  const sorted = a.durations.slice().sort((x, y) => x - y);
  const p50 = sorted[Math.floor(sorted.length * 0.5)];
  const p95 = sorted[Math.floor(sorted.length * 0.95)];
  const mean = sorted.reduce((s, v) => s + v, 0) / sorted.length;
 
  broadcast(run, {
    type: 'k6_bucket',
    t: now,
    reqCount: a.count,
    failedCount: a.failedCount,
    p50, p95, mean
  });
 
  a.durations.length = 0;
  a.count = 0;
  a.failedCount = 0;
}
[How engagements start—]

Three ways to work together

Concrete shapes with concrete prices. Pick one or ask me which fits — I'll tell you if neither does.

Start here
$5K

Diagnostic Week

A short, focused engagement to find your actual constraint and put a written plan against it. One week digging through your stack, your data, and the bottleneck you can name. End the week with a written plan plus a fixed-price build quote. The fee rolls into the build credit if we move forward; the plan is yours either way.

Best for: You think you know what is wrong, but you want a senior eye on it before committing to a 4-6 week sprint.

Most common
$10K – $25K

Build Sprint

4-6 weeks of fixed-scope work with weekly demos. Half paid up front, half on acceptance. The second half is not owed if week-one deliverables miss the agreed criteria. Typical scopes: a customer portal, an internal dashboard, a backend rescue, an audit and remediation.

Best for: You have a defined project and you want it shipped reliably without having to manage it daily.

Ongoing
$250 / hr

Retainer

Block-of-hours arrangement for ongoing operations, on-call backstop, smaller asks, or the long-tail mode after a build engagement wraps. Hours roll month to month; no minimum monthly commitment.

Best for: You want a senior engineer on speed-dial without hiring full-time.

Next intake window opens within ~2 weeks of intro call

[From the client side—]
"Heyo! Ryan from 360 Auto here. Our website was in shambles and Wes was able to redesign it and brought up the calls and car count from 20-30 up to 40-50 a week. He treated our website like his own and really knocked it out of the park."

Ryan, owner · 360 Auto · Port Orchard, WA

Read the full engineering writeup: Repair360 case study →

[What I do—]

Engineering across the stack

Most projects need a generalist who can pick up the entire problem instead of handing it off across three teams.

Custom software

Full-stack web apps, internal tools, and APIs. Built clean, documented, and handed over so your team can keep going.

Cloud & backend

AWS deployments, MySQL and DynamoDB, CI/CD pipelines, and the operational glue that keeps a service running at 3am without paging anyone.

Game development

Unreal Engine builds, multiplayer systems, AI behaviour, web portals for live games. See the case study under Projects.

Performance & reliability

Load testing, security hardening, incident response. I find where your stack breaks before your users do.

[Three free resources—]

Pick whichever question you arrived with.

Most prospects arrive with one of three unasked questions: what does this cost, why pay for an engineer when an LLM exists, or could I just do this myself. There's a long-form answer for each, so the 30-min intro can be about your project instead.

[Let's talk—]

Have something tangled you want untangled?

Send a quick note describing what you're building or what's stuck. I'll reply with whether I think I can help. No commitment, no template-bot follow-up sequence.