Przemysław Zalewski

Agentic engineering, by default

An agentic engineer: give me the goal, I ship it end to end

You hand me a goal, a few guidelines, or just a problem worth solving. I talk to the people who use the software, plan it, build it with coding agents under rules I enforce, verify it, ship it and measure it. You get working software in production, not moved tickets. Code, CI and docs stay in your repository and accounts from the first commit.

Calls this week · work starts 3 November 2026 · Wrocław, Poland (CET), remote

Przemysław Zalewski
~2/3of merged PRs in 2026 built with AI coding agents, nearly all through my review or merge
260+merged PRs of my own in 2026, plus 300+ reviews of other engineers’ PRs
270+tagged releases of one product in 10 months of 2026
4app stores I ship to end to end: iOS, Android, macOS and Windows, plus the web

Sound familiar?

Agentic engineering problems I solve in 2026

We bought Claude Code seats. Why is delivery not faster?

In METR’s randomized trial (10 July 2025), experienced open source developers took 19% longer to finish issues with AI tools, yet believed AI had sped them up by about 20%.

Seats are a tool, the workflow is the work. I run Claude Code and Codex by default under rules enforced by hooks, lint and test gates in CI, so the speed shows up as shipped releases: 270+ tagged releases of one product in 10 months of 2026.

Who reviews the PRs our agents open?

Faros AI’s 2026 engineering report (telemetry from 22,000 developers, analysis as of March 2026) found median PR review time up 5x at high AI adoption, with 31% more PRs merged without any review.

I do. In 2026 I merged 260+ PRs of my own and reviewed 300+ of other engineers’. About two thirds of merged PRs across two products were built with coding agents, and nearly all went through my review or merge, behind gates in CI that catch what a tired reviewer misses.

Sound like you? Book a free 30‑min call →

Tickets move in Jira, but the product does not

Faros AI’s telemetry from 10,000+ developers (23 July 2025) showed teams with high AI adoption completing 21% more tasks and merging 98% more PRs, with no significant correlation to improvements at the company level.

I take a goal, not a ticket, and count what reaches users: 270+ tagged releases of one product in 10 months. I answered about 99% of Sandtime support myself, so I see what users hit after every release and fix that first.

We need someone who ships without a PM

Anthropic’s study of its own engineers (2 December 2025) found everyone becoming more full‑stack, and named a paradox of supervision: overseeing Claude takes the same coding skills that heavy AI use can erode.

15+ years of shipping is what lets me supervise agents and own the outcome. Give me a goal and I take it end to end: plan, build with agents, review, release and support. I led an app through Google’s CASA Tier 2 twice, passed in January and October 2026.

Facing one of these? Book a free 30‑min call →

Why me

Agents by default, the responsibility stays mine

In 2026 about two thirds of merged pull requests across two products were built with coding agents, and nearly all went through my review or merge: 260+ PRs of my own and 300+ reviews of other engineers’. Lint, type and test gates in CI reject the mechanical problems before a human looks.

A product engineer, not a ticket mover

Where there is no product manager, I set priorities with the people who use the software and answer them myself: about 99% of Sandtime.io support went through me. Jira, Linear or GitHub Issues are fine if you have them; I use them when they help, and moving cards is not the job.

A generalist who runs production

TypeScript, React and Node.js every day, ten years of C# and .NET, Python when the work needs it. Web, mobile, desktop, Cloudflare, Postgres, Docker, CI/CD, monitoring and logging: I own what I ship, after the deploy too. See the full‑stack page.

Fast, and verified before it counts as done

Done beats perfect, without shortcuts where they are risky. 270+ tagged releases of one product in ten months of 2026, every change behind tests, and every feature measured in PostHog. A product I led passed Google’s CASA Tier 2 security assessment in January and again in October 2026. Outside checks agree: the product I led passed Google’s CASA Tier 2 security assessment in January 2026 and again in October 2026. How the agents work under rules is on the AI consultant page.

Live demo

Watch one real task run, goal to production

A replay of a real feature on Sandtime.io, built at Sanddev: people could not connect Claude’s web connector because it has no field for an API key. Step through it as it happened: the goal, the plan, the agent session, the gates that failed, the hardening, the review and what shipped.

Demo loading…

Every step is from the actual pull request, with names removed. Bring your own goal to the call and we sketch its run the same way.

Ways to work together

Four shapes of engagement

Want a number first? The configurator shows hours, a price range and the start date. The call is free either way.

goal

Give me the goal

One outcome and a budget: “customers can pay by card”, “the import stops failing”, “agents can use our API”. I come back with a plan within days and ship the first slice in week one.

Book a free call →

guidelines

Give me guidelines

Your architecture, your conventions, your review. I work inside your repositories and CI, write the rules your agents follow, and keep to your definition of done.

Book a free call →

just act

Or let me act

A spending cap and a weekly call. I pick the highest-impact work from your users, analytics and backlog, ship it, and show you the numbers every week.

Book a free call →

full capacity

Dedicated contract

About 167 hours a month of senior work for $7,500 net, three months minimum, one month’s notice on either side. The best value when you have months of work.

Book a free call →

Proof

Work I can show

Problem, what I did, result. Client names only where I am allowed to use them.

An AI coding agent as a team member, under enforced rules

The problem
Coding agents write code faster than a team can review it. A team of four wanted the speed without a slop swamp on main.
What I did
I authored the rule set shared by Claude Code and Codex: mechanical checks over written rules, lint and test gates for security, API surface and CSP, agents working on main with hooks, every PR reviewed by a human, AI‑assisted content disclosed as such.
Result
In 2026 about two thirds of merged pull requests across two products were built with coding agents, and nearly all went through my review or merge. I merged 260+ PRs of my own and reviewed 300+ of other engineers’. My commits across those two products went from under 1,000 in 2025 to 7,500+ by October 2026.

~2/3 PRs with agents 300+ reviews 7,500+ commits in 2026

An MCP server from first merge to first external users

The problem
Users of Sandtime.io, the time tracker I built at Sanddev, used by 4,000+ freelancers and teams, wanted to log time from their AI assistants. The API existed, the agent surface did not.
What I did
I set the tool surface, removed destructive tools, routed every operation through the existing REST controllers so an agent gets no wider access than a person, and instrumented adoption per client in PostHog from day one.
Result
First external users. A bot-protection rule that rejected MCP clients by user agent was found and removed the same day because the dashboard showed it.

MCP OAuth adoption dashboard

Restarting delivery after three years of maintenance mode

The problem
A mature product had drifted into maintenance. The backlog was old and the team small.
What I did
Agent-assisted development under an enforced rule set, help docs migrated from WordPress into the repo as markdown with 301 redirects and i18n, help added to the Definition of Done.
Result
From about 60 commits in 2025 to 4,800+ by October 2026, about 80× year over year, one less server to break during holidays, docs that match the product.

~80× commits YoY docs-as-code

Facing something similar? Book a free call →

How it works

Three steps from this page to a running project.

  1. 1

    A 30-minute call

    You describe the product and the problem. I ask the questions I would ask on day one.

  2. 2

    Scope in writing

    Within 24 hours after the call you get a short written plan: what we build first, what we measure, how we work together and what it costs. No slide deck.

  3. 3

    Working software in week one

    Deployed, measured and open for your review. After that, the numbers set the pace.

Fit check

Is this a fit?

A good fit when

  • You need a senior who owns delivery, not a pair of hands
  • The product has to ship and be measured, with or without a product manager
  • A solo engagement, or one team of up to four that I lead directly
  • TypeScript, React, Node.js, Cloudflare, Postgres, PostHog

Probably not when

  • A program that needs a ten‑person vendor team
  • A stack built around Java, Python or a cloud I do not work in
  • Body leasing by the hour with no say in how the work is done

Working style

How I work

Agents under rules

Claude Code and Codex work on main with hooks, lint and test gates. The model suggests, the criteria decide. Every PR gets a human review and AI‑assisted content is disclosed.

No product manager? Fine.

Where there is no PM I set priorities directly with the people using the software and answer support myself.

Zero bug policy

A bug is fixed or consciously closed, never parked. Alerts and error tracking in every project, so I learn about problems before the client does.

Good to know

Agentic engineering facts buyers ask about in 2026

METR could not rerun its slowdown study

METR’s 2025 trial found experienced developers 19% slower with AI tools. On 24 February 2026 it changed the study design because many developers no longer agreed to work without AI, and it called the new data a bad proxy for real productivity (METR).

Claude Code leads among coding agents

In the 2026 Stack Overflow survey (6 October 2026), 66% of coding agent users used Claude Code and 59% GitHub Copilot, and 48% of developers trust AI output when they can easily validate it (Stack Overflow 2026).

About 13 USD per developer per active day

Anthropic puts average enterprise Claude Code cost at about $13 per developer per active day and $150 to $250 a month, below $30 a day for 90% of users. Agent teams use about 7 times more tokens than a standard session (Claude Code costs).

Codex starts offline

Locally, Codex runs in an OS‑enforced sandbox with network access off and writes limited to the workspace. Turning on network or live web search widens prompt injection exposure (Codex security).

Headless Claude Code skips the trust prompts

A claude -p session, the usual mode in CI, shows neither the workspace trust dialog nor the approval prompt for servers in a repo’s .mcp.json. Anthropic also does not security-audit MCP servers (Claude Code security).

A GitHub issue can hijack an agent

On 26 May 2025 Invariant Labs showed a prompt injection in a public issue making an agent with the GitHub MCP server copy private repository data into a public pull request (Invariant Labs).

FAQ

Questions people ask before they book

What does agentic engineering mean in practice?
You give an outcome, not a task list. I break it down, delegate the mechanical work to coding agents under enforced rules, review and verify everything that ships, and stay accountable for the result. It is how I have worked every day in 2026.
Do you work with our Jira?
Yes, if you have it and it helps. I keep the board true to what ships, but I do not wait for tickets to be written for me: I talk to the people who need the change and write the plan myself.
Python, Go, something else?
TypeScript and Node.js are my daily stack. I write Python when the work needs it, for example data and AI pipelines, and I read any mainstream language well enough to fix and review it. If your core is a language I would be slow in, I will say so on the call.
Fast sounds risky. What stops you from shipping something broken quickly?
Small pull requests you can revert, CI gates the agents cannot skip, tests on the paths that make money, and a person who reads every merge. Speed comes from the agents doing the typing, not from skipping checks.
Who has the final word?
You do on the goal, the scope and the money. I do on how the code gets written and tested, and I say no to a shortcut that would hurt you later, in writing, with the reason.
Who owns the code, and what if you leave?
You do. The code lives in your repository and accounts from the first commit, the contract transfers the copyright to you in writing, and there is no proprietary framework to get stuck with. Every project keeps a runbook and architecture notes written from the code, and notice is one month on either side with a written handover.
Can we start small?
Yes. A two‑week trial covers five tasks from your backlog, with the price fixed before we start. Hourly work has no minimum either: stop at any time and keep everything done so far.
Do you carry liability insurance?
It depends on the engagement. For high‑risk projects, additional cover for that specific contract may be paid.
You are one person. What if you are unavailable, or something goes wrong?
The controls stay on your side. I work only through accounts you control, with least privilege and revocable in one click, so the code, its history and the rules for the agents stay in your repositories. No subcontractors; a substitute only if we both agree. Small pull requests keep every change reversible, and you get a full reply within 24 hours on working days. Liability insurance depends on the engagement; for high‑risk projects, additional cover for that contract may be paid for, with its cost reflected in the rate.
What reaches the models? Our code, our customer data?
You pick the mode: no AI, AI‑assisted or AI engineering. Training stays off, and secrets, customer data and logs never reach a model without your separate approval. I write the agent rules inside your repositories, so your team keeps them after we finish.
What does it cost?
The dedicated contract is $7,500 a month net. A first shipped slice is $3,672⁠–⁠$7,452 excl. VAT. Hourly work has no minimum. Rates and rules are on pricing.
How soon can you start?
From 3 November 2026. Book the call and bring the goal; you get a written plan and price within 24 hours after it.
How much does Claude Code cost per engineer?
Anthropic reports an enterprise average of about $13 per developer per active day and $150 to $250 a month, under $30 a day for 90% of users. Agent teams use about 7 times more tokens, and Team and Enterprise seats draw from a five‑hour and a weekly allowance (Claude Code costs).
Can attackers turn coding agents against us?
Yes. A prompt injection in a public GitHub issue made an agent leak private repository data in May 2025 (Invariant Labs), and in November 2025 Anthropic reported a state-sponsored group that used Claude Code to run 80 to 90% of an attack campaign against about 30 targets (Anthropic). Least privilege, one repository per session and a sandbox are the baseline.
We bought Claude Code seats. Why is delivery not faster?
In METR’s randomized trial (10 July 2025), experienced open source developers took 19% longer to finish issues with AI tools, yet believed AI had sped them up by about 20%. Seats are a tool, the workflow is the work. I run Claude Code and Codex by default under rules enforced by hooks, lint and test gates in CI, so the speed shows up as shipped releases: 270+ tagged releases of one product in 10 months of 2026.

Bonus · #suchar

A dad joke, on the house

Free, like the first call. Same sense of humor, included in every project.

Why did the AI agent forget the meeting?Punchline

It ran out of context. Ba‑dum‑tss.

What does an AI say in a job interview?Punchline

“Great question! You’re absolutely right.” Ba‑dum‑tss.

What’s the most expensive painting?Punchline

A Claude Monet. Priced per token. Ba‑dum‑tss.

In 30 minutes you will know if we are a fit

You bring the problem, I bring the questions. Want a number first? The configurator shows hours, a price range and the start date.

or write to ciunkos@gmail.com

After you book you get a calendar invite. Nothing else to fill in.

My pledge

  • Reply within 24 hours. I reply within 24 hours on working days, personally, not a bot. Weekend messages: by Monday noon.
  • Late means free. If I am late, the first hour of work is free. You do not have to ask.
  • Scope in writing within 24 hours. A free 30‑minute call with no company deck, then the scope and the price in writing within 24 hours. You decide.
  • The person who does the work. You talk to the person who does the work. No sales layer, no handoff.
  • Follow‑up only with news. I follow up only when I have something new for you. Never a "did you see my offer".
  • Honest "not a fit". If I am not the right person, I say so on the call and point you to someone who is.

Calls this week · work starts 3 November 2026 · B2B contract · Wrocław, Poland (CET), remote