Growth Engineering

Your
funnel
is
leaking.
Your
site
is
why.

I build conversion infrastructure for B2B SaaS founders who are done guessing why their traffic doesn't convert. Fast, tracked, and automated from day one.

<500msA 3s LP is just an expensive bounce
7 DaysBrief to live. Tracked and wired.
1Person. Builds it and reads the data.
0Hidden fees

Built on

Astro
PostHog
Supabase
Loops
ASTRO · POSTHOG · SUPABASE · LOOPS · REACT · AEO-READY · 5-DAY DELIVERY · SCHEMA MARKUP · TRANSPARENT PRICING · B2B SAAS · ZERO HIDDEN FEES · SOLO-BUILT ·
Growth Engineering

Pretty doesn't close deals. Infrastructure does.

Most agencies ship you something pretty and leave. I ship you something that tells you exactly what's broken and fixes it.

Growth Engineering isn't marketing. It's infrastructure. By the time we're live, your analytics are tracking the clicks that matter, your emails fire based on what users actually did, and your site loads faster than anything your competitors are running.

If it doesn't move your pipeline, it's just decoration.

AstroPostHogSupabaseLoopsReact
The Process
<500msLoad time. A 3s LP is just an expensive bounce.
7 daysBrief to live. Tracked, wired, ready for traffic.
0Hand-offs. One person builds it and reads the data.
1Engineer. No account managers, no juniors.
Growth Stack

The Stack Your Competitors Don't Have

Each tool in the stack has one job. Here's what they actually do.

Extreme Speed & SEO

Built with Astro for lightning-fast load times. Ships zero JS by default. 3× faster than any WordPress site, and Google notices.

High-End UI/UX

Design built around how people actually use websites, not how they're supposed to.

Interactive React

Dynamic islands where it matters, static everywhere else.

Data-Driven Insights

Deep user-behaviour analysis with PostHog: funnels, heatmaps, session recording, A/B tests.

Automated Funnels

Email sequences that send the right message based on what someone actually did on your site.

Secure Architecture

Supabase handles your database, auth, storage, and real-time features. Production-ready from day one.

How I Work

The Engineering Process

Four steps. Every project runs through all of them.

01

Audit

I find where your funnel breaks. Usually obvious within the first hour.

02

Build

Astro. Clean code. No plugins, no bloat, no WordPress. Ships fast.

03

Instrument

Full PostHog setup. Every click that matters gets tracked before we go live.

04

Iterate

Monthly sprints based on what the data says. Kill what is not converting. Double down on what is.

Serafim Krastev

Serafim Krastev

Growth Engineer

Connect on LinkedIn

One Growth Engineer. No hand-offs.

You get me. Not a middleman.

When we move fast, nothing gets lost. You're not briefing an account manager who briefs a junior who briefs a developer. You're talking directly to the person who builds it and reads the data when it's live.

  • You're talking directly to the person writing the code and reading your PostHog data. Not an account manager.
  • What you explain once stays with the person actually building it. Nothing gets lost.
  • I handle the full picture: audit, build, instrument, and iterate.
Pricing

No surprises. Just results.

Three clear options. Pick the one that matches where you are, not where an agency wants you to be.

The Sprinter

2,900€one-time

You're sending paid traffic to a page that wasn't built for it. I'll build a dedicated, tracked LP in 7 days. One campaign, one ICP, one goal.

  • Dedicated campaign LP, not your homepage
  • Sub-500ms load times. A 3s LP is just an expensive bounce.
  • PostHog tracking exactly where you lose people
  • Loops email fires based on what users actually did
  • Shipped in 7 days
Maintenance add-on+ 500€/mo
  • Up to 5h/mo of fixes & updates
  • Monthly PostHog analytics report
  • Loops performance check
  • Email Support
Build My LP
Most Popular

The Engine

2,500€/mo

For founders who need a Growth Engineer without the 150k€ salary. Every month I dig into your PostHog data, ship a new angle, and kill what isn't converting.

  • First LP built in month one. No separate Sprinter needed.
  • Monthly sprint based on what the data says
  • PostHog funnel dives to find and fix the friction
  • Loops sequences tuned every cycle
  • High Priority Email Support
  • 3-month minimum: build, iterate, prove it
  • Limited Availability
Start the Engine

The Overhaul

Custom

Your WordPress or Webflow site is the bottleneck and you already know it. Full migration to Astro, Supabase infrastructure, and dashboards your team will actually use.

  • Full Astro migration from WordPress or Webflow
  • Supabase for auth, databases & custom dashboards
  • Third-party API integrations
  • Scope and timeline agreed upfront. Zero surprises.
  • Limited Availability
Let's Talk

Let's Work Together

Your site should be closing deals while you sleep.

If it's slow, untracked, or silent after signup, that's an engineering problem. Let's find it.

Get In Touch

Start Your Project

Drop me a message about your project. I'll get back to you within 24 hours. No pitch decks, no sales calls, just a straight conversation about what you need.

Response within 24 hours
🎯Direct line to the person actually building your site
📊Free growth audit with every inquiry

Ready to scale your revenue?

Get Started