invocation.io

Stripe Certified Professional Billing Architect

Payment systems that move millions. AI systems that actually ship.

I'm Andrej — an engineer with 10+ years shipping payment infrastructure, marketplaces, and production-grade AI automation for companies like Babbel and GigSocial. Hands-on from database schema to deploy, alone or with my delivery network.

Start a projectSee the work

Trusted by

BabbelGigSocialeifasSponsoredPissup TourseSalon

0+

years shipping in production

Fintech, marketplaces, and SaaS — independent delivery since 2014.

0+

projects delivered

From two-week rescues to multi-year platform ownership.

$0M+

moved for clients

Recurring revenue migrated, marketplace transactions processed, and payouts delivered worldwide.

01 / Services

Four ways I can help

Deep payments expertise, full-platform delivery, and AI automation that holds up in production — pick the engagement that fits.

Payment Integration & Migration

Integrations and zero-downtime migrations across Stripe, Adyen, and PayPal. I've moved hundreds of millions in recurring revenue for clients like Babbel.

  • Zero-downtime provider migrations
  • Subscription billing & dunning that recovers revenue
  • Cards, wallets, ACH, SEPA — every method your market needs
Learn more

AI Automation & Agentic Systems

LLM integrations and automated workflows that hold up in production. I run my own multi-agent dev platform daily — this is how I work, not a side bet.

  • Content, ads, outreach, and lead-gen systems that run on schedule
  • Business process automation with human checkpoints
  • LLM features and agentic dev workflows, engineered like real systems
Learn more

Platform & MVP Development

Two-sided marketplaces, SaaS products, and MVPs built end to end — database schema to production deploy, with billing wired in from day one.

  • Marketplaces with escrow, wallets, and payouts
  • MVPs that validate fast without becoming throwaway code
  • SaaS scaling: multi-tenancy, billing, background jobs
Learn more

Technical Consulting & Fractional CTO

Architecture reviews, payment audits, team leadership, and project rescue. Senior judgment without the full-time hire.

  • Architecture & payment system audits
  • Fractional CTO for funded startups
  • Project rescue when delivery has stalled
Learn more

Every engagement is AI-accelerated. I run Antrix OS — my own multi-agent development platform — so you get senior judgment at multiple-engineer throughput, without a team-sized invoice.

02 / Selected work

Real projects, measurable results

From payment migrations moving hundreds of millions in revenue to marketplaces paying out sellers worldwide.

All case studies

Babbel

EdTech

Migrating millions in recurring revenue with zero downtime

Adyen → Stripe migration of Babbel's recurring billing — hundreds of millions in revenue, zero downtime.

$100M+recurring revenue migrated

Read the case study

GigSocial

Social Commerce

Building a complete influencer marketplace from scratch

Two-sided creator marketplace with escrow, wallets, and global payouts — zero to thousands of transactions monthly.

1000smonthly transactions

Read the case study

eifas Licensing GmbH

FinTech

Modernizing a legacy fintech platform without stopping it

Led the AngularJS → React modernization of a live accounting platform — 100% uptime throughout.

100%uptime during migration

Read the case study

03 / How I work

A process built on not surprising you

I work as a partner, not a vendor — and partnership runs on predictability. Here's exactly what happens after you reach out.

  1. 01

    Scope

    A call and a short written assessment: what you need, what it costs, where the risks live. No discovery theater.

  2. 02

    Plan

    Architecture, milestones, and a first deliverable inside the first two weeks. You see working software early.

  3. 03

    Ship

    Production-grade delivery with tests, monitoring, and honest weekly updates — accelerated by my agentic AI tooling.

  4. 04

    Operate

    I stay accountable after launch. Most clients keep working with me for years, not weeks.

04 / Clients

What it's like to work with me

They built our entire marketplace from scratch — escrow payments, seller payouts, the whole thing. Three years later, we're still working together and the platform handles thousands of transactions monthly.

Tyler Thompson

CEO, GigSocial

Andrej and team did a fantastic job building a production grade application for our SaaS business.

Mitch Wainer

Founder, Sponsored

Andrej is talented, easy to work with, challenges your ideas where needed, and keeps deadlines.

Mads Thorsdal

Founder, Awesome Adventures Group

The cooperation with Andrej and the team was always characterized by the highest professionalism.

Matthias Nebur

Product Manager, eifas GmbH

We went from idea to a fully working booking platform in record time. The team understood exactly what salon owners needed and delivered a product our customers love using every day.

Jovan Stefanovic

Partner, eSalon.rs

Have a payments problem or an AI idea?

Tell me where it hurts. I'll tell you honestly whether I can help, what it takes, and what it costs.

Start a projectcontact@invocation.io

I reply within one business day.