Oleksandr K.

I design, build and scale complete SaaS products end-to-end - from the first architecture diagram to production deploys and long-term iteration.

11 years in the industry. Former CTO (Elementica), former engineering lead of a 25-person team (SpineMedia), and hands-on Principal Engineer across eight long-term Upwork engagements that average ~600 hours each. I partner with founders and product owners to turn an idea into a production multi-surface SaaS - backend, dashboard, SDKs, integrations, infrastructure - and stay for the long haul.

I'm not a "send-me-tickets" developer. I think in products, contracts, trade-offs, and lifetime architecture. I help founders shape scope, design the data model, negotiate technical decisions, choose stacks with trade-offs explained, and ship with CI/CD, tests, and observability - the way mature engineering teams ship.

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MOST RECENT SOLO BUILD - PixelFlow
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A multi-tenant MarTech SaaS that gives no-code website owners (Webflow, WordPress, Squarespace, Framer, etc.) reliable server-side conversion tracking for Meta Ads. I architected and shipped the entire ecosystem alone:
• NestJS API - multi-tenant backend, Meta CAPI forwarding, Stripe billing & trials, BullMQ event pipeline with retries and dedupe;
• Next.js dashboard - analytics, pixel & trigger management, onboarding, billing portal;
• JS Tracking script - lightweight vanilla-JS tracker; dual delivery: client-side Meta Pixel + server-side Meta CAPI;
• Visual Tagger - in-browser point-and-click trigger configurator, built with Preact for minimal runtime footprint;
• Webflow, Framer & WordPress Plugins - native install flows so non-technical users onboard without touching HTML.

In production today: 300,000+ events/day across 30M+ row tables, with the event pipeline tuned for low-latency ingestion and reliable downstream delivery.

The NestJS API is the single source of truth across all 5 surfaces. I owned the cross-component contracts, Meta compliance (incl. GDPR data deletion), multi-tenant billing boundaries, and CI/CD with automated e2e gating.

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HOW I WORK
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• Fluent English - I prefer direct calls and founder-level conversations over ticket shuffling.
• Direct founder/owner communication - I translate product vision into architecture and back.
• Cross-role perspective - I've worked as developer, tech lead, team lead (25 devs), project manager, and CTO. That shapes how I scope and decide trade-offs. • Reliable under pressure - when things get urgent, I'm available. Multiple clients have specifically noted this. • Built for the long run - my engagements tend to last years, not weeks. Clients come back because I treat their product like my own. • AI-accelerated, human-owned - I use Cursor with project-tailored rules, agents, and skills to compress iteration cycles. Every output is reviewed and tightened before it ships. Speed comes from leverage, not from cutting corners.