Freelancer profile translated to English.
Back to original languageAbout Sacha
Founder of Kryva.fr (B2B SaaS in production). In 4 months solo (December 2025 → April 2026), I shipped what many teams take 18 months to release: Claude agent with 40+ tools in production, Vapi outbound voice agent, Stripe Connect Express with automatic monthly payouts, Apollo pipeline (50k+ enriched leads), multi-modal authentication (passkeys, OAuth, OTP), GDPR + AI Act compliance.
WHAT I DO THAT OFTEN STALLS ELSEWHERE:
- Production Claude agents with tool-use (not demos)
- Vapi voice agents integrated with your CRM
- Stripe Connect Express + auto commissions/payouts
- Next.js 16 RSC sprints + Server Actions + Supabase RLS
- Multi-modal Auth (WebAuthn, Google SSO, magic links)
- Apollo automation + email sequences
AVAILABILITY: full-time, starting this week, short or long mission. Daily rate €550. To start: Discovery 1 day €550 (audit + roadmap); MVP, integration, and missions on a fixed-price basis upon quote according to need. 50% deposit upon signing. Bilingual FR/EN, I work with US/UK/NL/DE teams without issues.
WEBSITE: sachapraljak.com
CALENDLY: calendly.com/sacha-ruer/15min
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- KryvaFounder & Lead AI Engineer (Claude, Vapi, Stripe Connect, Next.js)SOFTWARE PUBLISHINGJanuary 2026 - Today (7 months)Paris 15 Vaugirard, FranceSolo founder of Kryva.fr, a B2B SaaS in production. In 4 months, I designed and shipped: a Claude agent with 40+ tools in production (tool-use with human validation, streaming, cross-tool state), Vapi outbound voice agent calling 50+ leads/day, a Stripe Connect Express ambassador system with automatic monthly payouts, an Apollo pipeline (enrichment + sequences + voice agent escalation), and multi-modal authentication (WebAuthn passkeys, Google SSO, magic links, OTP). Stack: Next.js 16 (RSC + Server Actions + multi-tenant Supabase RLS), Vercel Edge, Claude API, Vapi, Stripe, Resend. GDPR + AI Act compliance + French accounting integrated.
- Freelance independantFull-Stack & AI EngineerSOFTWARE PUBLISHINGJanuary 2021 - Today (5 years and 7 months)Paris, FranceIndependent freelancer since 2021. Specialized in AI development, Next.js / React web applications, native mobile applications (Google Play, Apple Store), macOS apps, and Java projects.Recent client projects:• Production Claude agents with tool-use (40+ tools, human validation, streaming, cross-tool state)• Vapi voice agents integrated with CRMs• Stripe Connect Express marketplaces with auto monthly payouts + KYC• Apollo automation: 50k+ leads enrichment, email sequences, voice agent escalation• Native mobile apps + custom websitesLatest major creation: Kryva.fr (B2B SaaS in production, December 2025 → April 2026, solo in 4 months).
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Education
- BTS Management Commercial Opérationnel (MCO)Developer Training + Independent Learning2026BTS MCO en cours. Formations développeur complémentaires + apprentissage indépendant en développement IA, web et mobile.