Akeyless2023 — 2025Live
Led cross-platform development of Akeyless’ secure password manager — iOS, Android, Windows and macOS for enterprise security teams.
Enterprise MobileCross-platformSecurity
Freelance · Israel
Senior Full-Stack & Mobile Developer helping startups launch MVPs and production-ready products without hiring a full engineering team.
10+
Years Experience
9
Production Apps
15+
Companies
10 years shipping production software for Stampli, Akeyless, PayEm, and the Tel Aviv Stock Exchange. Available for new projects.
StampliAkeylessPayEmTel Aviv Stock ExchangeIDF
- Built secure enterprise mobile applications.
- Delivered MVPs from idea to production.
- Integrated AI solutions and automations into existing products.
Services
What I help you build
MVP Development
From idea to a production-ready product you can show investors and users — scoped, built, and shipped.
Mobile Apps (React Native)
Cross-platform and native iOS apps built for real users, App Store review, and long-term maintenance.
Full-Stack Development
Backend, APIs, dashboards, and infrastructure that keep your mobile and web products running in production.
AI Agents & Automation
WhatsApp bots, voice agents, RAG pipelines, and workflow automation integrated into existing products.
Engagement
Ways to Work Together
MVP Build
4–12 weeks
Senior Mobile Engineer
Part-time / Full-time
AI Consulting & Automation
Custom engagement
StampliAkeylessPayEmTel Aviv Stock ExchangeHarel InsuranceNatali 24/7QR PartyTomax VixPalWalletMatrixIBMIDF C&ITStampliAkeylessPayEmTel Aviv Stock ExchangeHarel InsuranceNatali 24/7QR PartyTomax VixPalWalletMatrixIBMIDF C&ITStampliAkeylessPayEmTel Aviv Stock ExchangeHarel InsuranceNatali 24/7QR PartyTomax VixPalWalletMatrixIBMIDF C&ITStampliAkeylessPayEmTel Aviv Stock ExchangeHarel InsuranceNatali 24/7QR PartyTomax VixPalWalletMatrixIBMIDF C&IT
Case Studies
Real products. Real outcomes. Verifiable proof.
Anita242024 — PresentLive
Co-founded and built the AI operations platform powering 24/7 WhatsApp, voice and chat automation for customer-service businesses.
AI PlatformProduction AI24/7 Automation
anita24.comWhatsAppVoiceEmailChatSMSAPI
QR Party2025 — PresentLive
Solo-built and shipped a mobile app for event photo sharing — from idea to App Store with paid tiers and 13 languages.
Solo MVPIdea to App StorePaid Product
QR Party
App Store · 1.0.8
Live on the App Store
Mobile apps in production
9 live App Store apps across finance, security, healthcare, and more.
PayEm
Finance startupsEmployee finance app for requests, cards, transactions and receipt workflows.
Tel Aviv Stock Exchange
Finance startupsCapital-market mobile experience with securities, portfolio and disclosure flows.
App
Stampli
Finance startupsProcure-to-pay mobile workflows for approvals, requests, invoices and cards.
Natali 24/7
HealthcareHealthcare assistance app connecting subscribers to emergency and support services.
Harel Switch
InsuranceCar-insurance app for mileage tracking, documents, service access and support flows.
QR Party
Social & eventsSolo-built event photo-sharing app with QR onboarding, camera flows and paid tiers.
Akeyless Password Manager
Cyber securityEnterprise password manager app with secure secrets workflows and autofill support.
Tomax Vix
EducationExam-support app for scanning, monitoring, workspace verification and submissions.
PalWallet
CryptoSelf-custody wallet app for crypto assets, swaps, staking and account operations.
Recommendations
What clients and colleagues say
“Sergei is a talented high-tech professional with the ability to self-conduct. He sees both the macro and micro aspects of a project and delivers results in the best way possible.”
“Sergei is a very dedicated employee, self learner and reliable. He would be an excellent addition to any development team, both professionally and socially.”
Who I help
Founders and teams who need to ship — without hiring a full team.
Startups
Need an MVP or mobile app built fast, with senior ownership from day one.
SaaS Companies
Need to add mobile, AI features, or ship a major product initiative.
Companies needing senior capacity
Need a senior engineer embedded in your team for a quarter or longer — not another agency layer.
How I work
From idea to production.
One process, four stages. Works for a small MVP and for an enterprise system.
01
Discover
Understand the problem
Who is it for, why does it matter, how should it feel. Hard questions before anyone opens the code.
02
Design
Plan before building
Product spec, architecture and UI/UX. Planning before building saves half the time and a quarter of the budget.
03
Build
End-to-end development
Mobile, web, backend, AI, integrations. No shortcuts, no tech debt. Weekly demos, direct communication.
04
Ship
Production-grade launch
Performance, accessibility, security, App Store. Ongoing support and iteration after launch.
What I see in the field
Common problems I solve every week.
“We used AI to build it and now it doesn’t work”
Vibe-coded MVPs that look good in demos but crash in production. I take over, stabilize and ship.
“Our agency disappeared after launch”
No documentation, no ownership, no one who understands the code. I audit, document and get you back on track.
“We need a mobile app but don’t have a team”
I work as a one-person mobile team: scope, design, build, release and iterate.
“The app is live but it’s falling apart”
Performance issues, crashes, store rejections. I fix the architecture so you can ship again.
About
Senior engineer. Startup pace. Enterprise quality.
I’m Sergei Barats, a mobile and AI engineer based in Israel. Over the past 10 years I have shipped apps for Stampli, Akeyless, PayEm and the Tel Aviv Stock Exchange — and built my own products from scratch. I work best with founders and small teams who need senior ownership without the overhead of an agency.
Available for new projectsHourly · Fixed price · Long-term contracts
Hi, I’m Sergei.
Need an MVP, mobile app, or AI project?
Hi, I’m Sergei.
Need an MVP, mobile app, or AI project?