You will get Mobile App Development | Swift iOS App Developer | Android App Developer
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Project details
Need a mobile app developer who's shipped real-world applications — not demo builds?
I deliver native and cross-platform mobile app development for startups and enterprises. Whether you need an iOS developer, an Android developer, or a React Native mobile solution that runs on both — we cover the full spectrum.
Native development:
— iOS development (Swift) — performance-critical, security-first apps
— Android app development (Kotlin) — scalable, production-grade Android apps
Cross-platform:
— React Native mobile — single codebase, native performance, faster time to market
— Flutter — smooth UI, strong for consumer-facing apps and MVPs
What we build:
— Fintech and crypto mobile apps with AML/KYC and hardware-level encryption
— E2E encrypted messengers with built-in crypto wallets
— Booking and marketplace mobile apps
— DeFi and Web3 mobile applications
— Mobile app design and UI/UX for intuitive user experiences
— Backend integration: Node.js, Python, PostgreSQL, AWS
Backed by a 45-engineer team with a live portfolio spanning iOS developer, Android developer, and React Native mobile projects across fintech, aviation, and Web3.
Send me a direct message to receive a consultation.
I deliver native and cross-platform mobile app development for startups and enterprises. Whether you need an iOS developer, an Android developer, or a React Native mobile solution that runs on both — we cover the full spectrum.
Native development:
— iOS development (Swift) — performance-critical, security-first apps
— Android app development (Kotlin) — scalable, production-grade Android apps
Cross-platform:
— React Native mobile — single codebase, native performance, faster time to market
— Flutter — smooth UI, strong for consumer-facing apps and MVPs
What we build:
— Fintech and crypto mobile apps with AML/KYC and hardware-level encryption
— E2E encrypted messengers with built-in crypto wallets
— Booking and marketplace mobile apps
— DeFi and Web3 mobile applications
— Mobile app design and UI/UX for intuitive user experiences
— Backend integration: Node.js, Python, PostgreSQL, AWS
Backed by a 45-engineer team with a live portfolio spanning iOS developer, Android developer, and React Native mobile projects across fintech, aviation, and Web3.
Send me a direct message to receive a consultation.
Platform
iOSApp Type
Native AppDevelopment Technology
React Native, Kotlin, SwiftApp Purpose
Blockchain, Chat, Cryptocurrency, Delivery, Finance, Entertainment, Education, Health & Fitness, IoT, Maps & NavigationExpertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$295
|
Standard
$4,995
|
Advanced
$19,995
|
|---|---|---|---|
| Delivery Time | 5 days | 30 days | 70 days |
Number of Revisions | 1 | 1 | 1 |
Number of Mobile Operating Systems | 2 | 2 | 2 |
App Store Upload | - | - | |
App Icon Design | - | - | |
Splash Screen | - | ||
Ad Network Integration | - | ||
Source Code |
30 reviews
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DC
Daniel C.
Apr 1, 2026
Javascript (ES6, Vue.js 2, Node.js) developer for Stock/Forex Charting Platform
Olexsandr and his team provided a huge range of problem solving skils , delivered quality robust solutions in an efficient and timely manner - would highly recommend them.
JR
Joe R.
Dec 24, 2025
Full-Stack JavaScript Developer to Build Financial Webapp
I recently had the pleasure of working with the BarvaTech team to develop the backend infrastructure for our investor desk software—a comprehensive platform that streamlines investment tracking, portfolio management, and real-time data analytics for our clients. From the outset, their professionalism shone through, as they took the time to deeply understand our vision: building a robust, scalable backend that could handle secure user authentication, seamless API integrations with financial data providers, efficient database management for handling large volumes of investment records, and automated reporting features to generate insights on market trends and performance metrics. We aimed for a rapid development cycle to meet our aggressive launch timeline, and BarvaTech rose to the challenge by collaborating closely with us to define clear, achievable milestones, such as initial database schema design, API endpoint development, security implementation (including encryption and compliance with financial regulations), and performance optimization for high-traffic scenarios.
What truly set BarvaTech apart was their flawless execution. Each milestone was delivered not just on time, but often ahead of schedule, with impeccable attention to detail that ensured the backend was not only functional but also future-proofed for scalability as our user base grows. For instance, they implemented a microservices architecture that allowed for modular updates without disrupting the overall system, and their integration of caching mechanisms significantly reduced latency in data retrieval—features that have already proven invaluable in our beta testing phase. Throughout the project, communication was exemplary; we received regular updates via detailed progress reports, video calls, and a shared project dashboard, which kept everyone aligned and allowed us to provide feedback in real time without bottlenecks.
Even after hitting our final due date spot-on, BarvaTech went above and beyond with post-delivery support, quickly addressing a couple of minor tweaks and providing thorough documentation and training sessions for our in-house team. Their expertise in backend technologies like Node.js, PostgreSQL, and cloud deployment made the end product reliable, secure, and performant, exceeding our expectations in every way. If you're looking for a team that delivers high-quality work with reliability and enthusiasm, I can't recommend BarvaTech highly enough—they're true partners in turning ambitious ideas into reality!
What truly set BarvaTech apart was their flawless execution. Each milestone was delivered not just on time, but often ahead of schedule, with impeccable attention to detail that ensured the backend was not only functional but also future-proofed for scalability as our user base grows. For instance, they implemented a microservices architecture that allowed for modular updates without disrupting the overall system, and their integration of caching mechanisms significantly reduced latency in data retrieval—features that have already proven invaluable in our beta testing phase. Throughout the project, communication was exemplary; we received regular updates via detailed progress reports, video calls, and a shared project dashboard, which kept everyone aligned and allowed us to provide feedback in real time without bottlenecks.
Even after hitting our final due date spot-on, BarvaTech went above and beyond with post-delivery support, quickly addressing a couple of minor tweaks and providing thorough documentation and training sessions for our in-house team. Their expertise in backend technologies like Node.js, PostgreSQL, and cloud deployment made the end product reliable, secure, and performant, exceeding our expectations in every way. If you're looking for a team that delivers high-quality work with reliability and enthusiasm, I can't recommend BarvaTech highly enough—they're true partners in turning ambitious ideas into reality!
LP
Luke P.
Nov 10, 2025
Next.js Developers Needed for Web Application(TypeScript, Tailwind, Prisma, PostgreSQL, Alchemy)
Working with Olek and the rest of the Barva Technologies Team was great. Our project manager, Kat was extremely knowledgable, prompt, and got us through to project launch on time and on budget. We highly recommend the Barva Tech team to any size project, and we will definitely be working with them again in the future. Thank you.
KS
Kate S.
Sep 3, 2025
Investment Management App Development
Worked with Oleksandr and his team on an investment app, and honestly, they were awesome. I wasn’t sure if some of the stuff I wanted was even possible, but they made it happen – FactSet integration, Excel uploads, reports, calculations, everything works. Communication was easy, they were patient with my random ideas, and the final result is way better than I expected. Definitely would work with them again.
IH
Ismeli H.
Aug 12, 2025
Full-Stack Developer Needed for Cross-Broker Automated Trading App (Sigmavue)
Olekasndr And his team was great. Went above and beyond to help us get to a good point in our software. Will defiantly be working with them again once we scale. Great people and really care about their clients.
Work on great schedual and very moldable to any business proactive and operations. We had many niche issues with our app and him and his team were able to figure them out and solve them.
Highly recommend
Work on great schedual and very moldable to any business proactive and operations. We had many niche issues with our app and him and his team were able to figure them out and solve them.
Highly recommend
About Oleksandr
Full Stack Developer React / Mobile App Development / AI Developer /PM
100%
Job Success
Tel Aviv, Israel - 3:46 pm local time
I'm a full stack developer and software architect based in Israel, and the CEO of a 40+ engineer development agency. When you work with me, you get a senior technical partner who understands the code and the product — and a full team behind delivery when scope requires it.
🔹 Full Stack & SaaS Development
Scalable multi-tenant architectures, B2B dashboards, internal tools, and AI-integrated SaaS. Core stack: React, Next.js, Vue.js, TypeScript, JavaScript, Python, Node.js, Laravel — full stack web developer depth from database schema to UI.
🔹 Fintech & Banking
This is where I'm different from most full stack developers on this platform. We've built card issuing systems, treasury management platforms, AML/KYC pipelines, cross-border payment rails, and crypto-to-fiat flows. Live integrations: BlackRock, DocuSign, Salesforce, Rail API, Kraken, SEPA Instant. Production experience, not theoretical.
🔹 Mobile App Development
Native iOS (Swift) and Android (Kotlin) for security-critical applications. React Native for cross-platform. My mobile portfolio includes a hardware-encrypted messenger with a built-in crypto wallet, a DeFi app, and a React Native aviation booking system — real-world apps built for real stakes.
🔹 Web3 & Blockchain
EVM smart contract UIs, DeFi protocols, hardware-encrypted crypto wallets, seed-to-sale blockchain tracking, multi-chain no-code contract execution, tokenization platforms.
🔹 AI Integration
LLM integrations, OpenAI API, RAG pipelines, multi-agent workflow automation, Fathom AI analytics, ClickHouse data infrastructure. I build AI as a functional product layer, not a feature checkbox.
When you hire me as your full stack developer, you're not getting a solo freelancer bottleneck. You're getting a senior technical lead with backend, frontend, mobile, and DevOps teams — all behind one
point of contact, one contract.
Tech: Python · Django · FastAPI · React · Next.js · Vue.js · TypeScript · JavaScript · Node.js · Swift · Kotlin · React Native · PostgreSQL · MySQL · Redis · ClickHouse · AWS · GCP · Docker · Kubernetes · Solidity · Web3.js
Send me a direct message to get 30-minute session to map your architecture, align on tech stack, or define your MVP roadmap before development begins.
Steps for completing your project
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Delivery time starts when Oleksandr receives requirements from you.
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Revisions may occur after the delivery date.
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