Clients don't pay for code - they pay for results. That's what I focus on.
I help startups and product teams deliver high-quality iOS apps - on time, with clean architecture and measurable results.
Over 7 years, I've built and shipped 20+ native iOS applications across fintech, healthcare, CRM, and edtech. I work across the full cycle: from scratch builds to legacy upgrades, bug fixes, and team coordination as a tech lead.
What I've delivered:
- Built 20+ production apps used by real customers across 4 industries
- Helped teams reduce development friction by leading designers, backend devs, and QA
- Delivered clean, scalable codebases using Swift, SnapKit, Firebase, and REST APIs
- Converted Figma designs into pixel-perfect, performant UIs
- Helped clients ship faster by establishing Agile workflows and JIRA-based task management
Domains where I've driven results:
- Fintech - banking, payments, card and account management
- Healthcare & Wellness - activity tracking, reminders, sleep analytics
- CRM - client management tools for service businesses
- EdTech - interactive lessons, progress tracking, engagement features
If you need an iOS developer who takes ownership and delivers - let's talk.
Main technology stack
UI: Swift, SwiftUI, UIKit, SnapKit, Interface Builder
Networking & backend: REST API, Firebase (Database, Storage), Alamofire, Swagger, Realm
AI: ChatGPT API, Apple Intelligence, Google Gemini Analytics: Google Analytics, Firebase Crashlytics, Google Tag Manager
Maps: Google Maps, Apple Maps
Social integrations: Firebase Auth, Facebook, VK, Instagram
Subscriptions & Paywalls: StoreKit 1, StoreKit 2, RevenueCat Version control: GitHub, GitLab, Bitbucket
Other: APNs, StoreKit, Firebase Messaging, Photoshop, Figma, Postman
iOS Development
iPhone & iPad Apps
Apple Xcode
iOS
iPad App Development
Objective-C
Swift
tvOS
SwiftUI
Mobile App Development
In-App Purchases
In-App Subscription
In-App Advertising
Firebase
UIKit
Push Notifications
REST API
Mobile Development Framework
Apple Watch
AI Mobile App Development
Relja B.
Belgrade, Serbia
$60/hr
5.0
13 jobs
Founder, full-stack & AI engineer with 12 apps live on the App Store, 4,000+ users, and a Top Rated profile with 100% Job Success.
I'm not just a developer for hire. I build, ship, and operate my own AI-powered products end to end, and I bring that same founder-level ownership to every client project. From fintech platforms with real bank connections to AI-powered wellness, health, and productivity apps, I design the user experience, engineer the backend, integrate the AI, implement monetization, and take products all the way to launch, App Store or web.
What I bring to your project:
⌁ AI Engineering
Production AI, not demos: multi-model systems across OpenAI, Claude, and Gemini with cost-tiered model routing, agent pipelines, and vision, voice, and reasoning features grounded in real user data, engineered for reliability, latency, and cost.
⌁ Full-Stack Development
I build the entire system, includth FastAPI and PostgreSQL, as well as Firebase and Supabase for authreal-time synchronization, and server-side logic, plus Next.js hboards.
⌁ iOS & Apple Ecosystem
Modern, modular Swift & SwiftUI (rk, Swift Concurrency) withpixel-perfect, first-party-qualiteMotion and AirPods sensor data,FamilyControls and Screen Time APs, Apple Watch, and macOS.
⌁ Fintech & Monetization
Experience with Plaid integration2 subscriptions, and RevenueCat paywalls, with secure token manag
⌁ Security-First Engineering
Hardened authentication flows, sege, and a clean App Store submission history with zero secuing I've shipped.
Clients consistently highlight th
• Translate complex product ideasiences.
• Deliver quickly without sacrifi
• Communicate clearly, set realis ownership of delivery.
I approach every engagement as a task executor because I thinkabout your users, conversions, anof care I bring to my ownproducts.
iOS
Framer
Aleksei N.
Belgrade, Serbia
$35/hr
5.0
3 jobs
🚀 Delivered 16+ projects since 2019, AI integration since 2023. My clients get manual workflows replaced with automation and AI - up to 40% faster response, 20+ hours saved monthly. Glad to build yours next!
🔴 Backend Developer | Node.js | Python | TypeScript
🔴 Founder-led studio based in Belgrade, in-house team
🔴 12 years in IT consulting & business analysis
🔴 Thinking like a product owner, not just a coder
🔴 My clients return with new projects - that's how we measure quality
CLICK MESSAGE to get a free mini-audit of your workflow 📩
My goal is simple: find what's eating your team's time and build the backend that replaces it - on time, on budget, with a 6-month warranty.
🎯 Need a Backend Developer who builds with Node.js, Python, and TypeScript? As a Backend Developer, I've built REST APIs, database architectures, automation backends, and data pipelines. Every Backend Developer project starts with discovery - we figure out what you actually need before code. Whether you need a Backend Developer for your API, a Python Developer for data pipelines, or a Node.js Developer for automation - you get a written spec, transparent budget, and weekly updates.
WHAT I BUILD
➡️ BACKEND DEVELOPMENT
As a Backend Developer, I build systems with Node.js, Python, and TypeScript. REST APIs, database design, authentication, webhooks, background jobs. Every Backend Developer project built for reliability. PostgreSQL, MongoDB, Docker, CI/CD. A Backend Developer who thinks like a product owner, not just a coder.
➡️ PYTHON DEVELOPMENT
As a Python Developer, I build data pipelines, web scraping systems, ETL workflows, and automation backends. Selenium, Pandas, Google Sheets API. Every Python Developer project delivers structured output from messy inputs. Scheduled extraction, data processing, report generation.
➡️ NODE.JS DEVELOPMENT
As a Node.js Developer, I build REST APIs, webhook handlers, automation backends, and SaaS platforms. Express, Koa, TypeScript. Every Node.js Developer project built with clean architecture and documentation. Payment integrations, multi-tenant systems, real-time processing.
➡️ AI INTEGRATION
RAG systems, AI agents, GPT/Claude API - integrated into Node.js and Python backends. As a Backend Developer, I wire AI into your API. AI that answers from your data, never invents. Structured outputs, human-in-the-loop, anti-hallucination guardrails.
➡️ AUTOMATION
Business process automation with Node.js and Python. Web scraping, data pipelines, report generation, scheduled tasks. Automation that replaces 10-20 hours of manual work per week.
TECHNOLOGIES I USE:
➡️ BACKEND
Node.js, Python, TypeScript, PostgreSQL, MongoDB, Docker, REST APIs, Webhooks, Koa, Express. Every Backend Developer tool needed for production systems.
➡️ AUTOMATION & SCRAPING
Selenium, Playwright, Google Sheets API, Pandas, Apache POI, cron. Python and Node.js for data extraction and ETL pipelines.
➡️ AI & LLM
OpenAI API, Claude API, RAG systems, AI agents, pgvector, prompt engineering.
➡️ DEPLOYMENT
Docker, Nginx, CI/CD (GitHub Actions), VPS, Railway.
DOMAINS & PRODUCTS I BUILD:
SaaS backends, internal tools, admin panels, data pipelines, RAG chatbots, AI agents, workflow automation, web scraping platforms.
My projects focus on measurable outcomes: 40% faster response times, 20+ hours saved monthly, 10+ hours saved weekly, zero lost leads.
Technologies we bring to projects: Backend Developer, Node.js Developer, Python Developer, TypeScript Developer, API Developer, PostgreSQL Developer, MongoDB Developer, Docker Developer, AI Integration Developer, Automation Developer, Web Scraping Developer, Data Pipeline Developer, ETL Developer, Backend API Developer, Node.js Backend Developer, Python Backend Developer.
MESSAGE me "BACKEND" and get a free mini-audit of your workflow 📩
Back-End Development
Python
Node.js
JavaScript
TypeScript
Automation
Artificial Intelligence
AI Agent Development
Chatbot Development
Telegram API
Web Scraping
Bot Development
Business Process Automation
API Integration
PostgreSQL
MongoDB
Payment Gateway Integration
OpenAI API
Large Language Model
Google Sheets Automation
Egor D.
Novi Sad, Serbia
$150/hr
5.0
11 jobs
• 20 years in development • 50+ shipped products – from startups to Fortune 500 • MVPs built from scratch to App Store • 300K+ active users in the 1ˢᵗ year, $16M Series B • Full-cycle development • Transparency, reliability, ownership.
I help businesses carry their projects from idea to the App Store and beyond; craft MVPs that attract investors; build full app infrastructures; and win users through thoughtful design, usability, visual aesthetics, and performance.
With a strong IT foundation grounded in higher mathematics, 20+ years of software engineering experience, and broad expertise across technologies, frameworks, and app types, I identify potential pitfalls early, offer strategic recommendations, and handle the full cycle of research, development, and long-term support — ensuring your app not only works, but works deeply well.
Fair play, clear communication, solid responsibility, and high-quality output are included.
🔬 𝗙𝗢𝗖𝗨𝗦 𝗔𝗥𝗘𝗔𝗦
⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
• Mobile business applications
• Location-based services and systems (LBS)
• AI-enabled solutions, AI agents & workflows
• Extended & augmented reality (XR & AR)
• Startups; rapid MVP development.
🎾 𝗦𝗘𝗥𝗩𝗜𝗖𝗘𝗦 & 𝗘𝗫𝗣𝗘𝗥𝗧𝗜𝗦𝗘
⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
• Product discovery & scoping (requirements, research, cost/time estimation)
• Technical due diligence & audits
• System, data & mobile architecture
• Geospatial features & location intelligence (geofencing, routing, map UX)
• AI/LLM & agentic flows (on-device; GPT APIs integration, LangChain/LlamaIndex)
• Data modeling, database design & integration
• APIs, backend & cloud/PaaS integration (AWS, GCP, Firebase, Supabase, Cloudflare)
• Identity & access management (native/federated; Cognito/Firebase/Supabase Auth)
• End-to-end iOS development (apps, widgets, extensions)
• Monetization (in-app purchases, subscriptions, ads)
• Hardware integrations (Bluetooth, camera, sensors, location)
• UX design & usability optimization
• Localization & internationalization (incl. RTL)
• CI/CD & release engineering
• Performance, reliability & observability
• Documentation, handover & post-launch support.
🗂️ 𝗕𝗔𝗖𝗞𝗚𝗥𝗢𝗨𝗡𝗗
⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
• Systems analyst at Accenture, Intesa Sanpaolo & Renaissance Capital in the past
• Ex-PL/SQL, C/C++ full-time developer (fintech & state property security)
• MS in Applied Mathematics & Computer Science.
🧰 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 & 𝗧𝗢𝗢𝗟𝗦 (𝗞𝗘𝗬𝗪𝗢𝗥𝗗𝗦)
⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
• Swift, Objective-C; SwiftUI, UIKit; Combine, modern concurrency, async/await, actors, GCD, OperationQueue;
• AI, large language models (LLM), machine learning (ML) integration; OpenAI, LangChain, LlamaIndex, Zapier integration; AI agents; geospatial services, location-based services (LBS);
• SQLite, SQLite, PostgreSQL, PostGIS, CoreData, SwiftData; SQL, PL/pgSQL; Keychain, Secure Enclave;
• CoreLocation, CoreBluetooth, AVKit, MapKit, ARKit, RealityKit, CoreML, StoreKit, SpriteKit, Speech, WeatherKit; RevenueCat, MapBox, Bloomreach;
• MVVM, MVP, MV*, TCA, Clean Architecture, dependency injection (DI);
• background tasks, push notifications (APNs, FCM, SNS), widgets, app extensions; Swift Package Manager (SwiftPM), CocoaPods (pods);
• Firebase (Auth, Remote Config, Analytics, Crashlytics, FCM, App Check, Distribution), AWS (Cognito, S3, SNS, Lambda, API Gateway, RDS), Supabase (Auth, Database, Edge Functions, Storage); Cloudflare R2 Storage; Mapbox; RevenueCat;
• REST API, WebSockets; JSON, GraphQL; OpenAPI/Swagger; JSON Web Tokens (JWT); XMPP;
• Swift Testing, XCTest, Appium, OCMock;
• Xcode Instruments, VSCode, Antigravity, Docker, profiling, optimization, CI/CD (GitHub Actions, CircleCI; Fastlane); App Store Connect, TestFlight; Git (GitHub, GitLab, Bitbucket), SVN; Figma, Pixelmator; Notion, Jira, Linear; ngrok; Postman; pgModeler, pgAdmin, DataGrip, DBeaver; VS Code; Sentry, Zabbix; Mixpanel.
iOS Development
Objective-C
Swift
Algorithm Development
UX & UI
Geolocation
Bluetooth
SwiftUI
Firebase
Database Design
API Development
AI Mobile App Development
Amazon Web Services
Predrag B.
Novi Sad, Serbia
$45/hr
5.0
10 jobs
Results-oriented, organized, collaborative, and highly skilled iOS developer with 7+ years of experience and a strong sense of ownership.
Responsible for the entire development process, from the creation of the idea, creating a development strategy, product MVP development, testing, all the way to the final release of the application on the App Store and further maintenance.
I am constantly striving to learn new technologies and look for ways to better myself in this rapidly changing industry.
iOS Development
Apple Xcode
iOS
iPadOS
Objective-C
Swift
SwiftUI
RealityKit
UIKit
Milan D.
Nis, Serbia
$40/hr
5.0
29 jobs
IT inspired, problem-solving oriented and efficient undergraduate from the Faculty of Electronic Engineering.
Professional towards job responsibilities with excellent communication and organizational skills. Self driven, able to work both in a team and independently. Currently completing final year at university with experience in web development, mobile development and programming in general. Ready to invest time and knowledge in order to provide the best possible solutions for my clients.
API Integration
HTML5
RESTful Architecture
CSS 3
WordPress
PHP
MySQL Programming
JavaScript
Vue.js
Web Application
UX & UI
Laravel
API Development
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