Jobs Mobile

Senior Mainframe Assembler Developer (HLASM / z/OS)

Project Details

• Location: Central & Eastern Europe
• Workload: Full-time
• Duration: Long-term

• Rate: $23–25/hour (B2B)

   

We are looking for an experienced Senior Mainframe Assembler Developer to join a long-term project focused on developing, optimizing, and maintaining low-level applications within an IBM mainframe environment.

The role requires deep expertise in HLASM, IBM z/OS, system-level debugging, and performance optimization.

Responsibilities

• Develop, maintain, and optimize Mainframe Assembler (HLASM) code.
• Analyze complex system requirements and implement reliable low-level solutions.
• Debug production issues, analyze system dumps, and resolve critical incidents.
• Optimize application performance, memory usage, and I/O operations.
• Integrate Assembler modules with COBOL, PL/I, and Java applications.
• Work with IBM mainframe technologies, including z/OS, CICS, IMS, and DB2.
• Troubleshoot system-level issues using IPCS, SYSUDUMP, and specialized debugging tools.
• Collaborate with technical teams and stakeholders to ensure system stability.
• Participate in code reviews, technical documentation, mentoring, and knowledge transfer.

Requirements

• 7–10+ years of professional Assembler development experience, including at least 5 years working with mainframe systems.
• Strong hands-on expertise in HLASM (High Level Assembler).
• Deep understanding of IBM mainframe architecture, instruction sets, and macros.
• Strong experience with IBM z/OS, MVS, CICS, IMS, and DB2.
• Knowledge of VSAM, GDGs, and JCL.
• Understanding of memory management, I/O operations, and interrupt handling.
• Experience with low-level debugging and dump analysis using IPCS and SYSUDUMP.
• Familiarity with IBM Debug Tool, Abend-AID, OMEGAMON, or Fault Analyzer.
• Experience integrating Assembler modules with COBOL, PL/I, or Java.
• Understanding of APIs, MQ messaging, and middleware.
• Strong analytical, troubleshooting, and problem-solving skills.
• Good communication skills and experience supporting knowledge transfer.

Nice to Have

• IBM Certified System Programmer certification.
• IBM z/OS Mastery certifications.
• Experience mentoring other mainframe developers.

If you have extensive hands-on HLASM expertise and enjoy solving complex system-level challenges within IBM mainframe environments, we'd be happy to hear from you!

Cropwise Operations is part of Syngenta Digital, the technology arm of one of the world’s largest agriculture companies. We build mobile apps that help agronomists across 50+ countries plan planting, protect crops, and manage harvest. They run on satellite data and machine learning, and they work fully offline.

We’re looking for a skilled iOS Engineer to join our team. You’ll work on geolocation-heavy features, offline-first architecture, and performance-critical components that help farmers around the world make better decisions.

Must-Have Skills

• Swift
• UIKit
• SwiftUI
• Swift Concurrency (async/await)
• 3+ years of commercial iOS development

Nice to Have

• You enjoy data-heavy apps and keeping backend, database, and UI in sync through local persistence and caching
• Mapbox SDK or other geospatial experience
• Testing with XCTest, Swift Testing, and UI tests
• C/C++ interop or geospatial libraries (GDAL)
• Profiling with Instruments (performance, memory)
• Agentic engineering, using AI agents for refactoring, codebase research, or feature delivery
• CI/CD, build and release automation, scripting

What You’ll Work On

• Developing a mobile application that interacts with a SaaS platform for agronomic data processing
• Integrating with geolocation and mapping services (Mapbox, GPS, etc.)
• Implementing UI components using SwiftUI
• Building and maintaining the offline-first data layer (local storage, caching, synchronization), a core hands-on part of the role
• Keeping the app fast through performance and memory optimization in critical code paths
• Evolving a mature production codebase, including gradual UIKit to SwiftUI migration as part of ongoing architecture work

The Company Offers

• Company-paid subscriptions to AI coding agents and tools
• Continuous learning through training and development programs
• Flexible work format (remote, office, or hybrid)
• Health and life insurance for employees and their family members
• 32 working days of paid annual leave and sick leave

We are looking for flutter developer for our music software

( work in Lviv or Kyiv,

remote work possibility ):

www.MusConv.com

About the project:

MusConv is b2c music software which helps people synchronize their music between music services: Spotify, Apple Music, YouTube Music, Amazon Music, Tidal and others.

We offer:

Challenging interesting project

Professional growth and development program

Flexible schedule

Team of highly talented individuals

Access to developer courses like https://www.pluralsight.com

Mentor: code reviews, studying

We are looking for flutter developer to implement new features

We are looking for an experienced Mobile App Developer to support a project in the financial IT sector, focusing on implementing offline capabilities in an existing mobile application.

Start Date: ASAP
Duration: 6 months (extension possible)
Workload: 80–100%
Location: Remote

Language: German preferred; English-speaking candidates also considered
 

Responsibilities
Gather and analyze business and technical requirements.

Familiarize yourself with technical parameters, particularly security-related requirements.

Align technical requirements with the current versions of MobileIron and iOS 27.

Estimate the effort required for development and implementation.

Implement necessary adjustments within the available project budget.

Must-Have Requirements

Experience in mobile application development.

Knowledge of MobileIron and MDM environments.

Experience with security-related requirements.

Knowledge of EWS and Kerberos.

Nice-to-Have Requirements

Experience in the financial IT sector.

Experience with offline scenarios.

Knowledge of Exchange and VPN access.

Критично досвід з:

MobileIron / Ivanti MDM

MDM environments (Microsoft Intune, Samsung Knox, -Workspace ONE or similar)

EWS (Exchange Web Services)

Kerberos authentication

Microsoft Exchange and VPN integration

Enterprise mobile security requirements

Offline functionality and data synchronization

Company Overview

We're a pioneering company transforming business needs through innovative solutions for our exclusive client. Our mission is to deliver informative SaaS products that align with modern design solutions and cutting-edge technologies.

Role Overview

We’re on the hunt for an ambitious and curious Trainee React Native Developer who is eager to kickstart their career in mobile development and passionate about exploring modern technologies and AI-powered development tools.

In this role, you won’t just learn how to build mobile applications; you’ll have an opportunity to work with React Native, experiment with AI tools, and discover how modern development workflows can make coding more efficient.

Join our vibrant office space, where you’ll work alongside passionate developers and experienced mentors. If you’re excited about building mobile applications, solving technical challenges, and learning something new every day, we’d love to meet you!

🎯 Mission

Master the fundamentals of mobile application development using React Native, learn to build functional and user-friendly interfaces for iOS and Android, and actively explore AI tools to improve your coding workflow and problem-solving skills.

✅ Key Responsibilities

• Assist in developing and maintaining mobile applications using React Native
• Build simple UI components and implement screens based on predefined designs and requirements
• Work with JavaScript / TypeScript to write clean, readable, and maintainable code
• Learn how to integrate REST APIs and handle data within mobile applications
• Use AI tools (such as Claude and ChatGPT) to explore technical solutions, generate code suggestions, debug issues, and accelerate development tasks
• Collaborate with experienced developers to understand best practices and development workflows
• Participate in code reviews, team discussions, and brainstorming sessions

• Fix basic bugs and gradually take ownership of small development tasks

   

🛠 Requirements

• Basic knowledge of JavaScript and understanding of fundamental programming concepts
• Familiarity with React: components, props, state, and hooks
• Basic understanding of React Native or strong motivation to learn mobile development
• Understanding of HTML, CSS, and responsive design principles
• Basic knowledge of Git and version control fundamentals
• AI curiosity – willingness to experiment with Claude, ChatGPT, and other AI tools to solve development tasks
• Strong logical thinking and problem-solving skills
• Eagerness to learn quickly and handle constructive feedback professionally

• English level: Upper-Intermediate or higher – comfortable reading technical documentation, using English-language AI tools, and communicating with the team

   

🌟 Nice-to-Haves

• Educational, personal, or pet projects built with React or React Native
• Basic understanding of TypeScript
• Familiarity with Expo
• Experience working with REST APIs
• Basic knowledge of asynchronous JavaScript (Promises, async/await)
• Understanding of mobile application development principles for iOS and Android
• Experience with AI-powered development tools and Prompt Engineering

• A GitHub profile with personal or educational projects

   

Collaboration Format

• Full-time (on-site)
• Work closely with experienced React Native developers who will provide guidance and mentorship
• Collaborate with the development team on real commercial projects

• Clear growth path to transition into a Junior React Native Developer role

   

What We Offer

• Dedicated mentorship and hands-on training with real commercial projects
• An opportunity to develop your skills in modern mobile technologies
• Practical experience with React Native and the latest AI-powered development tools
• A supportive environment where asking questions, experimenting, and learning are encouraged
• Regular feedback and guidance from experienced developers

• Competitive starting compensation package for entry-level positions

   

Even if your experience doesn’t perfectly align with all the requirements, we encourage you to apply. We’re looking for someone with a strong learning mindset, genuine curiosity, and the motivation to grow into a great mobile developer!

Ukraine-based role

Stormotion is a React Native-focused agency. We build mobile products in IoT/BLE, EV & Mobility, Fitness, and HealthTech/Mental Wellbeing. Small teams, direct client communication.

Growth path
Start as a React Native developer. Over time you can add React (web) and grow to Full Stack with Hasura + PostgreSQL + Nest.js.

What you’ll do

• Build and ship React Native apps (TypeScript)
• Turn product goals into working solutions (not just “implement tickets”)
• Keep releases stable - test key flows in real conditions
• Make scope/architecture decisions that won’t block future scaling
• Code reviews, mentoring, workshops (everyone teaches, everyone learns)
• Join client calls: clarify requirements, explain trade-offs, drive discussions
   

Must have

• 1+ year commercial React Native experience
• Strong TypeScript
• Hooks + Context
• State management (Redux / MobX or similar)
• API integration (fetch / axios or similar)
• Spoken English Intermediate+: confident on calls, not only in chat
• Tech education (Computer Science, IT, Cybersecurity, etc)
   

Nice to have

• GraphQL (Apollo Client / Relay / urql)
• Push notifications
• Firebase (Cloud Messaging, Analytics, Firestore, Storage, Authentication, Functions)
• React Navigation
• ESLint / Prettier
• Testing (TDD / Jest / Detox)
• CI/CD (Fastlane / GitLab CI/CD / GitHub Actions)
• Reanimated 3 / React Native Skia
• BLE integrations (react-native-ble-plx or similar)
• Ramda / Lodash / fp-ts or other FP libraries
   

Benefits

• 24 paid vacation days + 10 paid recharge days
• Birthday day-off + Donor day-off
• Remote-first, office option in Dnipro
• Professional study compensation (courses/meetups/webinars)
• Sport & Streamings budgets
• Assistance with taxation PE documentation

Senior Product Engineer (Mobile & Web)

About the Company

Wise Engineering is a software company where 90% of client relationships turn into long-term partnerships, and 70% of the team are senior-level engineers. We're hiring for one of our client products.

About the Project

An AI-powered nutrition platform embedded in the clinical pathway, starting with chronic pain care. Patients use a mobile app to log meals, track symptoms, and chat with an AI nutrition assistant, while dietitians use a web app to build protocols and approve AI-drafted plans. 

About the Role

You will be the only front-end and mobile engineer, owning the patient mobile app and the dietitian web app end to end. You'll shape features together with the Founding Engineer and the Founders rather than wait for a detailed spec, and you'll see quickly how patients and dietitians respond to what you ship. Over six months, the role can grow into owning core AI features and protocol tools.

Responsibilities

Dietitian web app

• Improve the clinician workflow: session notes, recipe library, and the front end for AI-assisted protocol generation
• Build review-and-approve flows for AI-drafted protocols

Patient mobile app (iOS and Android)

• Own mobile releases to the App Store and Google Play (ramp-up on the release process is supported during the first month)
• Improve the UX around wearables integration, Voice AI features (UI), weight tracking, and recipe / grocery list navigation
• Suggest and drive product improvements, not just implement specs

Engineering

• Set up CI, automated mobile builds, and tests, and ensure HIPAA-grade handling of patient data on the client
• Evolve interactive AI prototypes built by the CEO into production
• Ship fixes and features for the clinics going live in November

Tech Stack

React Native, Expo, TypeScript, React 19, Vite, react-admin, MUI, React Navigation, TanStack Query, Zustand, MMKV, Sentry, Storybook, Style Dictionary, Jest, Vitest, Maestro, Playwright, Claude Code, Cursor, AWS (ECS, ECR, Bedrock), GitHub Actions

Requirements

• 5+ years building production apps with React Native and TypeScript
• Experience shipping to the App Store and Google Play (hands-on release experience is a plus; we'll help you ramp up)
• Strong React web experience (React 19, Vite; react-admin or MUI is a plus)
• Experience building UIs on top of AI services: streaming responses, slow or failed generations, review-and-approve flows
• Daily, fluent use of AI coding tools, and comfort vibe-coding a prototype with a non-engineer founder
• Strong product instinct: you turn a conversation into a good feature without a detailed spec

Nice to Have

• HealthKit or Health Connect (wearables integration is on the roadmap)
• Owning AI features end to end (prompts, model choice, quality checks), with a shipped LLM feature you can show
• Healthcare or regulated-data experience (HIPAA, GDPR) and accessibility (WCAG)
• Mobile CI/CD (EAS, fastlane, GitHub Actions)
• Design systems, Storybook
• Early-stage startup experience

Experience & Soft Skills

• English C1 or higher: fluent written and spoken, and you enjoy live brainstorming on calls
• Proactive communicator: confirms priorities, flags trade-offs early, sends a short weekly written update
• Autonomous and comfortable with ambiguity: you propose solutions rather than wait for a ticket
• Optimistic about AI: you believe models can generate strong drafts and you design the review flows that make them safe
• Available until 9 pm Kyiv time to overlap with the US team

Phoenix Games is an innovative technology company building next-generation iGaming and Web3 products for a global audience. We combine AI, blockchain, and cloud technologies to create engaging, secure, and high-performance digital experiences.

We're looking for a talented iOS Developer to help build world-class mobile applications that deliver exceptional user experiences and support millions of users worldwide.

What You'll Do

• Develop and maintain native iOS applications using Swift.
• Build scalable, secure, and high-performance mobile solutions.
• Collaborate closely with Product Managers, Designers, Backend Developers, and QA Engineers.
• Integrate REST APIs, WebSockets, and third-party SDKs.
• Optimize application performance, stability, and responsiveness.
• Write clean, maintainable, and well-tested code.
• Participate in code reviews and technical discussions.
• Contribute to application architecture and continuous product improvements.
• Stay up to date with the latest iOS technologies and best practices.

Requirements

• 3+ years of commercial iOS development experience.
• Strong knowledge of Swift.
• Experience building and maintaining native iOS applications.
• Experience with SwiftUI and/or UIKit.
• Experience integrating REST APIs.
• Understanding of mobile architecture patterns.
• Experience with Git.
• Strong problem-solving skills and attention to detail.
• Upper-Intermediate English or higher.

Nice to Have

• Experience in iGaming, FinTech, or high-load consumer applications.
• Experience with real-time features and WebSockets.
• Familiarity with Web3 or blockchain technologies.
• Experience with automated testing and CI/CD.
• Experience publishing applications to the App Store.

What We Offer

• Fully remote work from anywhere in Europe.
• Long-term B2B cooperation.
• Competitive salary paid in EUR or USD.
• Annual salary reviews.
• Performance-based bonus program.
• Annual company bonus.
• 25 paid vacation days.
• Paid sick leave.
• Flexible working hours.
• Home office budget.
• Laptop or equipment allowance.
• Learning & development budget for courses, certifications, books, and conferences.
• English language lessons.
• Private health insurance.
• Mental health support program.
• Sports and wellness compensation.
• Team-building activities and international company retreats.
• Opportunity to work on innovative AI, Web3, and mobile products with a global audience.
• Career growth opportunities in a fast-growing international product company.

Why Join Phoenix Games?

At Phoenix Games, you'll build modern iOS applications using the latest technologies in a collaborative, product-focused environment. You'll have the opportunity to influence product decisions, solve challenging technical problems, and contribute to innovative solutions that shape the future of digital entertainment.

Location: Barcelona or Remote (EU Only) !!!
Employment: Full-time, B2B
Start: January 1, 2027!!!!!
Duration: 6 months
Work format: Fully Remote / Barcelona

About the Project
We are looking for a Senior Android Developer to join an international project focused on developing and maintaining modern Android applications using Kotlin and Jetpack Compose.

 Key Responsibilities:

• Develop and maintain Android applications using Kotlin and Jetpack Compose.
• Build scalable UI components and implement clean architecture.
• Integrate REST APIs, Firebase, AWS, and third-party services.
• Optimize application performance and troubleshoot production issues.
• Write unit and integration tests, conduct code reviews.
• Collaborate with cross-functional teams in an Agile environment.

Technical Requirements:

• Strong experience with Kotlin & Jetpack Compose.
• Koin DI & Room Database.
• Firebase & AWS.
• Contentful CMS & PhraseApp.
• Instabug for bug reporting.
• Splunk & New Relic for monitoring.
• REST API integration.
• GitHub, Jira & Confluence.
• Unit & integration testing.

Soft Skills:

• Strong English communication skills.
• Excellent problem-solving abilities.
• Experience working in Agile teams.

Currently, we are looking for a Senior Full Stack Mobile Developer to join our client's team. The expert who can build modern mobile products end-to-end: from the mobile app experience to backend services, APIs, cloud services and production quality. This role is for someone who enjoys solving real product problems, writing clean code, learning new technologies and using AI tools to work faster and better. 

You will join a team building next-generation digital financial products used by customers at scale. You will work across the mobile app, shared mobile logic, backend services and production systems.

What you will do:

• Build and improve mobile features used by real customers.
• Develop shared business logic for mobile platforms, mainly using Kotlin Multiplatform (KMP).
• Build backend services and APIs using Java/Kotlin and Spring Boot.
• Work with cloud services, CI/CD pipelines, monitoring and production support.
• Improve performance, reliability, security and user experience.
• Use AI coding tools to help with development, testing, documentation and troubleshooting.
• Work closely with product, design, architecture, security and platform teams.

• Help define good engineering practices and mentor other developers.

   

What we are looking for

• We are looking for a strong engineer, not just a person who knows one framework. KMP experience is a strong advantage, but it is not the only path into this role.
• Strong experience in mobile application development.
• Deep understanding of iOS & Android Architecture Components.
• Strong Kotlin skills and good understanding of modern mobile architecture.
• Experience building production-grade apps with good quality, performance and maintainability.
• Backend development experience with Java 7+ and Spring Boot.
• Understanding of APIs, microservices and event-driven systems.
• Experience with CI/CD, automated testing and production systems.
• Ability to take ownership of a feature from design to production.

• Good communication skills and ability to work with multiple teams.

   

Cross-platform experience

• Our strategic direction is Kotlin Multiplatform, because it lets us reuse business logic while still keeping native-quality mobile experiences. However, we also welcome candidates with strong experience in other cross-platform technologies.
• Kotlin Multiplatform (KMP) experience is preferred.
• Flutter experience is relevant, especially if you worked on architecture, shared logic and production apps.
• React Native experience is relevant, especially if you worked on platform integration and complex mobile products.
• If you are strong in Flutter or React Native and willing to learn KMP, we want to talk to you.

Backend and cloud experience

• Java 7+ and/or Kotlin backend development.
• Spring Boot and REST/API development.
• Microservices and distributed systems.
• Kafka or other event-based technologies.
• Cloud services, preferably AWS.
• High-scale or high-availability production systems.

AI-assisted development

• We believe modern software development combines strong engineering fundamentals with the effective use of AI and automation.
• As part of our engineering culture, we follow a Specification-Driven Development (SDD) approach, where clear requirements, technical designs, examples, and tests are used to drive implementation and ensure high-quality outcomes.
• Use AI coding assistants such as GitHub Copilot, Cursor, Claude Code, Gemini Code Assist or similar tools.
• Use AI to help with code generation, unit tests, documentation, refactoring and debugging.
• Critically review AI-generated output and maintain high standards for code quality, security, performance, and maintainability.

• Be open to working with AI agents as part of the development lifecycle.

   

Nice to have

• Experience in fintech, banking, payments or other regulated environments.
• Experience with Apple Pay, Google Pay or wallet/payment integrations.
• Experience building modular mobile apps or shared SDKs/libraries.

• Experience with observability, performance profiling and production incident analysis.

   

Who will succeed in this role?

• A developer who can learn fast and is not afraid of new technologies.
• Someone who understands both product experience and system design.
• A person who can work independently but also collaborate well with others.
• An engineer who cares about clean code, reliability, security and customers.
• Someone who wants to be part of the next generation of AI-empowered full stack development.

In simple terms: we are looking for a strong mobile-first full stack developer who can build customer-facing apps, connect them to strong backend services, learn KMP if needed, and use AI tools as part of a modern development workflow.

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

We are looking for an experienced Senior Flutter Developer to join the development of a new mobile-first SaaS product in the utility services industry.

The project involves building a new application from scratch that will integrate with an existing platform through established backend services and APIs.

The application will help service providers and contractors manage their daily operations, including registration, reporting, and service payments.

This is a hands-on role for a senior engineer who can work independently, make technical decisions, and deliver high-quality solutions in a fast-paced environment.

Key Responsibilities

• Develop a new mobile-first application using Flutter.
• Take ownership of mobile application development from initial setup to delivery.
• Integrate the application with existing backend services and REST APIs.
• Build scalable, maintainable, and high-quality code.
• Collaborate with product, design, and backend teams.
• Identify and resolve technical challenges independently.
• Contribute to technical decisions and application architecture.
• Ensure application performance, stability, and usability.

Requirements

• 5+ years of commercial software development experience, including strong hands-on Flutter experience.
• Solid knowledge of Dart and Flutter framework.
• Experience building and delivering production-ready mobile applications.
• Strong understanding of mobile application architecture and state management.
• Experience with REST API integrations.
• Good understanding of authentication, data handling, and mobile security practices.
• Experience with Git and modern development workflows.
• Ability to work independently with minimal supervision.
• Strong problem-solving and communication skills.

Nice to Have

• Experience with backend development and API implementation.
• Familiarity with cloud services and CI/CD pipelines.
• Experience developing SaaS products.
• Knowledge of mobile payment integrations.

About the Role

We’re a lean product team developing a consumer commerce platform that combines real-time 3D interactions with the purchase of physical products. The product also includes a real-money wallet and operational workflows for order processing and fulfillment.

Our technology stack is built entirely around TypeScript. The engineering team is small and experienced, with engineers working closely with and reporting directly to the CTO, allowing for fast communication and decision-making.

We’re looking for a Senior Mobile Engineer to lead the development of a native mobile application for an existing consumer product with rich, real-time 3D interactions.

You’ll take ownership of the React Native application from initial architecture through production release on both iOS and Android. A major part of the role will be translating an existing interactive web experience into a smooth native product, including animations, gestures, and platform-specific functionality.

This is not a mobile-only position. Engineers are encouraged to own features end to end, including the supporting APIs, asynchronous processing, and database changes. The backend is built with Node.js and TypeScript, so experience working beyond the mobile layer is highly valued.

What You'll Do

• Design and develop the mobile application using React Native, Expo, and TypeScript, from initial setup through App Store and Google Play releases.
• Build high-quality animations and gesture-based interactions using tools such as Reanimated, Gesture Handler, and Skia, with a strong focus on smooth performance.
• Implement payment functionality, wallet-related experiences, and reliable synchronization between client-side state and backend financial records.
• Work with native functionality when required, including push notifications, secure storage, media playback, deep linking, and platform-specific payment integrations.
• Own features across the stack when needed: define API contracts, develop Fastify endpoints and background processes, implement the mobile experience, and add appropriate monitoring and instrumentation.
• Establish and maintain the mobile delivery process, including builds, signing, store submissions, OTA updates, and crash reporting using EAS, fastlane, or similar tooling.

What We're Looking For

• 7+ years of professional mobile development experience, including at least 3 years working with React Native applications released to production.
• Strong TypeScript skills and practical familiarity with Swift and/or Kotlin for debugging, understanding native issues, and implementing platform-specific functionality when necessary.
• Hands-on experience building complex mobile animations and gesture-driven interfaces.
• Understanding of mobile performance and the ability to create responsive, smooth user experiences.
• Practical backend knowledge, ideally including Node.js APIs, relational databases, and asynchronous processing or message queues.
• Ability to take ownership of features beyond the mobile interface and contribute to their server-side implementation is strongly preferred.
• Experience with payments, digital wallets, or other transaction-heavy consumer applications is a significant advantage.

Nice to Have

• Experience with mobile 3D technologies such as Three.js, react-three-fiber, SceneKit, or GPU-accelerated Skia.
• Experience handling complex video and media playback scenarios on mobile.
• Previous experience transforming an established web product into native iOS and Android applications while maintaining a consistent product experience.

Technology Stack: React Native · Expo · TypeScript · Reanimated · Gesture Handler · Skia · Node.js · Fastify · PostgreSQL · RabbitMQ · Zod · pnpm

The Mobalytics mission is to create the ultimate gaming companion, providing powerful tools that enable all players to step up their game and be their best selves.

Over the past few years, we have gone from just servicing League of Legends players to empowering players of different genres through Teamfight Tactics, Diablo 4, Path of Exile 2, and many many more. Millions of players get game advice from Mobalytics every day, and now we want to be in their pocket too.

We're building the Mobalytics mobile app from the ground up, and we're looking for the engineer at its core. This is a hands-on, coder-first role: you'll write a large part of the app yourself and lead by example through your code, architecture and reviews. This isn't porting a website to a phone. It's building something players reach for between matches, in the queue and on the go.

Our Mobile Stack

• React Native with Expo (SDK, Expo Router, development builds)
• TypeScript everywhere
• EAS Build, EAS Submit and EAS Update for builds, store delivery and OTA updates
• GraphQL APIs backed by our Go microservices
• Mixpanel for product analytics

Your Responsibilities

• Build the app's foundation hands-on: architecture, navigation, state and data layer, offline behaviour, theming and a shared component library
• Write and ship features, and set the coding standards and patterns the rest of the squad follows
• Be the React Native reference for the team: review code and pair with React developers as they make the move to mobile
• Make the app feel native on both iOS and Android: performance, animations, gestures, haptics, push notifications and deep links
• Own the mobile release flow (signing, versioning, TestFlight and Play testing tracks, staged rollouts, OTA updates), together with our DevOps team, who handle CI/CD infrastructure
• Work with the Product and design team to decide what a phone does better than a desktop.
   

Your Technical Skill Set

• 5+ years of software engineering experience, with at least 3 years working mainly in React Native
• Shipped and maintained production React Native apps on both the App Store and Google Play. Please include store links in your application. Web React experience alone isn't enough for this role
• Solid React web background, enough to know where web habits break on mobile and to help others avoid those traps
• Hands-on experience with Expo: managed workflow and development builds, Expo Router, config plugins, and EAS Build, Submit and Update
• Strong TypeScript and modern React (Hooks, Suspense, performance profiling)
• Solid understanding of the React Native New Architecture (Fabric, TurboModules) and of when a native module is needed (Expo Modules API is a plus)
• Experience with Reanimated and Gesture Handler, and you care about 60 fps scrolling and smooth transitions
• Experience with GraphQL or REST data layers and caching (Apollo, TanStack Query or similar)
• Familiarity with mobile testing at different levels (Jest, React Native Testing Library, Detox or Maestro)
• Comfortable reading and debugging Swift/Kotlin and Xcode/Gradle builds when something breaks below the JavaScript layer
   

Your Personal Skill Set

• You'd rather open a PR than a slide deck, and you lead with working code
• You enjoy sharing what you know, and a good code review or pairing session is part of the job for you, not a distraction from it
• You want to do a job that means something, and to build things people love
• You speak up when the team is heading down the wrong path
• You are fluent in English. You'll work daily with global stakeholders and cross-functional team members in English.
   

Would be a plus

• Experience building an app from scratch (0 → 1) rather than only maintaining one
• Experience helping web developers move to React Native
• Experience with push notification strategy, in-app purchases or subscriptions
• Native iOS (Swift) or Android (Kotlin) development experience
• We don't care if you're ranked Bronze or Diamond, but familiarity with the games we support helps you understand what our players need
   

What we offer

• Real ownership: you'll shape a product from the very beginning, in a flat organization where good ideas win, not titles
• Fully Remote Job: we've been a remote company from day one
• Flexible working hours: apart from scheduled meetings, we don't have a set schedule or a required number of hours. Mobalytics is about results, not hours spent
• Salary paid in USD, wherever you are in the world
• 15 vacation days + 2 more weeks of company-wide vacation in Dec–Jan + 10 sick days

If you love games and want to build a mobile product for passionate communities of competitive gamers, this is the place for you.

Our client US based IT product company is looking for Frontend Developer (Middle).

Required Skills
 

• React + TypeScript  — comfortable reading and extending a large existing component tree, not just building from scratch
• State management (Redux or similar) — actions/reducers/selectors pattern, able to trace state through a store that mirrors the app/feature structure
• State/data flow debugging — trace a bug from UI component → container → action → API call → reducer → back to UI
• REST API integration — read API contracts, wire up fetch calls, handle loading/error states, work against Swagger-documented endpoints
• Component libraries / CSS-in-JS — comfort mixing multiple styling approaches in the same codebase
• Git workflow — feature branches, clean commits, comfortable in a shared codebase with many contributors
• Testing — write and maintain unit/component tests for existing and new features
   

Nice to Have
 

• Modern bundler build/config experience (Vite or similar)
• Client-side routing (nested routes, route-level code splitting)
• i18n / localization tooling
• Experience with data-heavy UI: grids/tables, filters, charts, dashboards
• Error-monitoring integration (Sentry or similar)
• Exposure to AI-powered UI features (streaming responses/SSE, chat-style assistants)
• Enterprise/B2B admin console or security/SIEM/DLP domain background
   

Soft Skills (mandatory)
Self-sufficient, accountable, resilient under pressure. Tasks often arrive without detailed specs against a large, pre-existing codebase — the candidate is expected to navigate ambiguity, follow existing conventions by example, and deliver working, tested features independently.

We are looking for a hands-on iOS Developer to join a funded consumer startup in Sofia. It is building a new kind of app that sits between social video and gaming. The product is already live on the App Store, and you will build and ship features for real users from day one. You will work on a TikTok-style endless feed of mini-games made by users, where performance, smooth scrolling and fast iteration really matter. The role covers the whole feature cycle: quick prototypes, A/B tests, App Store releases and tracking results in mobile analytics. You will work closely with a senior iOS engineer and the leadership team in a small, fast-moving team where your work is seen right away. We want someone who takes ownership, enjoys working on-site with the team and likes to ship often.

Details:

• Schedule: Full time
• Location: Onsite – Sofia, Bulgaria (if you don't live there yet, you need to move to Sofia within about 1 month)
• Start: ASAP
• Duration: Long-term
• English: Fluent
• Type of collaboration: Internal Employment (full-time employment contract; B2B is not possible)

About the project:
The company is a funded consumer startup creating a new category between social video and gaming. Its app has an endless, TikTok-style feed of short mini-games made by users, which people can play, share and create. The product is live on the App Store, and the team is hiring more engineers for its Sofia office. The company works like a typical startup: it prototypes fast, releases often and makes decisions based on experiments and data. Engineers own their features and work directly with product and leadership. It is a great place for someone who wants to shape a fast-growing B2C product that real players use every day.

You have:

• 5+ years of professional iOS development experience
• A track record of shipping production iOS apps to the App Store
• Strong Swift skills and hands-on experience with SwiftUI and UIKit
• Experience with WKWebView and showing web content inside native apps
• Experience with App Store releases, A/B testing and mobile analytics
• Ability to work in a fast-paced startup with quick prototypes and tight deadlines
• An entrepreneurial mindset and a habit of taking ownership
• Fluent English
• EU citizenship or a current Bulgarian/Schengen visa (visa sponsorship is not available)
• You live in Sofia or can move there within about 1 month, and you are ready to work fully on-site

Nice to have:

• Experience building B2C consumer apps
• Experience at early-stage startups
• Experience in iGaming, betting or mobile gaming (including hyper-casual games)
• Experience with social, video or feed-based apps

What to do:

• Build, ship and maintain features for a live consumer iOS app using Swift, SwiftUI and UIKit
• Build and improve the endless mini-game feed, with a focus on performance and a smooth user experience
• Integrate and optimize web-based game content inside the app using WKWebView
• Prototype new ideas quickly and turn the ones that work into production features
• Set up and run A/B tests, and use mobile analytics to measure how features perform
• Own the App Store release process together with the team
• Work closely with the senior iOS engineer, product and leadership on priorities and technical decisions
• Do code reviews and help keep code quality high as the product grows

Interview process:

1. Intro call with the senior iOS engineer
2. Technical interview with the iOS engineer
3. Final round with leadership to discuss the offer (with an optional office visit)