Jobs Kotlin

• ~5 hours per month retainer to guarantee availability.
• Additional work billed hourly at an agreed rate.
• Hours tracked in 30-minute increments with detailed monthly invoices.
• Engagement begins with a trial period; either party may end the relationship with 30 days’ notice.
• We provide QA support and BLE hardware devices for testing.
   

Overview

We are seeking a highly skilled Kotlin Android Developer to provide part-time support, maintenance, and occasional enhancements for a native Android application used by technicians and healthcare personnel to configure IoT devices in hospital environments.

The app is mature and generally stable, but periodically requires bug fixes, SDK migrations, BLE-related troubleshooting, improvements for new Android OS versions, and small feature enhancements. This is not a staff-augmentation role—it's a long-term, low-volume support partnership with predictable monthly work and additional hours billed as needed.

While this is a part-time position, reliability, technical depth, and communication quality are essential. You’ll work asynchronously with our U.S.-based engineering team via Slack, independently diagnose complex issues, and be accountable for delivering high-quality updates.

Responsibilities

Core Maintenance & Support

• Provide technical troubleshooting, bug resolution, and support for a native Kotlin Android app used in the field to configure IoT devices.
• Maintain and improve Bluetooth Low Energy (BLE) communication flows, including GATT interactions, bonding/pairing flows, timeouts, scan failures, and device-specific quirks.

• Diagnose and reproduce BLE behavior using example IoT devices that we will provide.
  (No in-field/on-site debugging required; occasional remote troubleshooting collaboration possible.)

   

Enhancements & Upgrades

• Implement minor feature updates and UX improvements within the existing codebase.
• Maintain and upgrade the application to remain compatible with future Android SDK and AGP versions, including handling breaking changes and new permission models (especially for BLE).

• Support the build & release process using Fastlane and Google Play Console (publishing preferred, preparing artifacts acceptable).

   

Architecture & Code Quality

• Maintain and refine existing Dagger 2 dependency injection structures.
  (We are open to selective improvements but not full rewrites; long-term the app will eventually be replaced with a Flutter-based version.)
• Update and maintain multi-module Gradle configurations, packaging rules, and build troubleshooting.
• Support JSON handling using Moshi, including codegen adapters and serialization logic for device configuration.

• Ensure application stability during Android 12–16 migration cycles, especially around sensitive BLE permission changes.

   

Collaboration & Process

• Participate in an initial onboarding process to learn the codebase, BLE device workflows, build environment, and testing processes.
• Collaborate asynchronously with U.S.-based team members via Slack.
• Provide clear updates, communicate blockers early, and proactively identify potential issues.
• Track all non-retainer time in 30-minute increments and submit detailed monthly invoices.

Core Android Expertise

• Strong Kotlin skills with the ability to work alongside legacy Java components.
• Deep familiarity with BLE, including:
• GATT characteristics & descriptors
• Bonding/pairing flows
• Connection stability, reconnection logic, and timeout handling
• Common production BLE failure modes

• Comfortable working with XML-based UI and/or fragments/activities (Compose experience a plus, but not required).

   

Dependency Injection (Dagger 2)

• Experience with component graphs, subcomponents, modules, and @ Inject usage.

• Ability to safely update or restructure Dagger 2 where needed without large-scale rewrites.

   

JSON Serialization (Moshi)

• Experience with Moshi adapters and codegen (@ JsonClass(generateAdapter = true)).
• Ability to read/write JSON for BLE device configuration and backend interactions.

Jetpack Architecture Components

• Experience with:
• ViewModel
• LiveData
• Lifecycle-aware components

• Structured logging (Timber)

   

• Build System & Project Structure
• Strong Gradle skills (Groovy or Kotlin DSL), including multi-module setups.
• Experience handling AGP migrations, permission changes, and target/min SDK updates.

• Familiarity with Android packaging rules (packagingOptions), manifest merges, and build troubleshooting.

   

• Build & Deployment
• Experience with Fastlane for build automation and store uploads.

• Comfortable preparing or publishing builds in Google Play Console internal/external tracks.

   

• Soft Skills & Working Style
• Strong English communication skills, both written and spoken.
• Consistent availability for asynchronous collaboration via Slack and email.
• Ability to work independently and diagnose issues without extensive guidance.
• Professional, reliable, and disciplined in reporting hours and meeting expectations.

Nice-to-Have Skills

• BLE tooling & sniffers (nRF Connect, SweynTooth knowledge, etc.)
• Experience with device provisioning, IoT workflows, or regulated healthcare environments.
• Familiarity with Flutter (eventual migration could surface collaboration opportunities).
• Experience with backend APIs, authentication flows, or local persistence strategies.

N.B.! Location: remote from Latvia/Lithuania; possible relocation (the company provides support).

JD:
In a partnership with a global consulting partner, we are looking for an experienced Kotlin Developer. The client is a Belgian telecommunication company.

What will you be doing?

You will play a key role in evolving our backend platform as we expand support beyond the Dutch market into Belgium, each with its own functional and regulatory needs.

In this role you will:

Design, build, and optimise backend systems primarily using Kotlin (≈50%) and Spring Boot.

Work extensively in our AWS environment (≈25%), leveraging services such as ECS, ECR, S3, SQS, SNS, AppSync, DocumentDB, DynamoDB, Lambda, API Gateway, Transfer Family, VPC, CloudWatch, CodePipeline, and Terraform.

Develop and maintain GraphQL APIs (≈15%), ensuring efficient and reliable data exchange between our services and clients.

Occasionally contribute to our TypeScript (≈10%) codebases, collaborating with frontend and platform teams when needed.

Continuously develop, test, and release new features in an Agile environment.

Embrace a "you build it, you run it" culture—taking full ownership of the software you deliver, including reliability, performance, and maintenance.

Help shape the architecture of our services and influence engineering standards within the team.

Contribute to a culture of continuous improvement—making systems more robust, scalable, secure, and observable.

Share knowledge, provide technical guidance, and help ensure the platform evolves in a future-proof way.

Must-haves:

Strong experience with Kotlin and Spring Boot.

Solid hands-on experience with AWS, ideally with several of the following:

ECS, ECR, Lambda, S3, DynamoDB, DocumentDB, SQS, SNS, AppSync, API Gateway, VPC, CloudWatch, CodePipeline, and Terraform.

Experience designing and developing RESTful and/or GraphQL APIs.

Familiarity with service-oriented or microservice architectures.

Comfort working in modern, automated CI/CD environments.

Strong focus on security, scalability, and operational excellence.

A proactive, self-driven mindset and the ability to work effectively in complex environments.

Nice to haves:

Experience building highly secure or high-availability systems.

Experience with Akamai or other edge / CDN technologies.

AWS certifications.

Experience with TypeScript in production systems.

Solid Software is currently seeking a skilled Mobile Developer (Android, Kotlin) with Odoo ERP experience to design, develop, and maintain Android applications that integrate with Odoo-based systems.
 

We offer a friendly, progressive, and dynamic work environment that combines modern technologies with inspiring projects.
 

Enjoy the flexibility of a full-time, long-term remote position. Join us in creating exceptional mobile experiences.
 

Apply now to become a vital part of our team!
 

What will you do?

• Collaborate with an experienced team to develop user-friendly, responsive, and high-performance Android applications using Kotlin;
• Integrate mobile applications with Odoo ERP APIs and backend services.
• Support specialized functionality for B2B marketplaces;
• Ensure application security, data integrity, and proper error handling;
• Participate in code reviews, testing, and release cycles;
• Solve complex technical challenges and implement effective solutions;
• Document technical decisions and app features.
• Stay updated on the latest trends, tools, and techniques, and share your newfound knowledge with the team.
   

Requirements:

• 2+ years of experience developing Android applications using Kotlin;
• Hands-on experience integrating mobile apps with Odoo ERP;
• Strong experience with REST APIs, authentication, and data synchronization;
• Experience building clean, scalable, and maintainable Android architecture;
• Solid understanding of Android UI/UX guidelines and best practices;
• Strong focus on code quality, maintainability, performance, and reliability;
• Understanding of application security, data integrity, and error handling best practices;
• Familiarity with Git or similar version control systems;
• Upper-intermediate English (B2): Able to lead meetings and draft reports.
   

Nice to have:

• Experience with Odoo custom modules or ERP-driven workflows;
• Familiarity with mobile app testing and deployment processes;
• Knowledge of CI/CD pipelines for Android applications.
   

Why Solid Software?

• We support Ukraine;
• A wonderful team of enthusiasts and like-minded people;
• Atmosphere of comfortable work & life balance;
• Flexible schedule and work-from-home jobs;
• Opportunity to work on sophisticated B2B solutions that challenge your architectural and coding skills;
• MacBook Pro and great tech;
• Decent compensation;
• Lack of bureaucracy;
• Compensation for professional events, English lessons, sports activities;
• Corporate parties and fun team-buildings;
• Anniversary presents;
• Accounting and juridical services.
   

Professional growth:

• Onboarding and mentorship program;
• Internal career path program from Developer to Architect that consists of knowledge areas for IT specialists, books, training sessions, and work activities;
• Corporate library with the best programming books (+ an ability to order a particular book if we don’t have it);
• Professional and constant feedback.
   

We truly value the unique talents and skills that each individual brings to our company. As we continue on our journey of growth, we eagerly anticipate the opportunity to welcome you into our team.
 

Talk to you soon!

N-iX is looking for a Lead/Senior Kotlin Engineer to join our team.

Our customer is a fintech company that provides flexible buy-now-pay-later solutions, enabling consumers to split purchases into transparent, interest-free, or interest-based payments. The customer's Platform team is responsible for managing critical services that are essential to the success and sustainability of the organisation. In simple terms, the team handles transactional communication send-outs to customers via email, SMS, and push notifications. These services demand attention to detail, proactive maintenance, and swift response times to ensure seamless operations. The recent high-priority initiatives include re-architecture/platform modernisation, high availability, and internationalisation efforts; these are vital for our organisation's growth and competitiveness in the market. These initiatives require dedicated expertise and resources to execute efficiently and effectively.
 

Main Responsibilities:

• Design and develop a robust and extensible Kotlin framework and platform.
• Own and deliver quarterly goals by leading engineers through ambiguity to solve open-ended problems while ensuring team support throughout delivery.
• Collaborate across the product development lifecycle with product management, design, and analytics to participate in ideation and articulate technical constraints.
• Drive decision-making and risk assessment by partnering on strategic technical choices that properly consider trade-offs and business impact.
• Proactively identify and resolve systemic issues across projects, processes, and technology, advocating for and leading the implementation of solutions.
• Ensure operational excellence and availability by creating and monitoring metrics, supporting "keep the lights on" efforts, and participating in an on-call rotation.
• Foster a culture of quality and ownership by setting high standards for code reviews and design, and advocating for best practices through technical writing and talks.
• Mentor engineering talent by providing actionable feedback, guidance, and leading by example to grow the team's capabilities.
   

Role Requirements:

• At least 5 years of proficiency in Kotlin with extensive experience designing, developing, and launching backend systems at scale
• Deep experience with distributed systems and high-availability architectures
• Experience in technical leadership in system design, with a proven ability to deliver significant features using elegant, simple, and extensible designs
• Strong infrastructure knowledge, including technologies such as AWS, MySQL/DynamoDB, and Kubernetes
• Proficiency in large-scale codebase management, utilizing a suite of tools and practices that ensure safe and efficient technical changes
• Experience in operational monitoring, including the use of metrics and tracing to maintain system health
• Excellent collaboration skills for effective partnership with global, cross-functional engineering teams
• Well spoken and written knowledge of the English language (C1)
   

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

What You’ll Do
Build, and maintain Android TV and Fire TV applications using Kotlin
Own TV-specific architecture, navigation, and playback flows
Implement and optimize video playback.

Required Experience
5+ years of Android development experience
Strong proficiency with:
Kotlin
Android SDK
Hands-on experience with:
Android TV / Google TV development
Fire TV development
Video playback pipelines
Remote control navigation and focus management
Coroutines and asynchronous programming
Experience integrating APIs (GraphQL or REST)
Strong understanding of performance optimization on TV hardware
 

Nice-to-have: Experience with other OTT platforms (Roku, Apple TV, Tizen)

Languages
Ukrainian: Native or near-native (Required)
English: Conversational (good for daily communication)

N-iX is looking for a Middle Kotlin Engineer to join our team.

Our customer is a fintech company that provides flexible buy-now-pay-later solutions, enabling consumers to split purchases into transparent, interest-free, or interest-based payments. The customer's Platform team is responsible for managing critical services that are essential to the success and sustainability of the organisation. In simple terms, the team handles transactional communication send-outs to customers via email, SMS, and push notifications. These services demand attention to detail, proactive maintenance, and swift response times to ensure seamless operations. The recent high-priority initiatives include re-architecture/platform modernisation, high availability, and internationalisation efforts; these are vital for our organisation's growth and competitiveness in the market. These initiatives require dedicated expertise and resources to execute efficiently and effectively.
 

Main Responsibilities:

• Design and develop a robust and extensible Kotlin framework and platform.
• Own and deliver quarterly goals by leading engineers through ambiguity to solve open-ended problems while ensuring team support throughout delivery.
• Collaborate across the product development lifecycle with product management, design, and analytics to participate in ideation and articulate technical constraints.
• Drive decision-making and risk assessment by partnering on strategic technical choices that properly consider trade-offs and business impact.
• Proactively identify and resolve systemic issues across projects, processes, and technology, advocating for and leading the implementation of solutions.
• Ensure operational excellence and availability by creating and monitoring metrics, supporting "keep the lights on" efforts, and participating in an on-call rotation.
• Foster a culture of quality and ownership by setting high standards for code reviews and design, and advocating for best practices through technical writing and talks.
• Mentor engineering talent by providing actionable feedback, guidance, and leading by example to grow the team's capabilities.
   

Role Requirements:

• At least 3 years of proficiency in Kotlin with extensive experience designing, developing, and launching backend systems at scale
• Deep experience with distributed systems and high-availability architectures
• Experience in technical leadership in system design, with a proven ability to deliver significant features using elegant, simple, and extensible designs
• Strong infrastructure knowledge, including technologies such as AWS, MySQL/DynamoDB, and Kubernetes
• Proficiency in large-scale codebase management, utilizing a suite of tools and practices that ensure safe and efficient technical changes
• Experience in operational monitoring, including the use of metrics and tracing to maintain system health
• Excellent collaboration skills for effective partnership with global, cross-functional engineering teams
• Well spoken and written knowledge of the English language 
   

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

N-iX is looking for a Lead/Senior Kotlin Engineer to join our team.

Our customer is a fintech company that provides flexible buy-now-pay-later solutions, enabling consumers to split purchases into transparent, interest-free, or interest-based payments. The customer's Platform team is responsible for managing critical services that are essential to the success and sustainability of the organization. 

In simple terms, the team handles transactional communication send-outs to customers via email, SMS, and push notifications. These services demand attention to detail, proactive maintenance, and swift response times to ensure seamless operations. 

The recent high-priority initiatives include re-architecture/platform modernization, high availability, and internationalization efforts; these are vital for our organization's growth and competitiveness in the market. These initiatives require dedicated expertise and resources to execute efficiently and effectively.

Main Responsibilities:

• Design and develop a robust and extensible Kotlin framework and platform.
• Own and deliver quarterly goals by leading engineers through ambiguity to solve open-ended problems while ensuring team support throughout delivery.
• Collaborate across the product development lifecycle with product management, design, and analytics to participate in ideation and articulate technical constraints.
• Drive decision-making and risk assessment by partnering on strategic technical choices that properly consider trade-offs and business impact.
• Proactively identify and resolve systemic issues across projects, processes, and technology, advocating for and leading the implementation of solutions.
• Ensure operational excellence and availability by creating and monitoring metrics, supporting "keep the lights on" efforts, and participating in an on-call rotation.
• Foster a culture of quality and ownership by setting high standards for code reviews and design, and advocating for best practices through technical writing and talks.

• Mentor engineering talent by providing actionable feedback, guidance, and leading by example to grow the team's capabilities.

   

Role Requirements:

• At least 5 years of proficiency in Kotlin with extensive experience designing, developing, and launching backend systems at scale
• Deep experience with distributed systems and high-availability architectures
• Experience in technical leadership in system design, with a proven ability to deliver significant features using elegant, simple, and extensible designs
• Strong infrastructure knowledge, including technologies such as AWS, MySQL/DynamoDB, and Kubernetes
• Proficiency in large-scale codebase management, utilizing a suite of tools and practices that ensure safe and efficient technical changes
• Experience in operational monitoring, including the use of metrics and tracing to maintain system health
• Excellent collaboration skills for effective partnership with global, cross-functional engineering teams
• Well spoken and written knowledge of the English language (C1)

Android Developer (Middle/Senior) — Next Era Solutions
Remote | Full-Time | Outstaff

About Next Era Solutions

Next Era Solutions is a mobile development team with 7+ years of experience delivering complex apps on time and within budget. We combine strong engineering practices, modern technology, and clear communication to help clients build reliable, user-friendly mobile products across different industries.

Engagement & Hiring Timeline

• Format: outstaff cooperation, full-time 40 hours/week, fully remote
• Fast 15-minute screening call (intro + expectations + quick fit check)
• Candidate confirmation typically takes about 2 weeks on average, but it can take up to 1 month depending on the client’s approval process

What you’ll do

• Build and maintain Android applications using Kotlin
• Deliver new features, refactor legacy code, and improve performance and stability
• Design and evolve architecture (MVVM/Clean Architecture; modularization when needed)
• Integrate with backend services via REST APIs and/or GraphQL
• Work with local storage, background tasks, and app lifecycle; ensure reliable releases
• Write tests (unit/UI), participate in code reviews, and improve team engineering practices
• Collaborate with product/design/backend; communicate with the client to clarify requirements and propose solutions
• For Senior level: take ownership of technical direction, mentor engineers, drive quality improvements

Typical stack (varies by project)

• Kotlin, Coroutines, Flow
• UI: Jetpack Compose and/or XML Views
• Architecture: MVVM, Clean Architecture, modularization
• Networking: Retrofit/OkHttp, REST, GraphQL
• Storage: Room, DataStore, SQLite
• Tools: Git, Android Studio, Gradle, CI/CD, Firebase, Figma

What we’re looking for

• 3+ years of commercial Android development experience (Middle/Senior level)
• Strong Kotlin skills; solid understanding of Android platform fundamentals
• Experience shipping and maintaining production apps on Google Play
• Good architecture knowledge, clean code mindset, and independence in delivery
• Hands-on experience with API integration (REST and/or GraphQL), async, error handling
• English level: B2 or higher for technical communication

Nice to have

• Jetpack Compose in production, performance optimization, profiling
• Push notifications, in-app purchases/subscriptions, deep links
• Experience with fintech/e-commerce or large-scale apps
• Client-facing experience and strong ownership

What we offer

• Full-time remote work 40 hours/week
• Long-term outstaff collaboration with stable workload
• Modern projects, clear processes, and a supportive engineering team
• Flexible location and schedule (results-focused)
• A major advantage: we support multiple payment options and can arrange the most convenient format for you (depending on your location and preferences)

How to apply

Apply and we’ll schedule a quick 15-minute screening call. If everything matches, we’ll guide you through the next steps and aim to confirm the candidate within about 2 weeks on average (up to 1 month depending on the client).

About the project:

We are finalizing a Telehealth platform designed to bridge the gap between doctors and patients. Our goal is to provide a seamless, secure, and accessible medical experience. We are currently in the critical phase of preparing our mobile applications (iOS & Android) for the official live release.

We are looking for a skilled Mobile Developer with strong Kotlin expertise and experience in Kotlin Multiplatform (KMP) to help us polish the functionality, ensure stability, and successfully launch the product.

Does this relate to you?

• KMP knowledge: Commercial experience with Kotlin Multiplatform Mobile OR a strong portfolio/pet projects with a deep understanding of KMP architecture.
• iOS familiarity: You don’t need to be a Swift expert, but you must be comfortable opening Xcode, building the iOS project, debugging, and writing basic Swift wrappers if needed.
• English is Upper-intermediate.

• Experience in the Healthcare/Telehealth domain is nice to have.

   

A new team member will be in charge of:

• Develop and maintain shared business logic using Kotlin Multiplatform for both Android and iOS applications.
• Implement and refine features for two distinct user roles: Patients (booking, consultations, history) and Doctors (schedule management, patient records).
• Work with platform-specific code when necessary (Kotlin for Android, Swift for iOS) to ensure a native look and feel.
• Collaborate with the backend team to integrate APIs and handle sensitive medical data securely.
• Focus on quality: Fix bugs, optimize performance, and resolve UI/UX inconsistencies before the release.
• Assist in the preparation and submission of apps to the App Store and Google Play.

Ми — арбітражна (gambling) команда з досвідом понад 4 роки, що динамічно розвивається. Наші співробітники — наша головна цінність, тому ми створюємо всі умови для кар'єрного зростання, гнучкої роботи та дружньої атмосфери.

Наразі ми шукаємо Kotlin/Java Developer, щоб разом запускати круті технічні рішення для iGaming-напрямку.

Що ми пропонуємо:

• комфортне розташування офісу;
• обід за рахунок компанії;
• конкурентні умови праці;
• можливість професійного розвитку та навчання за рахунок компанії;
• співпраця з топами ринку, менторство та підтримка;
• розвинену корпоративну культуру: тімбілдинги, майстер-класи, тематичні вечірки, цікаві подарунки, онлайн-ігри, гастровечори та оплата будь-якого спорту.

Завдання, які потрібно виконувати:

• підтримка існуючих проєктів (телеграм боти) та розробка нових (backend для внутрішніх інструментів компанії);
• ведення комунікації з розробниками (користувачами API);
• ведення звітності щодо виконаної роботи (Notion).

Стек технологій:

• Kotlin;
• Spring Boot v3+;
• PostgreSQL, ClickHouse, Redis;
• Docker.

Особисті якості та навички:

• досвід від року і більше;
• комунікабельність і вміння ефективно працювати в команді;
• посидючість та уважність до деталей, здатність знаходити першопричини проблем;
• готовність до постійного навчання та освоєння нових технологій.

Не зволікай — відгукуйся прямо зараз! Стань частиною команди, де твоя думка має вагу, а твоя робота — значення!