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Senior Android developer

CallApp is growing and we are currently looking for a Mobile Android Developer to join our R&D dream team. Play a central role in building a brand new mobile features with the modern mobile toolkit and SW development best practices in mind.

Requirements

• 3+ years of Android Development experience (Java/Kotlin)
• Collaborated with a team to define, design, and ship new features
• Experience with Android Mobile App UI/UX design and development
• Experience with multithreading programming and mobile memory management
• Problem solver that can work independently, excellent communications skills

Bonus Points If You Have Experience In

• Experience writing Mobile SDKs
• Experience working Firebase Cloud technologies
• Familiar with the release process to Google Play store

Why join CallApp?

• Competitive salary
• Work with, and learn from, top-notch talent
• Take a central and critical role at CallApp
• Competitive equity
• Gym package
• Work-life harmony
• Dog friendly office

About CallApp:

CallApp is a Free Caller ID and Phone Call Blocker app that allows mobile users to block phone calls, identify telemarketing calls, record phone calls, blacklist unwanted callers and much more.
The App has not only been chosen by Google as one of the top Android apps, but it won several awards, supports over 200 countries, and is integrated with over 70 information sources.

Backend Developer & Cloud Operations Engineer

About the Role
CallApp is looking for a skilled Backend Developer & Cloud Operations Engineer to join our team.
In this role, you will be responsible for developing our application server and service and maintaining and managing our AWS and GCP cloud infrastructure.
You will play a central role in ensuring our backend services are reliable, secure, and performant.

• Maintain and optimize our AWS and GCP infrastructure, including: EC2, EBS, S3, SQS, Lambda. CloudFront, CloudWatch, BigQuery and GCP APIs and services
• Monitor system health, performance, and costs, and implement improvements as needed.
• Ensure security, compliance, and disaster recovery readiness.

• Design, develop, and maintain the Java/Spring Boot application server that powers APIs and services used by our multi-million users.
• Implement RESTful APIs, authentication, and business logic.
• Optimize performance and scalability to support large numbers of mobile users.
• Write clean, maintainable, and testable code.
• Troubleshoot and resolve production issues.

• 3 years of proven experience with the following skills:
• Strong experience with Java and Spring Boot backend development.
• Solid experience with AWS.
• Proficiency with Linux OS.
• Strong problem-solving skills and attention to detail.
• Clear communication and ability to collaborate effectively.
• Proactive and self-motivated approach.

• Familiarity with GCP.
• Experience with scripting (Python, PHP)
• Experience with Apache Spark for data processing
• Familiarity with Docker or Kubernetes
• Proficiency with Git and CI/CD pipelines
• Working knowledge of relational and NoSQL databases.

About CallApp:
CallApp is a Free Caller ID and Phone Call Blocker app that allows mobile users to block phone calls, identify telemarketing calls, record phone calls, blacklist unwanted callers and much more.
The App has not only been chosen by Google as one of the top Android apps, but it won several awards, supports over 200 countries, and is integrated with over 70 information sources.

iOS QA Engineer

CallApp is seeking a skilled iOS QA Engineer to ensure the quality of our caller ID
and call blocking app serving millions of users worldwide. Help us deliver
exceptional iOS experiences across the Apple ecosystem.

What you’ll do:

• Own the QA process for the entire iOS stack, including SwiftUI app, Call Directory & CallKit extensions, Widgets, and Live Activities.
• Review product specifications and technical designs, proactively identifying potential testability issues and edge-case scenarios.
• Create clear and detailed test plans, as well as exploratory test charters, covering a range of iPhone form factors and scenarios.
• Perform comprehensive manual testing, including functional, usability, accessibility, and network condition testing.
• Clearly trace, reproduce, and document issues using Jira, supported by videos, logs, and precise reproduction steps.
• Execute thorough regression testing on every release candidate and validate hotfixes via TestFlight.
• Monitor production environments (Crashlytics, Firebase, Analytics), analyzing issues and collaborating with engineers on root cause investigations.
• Advocate for best practices in quality engineering and contribute actively to our growing QA team.

What you bring:

• Strong communication skills and meticulous attention to detail.
• 2+ years of experience in iOS mobile QA.
• Hands-on experience testing consumer facing iOS applications.

• Familiarity with CallKit, Contacts, VoIP, telecom systems, or spam blocking domains.
• Expertise in performance analysis, battery consumption, and memory profiling.
• Proficiency in Swift programming and scripting in Bash for automation and tooling.
• Previous experience working with apps used by millions of users.

• Impact at scale: Your work directly protects millions from spam calls and shapes a modern, legacy-free iOS codebase.
• Top-tier team: Collaborate daily with passionate, experienced iOS engineers who deeply value quality.
• Financially strong and growing: Profitable business with a global presence, offering ample greenfield opportunities for innovation.
• Competitive benefits: Attractive salary, dog friendly workspace, and gym facilities.

Senior iOS Developer

• Deliver features end-to-end: plan, build, test, release, and monitor core app modules plus extensions (Call Directory, CallKit, Widgets, Live Activities).
• Elevate code quality: write elegant, self-documented Swift, uphold clear coding standards, and keep PRs small and reviewable.
• Influence architecture: propose patterns, modularize components, and discuss trade-offs with the team before final decisions are made.
• Leverage AI tools (e.g., ChatGPT, Claude, GitHub Copilot) as part of your everyday workflow: from brainstorming solutions and generating test data to accelerating bug hunting and documentation.
• Self-directed, takes initiative and work autonomously. You’ll understand requirements, research solutions independently, and have the judgment to know when to ask questions.
• Contribute to Call Directory & CallKit extensions, Widgets, and Live Activities, working under mentorship and regular code reviews.
• Collaborate closely with designers and QA engineers to catch visual or functional issues early, keeping our user experience crisp and consistent.
• Debug and fix problems in existing code, using a methodical, detail-oriented approach to prevent regressions.
• Stay current & share: test new iOS APIs and present concise findings to the team.

• 5+ years of iOS development experience with a proven track record of shipping high-quality applications to the App Store.
• Deep expertise in Swift, SwiftUI, and iOS frameworks – you understand the platform deeply and can work independently on complex features.
• Sharp attention to detail — you catch visual glitches and hidden bugs early, before they reach QA.
• Beautiful, testable code habits – small PRs, clear commits, thoughtful abstractions, and automated tests where they matter.
• AI-powered productivity – you treat tools like ChatGPT, Claude, or Copilot as everyday teammates for ideation, refactoring, and unit-test generation.
• A learning mindset and friendly, clear communication – you ask “why,” welcome feedback, and elevate the whole team through pair programming (human or AI) and knowledge sharing.

• Worked with phone-related APIs such as CallKit, the Contacts framework, or other VoIP tools.
• Used SwiftData or another storage layer (Core Data, Realm, etc.) to save and load app data.
• Experience in UI/Unit Testing.
• Experience with CI/CD processes and TestFlight distribution.

• Learn at scale: Develop your skills while working on features that directly impact millions of users using the latest iOS technologies and SwiftUI framework.
• Mentorship-focused team: Work alongside passionate, experienced iOS engineers who are committed to helping you grow and succeed.
• Financially strong and growing: Profitable business with a global presence, offering excellent opportunities for career advancement and skill development.
• Competitive benefits: Attractive salary, dog friendly workspace, and gym facilities.

iOS Developer

• Develop and refine features for our SwiftUI-based iOS app with pixel-perfect attention to detail, ensuring every screen looks and feels exactly as designed.
• Write elegant, self documenting Swift code that is easy to read, easy to maintain, and a pleasure for teammates to build on.
• Leverage AI tools (e.g., ChatGPT, Claude, GitHub Copilot) as part of your everyday workflow – from brainstorming solutions and generating test data to accelerating bug hunting and documentation.
• Self-directed, takes initiative and work autonomously. You’ll understand requirements, research solutions independently, and have the judgment to know when to ask questions.
• Contribute to Call Directory & CallKit extensions, Widgets, and Live Activities, working under mentorship and regular code reviews.
• Collaborate closely with designers and QA engineers to catch visual or functional issues early, keeping our user experience crisp and consistent.
• Debug and fix problems in existing code, using a methodical, detail-oriented approach to prevent regressions.
• Learn and apply iOS best practices (memory management, performance, accessibility) and help document them for the team.
• Participate in architecture discussions, bringing an organized, clear communication style that moves the conversation forward.

• At least 2 years of hands-on Swift/SwiftUI development – you’ve shipped real code to real users and can point to the lessons learned.
• Sharp attention to detail — you catch visual glitches and hidden bugs early, before they reach QA.
• Beautiful, testable code habits – small PRs, clear commits, thoughtful abstractions, and automated tests where they matter.
• AI-powered productivity – you treat tools like ChatGPT, Claude, or Copilot as everyday teammates for ideation, refactoring, and unit-test generation.
• A learning mindset and friendly, clear communication – you ask “why,” welcome feedback, and elevate the whole team through pair programming (human or AI) and knowledge sharing.

• Worked with phone-related APIs such as CallKit, the Contacts framework, or other VoIP tools.
• Used SwiftData or another storage layer (Core Data, Realm, etc.) to save and load app data.
• Experience in UI/Unit Testing.
• Experience with CI/CD processes and TestFlight distribution.

• Learn at scale: Develop your skills while working on features that directly impact millions of users using the latest iOS technologies and SwiftUI framework.
• Mentorship-focused team: Work alongside passionate, experienced iOS engineers who are committed to helping you grow and succeed.
• Financially strong and growing: Profitable business with a global presence, offering excellent opportunities for career advancement and skill development.
• Competitive benefits: Attractive salary, dog friendly workspace, and gym facilities.

Data Analyst

CallApp is a caller ID and call blocking app for Android and iOS. It helps users block unwanted calls and messages, identify spammers, record calls, and enrich contacts with detailed information.
With coverage of more than 8 billion numbers and data from over 60 sources, CallApp is one of the most advanced caller ID solutions in the market. CallApp combines your dialer with smart search features to make communication clearer and safer.

About the Role
The Data Team plays a central role in powering product decisions, growth, user insights, and system integrity across the company.
We are looking for a Data Analyst who will join the Data and Analytics team and help drive product excellence, user insights, business performance, and operational quality.
This role includes ownership of analytical pipelines, dashboards, reporting, and data investigations that support decision making across product, marketing, monetization, and engineering.

You will work closely with product managers, developers, BI engineers, and leadership to transform raw data into actionable insights and measurable improvements.

Responsibilities

• Analyze product usage, engagement patterns, and retention metrics to support product teams with clear insights and recommendations.
• Build and maintain dashboards, and data models that reflect key KPIs.
• Investigate anomalies, drops, and shifts in KPIs while partnering with engineering and product teams to identify root causes.
• Provide data support for User Acquisition and Monetization including campaign measurement, cohort analysis, user segmentation, and funnel analytics.
• Contribute to team knowledge, best practices, and analytical frameworks to strengthen analytics across the company.

Requirements

• At least 3 years of hands-on experience as a Data Analyst or Product Analyst in a consumer product or mobile app environment.
• Strong SQL skills with the ability to query large datasets and write clean, efficient logic.
• Familiarity with the GCP ecosystem, especially BigQuery, is a strong advantage.
• Experience working with visualization tools such as Looker Studio, Tableau, Redash or similar.
• Solid understanding of retention, engagement, funnels, cohorts, and event based analytics.
• Experience with A/B testing methodologies and experiment evaluation.
• Strong analytical thinking, attention to detail, and a structured approach to problem solving.
• Ability to present insights clearly, translate data into narratives, and communicate effectively with technical and non technical partners.
• Familiarity with mobile analytics platforms is a plus.

Why Join Us

• Work on a high scale, data driven mobile app with millions of users.
• Join a focused and collaborative team that has a direct impact on product direction and company performance.
• Freedom to own analytical domains, improve processes, and shape how data is used across CallApp.
• Competitive salary and equity.
• Convenient office location close to major train lines and central roads.
• Dog friendly office.