Job description template

Mobile App Developer

We’re seeking a mid-level Mobile App Developer to build and improve customer-facing mobile experiences with a focus on reliability, performance, and maintainability. You’ll work independently on well-defined features, collaborate with product and backend partners, and help raise the quality bar across the mobile codebase.

Responsibilities

Develop and maintain iOS and/or Android features end-to-end, from implementation through release readiness
Integrate mobile apps with backend APIs, authentication, and analytics using well-defined contracts
Optimize app performance and responsiveness by profiling, addressing bottlenecks, and improving user flows
Implement robust error handling, retries, and user-friendly recovery patterns for network and edge cases
Create and maintain automated tests for key flows and regression prevention
Collaborate on app architecture decisions and code standards, including component design and API usage patterns
Participate in code reviews and provide actionable feedback to improve code quality and consistency

Must-have qualifications

Hands-on experience building production mobile apps (iOS and/or Android)
Strong proficiency in at least one mobile framework (e.g., Swift/SwiftUI, Kotlin/Jetpack Compose)
Experience integrating mobile apps with REST/GraphQL APIs, including authentication and pagination/search patterns
Ability to profile and improve mobile performance (startup time, rendering, memory, network behavior)
Practical experience writing automated tests for mobile features and workflows
Competence diagnosing and fixing production issues using logs, crash reports, and analytics signals

Nice to have

Experience with CI/CD for mobile releases and automated build/test pipelines
Familiarity with push notifications and background/foreground lifecycle handling
Knowledge of accessibility and localization best practices for mobile apps

What success looks like in 12 months

Ship customer-facing mobile features reliably
Improve app stability and reduce incidents
Increase test coverage for critical flows
Optimize performance for key user experiences
Strengthen maintainability of the mobile codebase

Logistics

Full-time (40 hours a week), remote from Latin America.
Working hours overlap with US business hours.

About the company

[About your company: what you build, your stage and team size]

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Interview scorecard

Score every candidate against the same bar

Deliver reliable, high-quality mobile features that improve user experience and app performance while collaborating effectively across product and backend teams.

Outcomes to measure

What this hire should deliver in the first year. Replace [N] with your own targets.

Ship customer-facing mobile features reliably. Measure: release [N] mobile features with a post-release defect rate of no more than [X]% and meet expected acceptance criteria for each
Improve app stability and reduce incidents. Measure: reduce production crash-free issues/incidents by [X]% (measured via crash reports and incident tracking) within 12 months
Increase test coverage for critical flows. Measure: add or expand automated coverage for key user journeys to reach [X]% coverage and maintain [Y]% pass rate in mobile CI
Optimize performance for key user experiences. Measure: improve at least [N] tracked performance metrics (e.g., startup time, scroll/render jank, memory usage) by [X]% against baseline measured during onboarding
Strengthen maintainability of the mobile codebase. Measure: refactor or modularize [N] high-churn areas with documented outcomes (e.g., reduced duplicated code, improved build/test times) and maintain no regression in existing critical flows

Competencies and weights

What to evaluate, how much it counts and what a strong answer looks like.

Mobile Feature Delivery · 28%
The role requires independent delivery of well-defined mobile work from implementation through release readiness. Evaluated in Round 1.

Weak: Completes assigned changes but struggles to get features to release readiness without rework
Meets the bar: Delivers planned features that pass review and QA with manageable rework
Strong: Independently delivers features end-to-end with clear tradeoffs, predictable quality, and minimal post-release issues

API Integration · 18%
Mobile work must integrate correctly with backend contracts, authentication, and data fetching patterns. Evaluated in Round 1.

Weak: Integrates APIs but misses edge cases like auth expiration, pagination, or inconsistent error handling
Meets the bar: Implements API integration with correct auth handling, pagination, and reasonable error states
Strong: Implements resilient integration (timeouts, retries, caching where appropriate) with clear contracts and robust user-facing fallbacks

Performance Profiling · 16%
Performance work is essential to improving user experience and reducing churn caused by slow or unstable behavior. Evaluated in Round 2.

Weak: Fixes performance issues without using profiling evidence or validates improvements poorly
Meets the bar: Uses profiling tools to identify bottlenecks and verifies measurable improvements
Strong: Systematically profiles, isolates root cause, applies targeted fixes, and validates results with before/after metrics

Testing Discipline · 14%
Automated testing is key to preventing regressions and supporting ongoing releases. Evaluated in Round 2.

Weak: Adds tests inconsistently or focuses only on superficial cases
Meets the bar: Adds tests for critical flows and maintains reliable automated runs
Strong: Designs tests that cover edge cases, uses appropriate test layers, and reduces flakiness while improving confidence in releases

Production Debugging · 12%
The role must diagnose and resolve production issues using available observability signals. Evaluated in Round 3.

Weak: Relies on guesswork or cannot explain how they would trace a reported issue
Meets the bar: Uses crash logs, device metrics, and analytics to narrow root causes and validate fixes
Strong: Provides structured debugging with evidence, prevents recurrence via better instrumentation/tests, and communicates clearly

Ownership and Communication · 12%
Mid-level independence requires clear communication of risks, decisions, and progress with stakeholders. Evaluated in Round 3.

Weak: Waits for frequent guidance or communicates updates too late
Meets the bar: Works independently on defined scope and keeps stakeholders informed with actionable status
Strong: Proactively identifies risks, aligns on requirements early, and drives decisions to closure with crisp updates

Interview questions

Questions for every interview round

Each round has an owner, a time box and questions that test the competencies above.

Round 1: Mobile Foundations & Integration
Senior Mobile Engineer · 60 min

Tell us about a production mobile feature you delivered independently—what problem was it solving and how did you ensure it met release readiness?
Walk through how you integrated a mobile app with backend APIs (REST or GraphQL). How did you handle authentication, pagination, and error states (including offline or timeout cases)?
Describe a time you encountered an API contract mismatch or unexpected backend behavior. How did you diagnose it and coordinate a fix?

Round 2: Performance & Quality Engineering
Staff QA / Mobile Lead · 60 min

How do you profile and improve mobile performance (startup, rendering, memory, or network)? Share an example with before/after measurable impact.
Explain your approach to testing mobile features. What test types do you use (unit/integration/UI), and how do you choose what to automate?
Describe a flakey test you worked on. What caused the flakiness and how did you stabilize the suite?

Round 3: Production Impact & Debugging
Engineering Manager · 60 min

Tell us about a production incident you personally debugged in a mobile app. What signals did you use (crash reports, logs, analytics), what was the root cause, and how did you validate the fix?
How do you decide whether a bug should be fixed via code change, configuration change, instrumentation, or a product/UX adjustment?
Give an example of how you owned a well-defined scope with minimal supervision. What did you communicate, what risks did you surface, and what was the outcome?

Red flags to watch for

Candidate cannot describe concrete production experience (features shipped, issues resolved, or performance improvements)
Relies on guesswork for debugging or cannot explain how they would use crash logs/metrics to reach root cause
Test strategy is shallow (only superficial tests) or ignores edge cases and release confidence
Cannot explain how they handle auth, pagination, retries/timeouts, or other API integration realities
Shows limited ownership (requires constant direction) or provides unclear communication about decisions and tradeoffs

How much does it cost to hire a Mobile App Developer in Latin America?

In 2026, a senior Mobile App Developer in Latin America costs $6,750 to $7,750 a month all-in, versus $14,625 in the US: up to 54% less. Mid-level starts at $4,500.

Country

Mid-level

Senior

Argentina

$4,500

$6,750

Brazil

$5,000

$7,500

Colombia

$4,500

$6,750

Mexico

$5,250

$7,750

United States

$11,875

$14,625

Monthly cost in USD, all-in: the talent's salary plus Teilur's flat 20% fee, from our 2026 rates. The United States row shows what the same role typically costs there.

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Frequently asked questions

What does a Mobile App Developer do?

Typical responsibilities include: develop and maintain iOS and/or Android features end-to-end, from implementation through release readiness; integrate mobile apps with backend APIs, authentication, and analytics using well-defined contracts; optimize app performance and responsiveness by profiling, addressing bottlenecks, and improving user flows. The full list is in the template above.

How much does it cost to hire a Mobile App Developer in Latin America?

In 2026, a senior Mobile App Developer in Latin America costs $6,750 to $7,750 a month all-in, versus $14,625 in the US: up to 54% less. Mid-level starts at $4,500.

Can I customize this Mobile App Developer job description?

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Mobile App Developer Job Description Template