Hire Kotlin Development Team


Build digital products with a dedicated Kotlin development team that behaves like an in-house squad. We bring Android, backend, and Kotlin Multiplatform specialists who care about roadmap outcomes, not just story points.

From greenfield apps to refactors of legacy Java systems, we pair senior Kotlin engineers with delivery leadership so you get predictable releases, clean architecture, and measurable business impact. Explore how we helped Finwave revamp its mobile banking experience.

Hire Kotlin development team – team with Kotlin developers

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10 days

Average ramp-up to put a senior Kotlin squad in production.

92%

Sprint commitments met thanks to proactive delivery management.

3x

Release frequency increase on hybrid teams we co-manage.

Kotlin Development Team Services

We embed with your product, design, and platform teams to deliver Kotlin software that can be supported long term. Whether you need to accelerate a roadmap or co-own delivery, our squads adapt to your rituals and tooling.

  • Product-grade Android apps crafted with Jetpack Compose, Material You, and modular architecture to keep features shippable.
  • Cloud-native backend services using Spring Boot, Ktor, and GraphQL to support real-time, event-driven products.
  • Kotlin Multiplatform delivery that shares business logic across iOS, Android, and web following JetBrains best practices.
  • Modernization of Java systems with staged Kotlin adoption, automated regression testing, and detailed migration playbooks.
  • Quality automation with unit, integration, and device lab coverage plus observability dashboards that surface regressions early.
  • Collaborative delivery leadership that syncs with your outsourced development initiatives and keeps stakeholders aligned.

Kotlin development services icon

Why hire our Kotlin team?

We partner with CTOs, engineering managers, and product leaders who need a Kotlin squad that can own outcomes. Every engagement comes with a delivery lead, technical lead, and a plan for how we integrate with your rituals.

  • Seniors-first staffing with engineers who have launched Kotlin products in fintech, health, mobility, and SaaS.
  • Design-for-scale architecture leveraging layered modules, clean architecture, and automated benchmarks to prevent drift.
  • Java + Kotlin interoperability that keeps your existing services running while we incrementally refactor critical paths.

Our team in the Americas overlaps with U.S. time zones and collaborates in English and Spanish. We keep work transparent and maintain story-level traceability so you always know the status of your roadmap.

  • Delivery rituals that fit — sprint reviews, async updates, and stakeholder demos tailored to your operating model.
  • Performance-first mindset with proactive profiling, crash analytics, and continuous UX feedback loops.
  • Clear benchmarks tied to user adoption, release cadence, and quality metrics you already track.

How our Kotlin teams integrate with you

1. Technical discovery

We review your architecture, pipelines, and product bets. Expect code audits, backlog refinement, and a shared success scorecard within the first week.

2. Squad alignment

We define team composition, overlaps, and sprint rituals with your leaders. Tooling is connected to your repos, Slack, Jira, and observability stack.

3. Predictable delivery

We ship in measured increments, track scope changes, and share burndown, quality, and adoption metrics so you can prove impact to stakeholders.

Tech stack

We use modern Kotlin tools and frameworks to keep your applications maintainable and future‑proof.

  • Kotlin (JVM, Android, Multiplatform), Coroutines, Flow
  • Android: Jetpack Compose, Room, Navigation, Hilt, WorkManager
  • Backend: Spring Boot, Ktor, Gradle, Maven
  • Multiplatform: shared code, expect/actual, native interop
  • Testing: JUnit, MockK, Espresso, automated testing frameworks
  • CI/CD: GitHub Actions, Jenkins, Bitrise, App Store releases

Case study: Finwave mobile banking relaunch

Finwave, a U.S. fintech scaleup, needed to relaunch its Android app without interrupting 600K active customers. Their team was juggling a Java monolith, PCI compliance needs, and pressure from partners to deliver new budgeting features.

We partnered with their VP of Engineering to assemble a mixed squad of Android, backend, and QA engineers who worked alongside internal leads. Together we:

  • Introduced a modular Kotlin architecture with Jetpack Compose and Navigation to cut build times by 37%.
  • Created Ktor services that exposed budgeting APIs and synchronized with existing Spring Boot services via gRPC.
  • Automated device-lab regression tests and integrated release gates with Finwave's SOC 2 controls.

Impact in the first 16 weeks

  • 3.6★ → 4.7★ Google Play rating after redesigning customer flows and squashing legacy crashes.
  • +28% weekly active users engaging with the new budgeting dashboard.
  • Zero downtime during rollout thanks to staged releases and feature flags.

“Siblings Software is the reason we could sunset Java faster than planned. They delivered Kotlin craftsmanship and kept our execs aligned every sprint.” — VP of Engineering, Finwave

Explore more case studies

Team composition & engagement models

Every team blends experienced Kotlin developers with the roles you need to keep velocity steady. We frequently combine:

  • Android engineers focused on Jetpack Compose design systems and accessibility.
  • Backend developers who design resilient Kotlin services, caching strategies, and observability pipelines.
  • Kotlin Multiplatform engineers coordinating code sharing with web or iOS teams.
  • QA automation engineers building Espresso, MockK, and end-to-end suites.
  • Delivery leads ensuring sprint health and cross-team communication.

Choose the engagement model that matches your roadmap:

  • Dedicated pods that behave like an extension of your in-house group—ideal when you want to keep product ownership.
  • Co-delivery teams where we partner with your staff augmentation strategy to reinforce existing squads.
  • Managed outcomes with SLAs, release plans, and business KPIs owned by Siblings Software.

Need to cover other technologies alongside Kotlin? We can combine with our Kotlin development services and cross-functional expertise across web, cloud, and data.

FAQs

Usually within 1–2 weeks. We align on goals, assemble the team, and begin onboarding with your codebase and processes.

Yes. We migrate Java code to Kotlin incrementally, maintaining compatibility while improving code quality and leveraging Kotlin's modern features.

Absolutely. We build multiplatform projects that share business logic across iOS, Android, web, and desktop while maintaining platform‑specific UI layers.

Yes. We build Spring Boot microservices and Ktor applications with Kotlin, leveraging Coroutines for efficient async processing and modern JVM patterns.

OUR STANDARDS

Kotlin development, done right.

We write idiomatic Kotlin guided by domain-driven design, disciplined dependency management, and a definition of done that includes documentation, observability, and knowledge transfer.

Every feature is backed by code reviews, performance budgets, and continuous monitoring of crash-free sessions and ANRs. Async efficiency and accessibility are treated as first-class acceptance criteria.

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If you’re interested in hiring developers for this capability in Argentina, visit the Argentina version of this page.

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