April 29, 2026

Senior iOS Software Engineer

Senior • On-site

14,808 - 20,033 USD/yr

New York City, NY

Our mission at Duolingo is to develop the best education in the world and make it universally available. It's a big mission, and that's where you come in!

At Duolingo, you'll join a team that cares about finding innovative solutions to complex technical problems, running countless experiments (300+ at a time!) with our massive user base to make data-driven decisions, and educating our users and employees alike. You'll have limitless learning opportunities, mentorship and collaboration with world-class minds, and a variety of projects with large scopes — while doing work that's both fun and meaningful.

Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world.


About the role

We are hiring for multiple levels for any one of the following teams. Leveling is usually determined once all interviews are completed.

Math Team

As an iOS engineer on the Math team, you will help build the technology that changes how people around the world learn Math. The features that you ship will help learners to develop core math skills in a fun, engaging way. We're looking for engineers who love building new products and features.

Notifications Team
As an iOS engineer on the Notifications team, you will build features that empower learners to build long-term habits by improving how we schedule, personalize, and deliver notifications. You will design and implement meaningful notification experiences while collaborating with backend, data science, and product teams. Notifications are fundamental to Duolingo, and we're looking for engineers who are energized about experimenting and shipping features end-to-end.


Core App Performance Team
The Core App Experience team is in charge of improving the user experience in core flows of the iOS and Android apps to drive user growth. Sitting in between the intersection of technical and product work, you will drive technical improvements in app open, session start and end, and improving the offline experience. We're looking for engineers who are willing to deep dive into the codebase and provide their suggestions on how to improve the everyday experience of our users.

You will...

  • Collaborate on software projects with product design and backend aspects
  • Develop, release, and maintain native iOS applications, primarily in Swift
  • Mentor and set technical direction for junior engineers across the company

✅ You have...

  • A Bachelor's degree in Computer Science or a related technical field
  • A solid foundation in computer science with strong competencies in data structures, algorithms, and software design
  • Programming experience in Swift

⭐ Exceptional candidates will have...

  • Strong proficiency in Swift, with proven ability to build and maintain production-level applications
  • Strong technical knowledge of iOS mobile application development for iPhone/iPad using Swift with Cocoa Touch and related frameworks
  • Experience designing clean and maintainable APIs
  • Experience with multithreaded programming
  • Experience writing unit tests and testable code
  • Knowledge of iOS SDK performance tools and optimization techniques


We post a multi-level salary range for all of our roles.

This is not inclusive of the rest of our awesome portfolio that includes equity compensation and world-class benefits. Our salary ranges are the same for all US locations. Your recruiter can share more details about the range for a specific level during the hiring process. The actual salary within the range is determined by many factors including but not limited to, skills, experience, education, and internal equity.

Salary Range:
$177,700$240,400 USD

Take a peek at how we care for our employees' holistic well-being with our benefits here.

We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact accommodations@duolingo.com.

Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.

By applying for this position your data will be processed as per the Duolingo Applicant Privacy Notice.

Unfortunately, there is a rise in scammers pretending to be real Duolingo employees. Duolingo and our employees will never ask for your Social Security number, bank details, or passport info, and we'll never ask you to deposit a check, purchase equipment, or exchange money during the interview process. Real Duolingo employees always use an email that ends in @duolingo.com or @recruiting.duolingo.com. Stay alert and double-check these details before sharing any information.

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Warsaw, Poland

110 - 140 PLN/hr

🏢 Summary: Long-term B2B contract for a senior iOS Developer to build and enhance a banking mobile application using Swift and SwiftUI within Scrum-based product teams. The role focuses on developing new features, designing application architecture, ensuring code quality through automated testing, and collaborating closely with cross-functional teams. Work is primarily remote with periodic on-site meetings in Warsaw. 🗂️ Requirements: Minimum 5 years experience in iOS development, Very good knowledge of Swift, Experience with SwiftUI and Swift Concurrency, Knowledge of Apple ecosystem (iOS, macOS), Experience in mobile application architecture design, Experience in automated and unit testing, Knowledge of design patterns, Experience with CI/CD, Proficiency with Git, English for technical documentation 📃 Skills: Swift, SwiftUI, SwiftConcurrency, iOS, macOS, Git, CI/CD, Scrum, Objective-C, DevOps 🏢 Description: W ITLT pomagamy naszym zaprzyjaźnionym firmom przekształcać ambitne pomysły w cyfrową rzeczywistość. Z nastawieniem na wyzwania, ciekawość technologii i zwinność współtworzymy wyjątkowe rozwiązania IT i zapewniamy doświadczone osoby eksperckie, które pomagają przyspieszać cyfrową transformację. Aktualnie poszukujemy profilu na stanowisko: iOS Developer Informacje organizacyjne: Lokalizacja biura: Warszawa Tryb realizacji usług: zdalnie + 1 x 2 tyg. spotkania w biurze Forma współpracy: kontrakt b2b, zaangażowanie stabilne, długofalowe Stawka: 110 - 140 PLN netto + Vat/h Sektor: bankowość (obszar kanałów cyfrowych i aplikacji mobilnej) Model współpracy: dwa zespoły produktowe (ok. 8–10 osób) złożone z developerów iOS, Android, .NET, React oraz testerów. Ścisła współpraca z Product Managerem. Praca w Scrumie w 2-tygodniowych sprintach. Języki: codzienna współpraca z polskojęzycznym zespołem, angielski wykorzystywany do pracy z dokumentacją techniczną Zakres zadań: rozwój i implementacja nowych funkcjonalności w aplikacji iOS z wykorzystaniem Swift oraz SwiftUI udział w projektowaniu i rozwijaniu nowoczesnych rozwiązań dbanie o jakość kodu poprzez tworzenie testów automatycznych i jednostkowych monitorowanie i rozwiązywanie problemów technicznych współpraca z zespołem produktowym, developerami oraz testerami w środowisku Scrum udział w pracach projektowych, programistycznych i wdrożeniowych Oczekiwania: min. 5 lat doświadczenia w tworzeniu aplikacji na platformę iOS bardzo dobra znajomość Swift (w tym SwiftUI oraz Swift Concurrency) dobra znajomość ekosystemu Apple (iOS, macOS) doświadczenie w projektowaniu architektury aplikacji mobilnych doświadczenie w tworzeniu testów automatycznych i jednostkowych znajomość wzorców projektowych oraz dobrych praktyk wytwarzania oprogramowania doświadczenie w pracy z CI/CD dobra znajomość Git znajomość języka angielskiego umożliwiająca pracę z dokumentacją techniczną Mile widziane: znajomość Objective-C podstawowa znajomość zagadnień DevOps Oferujemy: długofalową współpracę w oparciu o kontrakt B2B szansę na rozwój w dużej strukturze, bezpośredni kontakt z Managerem zespołu pracę w firmie, w której IT jest dojrzałe i globalne, a metodyki zwinne są respektowane dopłatę do karty MultiSport oraz ubezpieczenia godziny startu pracy 7:30 - 9:30 sprawny proces rekrutacyjny (wideokonferencja), maksymalnie 2 spotkania online (pierwsze z kimś z zespołu, drugie z Managerem) Agencja zatrudnienia - nr certyfikatu 14181

Technology

New offer

Speechify

Software Engineer, iOS Core Product - Boise, ID, USA

Senior

On-site

Boise, ID

🏢 Summary: Senior iOS Engineer role focused on building and scaling Speechify’s iOS application in a fully remote, fast-growing environment. The position involves leading engineering decisions, shipping production code, contributing to product strategy, and improving complex app architecture. Candidates should have strong Swift and SwiftUI expertise, experience with scalable products, and familiarity with CI/CD and multithreading. 🗂️ Requirements: Experience building products at large scale, Experience taking products from inception to traction, Strong Swift programming skills, SwiftUI experience, Experience with multithreading programming, Experience working with CI/CD infrastructure, Experience with Fastlane, Knowledge of SOLID principles, Experience with Git and Git strategies, Ability to work in a fast-paced remote environment 📃 Skills: Swift, SwiftUI, Fastlane, Git, CI/CD, iOS, Multithreading, SOLID 🏢 Description: The mission of Speechify is to make sure that reading is never a barrier to learning. Over 50 million people use Speechify's text-to-speech products to turn whatever they're reading – PDFs, books, Google Docs, news articles, websites – into audio, so they can read faster, read more, and remember more. Speechify's text-to-speech reading products include its iOS app, Android App, Mac App, Chrome Extension, and Web App. Google recently named Speechify the Chrome Extension of the Year and Apple named Speechify its App of the Day. Today, nearly 200 people around the globe work on Speechify in a 100% distributed setting. These include frontend and backend engineers, AI research scientists, and others from Amazon, Microsoft, and Google, leading PhD programs like Stanford, high growth startups like Stripe, Vercel, Bolt, and many founders of their own companies. Overview With the growth of our iOS app, being the #18 productivity app in the App Store category and also our recent recognition as Apple's 2025 Design Award for Inclusivity, we find the need for a Senior iOS Engineer to help us support the new user base as well as work on new and exciting projects to push our mission forward. This is a key role and ideal for someone who thinks strategically, enjoys fast-paced environments, is passionate about making product decisions, and has experience building great user experiences that delight users. We are a flat organization that allows anyone to become a leader by showing excellent technical skills and delivering results consistently and fast. Work ethic, solid communication skills, and obsession with winning are paramount. Our interview process involves several technical interviews and we aim to complete them within 1 week. What You'll Do - Opportunity to lead key engineering and product decisions - Actively shipping production code for the Speechify iOS app - Work within a dedicated product team - Participate in product discussions to shape the product roadmap - Maintain and enhance the existing complex app architecture An Ideal Candidate Should Have - Experience working on products that scaled to a large user base - Track record of working on products from inception to traction - Customer obsession and focus on delivering excellent user experiences - Product thinking and ability to support internal teams and designers - Ability to work quickly and prioritize effectively - Ability to stay focused in a high-growth remote startup environment - Strong technical skills in Swift and SwiftUI Technical Requirements - Swift Programming Language - SwiftUI experience - Experience in Multithreading Programming - Working with CI/CD infrastructure - Experience with Fastlane - SOLID principles and ability to write classes according to SOLID - Experience with Git and understanding of different Git strategies What We Offer - A fast-growing environment where you can help shape the company and product - An entrepreneurial crew that supports risk, intuition, and hustle - The opportunity to make a big impact in a transformative industry - A competitive salary, a collegiate atmosphere, and a commitment to building a great asynchronous culture - Work on a product used by millions of people - Support people with learning differences like Dyslexia, ADD, Low Vision, Concussions, Autism, and Second Language Learners - Work in one of the fastest growing sectors of tech: Artificial Intelligence and Audio The United States based salary range for this role is 140,000–200,000 USD/year + bonus + stock depending on experience. Speechify is committed to a diverse and inclusive workplace. Speechify does not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status.