Software Engineer at AppsFlyer | Kyiv

At AppsFlyer, we place data at the core of our operations, processing over 150 billion events daily, and we’re rapidly expanding. Our dedicated team builds the essential frameworks that support this growth. Unlike conventional Data Engineering teams, we function as a Software Development team, creating internal services and tools for Data Engineers and other Software Development teams. We are at the forefront of transitioning from a Data Lake to a Data Mesh architecture, providing: Massive-scale data ingestion services Data operations within a Mesh architecture Tools that empower other teams to create reliable, cost-effective, and high-performing data pipelines By working at the intersection of Software Engineering, Data Engineering, and DevOps, we design, build, and maintain the core services that drive AppsFlyer’s data ecosystem.

Our Mission and VisionAt Solidgate, we are dedicated to empowering exceptional entrepreneurs to create outstanding internet companies. Our goal is to support the builders of the digital economy with the financial infrastructure they truly deserve. We are on an ambitious journey to become the world's leading payments orchestration platform.About the Team and RoleAs a Node.js Engineer on the Launch Team, you will be instrumental in powering the backend for Digital Onboarding. Your primary mission will be to ensure that Solidgate collaborates with compliant merchants while delivering a fast, seamless, and scalable onboarding experience.Your challenge will be to construct the quickest path from “I’m interested” to “I’m live.”What Makes This Role UniqueYou will significantly decrease Time-to-Live, positively influencing growth.You will help define the evolving Node.js stack (free from legacy constraints).You will design robust, durable, and scalable systems that target an impressive 99.99% uptime.You’ll harness AI to expedite shipping and integrate AI-driven features into our products.Technology StackOur Launch Team is at the forefront of Solidgate's Node.js stack development. We not only implement tools but also establish the standards, practices, and engineering culture that other teams aspire to follow. Currently, we utilize:Fastify - a lightweight, high-performance web servergRPC + Protobuf - for typed service-to-service communicationPostgreSQL + Drizzle ORM - a reliable data layer with a modern query builderKafka (@platformatic/kafka) - for streaming-first, event-driven architectureVitest - for unit and functional testingWe also implement custom solutions, including distributed locks, metrics, streamers, and more. Discover our complete technology stack here.The tech stack is continuously evolving, providing real influence without any legacy baggage, just modern Node.js supported by mature architectural principles inspired by the Golang ecosystem.Your ResponsibilitiesDevelop and maintain backend services for a seamless onboarding process.Collaborate with cross-functional teams to ensure high-quality deliverables.Optimize application performance and reliability.Leverage modern development practices and tools to enhance efficiency.

Superhuman embraces a flexible hybrid working model for this position, allowing team members to enjoy focused work time while also benefiting from in-person collaboration that nurtures trust, innovation, and a robust team culture.About SuperhumanSuperhuman, which includes Grammarly as part of its offerings, is an AI-driven productivity platform dedicated to unlocking the superhuman potential in everyone. Our suite of applications seamlessly integrates AI into daily workflows, connecting with over a million applications and websites. Our flagship products feature Grammarly’s writing assistance, Coda’s collaborative workspaces, Mail’s inbox management, and Go, the proactive AI assistant that offers contextual help automatically. Since our founding in 2009, Superhuman has empowered more than 40 million individuals, along with 50,000 organizations and 3,000 educational institutions worldwide, to eliminate busywork and concentrate on what truly matters. Discover more at superhuman.com.The OpportunityAs we pursue ambitious goals, we are seeking a Site Reliability Engineer (SRE) to join our infrastructure team. This role will focus on developing software to guarantee the reliability of our backend systems, collaborating closely with engineers in charge of these systems, and strategizing for our future expansion. You will collaborate with our existing production engineering teams in the EU as we shift from a “you build it, you own it” paradigm.At Superhuman, engineers and researchers are encouraged to innovate and discover breakthroughs, which directly impacts our product roadmap. As we scale our interfaces, algorithms, and infrastructure, the complexity of our technical challenges is rapidly increasing. Explore more insights from our team on our technical blog.As an SRE, your responsibilities will include:Scaling our Kubernetes-based control plane that handles billions of events daily.Enhancing our automation mechanisms to respond effectively to workload demands.Implementing Machine Learning systems across the organization.

Join our innovative team at Sigma Software Group as a Data Engineer! In this dynamic role, you will leverage your expertise in data architecture and engineering to design and implement robust data solutions that drive informed decision-making across various projects.As a Data Engineer, you will collaborate with cross-functional teams to understand data requirements, develop data pipelines, and ensure data integrity and accessibility. Your work will empower stakeholders to derive valuable insights and contribute to the overall success of our projects.

Our Mission and VisionAt Solidgate, we are dedicated to empowering visionary entrepreneurs in building exceptional internet companies. Our goal is to provide the financial infrastructure necessary for these innovators to thrive in the digital economy. We aim to establish ourselves as the leading payments orchestration platform globally.About the Team and RoleWe are seeking a talented Frontend Engineer to join our dynamic Finance Engineering team. This team is responsible for developing a robust finance system, essentially a powerful calculator that ensures the accurate and timely processing of payments for our merchants. With over 18 million payments processed monthly, your work will directly influence automated payouts and financial reporting.Why This Could Be Your Next Big MoveMeaningful Impact: Contribute to a mission-critical platform that shapes the financial landscape of our services.Collaboration with Industry Experts: Work alongside engineers with experience from Amazon, Revolut, Wix, and other leading companies.Autonomy and Ownership: Take full ownership of your projects from inception to deployment, allowing you to witness the direct impact of your contributions.AI-Enhanced Development: We prioritize developer productivity by providing tools like GitHub Copilot, Windsurf/Cursor, and Coderabbit to streamline your coding process and reduce repetitive tasks.Why Now is the Ideal Time to Join UsWe are building a next-generation financial system from the ground up, focusing on modular and transparent fee calculations while laying the groundwork for future financial modules.Explore our technology stack here.Your ResponsibilitiesEnhance the platform: Develop frontend solutions for new financial configurations, supporting various contract types and commission models.

Superhuman offers a vibrant hybrid working model for this position. This flexible approach allows our team members to enjoy focused work periods while also benefiting from in-person collaboration that nurtures trust, innovation, and a robust team culture.About SuperhumanSuperhuman, now part of Grammarly, is an AI productivity platform dedicated to unlocking the extraordinary potential within everyone. Our suite of applications and agents integrates AI into everyday workflows, collaborating with over 1 million applications and websites. Our offerings include Grammarly's writing assistance, Coda's collaborative workspaces, Mail's inbox management, and Go, a proactive AI assistant that understands context and delivers timely help. Established in 2009, Superhuman empowers over 40 million individuals, 50,000 organizations, and 3,000 educational institutions globally to eliminate busywork and concentrate on what truly matters. Discover more at superhuman.com and explore our values here.The OpportunityTo meet our ambitious objectives, we are seeking talented Back-End Software Engineers to join our engineering teams. Superhuman's engineers and researchers are empowered to innovate and discover breakthroughs that shape our product roadmap. As we scale our interfaces, algorithms, and infrastructure, we are faced with increasingly complex technical challenges. You can learn more about our work on our technical blog.As a Back-End Engineer at Superhuman, you will be instrumental in developing the core components of our product offerings, infrastructure, and features that assist 30 million users in writing with clarity and effectiveness every day.In this role, you will:Begin writing and deploying code in your first week and launch impactful features within your initial months.Develop and maintain production services with high call rates.Aim for high availability for both consumer and enterprise clients.Learn to build infrastructure as code (IaC).Collaborate extensively with internal teams like Core, Growth, Enterprise, Trust, and Data to deliver exceptional product experiences.Contribute to an engineering culture that prioritizes documentation, testing, and user experience.Assess existing systems and technologies while proposing enhancements.

Join our dynamic team at wix2 as a Frontend Engineer. In this pivotal role, you will leverage your skills in modern web technologies to create visually appealing and highly functional user interfaces. You will collaborate closely with designers and backend engineers to deliver seamless web experiences that delight our users.

Join our dynamic team in Kyiv as a Linux Software Engineer and be at the forefront of drone technology! This full-time position requires you to work in our office, with a convenient shuttle service available from the nearest metro station.About the RoleAs a vital member of our System Architecture team, you will contribute to the development and maintenance of Linux-based systems that drive our innovative unmanned aerial vehicles at Quantum-Systems. Collaborating with a talented team of three, you will play a pivotal role in advancing drone technologies.You will engage closely with stakeholders from Avionics, Systems Engineering, and Flight Testing to ensure seamless integration of hardware, third-party software, and onboard applications into a robust Linux platform. Your work will ensure a reliable, scalable, and mission-critical software environment, making a significant impact on our operations.Your Daily Responsibilities:Maintain and develop new Linux applications for unmanned aircraft.Design and coordinate interfaces between teams while documenting architecture and design decisions.Integrate hardware and third-party software into the Linux system, collaborating with suppliers and internal teams.Conduct thorough testing of applications, including unit tests, integration tests, functional tests, and acceptance tests.Analyze flight logs from test flights and real-world customer issues.Debug and resolve software and hardware issues related to the Linux system.Enhance the build system, pipeline, and tooling, including creating releases with detailed release notes.Work within an agile environment and adhere to the defined development process.

Join our dynamic Guru Apps team as a Middle+/Senior Software Engineer, where you'll actively engage in the implementation of innovative product experiments alongside our dedicated team.Guru Apps is a multi-product company within Universe Group, focusing on developing global iOS applications in utility and AI niches.Our products streamline the digital routines of millions of users worldwide, offering solutions from memory cleaning to document management on mobile devices, as well as AI tools for image editing and content creation.Over the years, we have achieved remarkable milestones:— Over 100 million downloads— Expanded to 185 countries— Consistently ranked #1 in the App Store, outpacing giants like Google, Netflix, and Instagram— Leading in our niches and setting quality standards in utility and AI categories— Launched our own R&D laboratory, producing at least two new products each year and developing proprietary AI technologies— ⭐ Maintaining an average rating of over 4.6 in the App StoreAt Guru Apps, we prioritize speed, experimentation, and a fervent ambition to build global products infused with Ukrainian innovation. To discover what it's like to work in a community that unites like-minded individuals aspiring to create a Ukrainian unicorn, check out our video about Guru Apps.This role extends beyond coding; you'll collaborate within an R&D-like team to create end-to-end products. Together with your peers, you'll simplify the lives of marketing teams and perform magic on routine and complex processes.You will be part of a team led by the MarTech Team Lead, alongside 3 Backend Engineers and a Frontend Engineer. Read this article by your future manager, detailing unique challenges and solutions that allow the team to optimize their time and accelerate business growth.

Join our dynamic team as a Senior Full Stack Engineer where you will engage in exciting projects that enhance the digital landscape. Your expertise in both front-end and back-end development will play a critical role in delivering high-quality software solutions. Collaborate with a team of talented professionals, leveraging the latest technologies to drive innovation and efficiency.

Join our dynamic Frontend Guild as a Fullstack Infrastructure Engineer at Wix, where you will play a pivotal role in shaping the core engines that facilitate development for all frontend engineers. Your contributions will enable teams to deliver faster and with enhanced quality. You will be responsible for overseeing projects from conception to deployment, impacting a vast scale.Your Responsibilities:Design and implement internal tools aimed at boosting developer efficiency and code excellence.Manage infrastructure solutions that include production testing and performance analysis tools.Guide projects from initial ideas through design, development, and production phases.Incorporate AI technologies into your daily workflow for coding, testing, design, and making informed technical decisions.Utilize contemporary full-stack technologies and top-tier tools.Engage in close collaboration with seasoned engineers on significant projects.Enhance the developer experience throughout the organization.At Wix, we embrace the flexibility of a hybrid work model—offering you the choice to work in the office when necessary while maintaining remote connectivity. We are in search of talented individuals based in Ukraine who can effectively balance in-office and remote collaboration with the Wix team. This approach provides you with the ideal blend of remote flexibility and beneficial in-person teamwork when it counts.

As a Quality Assurance Engineer at Ajax, you will play a pivotal role in ensuring the quality and reliability of our software products. You will work closely with developers to identify and resolve issues, create and execute test plans, and contribute to the continuous improvement of our testing processes.

Role Overview auto1 is hiring a Senior Java Engineer in Kyiv. This role focuses on building and improving Java applications that support our clients' needs. The team values collaboration and technical skill, and works together to deliver reliable software. What You Will Do Develop and maintain Java-based applications as part of a skilled engineering team Mentor junior developers and support their technical growth Contribute to architectural discussions and technical decisions Help ensure software products meet quality standards before release What We Look For Strong experience with Java development Ability to work well in a team and share knowledge with others Interest in shaping technical solutions and making architectural choices Experience mentoring or guiding less experienced engineers is a plus Location This position is based in Kyiv.

Hello, let’s get to know each other better. We are Quarks, a technological company that develops niche products in the areas of Social Discovery & Relationship Wellness. We focus on creating safe and effective solutions for dating and relationship development.Additionally, Quarks is:A team of over 250 QuarksRecognized as a top employer in 2024 by DOUAn eNPS score of 80.4%Having offices in Kyiv, with hubs in Lviv and WarsawOur flagship product, Kismia, is a dating application with over 80 million users across more than 20 locations worldwide. We are also engaged in developing services for marketing, analytics, and moderation.Currently, we are looking for a QA Engineer to join our Internal PaaS team, responsible for development, architecture, QA, DevOps, and other processes that form the technological foundation of our products.We are also open to hiring veterans—creating an environment where you can not just be part of the team, but also grow.Your future tasks:Testing the web application at various stages of the development life cycle (primarily front-end)Identifying, documenting, and tracking defects (bug tracking)Monitoring and supporting already implemented functionalitiesPreparing and updating test documentation (checklists, test cases)Participating in refinement, planning, and estimation processesCollaborating closely with a cross-functional team: developers, AQA, designers, analysts, and PMsWhat we value in this role:At least 1 year of experience in manual testing of web applicationsStrong knowledge of testing theory (types, levels, techniques, etc.)Understanding of the software development life cycle (SDLC)Practical skills in using DevToolsExperience with requirements and technical documentationFamiliarity with tools: Jira, Confluence, TMSBasic understanding of client-server architectureIt would be a plus:Experience in automated testing

Role Overview SKELAR is hiring an Engineering Manager in Kyiv. This role leads a team of engineers, guiding projects from planning through delivery. The manager sets direction for engineering efforts, supports team growth, and encourages strong collaboration across disciplines. What You Will Do Oversee engineering projects, ensuring timely and high-quality delivery Mentor and develop engineers, helping them grow their skills Promote best practices in engineering and team communication Foster a culture of creativity and shared problem-solving Location This position is based in Kyiv.

Join Skelar, a leading venture builder dedicated to crafting innovative IT products that resonate on a global scale.We are currently seeking a Senior/Lead Backend Engineer to spearhead our martech initiatives within our partner company, Duomo. This platform is designed for personal and spiritual development, rooted in Christian values, providing users with customized plans to address pivotal life questions.At Duomo, we strive to create a global community where millions of Christians, organizations, mentors, and pastors can connect and grow together.Our achievements speak volumes:Users love us: Our average ratings across App Store, Google Play, and Trustpilot stand at an impressive 4.7/5.Rapid growth: Over the past year, our team has expanded fourfold.Trusted by Meta: Our partnership with Meta underscores the quality and trustworthiness of our product.We are evolving rapidly, offering every team member the opportunity to grow both professionally and personally. Our commitment to learning includes mentorship, internal education initiatives, and access to external courses.Additionally, we are integrating AI tools throughout our processes, using MCP server integrations, AI Code Review, and automation to enhance creativity and innovation.

Join SKELAR, a pioneering venture builder that crafts international tech businesses. Collaborating with co-founders, we assemble high-performing teams to excel in global markets.Currently, SKELAR boasts a diverse portfolio of businesses across various niches, from EdTech to marketplaces. Our companies consistently rank among the top startups and product firms in Ukraine, achieving high standings in the App Store and developing platforms used by millions. Our innovations have been featured in renowned media outlets such as TechCrunch and Wired.People are our core value. We unite passionate talents who inspire those around them with their drive and determination. We believe that the right environment is crucial, which is why we aim to create the best workplace in Ukraine.We are seeking a Junior Full-Stack Engineer to join us in building modern, intelligent, and adaptable products that will serve as the backbone of our internal processes and help accelerate our growth. This role offers a developer the chance to make a significant impact on product development and witness tangible results from their contributions.We operate like a startup within a company: rapidly testing ideas, engaging extensively with users, and continuously searching for improvement opportunities.Our team is currently expanding as we launch new services, restructure our architecture for scalability, and incorporate AI functionalities that unlock numerous new possibilities.

Join Kyivstar as a Lead Telecommunications Engineer and play a crucial role in shaping the future of telecommunications in Ukraine. In this dynamic position, you will lead innovative projects, ensuring the highest standards of quality and efficiency in our telecommunication systems.

Design, develop, test, deploy, monitor, and maintain our comprehensive service-oriented platform, which comprises over 50 RESTful microservices.Leverage your hands-on experience and proactive problem-solving attitude to tackle intricate challenges.Elevate our technological capabilities and drive innovations to keep AUTO1 at the forefront of the automotive industry.Set a strong example for your team, pushing boundaries and striving for excellence.Engage with diverse engineering and product teams to uphold high business standards while exploring other technologies and software development domains.

SKELAR is a Ukrainian venture builder dedicated to creating international tech businesses. Together with our co-founders, we assemble strong teams to excel in global markets.Currently, SKELAR operates a dozen businesses across various niches, from EdTech to marketplaces. Our companies rank among the top startups and product companies in Ukraine, achieving high placements in the App Store and developing platforms used by millions. SKELAR's businesses have been featured in prominent media like TechCrunch and Wired.We pride ourselves on a strong team of over 1,000 experts with exceptional expertise and ambitious goals. Our people are our most valuable asset, which is why we strive to build businesses together with the best talent in the market.We are currently seeking a General QA Engineer to join our team:Brighterly is an online mathematics school for children. We are building an educational ecosystem to be the “home page” for learning mathematics for kids and their parents. Brighterly is developing the next EdTech unicorn on a market with a potential of $130 billion.Tech stack: https://skelar-tech.github.io/Brighterly/Key responsibilities include:Impacting functionality quality through manual testing of the platform (primarily web-based)Participating in building the automation framework using PlaywrightReviewing task requirements before development to ensure we do not break existing functionalityMonitoring the quality of daily releasesOffering ideas for improving the testing process to identify issues earlyEstablishing efficient QA processes for a global productWhat we value:Ability to document bugs, create structured cases, checklists, and reports that are easy to reproduceExperience with bug tracking systems (Jira, YouTrack, ClickUp, Testomat.io, etc.)Understanding of APIs and approaches to testing them