Senior Front End Engineer (React)

Join Ajax Systems, a leading international technology firm and the largest manufacturer of security systems in Europe. With over 4.5 million end-users and 330,000 PRO-users across more than 180 countries, our innovative products provide comprehensive solutions for safeguarding residential and commercial properties of all sizes. Our portfolio includes 280 dev…

The Senior HR Generalist serves as a vital HR partner for designated business functions in Ukraine, facilitating the effective execution of HR strategies and initiatives while promoting a consistent employee experience throughout the entire employee lifecycle.This role encompasses comprehensive HR support for both employees and managers, spanning crucial HR domains such as talent and performance management, learning and development, employee engagement and culture, employee relations, and the implementation of HR policies that align with company standards.Main ResponsibilitiesHR Business Partnering:Act as the primary contact for employees and managers regarding HR-related inquiries.Function as the HR Business Partner for assigned functions (Execution, IT, Commercial).Guide managers on people-related choices and HR methodologies.Assist in organizational effectiveness and workforce planning initiatives.Provide HR assistance during organizational changes and initiatives.Talent and Performance Management:Oversee the learning and development lifecycle, including needs analysis and the development and execution of the local L&D agenda, as well as the implementation of regional initiatives in Ukraine.Facilitate local calibration of performance and talent review sessions for assigned functions and support subsequent action planning.Document HR processes and prepare reports related to personnel activities (training, performance evaluations, etc.).Conduct local training sessions for employees.Plan and track the learning and development budget for Ukraine.Engagement & Communication:Foster employee engagement and manage internal communications.Lead Employee Engagement Surveys (if applicable), interpreting results and presenting insights.Initiate and execute local engagement action plans.Oversee Employee Assistance Programs and well-being projects in Ukraine.HR Planning & Operational Support:Support HR planning and operational processes, including budgeting, compensation and benefits activities, and the implementation of HR projects in alignment with business priorities.Additional Responsibilities:Apply various policies, rules, procedures, and regulations relevant to assigned functions.Review, interpret, and propose improvements to policies, processes, or programs.Ensure compliance with applicable rules and regulations.Manage special projects as needed.Actively support the Company’s Safety, Health, and Environmental systems and objectives.

Role overview Sigma Software Group is hiring a Senior DevOps Engineer in Kyiv to focus on cybersecurity solutions. This role centers on designing, implementing, and maintaining secure, scalable infrastructure that supports the company’s cybersecurity platforms. What you will do Develop and maintain infrastructure that safeguards and scales cybersecurity products Collaborate with cross-functional teams to enhance system integrity and ensure high availability Drive continuous improvements in both security and operational efficiency Requirements Proactive and creative problem-solving skills Ability to adapt to shifting priorities Solid experience with DevOps methodologies and cybersecurity fundamentals This position plays a key part in helping Sigma Software Group deliver dependable cybersecurity services and protect essential client systems.

Atto Trading is an innovative quantitative trading firm leading the charge in global high-frequency trading strategies. We are on the lookout for a skilled C++ Software Engineer to become a vital part of our expanding team.This role offers the flexibility of remote work from Ukraine, with occasional in-office attendance in Kyiv as circumstances permit.Our international team is diverse, comprising experts in trading, statistics, engineering, and technology. Our structured approach, combined with rapid feedback from the market, enables us to swiftly transform concepts into profitable solutions. Working in our collaborative environment allows us to tackle some of the most challenging issues in the industry together. As a small firm, we maintain agility and uphold the highest standards of integrity, creativity, and dedication.Your Responsibilities:Architect and implement performance-critical components for our large-scale trading infrastructure.Develop high-frequency trading (HFT) systems in C++ focusing on low latency and unwavering reliability.Produce modern, efficient code based on the latest C++ standards.Engage directly with cutting-edge networking hardware using kernel-bypassing drivers.Conduct performance research aimed at enhancing the speed and scalability of our platform.Qualifications:Minimum of 3 years of direct experience in C++ development.In-depth understanding of C++ standards (C++14, C++17; C++20 knowledge is highly desirable).Practical experience with Python and/or Bash scripting.Familiarity with Linux operating systems and system-level programming.Strong understanding of multithreading, IPC, and concurrent systems.Proven ability to optimize latency and throughput, including experience with profiling and PGO.Knowledge of object-oriented programming and software design patterns.Bachelor’s degree in Computer Science, Computer Engineering, or a related technical discipline.Meticulous attention to detail, coupled with a critical and quality-oriented mindset.Able to work independently or within small teams in a fast-paced environment.Excellent communication skills and upper-intermediate (or higher) proficiency in English.A genuine curiosity and passion for financial markets and trading.Preferred Qualifications:Experience in developing high-performance, low-latency systems on Linux.Familiarity with operating system internals and kernel-level networking.Understanding of financial instruments such as stocks, ETFs, futures, or options.Knowledge of protocol-level networking (TCP/UDP/IP stack insights are a plus).Benefits:Competitive compensation package.Performance-based bonus opportunities.Healthcare and sports/gym budget.Mental health support, including access to therapy.Paid time off (25 days).Relocation support (where applicable).

Skelar is a pioneering Ukrainian venture builder dedicated to developing international tech businesses. Together with our co-founders, we assemble strong teams to excel in global markets.Currently, Skelar boasts numerous businesses across various niches—from EdTech to marketplaces. Our ventures consistently rank among the top startups and product companies in Ukraine, achieving high rankings in the App Store and developing platforms utilized by millions. Our businesses have been featured in leading media outlets like TechCrunch and Wired.We take pride in our robust team of over 1000 specialists, all possessing exceptional expertise and ambitious goals. Our people are our most valuable asset, and we strive to build businesses alongside the top talents in the market.We are excited to announce the launch of a new product and are on the lookout for a Senior User Acquisition Manager to lead our Meta Ads strategy (initially web2web, followed by web2app).We are seeking not just an executor, but a future leader who is eager to build this direction from the ground up, with the potential to become a manager for three exceptional User Acquisition Managers (each with their own source) within 6-8 months. This is an opportunity to develop a strategy from scratch and acquire the necessary resources for large-scale experiments that leverage accumulated experience into business results.Key Challenges Ahead:Establishing infrastructure for launching paid Meta traffic (and other channels) as part of the new business launch with web2web and web2app acquisition;Launching the first Meta Ads traffic for the product and collaborating with the product marketing and creative teams to find the unit economics;Building a system for stable and continuous testing of marketing hypotheses to find the product-market fit in priority markets;Becoming a mentor for the current User Acquisition team, providing practical experience and enhancing their performance;What We Value:3+ years of experience with Meta Ads in B2C SaaS products (practical experience with Google Ads and TikTok Ads is a plus);Successful track record of managing advertising budgets (from $500,000/month);Data-driven approach to hypothesis validation, always tracking metrics during launches;Appreciation for unconventional approaches, particularly regarding tests and intriguing cases;Initiative and a desire to grow quickly into a people manager role;Intermediate English proficiency (B1+);

Join Simulmedia, a pioneering company in data-driven advertising, where we leverage cutting-edge analytics and machine learning to enhance ad placements and campaign efficiency. Our goal is to transform the advertising landscape, empowering brands to connect with their audiences more effectively.Job Overview:We are on the lookout for a passionate and skilled Senior Data Scientist to become an integral part of our innovative team. The ideal candidate will possess extensive knowledge in supervised learning, reinforcement learning, and optimization methodologies. You will be instrumental in crafting and deploying sophisticated machine learning models, generating actionable insights, and refining our advertising strategies.This position is based in Ukraine, with a primarily remote work setup and occasional in-person meetings in our offices located in Kyiv or Lviv.Core Responsibilities:● Develop and implement state-of-the-art supervised and reinforcement learning models to enhance ad targeting and boost campaign outcomes.● Collaborate with interdisciplinary teams to pinpoint opportunities for applying machine learning and optimization strategies to address business challenges.● Engage in comprehensive data analysis and feature engineering to prepare datasets for machine learning endeavors.● Utilize optimization algorithms to maximize the impact and efficiency of advertising campaigns.● Assess and enhance existing models to improve their accuracy, efficiency, and scalability.● Leverage statistical methods and machine learning techniques to analyze large, complex datasets.● Effectively communicate findings and recommendations to both technical and non-technical audiences.● Stay abreast of the latest developments in machine learning, reinforcement learning, and optimization practices.● Collaborate with engineering teams to integrate models into production systems.

Role overview Sigma Software Group is hiring a Senior Business Analyst in Kyiv to focus on AI-driven solutions. This role connects business priorities with technology, supporting projects that apply artificial intelligence to address client needs. What you will do Collaborate with cross-functional teams to gather and document business requirements for AI projects Translate complex business objectives into clear, actionable insights for technical teams Contribute to the direction and impact of AI initiatives, with the goal of improving efficiency and client results

Welcome to Leaply, a dynamic and rapidly expanding ecosystem of digital and physical products aimed at empowering individuals to cultivate healthier habits and enhance their lives. Since our launch in 2024, we have experienced remarkable growth, achieving a 10x revenue increase in just six months, with significant traction across the US, Europe, and beyond.At Leaply, we redefine conventional career trajectories — prioritizing ownership over titles and impact over bureaucratic processes. Our team is fast-paced, ambitious, and we encourage every member to contribute beyond their defined roles.We are in search of a strategic and analytical User Acquisition Manager to elevate our growth initiatives. In this pivotal role, you will take charge of our acquisition strategy, explore new funnels, and collaborate with product and creative teams to translate insights into tangible business outcomes. This position offers a substantial opportunity for rapid advancement into a leadership role.Key Responsibilities:— Initiate, oversee, and scale Meta (Facebook & Instagram) campaigns in Tier 1 markets— Monitor and optimize critical metrics — CAC, LTV, ROI — to directly impact revenue growth— Develop and refine automated workflows for campaign management, creative testing, and reporting— Collaborate effectively with Creative, Growth, and Product teams— Proactively propose and test new hypotheses to drive performance improvementsYou’re a Strong Candidate If You:— Have 3+ years of experience in performance marketing with hands-on expertise in Meta Ads, Google Ads, TikTok Ads— Possess strong analytical and structured thinking abilities, with a knack for transforming data into actionable strategies— Exhibit a test-and-learn mentality, thrive in a fast-paced environment, and adapt quickly— Are proficient in B2+ English, comfortable engaging with English-speaking markets— Balance creativity and logic — adept at brainstorming bold ad concepts while calculating CAC seamlesslyBonus Qualifications:— Familiarity with tools such as Tableau, Airtable, Amplitude, AppsFlyer— Experience in Tier 1 markets including the US, UK, Canada, Australia— Comfort with AI tools like ChatGPT or NotebookLM— Background in fast-growing B2C startupsWhat We Offer:— Competitive salary— Opportunity to work from our offices in Warsaw or Kyiv, complete with perks (including lunches, gym access, and health insurance)— Full ownership of your performance area and input on growth strategy— Support from a seasoned team with a track record of multiple successful exits

SKELAR is a prominent Ukrainian venture builder focused on creating international tech businesses. Together with our co-founders, we assemble strong teams to excel in global markets.Currently, SKELAR has a diverse portfolio of businesses across various niches, from EdTech to marketplaces. Our companies consistently rank among the top startups and product companies in Ukraine, achieving high standings in the AppStore and developing platforms used by millions worldwide. Our ventures have been featured in leading media outlets such as TechCrunch and Wired.We are seeking a Senior Product Manager (Retention) for our partner business, TENTENS Tech. This role will focus on developing retention strategies and driving user return growth.TENTENS Tech is a Ukrainian IT company specializing in streaming and social discovery platforms. Our team has successfully launched numerous platforms that are utilized by millions around the globe (except Antarctica, for now).Our motto, “We don’t think limits,” reflects both our strategic vision and the motivation of our team to push beyond the horizon.Key Challenges:Developing and implementing a robust Retention Marketing strategy.Generating, prioritizing, validating, launching, and analyzing a multitude of hypotheses regarding retention channel logic.Systematically enhancing key product metrics linked to user activation, retention, and return.Advancing the recommendation system logic for sending emails, SMS, and web push notifications through our proprietary ESP system.Initiating and developing new user retention channels.Conducting regular user and market research to discover new growth opportunities for the product.Taking responsibility for strategic development and actively participating in setting departmental goals.What We Value:Must-haves:At least 2 years of experience in product management, user growth, or retention/CRM initiatives.Analytical mindset and ability to make data-driven decisions (collecting, analyzing, and interpreting data to enhance product and strategic planning).Proficiency in creating technical specifications for development.Proven track record of achieving business objectives through the validation of product hypotheses.

Ajax Systems—a leading international technology company and the largest developer and manufacturer of security systems in Europe, specializing in smart home solutions. Our ecosystem consists of 180 devices, along with mobile and desktop applications, and a robust server infrastructure. Each year, we experience exponential growth in both our team size and user base worldwide, currently employing over 4,100 professionals. Ajax sensors safeguard 4 million users across more than 187 countries.Our R&D division is responsible for device development, comprising four departments: System, Device, Automation, and QA.The Device Department focuses on creating advanced security and automation devices, tackling significant challenges in areas such as:- Low-Power: Our devices are designed for extended battery life;- Cost Efficiency: Our mass-market products are priced competitively;- DFM (Design for Manufacturing) and DFH (Design for Humans): Our schematics, casings, and other components are engineered for easy mass production without compromising quality.We primarily develop using STM32 microcontrollers (along with other MCUs and SoCs) utilizing Embedded C. Our team comprises highly skilled hardware engineers, Embedded C specialists, industrial designers, and mechanical engineers.We are seeking a Senior Wireless Embedded Engineer specializing in the development of embedded network software for video device hardware platforms (BSP) based on Embedded Linux, utilizing wireless WiFi solutions for video streaming. The ideal candidate will be experienced, proactive, and eager to implement cutting-edge solutions.

SKELAR is a venture builder dedicated to creating international product IT companies following the principles of venture investment. We collaborate with co-founders to assemble strong teams that launch product-based IT businesses and succeed in global markets.We are currently seeking a Senior DevOps Engineer to join our partner company, Duomo. Duomo is a platform for personal and spiritual development grounded in Christian values. We assist individuals in finding answers to the most significant questions in life, from deepening their faith to enhancing relationships with loved ones through personalized plans. Our users gain access to lessons, interactive quizzes, and video materials that create a comprehensive learning experience.Our mission is to become a global platform where tens of millions of Christians, hundreds of organizations, and thousands of mentors and pastors can connect.Key achievements we take pride in:Users love us: an average rating of 4.7/5 on App Store, Google Play, and Trustpilot.We are rapidly growing: our team has quadrupled in size over the past year.We are a partner of Meta, which confirms the high quality of our product and trust from technology leaders.We are evolving at an incredible pace, and every team member has the opportunity to grow quickly alongside the company—both professionally and personally. The company supports learning through mentoring, internal educational initiatives, and access to external courses.Notably, we extensively integrate AI tools into all processes. We already use integrations with MCP servers in everyday tools, AI Code Review, and automation of key routine tasks. This allows us to focus on creativity and innovation instead of routine.As the first DevOps Engineer, you will have the chance not only to actively influence decisions and implement them but also to lead the infrastructure direction and build a strong engineering team.Our tech stack includes: AWS, RDS (Aurora Postgres), ElastiCache (Redis), ECS, EKS, CloudFlare, Terraform.

Join Ajax Systems as a Procurement Executive and become a vital part of our international team that is revolutionizing the security industry. In this role, you will oversee procurement operations, enhance supplier relationships, and contribute to our mission of providing innovative security solutions. Your expertise will support our growth trajectory as we expand our product offerings and market presence, ensuring the highest quality standards and cost-effective sourcing strategies.

Who Are We?At Welltech, we are dedicated to our mission of inspiring and empowering individuals to pursue their wellness journey. With a global footprint and roots in Ukraine, we have successfully engaged over 25.5 million users, helping them cultivate healthy habits through our innovative and interactive wellness solutions. Our presence spans five hubs located in Cyprus, Ukraine, Poland, Spain, and the UK, all supported by a dynamic team of over 700 professionals. Our apps, including Muscle Booster, Yoga-Go, and WalkFit, are designed to empower users to transform their lifestyles and embark on personalized wellness journeys.At Welltech, you can make a significant impact. Our core values emphasize collaboration, results-driven efforts, leadership by example, and the ethos of being "well-makers." If you thrive in a fast-paced environment and resonate with our mission, we invite you to join us in shaping the future of wellness.

Ajax Systems is a leading international technology company and the largest developer and manufacturer of Ajax security systems in Europe, integrating smart home capabilities. The Ajax ecosystem features over 180 devices, mobile and desktop applications, and a proprietary server infrastructure. Our products safeguard 3.5 million users across 187 countries, and our team consists of over 4100 employees, continuously expanding. We oversee the complete production cycle, from idea and prototyping to mass production and global sales. Our teams operate across various locations, including R&D and manufacturing in Ukraine, as well as international offices and logistics centers throughout Europe. Currently, we are looking for a Middle/Senior Recruiter to help scale our teams in key business functions. You will be part of the Business Unit recruitment team, responsible for sourcing specialists in the following areas: Business Excellence Security Marketing Finance Supply Chain People Management Legal The team consists of 3 Recruiters, 2 Talent Sourcers, and a Team Lead. This role involves close collaboration with business line leaders and C-level executives, influencing hiring decisions and working across various roles, from expert to leadership positions. Moreover, you will have the opportunity to engage in international hiring and technical roles for Ajax Systems teams in Ukraine and other countries.

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.

Please be aware that this position requires relocation to our Milan office.About SatispaySatispay is transforming the way people make everyday payments, striving to make them straightforward, equitable, and accessible to all. Our mission has evolved to redefine the future of finance.As a movement, we empower millions, united by a common goal to address significant challenges. We are just at the beginning of our journey. Our pace is swift, our ideas are bold, and we foster an environment of trust where we challenge the status quo, learn, and grow together.As a member of the Core Team, you will engage with vital systems, managing connections with external banking entities, orchestrating payment processes, and establishing the essential infrastructure for Identity and Access Management (IAM). Moreover, the team oversees risk-related services, particularly in credit risk management and fraud detection.If you aspire to build impactful solutions that serve as the bedrock for all our product teams, you are in the right place.What You Will DoAs a Senior Backend Software Engineer within the Core Team, you will be instrumental in developing the core architecture of our payment platform. You will ensure the technical excellence and timely delivery of intricate systems that affect various services and product teams throughout the organization.Your daily responsibilities will include:Engineering Core Platform Domains: Contribute to the design and enhancement of our most sensitive systems, such as the Transaction Ledger, IAM, and Payment Orchestration. You will ensure these systems are high-performing, scalable, and functional for seamless integration by our product teams.Scaling Risk & Financial Engines: Optimize and implement services focused on bank integrations, credit risk, and real-time fraud detection. You'll create the robust logic that safeguards our

Join our dynamic team at Tietoevry as a Senior DevOps Engineer specializing in OpenShift and on-premise solutions. In this role, you will leverage your expertise to enhance our cloud infrastructure, ensuring scalability, reliability, and security. You will work closely with development teams to automate and streamline our operations and processes.As a key player in our DevOps team, you will be responsible for implementing CI/CD pipelines, managing cloud resources, and troubleshooting system issues. Your knowledge of containerization and orchestration will drive our projects forward, helping us stay at the forefront of technology.

Role Overview Welltech is seeking a Senior Legal Counsel with deep experience in Intellectual Property and Artificial Intelligence. This position is based in Ukraine and focuses on guiding legal strategies that protect and advance Welltech’s technology and products. What You Will Do Advise on intellectual property protection for new and existing products Support compliance efforts related to AI and IP regulations Identify and manage legal risks connected to technology development Work closely with product and engineering teams to safeguard Welltech’s intellectual assets About the Team This role is part of Welltech’s legal team, contributing directly to the company’s mission of advancing technology while protecting its innovations.

At Skelar, we proudly celebrate the phrase: “Offer accepted!” as part of our daily achievements in the Talent Acquisition team.We are striving towards ambitious goals not only to sustain our growth but also to establish the leading recruitment system in the country.We are building a team of specialists who are not just executors but true business partners. These professionals engage with hiring managers to understand the context and influence hiring decisions.Identifying and attracting the strongest talents in the market is a shared cultural challenge for every employee at Skelar. Together, our collaborative efforts shape the future of Skelar, as the individuals hired today will determine our trajectory in five years.Utilizing various tools for sourcing and attracting candidates, taking a data-driven approach, and learning from 35 colleagues in our team (meet us on LinkedIn: Olesia, Oksana, Maxim, Katya) — we have created a robust ecosystem of opportunities to help you surpass your own challenges.As for the challenges ahead:— Develop and implement candidate sourcing strategies (from junior to top management roles);— Collaborate with hiring managers to open vacancies, assist in defining the ideal candidate profile, and gather all necessary information;— Conduct interviews using modern approaches to evaluate candidates based on job requirements;— Support candidates throughout all stages of the recruitment process;— Work with ATS (BreezyHR), analytical dashboards, and automation tools;— Stay updated on the latest recruitment trends, seek and implement growth hacking solutions to reduce time to fill and cost per hire;— Expand your network and create talent pools through headhunting.You will be attracting product managers, analysts, designers, engineers, and various specialists to a company recognized as the #1 employer in Ukraine by DOU.Key skills important for this process:— At least 2 years of experience in full-cycle recruitment: from sourcing to hiring;— Ability to work in a smart hybrid format in Kyiv, Lviv, or Warsaw;— Experience in...

nix collaborates with a global leader in corporate brand protection and domain management. The client supports Fortune 500 companies and large enterprises by providing domain registration, online brand monitoring, and anti-counterfeiting services. Their work centers on securing digital assets at scale. A new project is underway to combine two legacy client portals into a single platform. The team aims to preserve all current features during the transition. The technology stack includes PHP (Laravel), RabbitMQ, MySQL, and Nuxt.js (Vue.js), all deployed on AWS. Role overview The Senior Automation QA Engineer (Java) will architect and build a comprehensive test automation framework from scratch. This framework will support regression, API, and end-to-end testing for the unified platform. What you will do Design and implement a test automation framework using Java Develop tests for regression, API, and end-to-end scenarios Ensure coverage across the new unified platform Project stack PHP (Laravel) RabbitMQ MySQL Nuxt.js (Vue.js) AWS