Lead Java Engineer - Retail Sector (f/m/x)

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

Join Ajax Systems, a leading international technology company and the largest manufacturer of security systems in Europe. Our products are trusted by over 4.5 million end-users and 330,000 PRO-users across more than 180 countries. Ajax offers comprehensive solutions for the protection of residential and commercial properties of all sizes, with a portfolio featuring 280 devices for intrusion prevention, video surveillance, fire safety, and automation. Each year, we experience exponential growth in our team and our global user base.At Ajax Systems, we operate a full-cycle production process: from idea generation and prototyping to mass production and global sales. Each department addresses specific operational needs of the business. Our specialists are involved at every stage, from our production line in Ukraine to our logistics center in Poland, from where products are dispatched to distributors worldwide.As a Middle Data Engineer, you will be responsible for the development, maintenance, and optimization of data processing streams and solutions under the guidance of a Senior Data Engineer (Lead). Your primary goal will be to ensure reliable, high-quality, and scalable data for analytics, machine learning, and business applications.

TENTENS Tech is a dynamic IT partner of SKELAR, a Ukrainian venture builder dedicated to creating international tech businesses.We specialize in developing social discovery platforms for over 20 million users globally. Our momentum and scale are driven by deep expertise in analytics, high-load systems, and performance marketing.Currently, our team at TENTENS Tech consists of more than 250 talented individuals, each operating as a CEO in their role and contributing to the collective success. We embrace a 10/10ths work style: focusing on our goals, asking the right questions along the way, and never settling for 'good'—always striving for excellence and beyond. If this resonates with you and you're ready to accelerate with us, let's connect!We are seeking a Senior/Lead Data Engineer to spearhead the development of a high-load Data Platform that processes over 2500 data streams and up to 9 PB of data monthly.In this role, you will be the technical driving force of the direction and will build a platform that provides teams with scalable, reliable, and user-friendly access to data.

Quantum Systems GmbH develops unmanned solutions for air, land, and sea operations, combining advanced hardware with AI-driven software. The company delivers real-time data and precise control to defense, security, and public sector clients worldwide. Since establishing the Kyiv office in 2022, Quantum Systems has remained committed to supporting Ukraine. Role overview The Service Team Lead manages the Kyiv-based service team, focusing on high-quality repairs, process improvements, and the professional growth of engineers. This is a full-time, on-site position based in Kyiv. Main responsibilities Team leadership Direct and coordinate a team of service engineers and testers. Plan workloads, assign tasks, and set priorities to improve productivity. Mentor, onboard, and guide engineers in their development. Lead technical discussions and review complex cases to find solutions. Quality assurance Ensure all repairs and testing meet company standards. Monitor deadlines, SLAs, and overall service quality. Analyze recurring technical issues and drive improvements to reduce defects. Review and validate complex repairs involving electronics, UAVs, and modules. Process improvement Streamline workflows and introduce industry best practices. Maintain and update checklists, procedures, and technical documentation. Collaborate with Testing, Logistics, Procurement, and R&D teams. Track performance metrics and prepare reports on key KPIs. Technical involvement Help resolve complex engineering challenges as they arise. Make technical decisions in non-routine situations. Oversee repairs of UAVs, electronic modules, and power systems. Location: This position requires full-time, on-site presence at the Kyiv office.

Role Overview Miratech is looking for a Senior Data Engineer in Kyiv. This role focuses on designing, building, and maintaining scalable data architectures that support business growth. The position involves working closely with teams across the company to deliver reliable data solutions. What You Will Do Design and develop data architectures that can scale with business needs Build and maintain data processing pipelines Work with cross-functional teams to deliver data solutions that support business insights Optimize data workflows for performance and reliability Ensure data integrity throughout all processes

Join our dynamic team at Auto1 as a Team Lead Java Engineer in our Remarketing department. In this role, you will lead a talented group of engineers, driving innovation and excellence in our technology solutions. You will be responsible for overseeing the development and implementation of robust Java applications that enhance our remarketing strategies. Your leadership will be crucial in mentoring team members, improving coding standards, and ensuring high-quality deliverables.

SKELAR is a Ukrainian venture builder focused on creating international tech businesses. Alongside our co-founders, we assemble strong teams to conquer global markets.Currently, SKELAR has multiple ventures across various niches—from EdTech to marketplaces. These companies have made it to the TOP startup and product company rankings in Ukraine, secured top positions in the App Store, and developed platforms used by millions. Our businesses have been featured in renowned media outlets like TechCrunch and Wired.We take pride in our robust team of over 1,000 specialists, equipped with exceptional expertise and ambitious goals. Our people are our greatest asset, which is why we strive to build businesses with the best talents available.We are currently seeking an Analytics Team Lead for one of our portfolio companies.This team has successfully validated its business model, identified unit economics, achieved breakeven, and is actively scaling. Every new hire has the opportunity to become a leader in their field—success depends solely on your ambitions.Key Challenges:— Analytics Vision & Strategy: Develop a comprehensive analytics strategy that integrates marketing, product, and operations into a unified data ecosystem;— Team Management: Build and nurture a cross-functional team of analysts, providing mentorship and implementing high data standards;— Cross-functional Insights:Marketing: Evaluate media buying effectiveness (LTV/CAC, Attribution, Incrementality);Product: Analyze user behavior (Retention, A/B testing, conversion funnels);Operations: Optimize internal processes (payments, support, trust & safety);— Data Architecture: Collaborate with engineers to enhance the Data Warehouse and ensure data cleanliness and accessibility for all stakeholders;— Business Partnership: Direct collaboration with founders and C-level executives to forecast growth and validate business hypotheses.

Join our dynamic Data Team at Wix as a DevOps Engineer, where you will play a pivotal role in optimizing our infrastructure and enhancing our data processing capabilities. You will collaborate with cross-functional teams to improve deployment automation, maintain system reliability, and ensure the scalability of our services.

Join our dynamic team as a Senior Data Engineer in the AdTech unit, where you will drive innovation and enhance data-driven decision-making processes. You will work collaboratively with cross-functional teams to develop robust data pipelines and optimize data architectures.

Join United Tech as a Creative Marketing Team Lead, where you will spearhead our creative strategy for paid traffic performance. This is a unique opportunity to directly influence the success of high-growth products within a competitive landscape (US, UK, CA, AU markets), where every idea and decision counts. You will craft and implement innovative marketing strategies, oversee the entire production process from concept to final deliverables, and build a dynamic creative team from the ground up. Enjoy the autonomy to initiate bold projects, make independent decisions, and impact essential business outcomes in a fast-paced, bureaucracy-free environment.About Our Product: At United Tech, we are pioneers in the rapidly evolving social networking sector, revolutionizing online connections through a live-streaming platform that is growing at an annual rate of over 21%. We design products that integrate streaming, video content, interactivity, and community engagement, targeting a global audience. Our flagship offering is an international streaming platform devoid of advertisements, allowing users to connect in real-time via video chats and live broadcasts. Beyond this, we are developing additional innovative products within the niche, each catering to distinct mechanics, audiences, and monetization strategies. Our team is dedicated to tackling complex analytics, AI solutions, personalization, and the scaling of high-load systems. If you're passionate about shaping the future of social networking, we want you on our team!

SKELAR is a Ukrainian venture builder focused on creating international tech businesses. Together with our co-founders, we assemble strong teams to succeed in global markets.Currently, SKELAR operates several businesses across various niches—from EdTech to marketplaces. Our companies rank among the top startups and product companies in Ukraine, achieving high positions in the App Store and developing platforms that millions of people use. Furthermore, our businesses have been featured in esteemed media outlets such as TechCrunch and Wired.We are seeking a HelpDesk Team Lead to join our team at SKELAR. This is a unique opportunity to influence processes, develop your team, and work with cutting-edge technologies. SKELAR is not just a company; it's an ecosystem building ambitious international IT businesses. We value strategic thinkers who take responsibility and constantly strive for excellence.In this role, you will manage a team of 3 engineers, optimize technical support processes, improve office infrastructure, and implement innovations. We have no bureaucracy, and your ideas can transform processes across the organization. If you are eager to grow, possess technical expertise, and want to influence large projects, this is your chance to join a high-performing team and help us achieve ambitious goals.

TENTENS Tech is looking for a Backend Team Lead to support its MarTech initiatives in Kyiv. This leadership position centers on guiding backend development and helping the team achieve higher performance. What you will do Lead and mentor backend engineers working on MarTech projects Guide technical decisions and support the team’s growth Promote high standards and help the team reach new levels of performance About TENTENS Tech TENTENS Tech partners with SKELAR, a Ukrainian venture builder focused on building international tech businesses. The company’s main products are social discovery platforms used by more than 20 million people worldwide. The team includes over 250 members who are encouraged to take ownership and show initiative. TENTENS Tech values focus, thoughtful questions, and a drive to exceed expectations. Ambition and a commitment to excellence are at the core of the company culture.

Join Ajax Systems, a leading international technology company and Europe's largest manufacturer of security systems, as we seek a talented Senior Mechanical Engineer. With over 4.5 million end users and 330,000 PRO users across more than 180 countries, our solutions provide robust protection for residential and commercial properties of all sizes. Our diverse portfolio includes 280 devices focused on intrusion prevention, video surveillance, fire safety, and automation. We are experiencing rapid growth both in our team size and our global user base. As part of our R&D division, which encompasses four departments—System, Device, Automation, and QA—you will play a crucial role in the Device Department. This team focuses on innovating security and automation devices while overcoming significant challenges, including: - Low-Power: Ensuring devices operate for extended periods on standard batteries. - Cost Efficiency: Maintaining competitive pricing for mass-market products. - DFM (Design for Manufacturing) and DFH (Design for Humans): Creating designs that are easily replicable in high volumes without sacrificing quality. Our development primarily utilizes STM32 microcontrollers, along with other MCUs and SoCs, employing Embedded C programming. We have cultivated a strong team of skilled Hardware and Embedded C engineers, industrial designers, and mechanical design engineers. We are now seeking an experienced engineer who is eager to advance their career as a Mechanical Engineer.

Join our dynamic team at Miratech as a Senior Network Data Analyst, where you will leverage your expertise to analyze and optimize network performance. Your analytical skills will directly contribute to enhancing our engineering efforts, ensuring our data infrastructure remains robust and efficient.This role is perfect for someone passionate about data analytics and networking, looking for part-time opportunities to make significant impacts in a growing company.

Join SKELAR, a pioneering venture builder committed to establishing international tech businesses. We partner with co-founders to assemble strong teams that excel in global markets.Currently, SKELAR manages a diverse portfolio of businesses across various sectors, from EdTech to marketplaces. Our ventures have been recognized as top startups and product companies in Ukraine, featuring prominently in AppStore rankings and creating platforms used by millions. Notable media outlets like TechCrunch and Wired have covered our businesses.We take pride in our robust team of over 1,000 specialists, each possessing exceptional expertise and ambitious goals. Our people are our greatest asset, and we strive to build businesses alongside the best talent available.We are currently seeking a Golang Backend Team Lead for PawChamp, a mobile application and online platform designed for dog owners. PawChamp enables pet parents to train their dogs and learn more about care and training through 24/7 chats with experts, the AI companion Pawchie, and educational materials developed in collaboration with dog trainers. Our aim is to provide personalized daily lessons covering all aspects of dog training, from basic commands to addressing behavioral issues. Our strategic goal is to become the leading player in the global online dog training market, fulfilling all needs of pet parents and their dogs beyond training.In October 2025, we earned the title of Product of the Day on Product Hunt.App Store rating: 4.8Intro video about the product: https://www.youtube.com/watch?v=D3vURwhmufgKey Challenges:Enhancing the backend for our mobile products and the PawChamp web platform.Leading, coordinating, and developing the backend development team.Collaborating with stakeholders.Ensuring high code quality and adherence to best development practices within the team.Interacting with adjacent teams to improve system component interaction and optimize processes.Enhancing code, architecture, services, and development approaches.What We Value:

Storyby, a part of skelar, seeks a Senior Data Analyst in Kyiv. This role centers on applying analytical expertise to guide business strategy and inform key decisions across the organization. What you will do Work with large datasets to identify trends and patterns relevant to the business Produce insights that drive company objectives and support growth Communicate findings clearly to stakeholders from different teams Support product development and improve operational efficiency through thorough data analysis Impact Analysis and recommendations in this role will directly shape Storyby's product direction and contribute to ongoing improvements in how the company operates.

TENTENS Tech, a partner IT company of SKELAR, is at the forefront of building international tech businesses from Ukraine.We create innovative social discovery platforms that serve over 20 million users globally. Our impressive pace and scale are fueled by deep expertise in analytics, high-load systems, and performance marketing.Our team at TENTENS Tech consists of over 250 professionals, each acting as a CEO in their role and contributing to our collective success. We operate with a 10/10ths mentality: we keep our sights on our goals, ask the right questions along the way, and never settle for 'good enough' — we strive for excellence and beyond. If you resonate with this mindset and are ready to accelerate with us, we want to meet you!We are currently seeking a Backend Team Lead to help elevate our standards of excellence.

TENTENS Tech is a strategic partner of SKELAR, a Ukrainian venture builder dedicated to developing international tech businesses.We create social discovery platforms for over 20 million users globally. Our pace and scale are supported by deep expertise in analytics, high-load systems, and performance marketing.Today, the TENTENS Tech team consists of more than 250 professionals, each acting like a CEO in their role and contributing to our collective success. We operate with a 10/10ths mindset: aiming for excellence, asking the right questions along the way, and never settling for 'good enough'—we strive for maximum impact and beyond. If this resonates with you and you’re ready to accelerate with us—let’s connect!We are currently seeking a Backend Team Lead to help elevate our results.

Role overview N-iX is seeking a Mid-Level Big Data Engineer located in Ukraine. This role centers on building and maintaining data pipelines, Ontology Objects, and Foundry Functions within the Palantir Foundry platform. Collaboration with colleagues from various teams is a key part of the position, with the goal of delivering data solutions that inform decision-making throughout the company. What you will do Design, develop, and maintain advanced data pipelines Work with Ontology Objects and Foundry Functions in Palantir Foundry Collaborate with stakeholders from different teams to deliver scalable, reliable, and secure data solutions Requirements Experience working with cloud-based data engineering Understanding of modern data architectures Interest in tackling complex data challenges, particularly in regulated and data-heavy environments