Senior Fullstack AI Developer (f/m/x)

🏢 Summary: Mid/Senior UI/UX Designer role focused on designing and optimizing digital travel e-commerce products from research and concept (lo-fi) to high-fidelity interfaces and implementation. The position involves close collaboration with product and development teams, conducting user research, and improving user experience through testing and analytics. The role includes active use of AI tools to support the design process and product iteration. 🗂️ Requirements: Minimum 2 years of experience in UI design for e-commerce or travel products, Knowledge of Human Interface Guidelines, Knowledge of Material Design, Experience in user research and usability testing, Experience with A/B testing and analytical tools, Ability to create user flows, wireframes and high-fidelity UI designs, Experience collaborating with developers and product teams, Very good command of English 📃 Skills: UI, UX, Figma, A/B, Analytics, Usability, Wireframing, Prototyping, AI, HIG, MaterialDesign, English 🏢 Description: Pasja do podróżowania to coś, co łączy całą Grupę eSky (eSky, eDestinos, Thomas Cook). Nasze internetowe biuro podróży powstało z połączenia wieloletniego doświadczenia w branży turystycznej z zamiłowaniem do nowoczesnych technologii. Tworzymy rozwiązania, które inspirują ludzi do poznawania świata i wspólnie zamieniamy te inspiracje w doświadczenia. Szukamy doświadczonej osoby na stanowisko UI/UX Designera , która wesprze nas w tworzeniu i rozwijaniu produktów cyfrowych od pierwszych koncepcji, przez projektowanie interfejsów, aż po wdrożenie. Jeśli chcesz mieć realny wpływ na kształt jednego z najpopularniejszych produktów turystycznych, tworzonego przez lidera branży w Europie Środkowo-Wschodniej i kluczowego gracza na rynkach Ameryki Południowej, cenisz pracę zespołową, ale potrafisz też działać samodzielnie to może być miejsce dla Ciebie. 📍 Zdalnie z Polski lub model hybrydowy (Katowice, Green Park) 🏅 Mid/Senior Jak będzie wyglądała Twoja podróż z nami? Udział w tworzeniu i rozwijaniu produktów cyfrowych eSky od opcjonalnych badań i analizy informacji, przez opracowywanie rekomendacji, tworzenie koncepcji (lo-fi), finalnego wyglądu produktu (hi-fi), aż po przekazanie projektów do wdrożenia. Dbanie o organizację procesu projektowego oraz dokumentację projektową. Praca samodzielna oraz zespołowa w tym udział w regularnych spotkaniach zespołu i mniejszych grup projektowych. Ścisła współpraca z projektantami, właścicielami biznesowymi, product ownerami, interesariuszami oraz zespołami deweloperskimi przy tworzeniu koncepcji user flow, makiet oraz projektów interfejsu. Aktywne uczestniczenie w rytuałach zespołów produktowych i zespołu UX/UI. Badanie zachowań użytkowników i optymalizacja rozwiązań z wykorzystaniem testów A/B, narzędzi analitycznych i testów użyteczności. Wsparcie merytoryczne dla mniej doświadczonych członków zespołu poprzez konsultacje oraz dzielenie się wiedzą. Aktywne wykorzystanie narzędzi AI jako wsparcia w codziennym procesie projektowym od generowania koncepcji i przyspieszania pracy warsztatowej, po analizę danych i iterację nad rozwiązaniami. Żeby spełnić się w tej roli, potrzebujesz: Minimum 2-letniego doświadczenia w projektowaniu interfejsów dla produktów e-commerce , travel lub podobnych środowisk produktowych. Znać podstawy Human Interface Guidelines oraz Material Design . Umiejętności analizowania potrzeb użytkowników oraz procesów wewnątrz organizacji w celu projektowania jak najlepszych doświadczeń. Umieć spojrzeć szerzej niż tylko na sam interfejs rozumieć kontekst biznesowy oraz wpływ projektowanych rozwiązań na inne obszary produktu. Otwartości na konstruktywną krytykę oraz umiejętności uzasadniania swoich decyzji projektowych na podstawie konkretnych argumentów Bardzo dobrze posługiwać się językiem angielskim . Mile widziane: (praca nad rozwojem produktów cyfrowych typu CRM, doświadczenie w branży holiday lub travel) Co możemy zaoferować, jeśli zdecydujesz się na podróż z nami? Pracę w modelu hybrydowym z Katowic (Green Park). Czas na naukę możesz poświęcić nawet dwie godziny ze swojego tygodnia pracy, na rozwój kompetencji. Dofinansowanie do lekcji języka angielskiego w godzinach pracy. Prywatną opiekę medyczną w Luxmed. Employee Assistance Program - dzięki niemu możesz skorzystać z darmowych porad prawnych, psychologicznych lub finansowych. Bezpłatny parking. Możliwość przystąpienia do grupowego ubezpieczenia na życie, dzięki współpracy z firmą Warta. Proces rekrutacji: Aplikacja : Wyślij nam swoje CV wraz z linkiem do Portfolio Rozmowa telefoniczna z członkiem naszego zespołu rekrutacyjnego ( ok. 20 minut ). Rozmowa online z członkami zespołu oraz TL . Prezentacja przykładowego projektu pokazująca proces projektowy. Na spotkaniu możesz spodziewać się także zadania - white board challenge ( ok. 1,5h ). Rozmowa z Dyrektorem departamentu Software Product Development i TL UX/UI ( ok. 40 minut ) Informacja zwrotna: Otrzymasz od nas feedback niezależnie od wyniku rekrutacji.

🏢 Summary: Leadership role for a Team Lead (C# + Angular) responsible for developing and optimizing an internal Operations Panel system supporting high-volume reservation handling. The position combines hands-on .NET development with team management and business-driven process improvements in a cloud-based environment. The role focuses on technical excellence, operational metrics, and close collaboration with business stakeholders. 🗂️ Requirements: Minimum 2 years of experience managing a team of at least 3 developers, Very good knowledge of .NET and C#, Proficiency in using AI tools supporting software development, Experience in active software development and solving complex technical issues, Ability to translate business goals into technical initiatives, Experience with code review, architecture, and maintaining code quality 📃 Skills: C#, .NET, Angular, Kubernetes, GCP, AI, TDD, CI 🏢 Description: Pasja do podróżowania to coś, co łączy całą Grupę eSky (eSky, eDestinos, Thomas Cook – najstarsza marka turystyczna na świecie) . Nasze internetowe biuro podróży powstało z połączenia wieloletniego doświadczenia w branży turystycznej z zamiłowaniem do nowoczesnych technologii. Tworzymy rozwiązania, które inspirują ludzi do poznawania świata i wspólnie zamieniamy te inspiracje w doświadczenia. Szukamy Team Lead'a (C# + Angular) , który/-a dołączy do zespołu odpowiedzialnego za Operations Panel – wewnętrzny system, który wspiera pracę kilkuset agentów obsługujących rezerwacje klientów i obsługuje tysiące zgłoszeń każdego dnia . Będziesz miał/-a realny wpływ na usprawnienie procesów operacyjnych – współpraca z działem Operations, analiza danych i proponowanie zmian w procesach to stała część tej pracy. To rola z odpowiedzialnością za wynik biznesowy i rozwój zespołu. Stawiamy na ciągłe doskonalenie – zespołu, procesów i produktu. Liczy się dla nas orientacja na rezultat biznesowy i umiejętność wzięcia pełnej odpowiedzialności za powierzone inicjatywy Zespół: 3 developerów + Product Owner Stack technologiczny: .NET (C#) , Angular , Kubernetes, Google Cloud Platform, AI coding tools . 📄 UoP (20 300 - 24 170 PLN brutto ) | B2B (160 - 190 PLN netto na godzinę) 📍 Katowice (model hybrydowy, częstotliwość do ustalenia) Na co dzień będziesz: Współpracować z Product Ownerem (w zespole) i Operations przy definiowaniu celów i priorytetów (AHT, throughput, SLA/SLO, jakość). Przekładać cele biznesowe na inicjatywy techniczne. Aktywnie programować – wsparcie zespół w rozwiązywaniu złożonych zagadnień. Dbać o standardy techniczne: code review, architektura, jakość, dług techniczny Analizować dane operacyjne i inicjować usprawnienia (nie tylko w aplikacji) Wspierać zespół:  feedback, 1:1, coaching, hiring Współpracować z zespołami rozliczeń, płatności i postsale (zależności, flow end-to-end). Oczekujemy: Min. 2 lata doświadczenia w zarządzaniu przynajmniej  3  osobowego zespołu. Bardzo dobrej znajomości  .NET/C#. Biegłości w korzystaniu z dowolnego narzędzia AI wspierającego pracę dev. Orientacji na rezultaty biznesowe oraz umiejętności definiowania sukcesu – jasne określenie celów i sposobu ich pomiaru poprzez kluczowe metryki. Kultury konstruktywnego feedbacku. Proaktywności w inicjowaniu zmian. Nice-to-have Doświadczenie w pracy z metrykami operacyjnymi (AHT, throughput, SLA/SLO, czas rozwiązania lub podobne). Doświadczenie w optymalizacji procesów przez software (kolejkowanie, ticketing, routing, rule engine, automatyzacja decyzji). Angular/frontend. Kubernetes, GCP. Doświadczenie w travel / operations. Bliska współpraca z zespołami operations. U nas znajdziesz: Bezpośredni wpływ na kształt krytycznego systemu obsługującego tysiące ticketów dziennie oraz bliską współpracę z biznesem. Pełną autonomię, samoorganizujące się zespoły, swoboda tworzenia metody pracy i wyboru technologii. Dojrzałe procesy Agile i technologiczne Test Driven Development, Continuous Integration, codzienne wdrożenia pozwalające na obserwowanie efektów pracy. Narzędzia AI (Cursor, Claude, Copilot, Augment). Sprzęt do wyboru (Mac/Windows). Co możemy zaoferować? Pracę w modelu hybrydowym z Katowic (większość Liderów przyjeżdża do biura regularnie). Szkolenia wewnętrzne i zewnętrzne (np. z Machine Learning, Kubernetes) i Hackathony. Udział w konferencjach IT co roku jesteśmy obecni na najważniejszych branżowych konferencjach, nie tylko w Polsce, ale i za granicą ( m.in . Infoshare, Google Cloud Next, ngPoland, jsPoland, 4Developers). Czas na naukę. Możesz poświęcić dzień na każde dwa tygodnie na własny rozwój. Wewnętrzne i zewnętrzne szkolenia dla liderów w ramach eSky Leadership Academy. Dofinansowanie do lekcji języka angielskiego w godzinach pracy. Prywatną opiekę medyczną w Luxmed. Employee Assistance Program - dzięki niemu możesz skorzystać z darmowych porad prawnych, psychologicznych lub finansowych. Bezpłatny parking. Możliwość przystąpienia do grupowego ubezpieczenia na życie, dzięki współpracy z firmą Warta. Firmowe eventy: spotkania integracyjne, okazje do dzielenia się i zdobywania wiedzy.

🏢 Summary: Full-Stack Senior Software Engineer role focused on building user-facing web applications and conversational interfaces for AI-driven logistics systems. The position involves designing intuitive human–AI interaction flows and integrating frontend applications with backend services and agent-based AI systems. It combines strong frontend development with backend integration to deliver scalable, high-quality end-to-end solutions. 🗂️ Requirements: Strong full-stack software engineering experience, Proficiency in JavaScript and TypeScript, Experience with React or similar frontend frameworks, Solid understanding of backend systems and APIs, Experience integrating frontend with backend services and APIs, Experience building user-facing applications with focus on usability and performance, Understanding of UX principles and interaction design, Experience working with asynchronous workflows and real-world data, Familiarity with AI-powered applications or conversational interfaces, Experience with cloud platforms (AWS, GCP, or Azure), Strong debugging skills across frontend and backend 📃 Skills: JavaScript, TypeScript, React, Next.js, APIs, REST, UX, LLM, AWS, GCP, Azure, HTML, CSS 🏢 Description: What's the role? We are looking for a strong Full-Stack Senior Software Engineer to build intuitive, high-quality user experiences for next-generation agentic AI solutions in the logistics domain. The systems developed by this team optimize deliveries at scale improving driver efficiency, increasing reliability, reducing operational costs, and lowering environmental impact. In this role, you will develop user-facing web applications and conversational interfaces that enable users to interact seamlessly with AI-powered systems. You will focus on creating clear, efficient, and reliable human–AI interaction flows, while integrating tightly with backend services, agent systems, and APIs. This is a hands-on role that requires both strong frontend expertise and solid backend understanding , along with a sharp sense of product and user experience. What You’ll Do: Design and build user-facing web applications and conversational interfaces for AI-driven logistics workflows Develop intuitive human AI interaction flows that make complex system behavior understandable and usable Implement frontend applications using modern frameworks (e.g., React, Next.js) with a strong focus on performance and usability Integrate UI layers with backend services, agent systems, and APIs to deliver end-to-end functionality Collaborate with backend engineers and AI engineers to ensure smooth data flow and system interactions Translate product requirements and user needs into clean, usable, and scalable UI solutions Contribute to backend components where needed (e.g., API integration, lightweight services, orchestration logic) Ensure high-quality delivery through testing, monitoring, and continuous iteration based on user feedback Improve overall user experience through better workflows, interaction patterns, and system responsiveness Leverage AI-assisted development tools to improve development speed and code quality Who are you? What We’re Looking For: Software engineering experience with strong full-stack development skills Strong proficiency in frontend technologies (JavaScript/TypeScript, React or similar frameworks) Solid understanding of backend systems, APIs, and service integration patterns Experience building user-facing applications with a focus on usability, performance, and maintainability Good understanding of UX principles and ability to design flows that simplify complex systems Experience integrating with APIs and working with real-world data and asynchronous workflows Familiarity with AI-powered applications (e.g., conversational interfaces, LLM integrations, agent-driven systems) is a strong plus Experience with cloud platforms (AWS, GCP, or Azure) and modern development practices Strong debugging and problem-solving skills across frontend and backend layers Ability to work independently on well-defined problems and collaborate effectively in cross-functional teams Good communication skills and a strong sense of ownership What We Offer: The opportunity to tackle meaningful and challenging problems A chance to continuously learn and stay on top of the latest technology trends Work that has real-world impact, shaping the future of mobility and technology Regular feedback to help you grow and succeed in your role A collaborative and supportive team environment where your contributions are valued Competitive salary plus bonus Flexible working hours and a hybrid working environment Medical coverage for you and your family This role is eligible for Creative Tax Incentive scheme in Poland” or KUP (Autorskie Koszty Uzyskania Przychodu) Option to work on a B2B contract (please note: benefits, bonus and KUP do not apply in this case) Change is HERE. Apply Now! #LI-AK8   #LI-HYBRID Life at HERE in Poland comes with a competitive total rewards package designed to support your health, wellbeing, and performance. This includes a base salary, a Short-Term Incentive (STI) bonus (percentage based on role), a creative tax advantage for eligible positions, private medical care (including dental), life insurance, a meal allowance, vision reimbursement, a remote work allowance (if applicable), access to MyBenefit and Multisport programs, and various wellbeing initiatives. Paid time off, sick leave, and parental leave are provided in accordance with the Polish Labor Code. As part of HERE Technologies employment process, candidates will be required to successfully complete a pre-employment screening process. This offer and any related claims are subject to the successful completion of a pre-employment screening. This will involve employment, education, and criminal verification if applicable. HERE is an equal opportunity employer. We evaluate qualified applicants without regard to race, color, age, gender identity, sexual orientation, marital status, parental status, religion, sex, national origin, disability, veteran status, and other legally protected characteristics. Who are we? HERE Technologies is a location data and technology platform company. We empower our customers to achieve better outcomes – from helping a city manage its infrastructure or a business optimize its assets to guiding drivers to their destination safely. At HERE we take it upon ourselves to be the change we wish to see. We create solutions that fuel innovation, provide opportunity and foster inclusion to improve people’s lives. If you are inspired by an open world and driven to create positive change, join us. Learn more about us on our YouTube Channel. Apply for this job online Email this job to a friend Share on your newsfeed Connect With Us! Not ready to apply? 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🏢 Summary: This role offers junior engineers the opportunity to build and deliver real product features in an AI-native engineering environment, using AI agents to accelerate development from idea to production. You will work across backend, frontend, mobile, and infrastructure layers in small autonomous teams, focusing on impactful, user-centered solutions. The position emphasizes hands-on development, technical growth, and collaboration on improving AI-driven workflows. 🗂️ Requirements: Minimum 1 year of software development experience, Experience building a real product, system, tool, or feature, Ability to work across backend, frontend, or mobile layers, Ability to collaborate with product, design, and engineering teams, Ability to learn and apply new technologies quickly, Interest in AI and AI-assisted development tools 📃 Skills: Go, MySQL, Kafka, Docker, Kubernetes, AWS, Redis, Next.js, React, TypeScript, GraphQL, Tailwind, Cloudflare, SwiftUI, Xcode, Combine, SPM, MVVM, Kotlin, Android, Hilt, Coroutines, Jetpack, Linux, GitLab, ArgoCD, Terraform, Helm, OpenSearch, Prometheus, Python, Golang, Claude, OpenAI, Codex, Cursor 🏢 Description: At Saily, we’re removing the hassle of staying connected while traveling — no roaming fees, no plastic SIM cards, just lightning-fast, secure mobile data in 200+ destinations. Saily has millions of paying customers and hundreds of thousands travelers browsing through Saily at any given moment. To build the best product for our customers we foster AI-native Product Engineering culture , where: - The Engineer is the builder, who is responsible for solving customer problems end-to-end (idea to production) - AI Agents are the enablers who write most of the code and solve repeatable  tasks to  help the Engineers  maximize their impact - Everyone contributes to making Saily effective by suggesting new areas for improvement to delegate to agents and then implementing the changes - Curiosity, learning and sharing are everyone's responsibility - Customer, having a comfortable, connected, hassle-free journey is never lost from the focus We value growth over comfort, contribution over hierarchy, and impact over process. At Saily, we believe in giving sharp people context, autonomy, and AI as their multiplier to allow them to just do their best work. We’re opening our doors to talented junior engineers - because impact isn’t measured in years of experience. It comes from your drive to learn, your discipline, and a sharp mind. It’s about building and shaping what’s around you - and Saily will give you the room to do exactly that. What can you expect from us? Hands-on experience with AI-assisted software development, shared openly. Full freedom to use whatever learning resources you need to keep up. A product that’s successful, impactful, and technically challenging - something you’ll actually want to build. Pack your skills, bring your vision, and join Saily ! Main Responsibilities Delivers small tools/features with support from the team. Collaborate with product, design, and other engineers. Operate in small, highly autonomous teams. Learn how to use AI agents for specs, coding, analysis, testing, and iteration. Take part in the improvements of our internal agent network and development workflows. Focus on user and business outcomes, not output. Core requirements 1+ year of software development experience building something real (product, system, tool, startup, side project, meaningful feature, or student project) You value autonomy over stability and process You enjoy working across layers instead of staying in one box You think in problems and outcomes, not tickets You are comfortable with ambiguity You can learn new technologies quickly You are curious about AI and excited to work with agents Tools You Will Use Backend: Go, MySQL, Kafka, Docker, Kubernetes, AWS, Redis Frontend: Next.js, React.js , TypeScript, GraphQL, Tailwind CSS, Cloudflare Workers IOS: SwiftUI, Xcode, Combine, SPM, MVVM Architecture Android: Kotlin, Android Studio, Hilt, Coroutines, Jetpack Compose, MVVM Architecture Infra: Linux, Docker, GitLab, ArgoCD, AWS, Terraform, Helm, OpenSearch, Prometheus, Python / Golang AI tools: Claude Code, OpenAI Codex, OpenCode, Cursor with Composer Salary Range Gross salary:  18,100 — 24,400 PLN / month What We Offer Innovate with industry leaders Work alongside global experts to build world-leading cybersecurity tools, impacting millions of users around the world. Learn & grow Boost your skills via our extensive training programs (online and offline) & other resources. Benefit from mentorship and career-switch opportunities to grow within the company. Hybrid work Enjoy the flexibility with 3 office days and working from home for the remaining 2. Work from anywhere Recharge with a change of scenery – choose work from any location when you feel a need to power your creativity and drive. Physical well-being Fuel your active lifestyle with online workouts led by our Physical Well-Being experts. Unlock a variety of sports and wellness facilities, like gyms, swimming pools, and fitness classes, with the Multisport card. Mental & emotional health Nurture your mind with free psychologist consultations, dedicated mental health events, and premium access to top-rated wellness apps like Calm, Headspace, and Mindletic. Premium healthcare Receive private health insurance giving you peace of mind for your health needs. Joyful moments – special treats Celebrate life’s big moments with special gifts from us on your birthday, anniversary, and other major events, such as weddings or the arrival of a new family member. Company events & team-building Experience iconic Nord Security celebrations, team-buildings, and knowledge-sharing events, nurturing bonds that fuel our success. Workation Embark on a legendary company getaway abroad, filled with exciting activities, live concerts, engaging workshops, and epic time together.

🏢 Summary: Senior Full Stack Engineer role focused on building and owning end-to-end product features for an AI-driven platform that automates complex business processes. The position involves developing frontend and backend solutions, designing APIs, improving performance and usability, and leveraging AI tools in daily engineering work. The role is office-based in Warsaw and requires strong product thinking and production-level experience. 🗂️ Requirements: Senior-level experience building production web applications, Strong knowledge of React and TypeScript or similar frontend framework, Experience designing and developing backend APIs and application logic, Ability to build and maintain frontend and backend features end-to-end, Experience working with production environments and monitoring released features, Daily use of AI tools for development and problem-solving, Strong understanding of code quality, testing, and long-term ownership 📃 Skills: React, TypeScript, JavaScript, API, REST, Node.js, Python, GitHub, Copilot, Claude, OpenAI, Codex, TypingMind, MCP, AI 🏢 Description: About Us Many companies want to use AI agents, but these agents often have problems with complex business tasks. We help solve this issue. Our platform understands company rules, processes, and workflows, so AI can make better decisions instead of only giving simple answers. This allows businesses to use AI that is accurate, follows company policies, and can be trusted. Well-known companies use our technology to automate up to 85% of customer cases, reduce handling time by 20–25%, and complete tasks that used to take hours in just a few seconds. We work with leading technology partners and have received industry recognition for our innovative approach. Our mission is to give people better answers everywhere. About the Role We are looking for a Senior Full Stack Engineer with strong product thinking. In this role, you will own features from start to finish. You will understand user needs, plan solutions, build frontend and backend functionality, release new features, and improve them based on user feedback. You should feel comfortable working on user interfaces, APIs, and production quality while collaborating with product and design teams. Location: Warsaw (office-based). Responsibilities Build and deliver product features across both frontend and backend. Turn product ideas into practical and effective solutions. Work with user interfaces, business logic, APIs, and data flows. Cooperate closely with product managers and designers, even when requirements are still developing. Improve usability, performance, reliability, and overall user experience. Monitor released features and use production data to make improvements. Use AI tools every day to work faster and improve engineering processes. Maintain high standards for code quality, testing, and long-term ownership. Requirements Strong experience as a senior engineer building production web applications. Good knowledge of React, TypeScript, or a similar modern frontend framework. Experience designing and developing backend APIs and application logic. Strong product mindset with the ability to identify and improve weak user experiences. Good decision-making skills when balancing scope, speed, and technical quality. Clear communication and teamwork across engineering, product, and design. Daily experience using AI tools for development and problem-solving. Nice to Have Experience building AI-powered products such as chat, search, recommendation systems, workflows, or AI agents. Knowledge of Python, Node.js, or both. Experience owning product areas independently. Understanding of performance optimization, accessibility, and high-quality web applications. What We Offer B2B contract and company stock options. MacBook Pro for work. Modern technology stack with opportunities to contribute to open-source projects. Advanced AI development tools, including GitHub Copilot, Claude Code, OpenAI Codex, TypingMind, and MCP Servers. Why Join Us Our leadership team has strong experience in knowledge management and AI. We have raised more than $60 million in funding and achieved three years of continuous 3x growth. Our work is guided by these core values: Quality: We aim for excellent craftsmanship and high standards in everything we build. Momentum: We take initiative and keep projects moving forward. Accountability: We take responsibility, give honest feedback, and support each other. Hard Work: We believe difficult goals require dedication and teamwork. Learning Agility: We stay curious, learn from mistakes, and keep improving. Adapt and Thrive: We accept change and see challenges as opportunities. Win Together: We succeed as a team through honesty, openness, and shared commitment.

🏢 Summary: Senior Full-Stack Engineer role focused on designing and scaling AI-driven systems powered by LLMs for a virtual agent platform. The position involves building backend services, integrating external APIs, and owning architecture decisions for distributed, high-performance applications. You will contribute directly to LLM-based features, optimize system performance, and support real-time decision-making systems. 🗂️ Requirements: 5+ years of software engineering experience, Experience building production systems, Experience designing scalable distributed applications, Hands-on experience developing or integrating LLM-based products, Experience with RAG pipelines, custom agents, fine-tuning or orchestration frameworks, Strong Python experience, Solid understanding of Linux environments, Experience integrating multiple APIs, Ability to identify and resolve performance bottlenecks 📃 Skills: Python, LLM, RAG, LangChain, LlamaIndex, Linux, APIs, DistributedSystems, Microservices, Performance 🏢 Description: You’ll join as a Senior Full-Stack Engineer with hands-on experience building products powered by LLMs, contributing directly to the development of our AgentSee AI platform. RESPONSIBILITIES Design, build, and scale AI-driven systems that power our virtual agent capabilities (conversational reasoning, retrieval, and automation flows) Develop backend services and data pipelines that integrate multiple APIs (Amadeus, Sabre, internal systems) to support real-time decision-making Collaborate with other teams to ship LLM-based features that deliver measurable impact Own architecture decisions for distributed, high-performance AI applications Continuously improve model performance, reliability, and monitoring frameworks Help define our engineering best practices, guide technical decisions, and mentor other developers within the team REQUIREMENTS 5+ years of experience in software engineering, with a track record of building production systems Strong background in designing scalable, distributed applications 2 Proven hands-on experience developing or integrating products using LLMs (e.g., RAG pipelines, custom agents, fine-tuning, or orchestration frameworks like LangChain/LlamaIndex) Hands-on experience with Python Solid understanding of Linux runtime environments Skilled at identifying and solving performance bottlenecks Excellent collaboration skills with the ability to give and receive constructive feedback Fluent in English, with strong written and verbal communication Proactive, curious, and eager to keep learning NICE TO HAVE Experience with the travel industry (especially GDS APIs like Sabre, Amadeus, or Travelport) Hands-on with Kubernetes, AWS, Terraform, and CI/CD practices Contributions to open-source projects or notable side projects Familiarity with agile methodologies and collaborative product development WHAT DO WE OFFER ON THIS PROJECT? Employment directly through the client. Cooperation based on a B2B. 100% remote work. WHAT DOES THE RECRUITMENT PROCESS LOOK LIKE? Application: Apply and submit your CV. After the application review, the recruiter will contact selected candidates by phone. Screening: Have a conversation with a speedapp recruiter about your experience. Next steps: The speedapp recruiter will explain the recruitment process for the specific position. The speedapp recruiter will stay in touch with you throughout the entire process. ABOUT SPEEDAPP At speedapp, we believe that an organization is only as good as the people who make it up. We are a team of IT experts and other professionals working for our clients around the world (including Israel, Austria, USA). We go far beyond the HR category. We build IT teams and also help manage them. 👉 10 years of experience 👉 +100 clients worldwide +300 hires per year 💎 We have won the prestigious "Forbes Diamonds" award four times (2022, 2023, 2024, 2025). We are a member of the European Fast Growth Icons network and FinTech Poland. We are ranked 18th among the 100 fastest growing companies 2023 by Clutch. DO YOU HAVE ANY QUESTIONS? Contact the recruiter responsible for this process directly. Barbara KrawczykJunior IT Delivery Consultantbarbara.krawczyk@speedapp.pl+48 734 469 838

🏢 Summary: Senior Full-Stack Engineer role focused on designing and scaling AI-driven systems powered by LLMs for a virtual agent platform. The position involves building distributed backend services, integrating multiple APIs, and owning architectural decisions for high-performance AI applications. You will develop and optimize LLM-based features, ensuring reliability, scalability, and measurable business impact. 🗂️ Requirements: 5+ years of software engineering experience building production systems, Experience designing scalable distributed applications, Hands-on experience with LLMs (RAG, custom agents, fine-tuning, orchestration frameworks), Strong Python programming skills, Experience building backend services and data pipelines, Experience integrating external APIs, Solid understanding of Linux environments, Experience identifying and resolving performance bottlenecks, Fluent English communication skills 📃 Skills: Python, LLM, RAG, LangChain, LlamaIndex, Linux, API, Kubernetes, AWS, Terraform, CI/CD, Amadeus, Sabre 🏢 Description: You’ll join as a Senior Full-Stack Engineer with hands-on experience building products powered by LLMs, contributing directly to the development of our AgentSee AI platform. RESPONSIBILITIES Design, build, and scale AI-driven systems that power our virtual agent capabilities (conversational reasoning, retrieval, and automation flows) Develop backend services and data pipelines that integrate multiple APIs (Amadeus, Sabre, internal systems) to support real-time decision-making Collaborate with other teams to ship LLM-based features that deliver measurable impact Own architecture decisions for distributed, high-performance AI applications Continuously improve model performance, reliability, and monitoring frameworks Help define our engineering best practices, guide technical decisions, and mentor other developers within the team REQUIREMENTS 5+ years of experience in software engineering, with a track record of building production systems Strong background in designing scalable, distributed applications 2 Proven hands-on experience developing or integrating products using LLMs (e.g., RAG pipelines, custom agents, fine-tuning, or orchestration frameworks like LangChain/LlamaIndex) Hands-on experience with Python Solid understanding of Linux runtime environments Skilled at identifying and solving performance bottlenecks Excellent collaboration skills with the ability to give and receive constructive feedback Fluent in English, with strong written and verbal communication Proactive, curious, and eager to keep learning NICE TO HAVE Experience with the travel industry (especially GDS APIs like Sabre, Amadeus, or Travelport) Hands-on with Kubernetes, AWS, Terraform, and CI/CD practices Contributions to open-source projects or notable side projects Familiarity with agile methodologies and collaborative product development WHAT DO WE OFFER ON THIS PROJECT? Employment directly through the client. Cooperation based on a B2B. 100% remote work. WHAT DOES THE RECRUITMENT PROCESS LOOK LIKE? Application: Apply and submit your CV. After the application review, the recruiter will contact selected candidates by phone. Screening: Have a conversation with a speedapp recruiter about your experience. Next steps: The speedapp recruiter will explain the recruitment process for the specific position. The speedapp recruiter will stay in touch with you throughout the entire process. ABOUT SPEEDAPP At speedapp, we believe that an organization is only as good as the people who make it up. We are a team of IT experts and other professionals working for our clients around the world (including Israel, Austria, USA). We go far beyond the HR category. We build IT teams and also help manage them. 👉 10 years of experience 👉 +100 clients worldwide +300 hires per year 💎 We have won the prestigious "Forbes Diamonds" award four times (2022, 2023, 2024, 2025). We are a member of the European Fast Growth Icons network and FinTech Poland. We are ranked 18th among the 100 fastest growing companies 2023 by Clutch. DO YOU HAVE ANY QUESTIONS? Contact the recruiter responsible for this process directly. Barbara KrawczykJunior IT Delivery Consultantbarbara.krawczyk@speedapp.pl+48 734 469 838

🏢 Summary: Senior Full Stack Developer role focused on building an enterprise AI agent management platform, with strong emphasis on backend development in Python. The position involves developing scalable web applications using Python and React, designing architecture, building REST APIs, and working on authentication and SSO integrations. The role includes collaboration on technical decisions, mentoring developers, and contributing to production-grade enterprise solutions. 🗂️ Requirements: 5+ years of commercial development experience, Strong Python knowledge, Commercial experience with React, Experience building web applications, Experience with Django, FastAPI or similar frameworks, Experience designing software architecture, Experience building scalable applications, Experience working with production systems, Practical knowledge of REST API, Knowledge of authentication and authorization, English level B2 or higher 📃 Skills: Python, React, Django, FastAPI, Celery, Docker, REST, SSO, API, Microservices 🏢 Description: O projekcie Projekt dotyczy budowy rozwiązania wspierającego organizacje enterprise we wdrażaniu i zarządzaniu agentami AI. Produkt rozwijany jest we współpracy z klientami enterprise i odpowiada na rzeczywiste potrzeby biznesowe. O roli Poszukujemy Senior Full Stack Developera, który dołączy do zespołu rozwijającego aplikację webową dla klientów enterprise. Jest to rola Full Stack z wyraźnym naciskiem na rozwój backendu w Pythonie. Będziesz rozwijać zarówno backend, jak i frontend aplikacji, uczestniczyć w projektowaniu rozwiązań oraz brać udział w decyzjach architektonicznych. Zakres obowiązków rozwój aplikacji webowej z wykorzystaniem Pythona i React, projektowanie i rozwój backendu, rozwój komponentów frontendowych w React, rozwój REST API, rozwój i utrzymanie aplikacji produkcyjnych, projektowanie skalowalnych rozwiązań dla klientów enterprise, praca nad authentication, authorization i integracjami SSO, udział w decyzjach architektonicznych oraz proponowanie rozwiązań, udział w code review i design sessions, współpraca z zespołem przy podejmowaniu decyzji technicznych, wspieranie mniej doświadczonych programistów poprzez dzielenie się wiedzą. Stack technologiczny Python React Django Celery Docker Czego oczekujemy 5 lat lub więcej doświadczenia komercyjnego, bardzo dobrej znajomości Pythona, komercyjnego doświadczenia z React, doświadczenia w tworzeniu aplikacji webowych, doświadczenia z Django, FastAPI lub podobnym frameworkiem, doświadczenia w projektowaniu architektury oprogramowania, doświadczenia w budowaniu skalowalnych aplikacji, doświadczenia w pracy z systemami produkcyjnymi, praktycznej znajomości REST API, znajomości zagadnień związanych z authentication i authorization, bardzo dobrej komunikacji, języka angielskiego na poziomie minimum B2. Dodatkowym atutem będzie doświadczenie z aplikacjami enterprise, znajomość SSO lub federated identity, doświadczenie w tworzeniu Python SDK, doświadczenie z architekturą opartą o API lub mikroserwisy. Model pracy praca w modelu hybrydowym w Krakowie, preferowane 1–3 dni w tygodniu w biurze (możliwe jest indywidualne ustalenie liczby dni). Oferujemy wynagrodzenie: 160–270 PLN/h, współpracę w oparciu o B2B, długoterminową współpracę, realny wpływ na architekturę i rozwiązania techniczne, pracę nad produktem dla klientów enterprise, pracę nad produktem wykorzystującym rozwiązania AI. Proces rekrutacyjny Rozmowa z rekruterem. Rozmowa Cultural Fit. Rozmowa techniczna. Decyzja. Proces nie obejmuje zadania domowego ani live codingu.

🏢 Summary: Opportunity for experienced Fullstack developers to join a flexible freelance network supporting modernization and feature development of a large-scale aviation platform. The role focuses on migrating legacy PHP solutions to a modern JavaScript/TypeScript stack, improving AI-assisted workflows, and enhancing search, UX, and database-driven processes. Engagements are project-based (approx. 3 months) with potential for future collaborations across modernization and MVP initiatives. 🗂️ Requirements: Hands-on full-stack development experience, Strong JavaScript knowledge, Strong TypeScript knowledge, Experience with databases and data-driven workflows, Experience migrating or modernizing legacy systems in production, Experience with AI-powered features or workflow automation, Ability to work with AWS-based environments, Direct collaboration with business stakeholders 📃 Skills: JavaScript, TypeScript, PHP, AWS, Cloudflare, SQL, AI 🏢 Description: We are building a verified network of experienced freelancers and consultants who can support our clients in flexible cooperation models: from short-term delivery acceleration and MVP initiatives to outcome-based consulting engagements. This is not a traditional recruitment process. We are looking for experienced Fullstack interested in becoming part of network and open to future collaboration opportunities adjusted to project needs, availability and specialization fit. Remuneration depends on the type of assignment. For hourly rates, our range is 150-190 PLN net + VAT. Examples of what you could do 👇 The product is is a large-scale platform used by a global community of aviation enthusiasts, going through a major modernization phase. The team is replacing legacy PHP-based solutions with a modern JavaScript/TypeScript stack while continuously delivering value to thousands of active users. Some of the challenges you might help solve: Improving the photo upload and moderation process by introducing AI-assisted mechanisms. Modernizing legacy administration and screening tools. Improving search capabilities and overall discoverability of content. Increasing the reliability and consistency of database-driven workflows. Delivering UX improvements. Supporting the migration of consent management solutions to ensure compliance across multiple markets The platform runs on AWS and Cloudflare, and the focus is on evolving the application layer, developer experience, and product capabilities rather than rebuilding the infrastructure from scratch. Estimated duration: 3 months. What other projects could you work on with us? Depending on business demand and your availability, potential engagements may include: greenfield product development, feature acceleration initiatives, modernization projects, MVP and rapid prototyping work, delivery reinforcement for existing engineering teams, consulting and outcome-based delivery projects, short-term high-impact initiatives. What would we expect? Hands-on experience with full-stack development, including JavaScript and TypeScript and database-related challenges. Experience modernizing or migrating legacy systems while keeping production environments stable. Strong communication skills and willingness to collaborate directly with business stakeholders. Experience with AI-powered product features or workflow automation. Bonus points for experience with PHP! Important! joining the network does not guarantee immediate project allocation, potential engagements may vary in duration, scope and workload, part-time, full-time and short-term cooperation models are possible. By joining the network, you may gain: access to international projects and consulting initiatives, including collaborations with Scandinavian clients, opportunities adjusted to your availability, preferred engagement model and technical strengths, long-term relationship instead of one-off transactional recruiting processes. Sounds like a fit? Let’s talk! 🚀

🏢 Summary: Senior Fullstack Engineer role focused on designing and scaling production-grade web systems, owning the full product experience from backend to frontend. The position combines product thinking with engineering, emphasizing AI-augmented features and modern fullstack architecture. You will work on complex, mission-critical applications with strong autonomy and technical ownership. 🗂️ Requirements: 5+ years of experience building complex web applications, Strong proficiency in Python or Ruby, Strong proficiency in Vue.js or React.js, Solid understanding of SQL and PostgreSQL, Experience with CI/CD pipelines, Experience with cloud environments, Experience using AI/LLM tools in development workflows, Fluent English (C1) 📃 Skills: Python, Ruby, Vue.js, React.js, PostgreSQL, SQL, AWS, Docker, CI/CD, Claude, Cursor 🏢 Description: At Upside , we’re partnering with ambitious companies across the globe to solve complex, meaningful problems through technology. We work in focused teams, combining engineering, product thinking, and design, to deliver outcomes, not just output. Open-source is a strategic part of our work. We build and maintain a number of open-source projects that support our clients and internal R&D. Our latest release is Enthusiast , a customizable agentic AI toolkit for e-commerce. What it means for you You’ll have a "Founder" mindset. You won’t just build a UI or a database - you’ll own the entire product experience. You’ll be a technical partner to stakeholders, helping them understand what’s possible with modern tech and AI. You’ll have the autonomy to experiment across the stack and the responsibility to deliver tools that actually solve business problems. You’ll work at the intersection of product thinking and engineering, deploying AI-augmented features across the entire stack. Role Overview As a Senior Fullstack Engineer, you’ll design and scale resilient systems from the ground up. You’ll bridge the gap between backend logic and frontend experience, ensuring a seamless, production-grade product. Responsibilities End-to-End Ownership: Lead the design and implementation of both backend systems and frontend interfaces. Proactive Solutions: Don't just flag blockers—come with proposals and experiments to bypass them. Consulting: Translate complex business needs into elegant, scalable fullstack architecture. Engineering Standards: Advocate for code quality, security, and performance across the entire repo. Continuous Improvement: Constantly evaluate new tech (especially AI/LLM) to improve delivery. Requirements Experience: 5+ years of building complex web applications. Backend: Strong proficiency in Python or Ruby. Frontend: Mastery of Vue.js or React.js . Infrastructure: Solid understanding of SQL (PostgreSQL), CI/CD, and cloud environments. AI-Native: You use tools like Claude or Cursor to build better and faster. English: Fluent (C1) for direct client collaboration. Tech Stack: Python, Ruby, Vue.js , React.js , PostgreSQL, AWS, Docker. Value Proposition Built for the long run We hire for the company, not just a project - looking for passion driven engineers who want to grow with Upside over time Small teams, real accountability. 3-9 people per engagement. We're small by design. That means your decisions carry weight and you are visible. Mission-critical work: We handle complex  projects that move the needle for international brands. Our clients are scaling companies, established international brands, and large institutions. The systems you build will be under real load, with real stakes. Real Ownership: You take part in the decision making process on technology and implementation..You’re empowered to take initiative, experiment, and drive solutions that create real impact. No Micromanagement: We trust you to own your work and deliver outcomes - no unnecessary oversight. Collaborative R&D: Contribute to targeted Open-source projects and internal AI research. Growth through challenges: Complex problems and direct client exposure means you’ll grow by action. Applied AI as a first-class discipline. We don't bolt AI onto projects as an afterthought. You'll identify where it genuinely moves the needle and lead the implementation - on client work and on our own open-source tooling. The tools you want. If something makes you faster or sharper, we want you using it. Transparent progression path. We have defined engineering levels with clear criteria - you'll know exactly what each role looks like, and what it takes to get from one to the other. No ambiguity, no waiting for someone above you to move on If you didn't find all the information you were looking for, have a look at our handbook - it covers a variety of different matters that could be important at this stage. If there's anything else we did not mention that you're interested in - share your thoughts with us careers@upsidelab.io Compensation & Location Salary: Senior Engineer: 20 800 - 25 900 PLN net + VAT Lead Engineer: >25 900 PLN net + VAT Location: Office in Kraków, hybrid, fully-remote.