Fullstack Developer (Java/React)

🏢 Summary: Development of a cloud-native vehicle connectivity platform using Java and Spring on AWS, focused on microservices and enterprise integrations. The role involves designing, building, and maintaining scalable backend services integrated with multiple internal and external systems. The position requires active participation in DevOps-driven delivery within an agile environment. 🗂️ Requirements: 5+ years of experience with Java and Spring, Hands-on experience building cloud-native microservices, Experience with AWS services (EKS, SQS, SNS), Experience with DynamoDB, Working knowledge of Git, Experience with Kafka, Experience with Terraform, Experience with JIRA and Confluence, Experience working in Scrum or SAFe 📃 Skills: Java, Spring, AWS, EKS, SQS, SNS, DynamoDB, Microservices, Git, Kafka, Terraform, JIRA, Confluence, Scrum, SAFe 🏢 Description: Grape Up is a consulting and technology company that helps enterprises build their most critical applications using cloud-native technologies and modern software delivery practices. In collaboration with a legendary sports car manufacturer, we are building modern enterprise cloud solutions. Our team is responsible for implementing and maintaining the vehicle’s primary connectivity service – a central gateway for booking and managing mobile data packages within the vehicle. As a part of the complex architecture, it has various integrations with both the front-end and back-end services within the client’s ecosystem. If you want to be a part of the automotive market transformation and would like to contribute – this is the place and time! Responsibilities Design and build cloud-native applications using Java and Spring on top of AWS (EKS, SQS, SNS) Create world-class solutions using microservices-based architectures utilizing the DevOps culture approach Leverage DBs (DynamoDB), storage, and APIs into cloud applications and integrate with external services Cooperate with client’s team to optimize and improve existing solutions Actively participate in Scrum ceremonies and other meetings with the client, Product Owner, or Technical Leaders Research, recommend, and integrate solutions to solve architectural and development challenges Ensure that designs meet performance, security, usability, reliability, and scalability requirements Deep understanding and validation of business requirements to create an optimal solution Requirements 5+ years of professional experience with Spring and Java Hands-on experience in building cloud-native applications using microservices and cloud deployment Working knowledge of Git, Kafka, Terraform Experience using JIRA and Confluence Experience in SCRUM or SAFE agile framework Good communication skills, openness Analytical thinking and problem-solving skills Flexibility to travel to customer workshops when needed Very good command of English and Polish, both written and spoken (B2+/C1) Nice to have Knowledge of JavaScript/TypeScript Experience in using AI/LLM-powered tools in a professional context (e.g. ChatGPT with IntelliJ, Copilot, OpenCode) Benefits of joining Grape Up Non-corporate work environment among experienced engineers Individual growth & development plan supported by cyclical feedback sessions Access to knowledge platforms (e.g. Pluralsight) Equipment of your choice In-house business and tech trainings, and meetups Financing of conferences, external trainings, and certifications Language lessons (English, German and Polish for foreigners) LuxMed private medical care, MultiSport Mental health care with Wellbee Weekly Lunch & Learn where we meet up in the office, lunch together, and share our knowledge Employee referral program Rewards for the success of the month and year awarded by our employees Integration activities & trips Business travel opportunities to the USA, Spain, Germany, Ireland, and many other destinations

🏢 Summary: Development of a cloud-native connectivity platform for vehicles, focused on building and maintaining a central gateway for managing in-car mobile data packages. The role involves designing and implementing microservices-based solutions using Java, Spring, and AWS within a complex enterprise ecosystem. It requires close collaboration with client teams and adherence to DevOps and agile practices. 🗂️ Requirements: 5+ years of experience with Java and Spring, Experience building cloud-native microservices applications, Hands-on experience with AWS cloud services, Experience with Git, Experience with Kafka, Experience with Terraform, Experience with JIRA and Confluence, Experience working in Scrum or SAFe framework, Very good English (B2+/C1) 📃 Skills: Java, Spring, AWS, EKS, SQS, SNS, DynamoDB, Microservices, Git, Kafka, Terraform, JIRA, Confluence, Scrum, SAFe, JavaScript, TypeScript 🏢 Description: Grape Up is a consulting and technology company that helps enterprises build their most critical applications using cloud-native technologies and modern software delivery practices. In collaboration with a legendary sports car manufacturer, we are building modern enterprise cloud solutions. Our team is responsible for implementing and maintaining the vehicle’s primary connectivity service – a central gateway for booking and managing mobile data packages within the vehicle. As a part of the complex architecture, it has various integrations with both the front-end and back-end services within the client’s ecosystem. If you want to be a part of the automotive market transformation and would like to contribute – this is the place and time! Responsibilities Design and build cloud-native applications using Java and Spring on top of AWS (EKS, SQS, SNS) Create world-class solutions using microservices-based architectures utilizing the DevOps culture approach Leverage DBs (DynamoDB), storage, and APIs into cloud applications and integrate with external services Cooperate with client’s team to optimize and improve existing solutions Actively participate in Scrum ceremonies and other meetings with the client, Product Owner, or Technical Leaders Research, recommend, and integrate solutions to solve architectural and development challenges Ensure that designs meet performance, security, usability, reliability, and scalability requirements Deep understanding and validation of business requirements to create an optimal solution Requirements 5+ years of professional experience with Spring and Java Hands-on experience in building cloud-native applications using microservices and cloud deployment Working knowledge of Git, Kafka, Terraform Experience using JIRA and Confluence Experience in SCRUM or SAFE agile framework Good communication skills, openness Analytical thinking and problem-solving skills Flexibility to travel to customer workshops when needed Very good command of English, both written and spoken (B2+/C1) Nice to have Knowledge of JavaScript/TypeScript Experience in using AI/LLM-powered tools in a professional context (e.g. ChatGPT with IntelliJ, Copilot, OpenCode) Benefits of joining Grape Up Non-corporate work environment among experienced engineers Individual growth & development plan supported by cyclical feedback sessions Access to knowledge platforms (e.g. Pluralsight) Equipment of your choice In-house business and tech trainings, and meetups Financing of conferences, external trainings, and certifications Language lessons (English, German and Polish for foreigners) LuxMed private medical care, MultiSport Mental health care with Wellbee Weekly Lunch & Learn where we meet up in the office, lunch together, and share our knowledge Employee referral program Rewards for the success of the month and year awarded by our employees Integration activities & trips Business travel opportunities to the USA, Spain, Germany, Ireland, and many other destinations

🏢 Summary: The offer is for a DevOps/Cloud Engineer role focused on building, operating, and improving an AWS-based on-prem data platform for large-scale engineering and R&D workloads. The position centers on Kubernetes cluster management, infrastructure as code, and CI/CD automation to ensure platform scalability, reliability, and observability. The role involves close collaboration with data engineering teams to support workload migration and platform enhancements. 🗂️ Requirements: Hands-on experience with AWS services (VPC, EC2, EKS, ECS, S3, IAM, Cognito), Strong production experience with Kubernetes, Practical knowledge of Infrastructure as Code tools (Terraform, CloudFormation), Experience with CI/CD pipelines and deployment automation (ArgoCD, GitHub Actions, GitLab CI/CD), Proficiency in Python, Experience automating infrastructure and platform operations 📃 Skills: AWS, Kubernetes, Terraform, CloudFormation, ArgoCD, GitHub, GitLab, Python, VPC, EC2, EKS, ECS, S3, IAM, Cognito 🏢 Description: Grape Up is a consulting & technology company helping enterprises create the most important applications by leveraging AI & cloud-native technologies and modern ways of delivering software. Our projects are based on cooperation with international clients from government and industries such as automotive, insurance and finance. In cooperation with our client, we are building and operating an on-prem data platform used for large-scale engineering and R&D data processing. Our role focuses on AWS-based infrastructure with Kubernetes, automation, and close collaboration with data engineering teams to ensure scalability and reliability. Responsibilities Maintain, operate, and continuously improve an AWS infrastructure using Terraform code Deploy, configure and manage multiple Kubernetes clusters Develop and maintain CI/CD pipelines and deployment processes using GitHub Actions, Gitlab CI/CD or ArgoCD Ensure high platform reliability, scalability, and observability through proper monitoring and logging solutions Automate infrastructure and platform operations using Python, including scripts or Ansible playbooks Collaborate closely with platform users and developers to support migration of workloads and improve observability and security Requirements Experience with AWS services (VPC, EC2, EKS, ECS, S3, IAM, Cognito and others) Strong hands-on experience with Kubernetes in production environments Solid knowledge of IaC tools (Terraform, CloudFormation) Experience with CI/CD pipelines and deployment automation (ArgoCD, Github Actions, Gitlab CI/CD or similar tools) Proficiency in at least one programming language – preferably Python Good communication skills, both written and spoken Good command of English (B2+/C1) Fluency in Polish (min. B2 level) Nice to have Experience with Azure, especially with AKS, VNet and Entra ID Knowledge of monitoring and logging in distributed systems (CloudWatch, Prometheus, Grafana, OpenTelemetry or equivalents) Experience supporting developers and platform users Benefits of joining Grape Up Non-corporate work environment among experienced engineers Individual growth & development plan supported by cyclical feedback sessions Access to knowledge platforms (e.g. Pluralsight) Equipment of your choice Financing of conferences, external trainings, and certifications Language lessons (English, German and Polish for foreigners) LuxMed private medical care Weekly Lunch & Learn where we meet up in the office, lunch together, and share our knowledge Employee referral program Rewards for the success of the month and year awarded by our employees Special rewards for your years with us (G-Man) Integration activities

🏢 Summary: Development role focused on building and evolving a cloud-native application for the aviation industry in collaboration with an international team. The position involves implementing new features, contributing to architecture decisions, and ensuring high quality through best engineering practices. Work includes close cooperation with client-side teams and participation in technical discussions and product development. 🗂️ Requirements: Hands-on experience building cloud-native applications, Experience with microservices architecture, Experience with cloud deployment, Experience with RESTful APIs, Experience with Git and CI/CD pipelines, Experience with Jenkins, Experience with backend and frontend technologies (Python, Java/Spring, TypeScript, React), Very good English (B2+/C1), Willingness to travel to the UK every 2–3 months 📃 Skills: Python, Java, Spring, TypeScript, React, MaterialUI, Microservices, Cloud, REST, Git, CICD, Jenkins, AWS, Lambda, Databricks, AI, LLM 🏢 Description: Grape Up is a consulting & technology company, helping enterprises create the most important applications by leveraging AI & cloud-native technologies and modern ways of delivering software. In collaboration with a leading company in the aviation industry, we develop software for internal use. You will join a team composed of both Grape Up engineers and client-side specialists. In this role, you will be responsible for implementing new features in a recently released product, as well as contributing to its further evolution. Beyond feature development, you will actively participate in shaping the system’s architecture, introducing quality improvements, and promoting best practices and engineering standards across the project. The client’s team is based in the UK. We collaborate with them both remotely and during occasional short business trips. Responsibilities Develop software used in the aviation industry within an international environment Ensure high quality through best practices, testing, and continuous improvement Contribute to application architecture design and technical decision-making Collaborate closely with developers, QA engineers, and cross-functional teams Participate in meetings with the client and Product Owner Analyze business needs and translate them into technical requirements Requirements 3+ years of experience in Python and React Knowledge of Typescript, Material-UI Hands-on experience in building cloud-native applications using microservices and cloud deployment Experience with RESTful APIs to connect the app with backend services Experience with modern development tools (Git, CI/CD, Jenkins) Very good command of English, both written and spoken (B2+/C1) – daily collaboration within the team takes place in English Fluency in Polish (min. B2 level) Good communication skills, openness Self-reliance, determination, assertiveness Willingness to travel for business to the UK every 2–3 months for short, single-day trips Nice to have Experience in building serverless applications (AWS Lambda) Knowledge of Java Experience in Databricks Experience in using AI/LLM-powered tools in a professional context (e.g. ChatGPT with IntelliJ, Copilot, OpenCode) Benefits of joining Grape Up Non-corporate work environment among experienced engineers Individual growth & development plan supported by cyclical feedback sessions Access to knowledge platforms (e.g. Pluralsight) Equipment of your choice Financing of conferences, external trainings, and certifications Language lessons (English, German and Polish for foreigners) LuxMed private medical care Weekly Lunch & Learn where we meet up in the office, lunch together, and share our knowledge Employee referral program Rewards for the success of the month and year awarded by our employees Special rewards for your years with us (G-Man) Integration activities

🏢 Summary: Role focused on designing, deploying, and operating enterprise-grade OpenStack private cloud environments within an EU sovereign cloud platform for AI workloads. The position involves building automated infrastructure pipelines, ensuring high availability and security, and deploying solutions across customer data centers and EU-based cloud environments. You will contribute directly to the evolution and reliability of the cloud infrastructure layer. 🗂️ Requirements: 3+ years of production experience with OpenStack, Hands-on experience with core OpenStack services, Experience with Ceph distributed storage, Strong Linux system administration skills (Ubuntu preferred), Strong networking fundamentals, Experience with Terraform for infrastructure as code, Experience with Ansible for configuration management, Familiarity with CI/CD pipelines, Understanding of cloud security principles (network segmentation, IAM, secrets management) 📃 Skills: OpenStack, Ceph, Linux, Ubuntu, Terraform, Ansible, Networking, CICD, IAM, Security 🏢 Description: At Grape Up, we build Cloudboostr – an EU sovereign open cloud foundation purpose-built for enterprise AI workloads. Cloudboostr integrates a production-grade OpenStack private cloud infrastructure, a Kubernetes runtime layer, and an AI governance and orchestration layer into a single platform built entirely on upstream open-source components. As an OpenStack Engineer , you will be a core member of the Cloudboostr product team, developing the private cloud infrastructure layer that underpins everything else and deploying it in customer data centers and EU-based cloud environments across Europe. Responsibilities Design, deploy, and operate enterprise-grade OpenStack environments as part of the Cloudboostr platform Build and maintain automated infrastructure provisioning, upgrade, and backup pipelines using Terraform and Ansible Ensure high availability, resilience, and performance of private cloud infrastructure across on-premises and EU-based deployment models Implement and maintain network architectures and network security policies Collaborate closely with the product team to ensure seamless integration between the Cloudboostr’s infrastructure, runtime and AI layers Participate in incident response, root cause analysis, and continuous improvement of infrastructure reliability Contribute to the evolution of Cloudboostr’s infrastructure architecture – your insights feed directly into the product roadmap Requirements 3+ years of hands-on experience deploying and operating OpenStack in production environments Deep understanding of core OpenStack services Experience with Ceph for distributed storage Strong knowledge of Linux (Ubuntu preferred) system administration and networking fundamentals Experience with infrastructure-as-code using Terraform and configuration management (Ansible) Familiarity with CI/CD concepts and pipeline tooling Understanding of cloud security principles: network segmentation, IAM, secrets management Strong problem-solving skills and ability to operate independently in a product-oriented engineering team Fluency in English and Polish (min. C1 level) Nice to have Experience with Kubernetes and understanding of how OpenStack and Kubernetes interoperate Experience operating OpenStack at scale across multiple physical sites or regions Experience setting up and configuring GPU-enabled nodes in OpenStack Benefits of joining Grape Up Non-corporate work environment among experienced engineers Individual growth & development plan supported by cyclical feedback sessions Access to knowledge platforms (e.g. Pluralsight) Equipment of your choice Financing of conferences, external trainings, and certifications Language lessons (English, German and Polish for foreigners) LuxMed private medical care Weekly Lunch & Learn where we meet up in the office, lunch together, and share our knowledge Employee referral program Rewards for the success of the month and year awarded by our employees Special rewards for your years with us (G-Man) Integration activities

🏢 Summary: Hands-on Staff Software Engineer role focused on leading architecture and delivering AI-driven, production-grade platforms in a forward-deployed model. Combines technical leadership, direct client partnership, and deep involvement in building scalable distributed systems. Emphasizes Applied AI integration, mentorship, and ownership of technology decisions. 🗂️ Requirements: 7+ years of experience building web applications, 2+ years in a technical leadership role (Tech Lead or similar), Deep expertise in Python, Proven experience with complex, asynchronous, distributed systems, Ability to design and drive large-scale system architecture, Experience integrating AI/ML into production systems, Fluent English (C1/C2) 📃 Skills: Python, Ruby, PostgreSQL, AWS, Docker, Kubernetes, CI/CD, AI, ML 🏢 Description: Upside is a software consultancy built by engineers, for engineers. We partner with global companies to solve real, complex technical challenges. We’re deep into Applied AI and R&D, building both production-grade platforms for clients and our own open-source tools like Enthusiast (Agentic AI framework). We operate in a Forward-Deployed model. We don’t sit behind a wall of specs or wait for the tickets. We get into the trenches with the client, identify the actual challenges, and take full ownership of the solution. Our teams are small (3–9 people), autonomous, and cross-functional. What it means for you You are the technical North Star. You’ll be a peer and advisor to CTOs and founders, shaping the technical direction of their business. This is a hands-on leadership role: you’ll stay close to the code while guiding teams through massive architectural decisions. You have the mandate to choose the best tools and the responsibility to ensure technical excellence is a lived standard, not just a goal. You’ll mentor the next generation of engineers while pushing the boundaries of Applied AI. This is about scaling both systems and people. Role Overview As a Staff Software Engineer, you will guide engineering teams in delivering AI-driven solutions and production-grade platforms. You’ll balance high-level strategy with execution, ensuring that our architecture is resilient and our engineers are growing. Responsibilities Technical Vision: Drive the architecture and technology choices for large-scale, distributed systems. Strategic Partnership: Partner directly with clients and founders to co-create solutions that move the needle. Mentorship: Foster a culture of knowledge sharing and constructive feedback. Systemic Problem Solving: Anticipate technical debt and architectural risks before they impact the business. AI Leadership: Identify and implement opportunities to integrate AI/ML into client ecosystems. Requirements Experience: 7+ years of building web applications, with 2+ years in a leadership role (Tech Lead or similar). Core expertise: Deep mastery of Python. Ruby knowledge is a plus - it's present in some of our projects, but we are Python-first. Architectural Depth: Proven ability to oversee complex, asynchronous, and distributed systems. Consulting: Exceptional ability to balance technical depth with business context. AI-Native: You treat AI tooling (Claude, Cursor, and others) as a core part of your workflow, not a novelty - and you know how to multiply team velocity with it. English: Fluent (C1/C2) for high-level strategic discussions. Tech Stack: Python, Ruby, PostgreSQL, AWS, Docker, Kubernetes, CI/CD. 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 Compensation & Location Staff Software Engineer: 26 500- 37 000 PLN net + VAT Location: Office in Kraków, hybrid, fully-remote. 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

🏢 Summary: Senior Backend Engineer role focused on designing, building, and scaling resilient backend systems for international clients, with strong ownership of architecture and technical direction. The position involves close collaboration with stakeholders, Applied AI integration, and hands-on work in small, autonomous teams. It emphasizes production-grade systems, performance at scale, and strategic technical decision-making. 🗂️ Requirements: 5+ years of experience building web applications, Proficiency in Python and Python web frameworks, University degree in Computer Science, Data Science or related field, Strong understanding of monolith and microservices architectures, Knowledge of messaging patterns, Expert-level knowledge of PostgreSQL, Experience with database performance optimization at scale, Practical experience with CI/CD pipelines, Experience with Docker and cloud platforms (AWS or GCP), Ability to design and implement scalable backend architectures, Fluent English (C1) 📃 Skills: Python, PostgreSQL, AWS, GCP, Docker, Kubernetes, CI/CD, Microservices, Monoliths, Messaging, Ruby, Claude, Cursor 🏢 Description: Upside is a software consultancy built by engineers, for engineers. We partner with global companies to solve real, complex technical challenges. We’re deep into Applied AI and R&D, building both production-grade platforms for clients and our own open-source tools like Enthusiast (Agentic AI framework). We operate in a Forward-Deployed model. We don’t sit behind a wall of specs or wait for the tickets. We get into the trenches with the client, identify the actual challenges, and take full ownership of the solution. Our teams are small (3–9 people), autonomous, and cross-functional. What it means for you You'll work with a capable and driven team, and partner directly with senior business leaders on technical decisions, shaping systems - not just implementing them. You’ll have the autonomy to choose the right tools and the ownership to ensure the architecture performs under pressure.Your focus stays where it counts: mission-critical logic and high-impact experiments, not repetitive tasks and countless meetings. You’ll contribute to strategic open-source projects and build AI-driven solutions. Role Overview As a Senior Backend Engineer, you’ll be the backbone of our development efforts and a key driver of our engineering culture. You will design, build, and scale resilient systems for international clients while staying close to the code. We’re looking for someone who brings ready solutions rather than problems to solve, and treats the client’s product as their own. This isn't a short-term opportunity  - we’re looking for a partner to grow with us, someone who thrives in a highly collaborative environment and proactively shares "lessons learned" to level up the entire team. Responsibilities Drive technical direction: Own the architecture and implementation of complex backend systems. Problem Solving: Identify systemic risks before they manifest and propose clear, actionable ways to bypass them. Consulting: Work directly with stakeholders to translate business needs into scalable technology. Mentorship: Share your observations and "lessons learned" to help the whole team level up. AI Integration: Identify where Applied AI can actually improve a product and lead the implementation. Requirements Experience: 5+ years of building web applications (preferably in Python frameworks). Background: Completed university degree in computer science, data science or similar field Architecture: Deep understanding of monoliths, microservices, and messaging patterns. Databases: Expert knowledge of PostgreSQL and performance optimization at scale. Infrastructure: Practical experience with CI/CD, Docker, and AWS/GCP. Mindset: Proactive, technology-driven, and ready to experiment. AI-Native: You use tools like Claude or Cursor to move faster. English: Fluent (C1) for direct client collaboration. Our Tech Stack: Python, PostgreSQL, AWS, Docker, Kubernetes. Ruby is present in some of our projects but we are Python first. 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, without the approval process. 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. Compensation & Location Location: On-site in Kraków; Hybrid; remote from anywhere in Poland with regular team on-sites. Salary: Senior Engineer: 20 800 - 25 900 PLN net + VAT Lead Engineer: >26 500 PLN net + VAT If you’d like to understand more about how we work or read about the recruitment process in detail, feel free to explore our handbook . If something important to you isn’t mentioned - share your thoughts with as at careers@upsidelab.io

🏢 Summary: The offer is for a Backend Engineer role focused on building and scaling resilient backend systems and AI-driven platforms for global clients. You will work in small, autonomous teams, design production-grade architectures, and integrate Applied AI solutions into mission-critical products. The role emphasizes ownership, technical decision-making, and hands-on development using modern cloud and DevOps practices. 🗂️ Requirements: 2+ years commercial experience building web applications in Python or Ruby, Strong understanding of OOP principles, Knowledge of clean code practices, Understanding of software development lifecycle, Practical experience with SQL and relational databases, Experience with PostgreSQL, Experience with Git version control, Experience with Docker, Experience with CI/CD pipelines, Ability to integrate AI features into backend systems, Proficiency in written and spoken English 📃 Skills: Python, Ruby, PostgreSQL, SQL, AWS, Docker, Kubernetes, Git, CI/CD, OOP, Claude, Cursor 🏢 Description: Upside is a software consultancy built by engineers, for engineers. We partner with global companies to solve real, complex technical challenges. We’re deep into Applied AI and R&D, building both production-grade platforms for clients and our own open-source tools like Enthusiast (Agentic AI framework). We operate in a Forward-Deployed model. We don’t sit behind a wall of specs or wait for the tickets. We get into the trenches with the client, identify the actual challenges, and take full ownership of the solution. Our teams are small (3–9 people), autonomous, and cross-functional. What it means for you You won’t be assigned to a random project. You’ll partner directly with founders and CTOs on technical decisions, shaping systems - not just implementing them. You’ll  have the autonomy to choose  the right tools and the ownership to ensure the architecture performs under pressure.Your focus stays where it counts: mission-critical logic and high-impact experiments, not repetitive tasks and countless meetings. We don't do "safe or predictable". You’ll contribute to strategic open-source projects and build  AI-driven solutions. Role Overview As a Backend Engineer, you’ll be integral to building and scaling platforms for our global clients. You’ll join a high-performing team where your voice matters. You’ll design and implement resilient systems while staying close to the code, bringing solutions to the table instead of just reporting problems. Responsibilities Technical Execution: Build and maintain scalable backend systems with a focus on clean, maintainable code. Proactive Problem Solving: Identify issues early and propose actionable ways to fix or optimize them. Collaboration: Work closely with the team and stakeholders to translate requirements into working technology. Knowledge Sharing: Share your findings and lessons learned from the code to help the team grow. AI Implementation: Support the integration of Applied AI features into client products. Requirements Experience: 2+ years of commercial experience in building web applications (Python or Ruby). Fundamentals: Solid understanding of OOP, clean code, and software development lifecycles. Databases: Practical knowledge of SQL and relational databases (PostgreSQL). Infrastructure: Experience with Git, Docker, and CI/CD pipelines. Mindset: Proactive, curious, and ready to take ownership of your tasks. AI-Native: You use tools like Claude or Cursor to work smarter and faster. English: Great command of written and spoken English for team and client communication. Tech Stack: Python, Ruby, PostgreSQL, AWS, Docker, Kubernetes. 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 Salary: Regular Engineer: 10 000 - 13 600 PLN net + VAT Regular+ Engineer: 14 800 - 19 300 PLN net + VAT Location: Office in Kraków, hybrid, fully-remote.

🏢 Summary: Backend Engineer role focused on building and maintaining scalable, resilient web-based platforms for global clients. The position involves working in small teams to deliver robust backend systems aligned with client requirements. The role includes developing modern APIs and supporting infrastructure using a contemporary technology stack. 🗂️ Requirements: 2+ years commercial experience in web-based application development, Experience with Ruby, Python, or JavaScript, Experience with SQL databases, Experience with AWS, Docker, or Kubernetes, Strong OOP skills, Experience with Git, Experience with unit testing, Experience with debugging and profiling, Experience with CI/CD, Experience in building modern APIs, Understanding of end-to-end software development cycle 📃 Skills: Ruby, Python, JavaScript, SQL, AWS, Docker, Kubernetes, OOP, Git, CI, CD, APIs, Testing, Debugging, Profiling, Vue.js, React.js, Node.js 🏢 Description: At Upside , we’re not just shipping features - we’re partnering with ambitious companies across the globe to solve complex, meaningful problems through technology. We work in small, 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 , an AI Agent framework tailored for e-commerce use cases. Role Overview: As a Backend Engineer, you will be integral to the process of building and maintaining platforms that meet the needs of our global clients. Your work will significantly support the infrastructure of the solutions directed towards clients. You'll be part of a development team, sized between 3 to 9 members, dedicated to crafting scalable and resilient backend systems. This role involves collaborating closely with both the development team and our clients, ensuring that our backend solutions are perfectly aligned with client requirements and expectations. Job requirements → Relevant commercial experience in building web-based application (>2 years). → Experience in at least one of Upside’s core technology stack: Ruby, Python, JavaScript or the willingness to learn based on your current skills.→ Deep understanding of end-to-end software development cycle. → Great command of written and spoken English. Relevant technology skills: →  Experience with SQL databases. →  Experience with orchestration tools (e.g. AWS/Docker/Kubernetes ). →  Solid OOP skills. →  Experience with Git, unit testing, debugging, and profiling. →  Experience with Continuous Integration and Continuous Delivery. →  Experience in creating modern APIs. →  Knowledge of frontend frameworks and tools (e.g. Vue.js, React.js ) is nice to have. →  Knowledge of Node.js, JavaScript is nice to have. 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 Salary : Regular Engineer: 10 000 - 13 600 PLN net + VAT Regular+ Engineer: 14 800 - 19 300 PLN net + VAT Location: Office in Kraków, hybrid, fully remotely.

🏢 Summary: Remote role focused on building scalable data pipelines and AI-driven solutions for datacenter development planning systems. The position involves integrating multiple data sources, configuring AI agents, and delivering BI-ready outputs while collaborating directly with clients. It offers high autonomy and ownership across the full software development lifecycle. 🗂️ Requirements: 4+ years software development experience across full SDLC, 3+ years hands-on experience with Java, Strong SQL skills, Experience working with databases, Practical experience developing or configuring AI Agents, Experience in system integration, Client-facing communication experience in English, Ability to design and implement architecture solutions 📃 Skills: Java, SQL, Databases, AI, ETL, GCP, Python, BI 🏢 Description: Are you passionate about building scalable, high-performance platforms that power the next generation of data-driven applications? Join our dynamic team working on mission-critical software systems for Datacenter development planning - all in a fully remote work environment . We manage complex supply timelines and supplier relationships, delivering solutions that make a real impact for our clients. If you thrive in a modern, autonomous engineering environment and enjoy direct collaboration with stakeholders, we want to hear from you! If you're ready to make an impact in a dynamic environment, we want to hear from you! Responsibilities Build robust data pipelines integrating information from multiple data sources Configure and develop AI Agents to process and analyze data efficiently Transform and optimize agent outputs into BI-friendly formats for business intelligence use Communicate directly with clients on a daily basis to gather requirements and provide updates Propose and implement design and architecture solutions for your deliverables Collaborate with world-class engineers, architects, and product managers Focus on development activities in an environment with minimal meetings and high autonomy Requirements 4+ years of experience in software development and integration across the full system implementation lifecycle (analyze, design, implement, build, test, support) 3+ years of hands-on experience with Java Strong SQL skills and experience working with databases Practical experience in developing or configuring AI Agents Excellent English communication skills, with proven experience in client-facing roles Strong self-management and prioritization abilities Nice to have Experience with Google Cloud Platform (GCP) Python programming skills ETL (Extract, Transform, Load) experience Familiarity with Agent Development Kit We offer/Benefits We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.