Site Reliability Engineer (m/f/d) 🚀

🏢 Summary: Fully remote Senior DevOps / SysOps Engineer role focused on deep Linux infrastructure, advanced troubleshooting, and operational excellence in complex production environments. The position involves managing, securing, automating, and optimizing Linux-based systems, containers, virtualization, and CI/CD pipelines. The role requires strong hands-on expertise across OS internals, networking, security, and infrastructure automation. 🗂️ Requirements: Strong experience as Senior DevOps / SysOps / Linux / Infrastructure Engineer, Deep understanding of Linux systems and OS internals, Advanced Linux administration and troubleshooting skills (L3+ level), Experience with Bash, Python, Ansible, Strong knowledge of TCP/IP, routing, firewalls, network diagnostics, Experience with Linux security and system hardening (SELinux), Experience with container technologies, Experience with virtualization platforms (KVM, VMware or similar), Understanding of CI/CD and deployment automation, Ability to troubleshoot complex production environments independently 📃 Skills: Linux, Bash, Python, Ansible, TCP/IP, SELinux, Docker, Kubernetes, Podman, KVM, VMware, Jenkins, CI/CD, systemd, SSH, PostgreSQL, Zabbix, OpenSearch 🏢 Description: Bytamic is an international IT services and Consulting company with its headquarters in Vienna, Austria and subsidiary companies in Warsaw and Poznan. We work with multinational companies and we drive digital transformation for our clients. We are truly agile, work with the latest technologies and our engineers and scrum-teams deliver state-of-the-art product development services for our clients. Delivering with highest quality standards is key to us – therefore we focus on continuous training & education of our engineers. Client's description Global leader in communication and information solutions for safety-critical environments, with over 75 years of innovation and excellence. Operating across sectors such as civil aviation, defense, public safety, maritime, and public transportation, the company delivers cutting-edge solutions tailored to user needs worldwide. Role Overview For our Client we are looking for a qualified partner for Senior DevOps / SysOps Engineer (m/f/d) position with a strong Linux background and deep operational expertise. The role is ideal for someone who understands systems under the hood - not only at the tooling level, but also at the operating system, security, networking, and infrastructure layers. It is good to have strong troubleshooting skills, broad infrastructure knowledge, and practical experience working in complex production environments. The position is fully remote. Key Responsibilities Troubleshoot complex Linux infrastructure and operating system issues at L3/L4 escalation level Analyze logs, diagnose incidents, perform root cause analysis, and resolve production problems Manage and maintain Linux systems and services, including: systemd, boot process, SSH, permissions, service management, performance tuning Work with Linux internals and core operating system concepts: processes, memory management (RAM/swap, filesystems, networking, initramfs, kernel basics Configure and maintain Linux security mechanisms, including SELinux, hardening, and security policies Support secure infrastructure practices and vulnerability analysis Build and improve automation and operational tooling using Bash, Python, and Ansible Support CI/CD pipelines and deployment automation processes (Jenkins or similar tools) Work with containerized workloads and container technologies (Docker / Podman / Kubernetes basics) Manage and support virtualization environments (KVM preferred, VMware or similar also acceptable) Monitor, optimize, and improve system reliability, stability, and performance Collaborate with development and infrastructure teams on operational improvements and system integrations Participate in platform hardening, infrastructure improvements, and operational automation initiatives Required Skills & Experience Strong experience as Infrastructure Engineer/ Systems Engineer/ Senior Linux Administrator/ DevOps / SysOps Engineer with strong infrastructure background Deep understanding of Linux systems and operating system internals Very good practical knowledge of: Linux administration, troubleshooting, system services, logs, networking, permissions, security Strong production troubleshooting and analytical skills Experience working at advanced escalation/support levels (L3+) Hands-on experience with: Bash, Python, Ansible, administrative scripting Good understanding of: TCP/IP, routing, firewalls, network diagnostics Experience with Linux security and system hardening, especially SELinux General knowledge of containerization technologies: Docker, Kubernetes, Podman General virtualization knowledge (KVM, VMware, or similar) Understanding of CI/CD concepts and deployment automation Ability to build solutions, integrate components, and solve infrastructure problems independently Strong hands-on and engineering-oriented mindset Nice to Have Experience in: SRE, Infrastructure Engineering Experience with observability and monitoring tools: Zabbix, OpenSearch, Data Prepper, Fluent Bit Basic PostgreSQL administration knowledge What you can expect from us: Fully remote work Long-term cooperation on enterprise-scale systems Challenging infrastructure and automation projects International engineering environment Career development and continuous learning opportunities Training and education budget Partial reimbursement for private healthcare and Multisport Language classes Modern equipment Attractive remuneration Employee referral program Team events and integration meetings If you can deeply understand Linux and infrastructure can diagnose and troubleshoot complex problems independently understand how containers and infrastructure work internally - not only how to use them are a cross-functional engineer combining administrator, infrastructure, and automation skills are a person who values ownership, autonomy, and continuous learning we would like to hear from you:) #linux #infrastructure #systemsengineer #devops #sysops #sre #automation #remote #itjobs #poland

🏢 Summary: B2B role for an experienced QA Automation Engineer/SDET to design, develop, and scale Python-based UI and backend test automation frameworks for complex distributed systems. The position focuses on improving automation standards, reliability, and quality metrics while working with CI/CD pipelines and event-driven architectures. The role involves end-to-end ownership of test automation across multiple product areas in a remote or Warsaw-based setup. 🗂️ Requirements: Minimum 4+ years in Software Testing, QA Engineering or SDET roles, Strong experience in designing and developing test automation frameworks at scale, Advanced Python programming skills, Experience with API and backend testing in distributed systems, Hands-on experience with UI test automation tools, Strong SQL knowledge with ability to write complex queries, Experience with CI/CD pipelines and related tools, Practical knowledge of Linux environments and networking concepts, Experience with event-driven architectures or messaging systems, Strong debugging and log analysis skills, Ability to work independently and own automation across product areas, Experience contributing to or improving automation frameworks and standards 📃 Skills: Python, PyTest, Playwright, Selenium, SQL, Linux, Kafka, CircleCI, Git, Jira, TestRail, Sentry, CI/CD, API, Networking 🏢 Description: LLInformatics is an IT consulting company with dozens of satisfied clients across Europe and North America. We serve businesses that expect their challenging projects to be delivered according to plan, with impeccable quality, and under strict compliance requirements. Our remote-first team of 100+ experts specializes in building high-quality digital products. We set a new standard in our industry through data-driven decisions, measurable outcomes, a strategic mindset, and a solid work culture. Contract Type: B2B Location: Warsaw or the possibility of Remote work Your tasks and responsibilities: Design, develop, and maintain UI test automation frameworks for complex systems Work extensively with Python-based frameworks (e.g., PyTest, Playwright) and enhance existing automation libraries Apply strong Linux and networking knowledge in daily testing and debugging Write complex SQL queries for test data validation and automation support Deliver high-quality defect reports with logs, root cause analysis, and reproduction details Work with event-driven systems (e.g., Kafka in payments-related domains) Use and promote tools such as Jira, TestRail, Sentry, Git, and CircleCI within CI/CD workflows Independently deliver automation across multiple product areas Identify gaps in test coverage and proactively mitigate automation risks Continuously improve automation effectiveness and contribute to QA KPIs Drive reliability improvements in frameworks, tools, and test suites Communicate risks, blockers, and technical issues Take full ownership of quality for assigned areas Collaborate closely with engineers, architects, DevOps, and product teams Participate in cross-team discussions to improve system testability and design Share knowledge and best practices across engineering teams Oversee consistency and quality of Python-based automation frameworks Define and evolve automation standards and best practices Guide teams in selecting high-value test cases for automation Track and report key automation and quality metrics Support onboarding of new engineers and ensure smooth ramp-up Requirements: Minimum 4+ years of experience in Software Testing, QA Engineering, or SDET roles Strong hands-on experience in test automation design and development at scale Advanced Python programming skills with ability to build and maintain robust automation frameworks Experience with API and backend testing in complex distributed systems Practical knowledge of UI test automation tools (e.g., Playwright, Selenium or similar) Strong understanding of SQL, including writing complex queries for test data validation and automation purposes Experience working with CI/CD pipelines and related tools (e.g., CircleCI or similar) Familiarity with Linux environments and networking concepts used in day-to-day testing work Experience with event-driven architectures or messaging systems (Kafka experience is a strong plus) Solid understanding of debugging, log analysis, and root cause investigation in production-like environments Ability to read, interpret, and work with technical and functional documentation in English Strong ownership mindset with ability to work independently across multiple product areas Proven ability to improve or contribute to automation frameworks and testing standards Experience mentoring or supporting junior engineers is highly valued Strong collaboration skills and experience working closely with developers, DevOps, and product teams Why join us? Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office, you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk. Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: Senior Ruby on Rails engineer role focused on designing and building scalable, production-grade backend systems and APIs in a remote-first environment. The position involves architectural decision-making, performance optimization, mentoring, and close collaboration with cross-functional teams. The offer includes flexible remote work within the EU, modern equipment, and a strong engineering culture emphasizing quality and automation. 🗂️ Requirements: 6+ years commercial experience with Ruby on Rails, Strong experience building production-grade APIs and backend systems, Advanced knowledge of PostgreSQL, Experience with database optimization and data modeling, Strong experience with RSpec and automated testing, Experience with AWS and/or Heroku, Understanding of distributed systems and system architecture, Experience working in Agile environments, English proficiency at B2+ level 📃 Skills: Ruby, Rails, PostgreSQL, RSpec, AWS, Heroku, APIs, SQL, Git, Agile 🏢 Description: About us LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 130+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry—backed by a strong, collaborative work culture that fuels our success. Contract Type: B2B Location: Remote or in our Warsaw office Your Tasks and Responsibilities: Design, develop, and own complex backend features and APIs using Ruby on Rails. Architect scalable, reliable, and maintainable backend services. Collaborate closely with Product, QA, DevOps, and business stakeholders to translate requirements into technical solutions. Drive improvements in system performance, scalability, reliability, and engineering quality. Write clean, production-grade code with strong automated test coverage. Review code, establish engineering standards, and contribute to architectural decisions. Troubleshoot complex production issues and support stable, efficient deployments. Participate in agile delivery processes and drive continuous improvement initiatives. Mentor other engineers and actively contribute to knowledge sharing within the team. Requirements: 6+ years of commercial Ruby on Rails experience. Strong experience designing and building production-grade APIs and backend systems. Advanced knowledge of PostgreSQL, database optimization, and data modeling. Strong experience with RSpec, automated testing, and engineering best practices. Experience with AWS and/or Heroku. Good understanding of distributed systems, scalability, and system architecture. Experience working in Agile environments. Strong communication skills in English (B2+). Nice to Have: Technical leadership or mentoring experience. Experience with observability, monitoring, and performance optimization. Experience participating in architectural discussions and technical decision-making. Experience working directly with international stakeholders. Why join us? Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings. Work from Anywhere – Choose your ideal setup! Work 100% remotely within the EU , go hybrid , or enjoy our Warsaw office , fully equipped for productivity. Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office , you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk . Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: B2B contract opportunity for an experienced Ruby on Rails Backend Developer to design, build, and maintain scalable backend services and production-grade APIs in a remote-first environment. The role focuses on delivering high-quality, reliable, and performant solutions in close collaboration with cross-functional teams. Candidates will work in an agile setup, contributing to architecture decisions, automated testing, and continuous improvement initiatives. 🗂️ Requirements: 4+ years of commercial experience with Ruby on Rails, Experience building and maintaining production-grade APIs and backend systems, Knowledge of PostgreSQL and relational database design, Experience with RSpec and automated testing, Experience with AWS and/or Heroku, Understanding of software architecture principles and backend scalability, Experience working in Agile environments, English proficiency at B2+ level 📃 Skills: Ruby, Rails, PostgreSQL, RSpec, AWS, Heroku, Sidekiq, SQL, REST, Git 🏢 Description: About us LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 130+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry—backed by a strong, collaborative work culture that fuels our success. Contract Type: B2B Location: Remote or in our Warsaw office Your Tasks and Responsibilities: Design, develop, and maintain backend features and APIs using Ruby on Rails. Build scalable backend services supporting business applications. Collaborate with Product, QA, and DevOps teams to deliver business-focused solutions. Improve application performance, reliability, maintainability, and scalability. Write clean, production-ready code with appropriate test coverage (unit and integration tests). Participate in code reviews and follow engineering best practices. Troubleshoot application issues and support production deployments. Participate in agile development processes and contribute to continuous improvement initiatives. Requirements: 4+ years of commercial Ruby on Rails experience. Strong experience building and maintaining production-grade APIs and backend systems. Good knowledge of PostgreSQL and relational database design. Experience with RSpec and automated testing. Experience with AWS and/or Heroku. Understanding of software architecture principles and backend scalability concepts. Experience working in Agile environments. Strong communication skills in English (B2+). Nice to Have: Experience with background processing solutions (e.g., Sidekiq). Experience with monitoring, observability, and performance optimization. Experience working with international teams and stakeholders. Why join us? Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings. Work from Anywhere – Choose your ideal setup! Work 100% remotely within the EU , go hybrid , or enjoy our Warsaw office , fully equipped for productivity. Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office , you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk . Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: Remote Lead Site Reliability Engineer role in a dynamic international tech project, focused on building, scaling, and operating modern cloud-based platforms. The position involves platform/system engineering, containerization, infrastructure as code, and multi-cloud deployments at scale. 🗂️ Requirements: 4+ years Platform/System Engineering experience, Proficiency in Go, Python, Java, or Ruby, 3+ years experience in engineering role within distributed teams, Hands-on experience with Docker and Kubernetes, Experience with GitHub Actions, ArgoCD, EKS, AKS, or ECS, Experience with Infrastructure as Code in multi-cloud environments, Experience building and operating cloud applications on AWS, Azure, or GCP, Experience with Chef, Degree in Computer Science, Computer Engineering, or related field (or equivalent experience) 📃 Skills: Go, Python, Java, Ruby, Docker, Kubernetes, GitHub, ArgoCD, EKS, AKS, ECS, AWS, Azure, GCP, Chef, Ansible, Terraform, IaC 🏢 Description: This is a remote position. Virtusa helps its Clients by becoming a true extension of their software and data development capabilities. Through the readily set up, comprehensive, and self-governing teams, we let our Clients focus on their business while we make sure that their software products and data tools scale up accordingly and with outstanding quality. We are looking for team player to fill Lead Site Reliability Engineer position in a dynamic international project for the customer from the Tech area . Requirements 4+ years of hands-on Platform/System Engineering experience using Go, Python, Java, Ruby, or equivalent programming languages. 3+ years of experience in an engineering role, working with a diverse and distributed team located across the globe. Hands-on experience with containerization technologies (Docker, Kubernetes, GitHub Actions, ArgoCD, EKS, AKS, ECS). Exposure to Infrastructure as Code (IaC) with Multi-Cloud Deployments. Proven experience building and reliably running modern full-stack cloud applications using public cloud technologies (AWS, Azure, GCP) at scale. Effective written and verbal communication skills to properly articulate complex technical problems to all levels of the organization and customers. Confidence in the ability to own and deliver a roadmap tied to business priorities. A passion for excellence, a natural problem solver, and a critical thinker who enjoys digging deep to understand issues and solve hard problems. Degree in Computer Science, Computer Engineering, or a related field (or equivalent experience). Experience with modern infrastructure management systems- Chef is must have (Ansible, Terraform). Nice to have: Expertise in building Platform-as-a-Service (PaaS) solutions. Benefits Professional training programs Work with a team that’s recognized for its excellence. We’ve been featured in the Deloitte Technology Fast 50 & FT 1000 rankings. We’ve also received the Great Place To Work® certification for five years in a row

🏢 Summary: Hands-on Site Reliability Engineer role focused on ensuring stability, scalability, and observability of a mission-critical distributed risk and analytics platform in hybrid cloud environments. The position centers on production reliability, incident response, automation, and continuous improvement of monitoring and deployment processes. You will collaborate with engineering teams to strengthen system resilience, performance, and operational standards. 🗂️ Requirements: Strong Java experience in distributed systems, Experience with observability and monitoring tools, Hands-on experience with hybrid cloud environments (preferably GCP), Experience with CI/CD pipelines and automation tools, Solid knowledge of Linux systems administration, Understanding of RDBMS fundamentals, Experience with job schedulers (e.g., Control-M), Ability to lead incident response and root-cause analysis 📃 Skills: Java, Grafana, Prometheus, Loki, OpenTelemetry, GCP, Jenkins, Ansible, Linux, SQL, Control-M, CI/CD 🏢 Description: We’re looking for a seasoned Site Reliability Engineer to support a high‑performance, mission‑critical risk and analytics platform used across global trading and finance environments. You’ll play a key role in ensuring the stability, scalability, and observability of complex distributed systems running across hybrid cloud infrastructure. In this role, you’ll take ownership of production reliability driving incident response, conducting root‑cause analysis, improving monitoring capabilities, and delivering automation that reduces operational toil. You’ll work closely with development teams, platform engineers, and service management leads to strengthen resilience, refine processes, and enhance the engineering culture around availability and performance. This is a hands on technical position suited to someone who thrives in high‑throughput environments, communicates clearly, and enjoys solving deep engineering problems in real time. Core Responsibilities Maintain and improve the reliability, uptime, and performance of distributed applications. Lead incident response, triage complex issues, coordinate recoveries, and deliver structured post‑incident reviews. Enhance observability—designing and evolving monitoring, alerting, logging, and tracing frameworks. Drive continuous improvement across automation, deployment processes, and service stability. Collaborate with cross‑functional teams to influence architecture, design, and operational standards. Support CI/CD pipelines, environment configuration, and vulnerability remediation. Contribute to a knowledge‑driven culture through documentation, tooling, and best‑practice adoption. Required Skills & Experience Strong Java background with proven experience supporting or developing distributed systems. Observability tooling expertise (Grafana, Prometheus, Loki, OpenTelemetry or similar). Hands‑on with hybrid cloud environments , ideally with GCP or another major cloud provider. CI/CD and automation experience (e.g., Jenkins, Ansible). Solid understanding of Linux , RDBMS fundamentals , and job schedulers (e.g., Control‑M or equivalents). Strong analytical mindset with a methodical approach to troubleshooting. Excellent communication skills and comfort working in Agile teams.

🏢 Summary: The role focuses on ensuring reliability, scalability, and performance of large-scale cloud-based applications by building and maintaining resilient infrastructure. You will manage AWS cloud environments, Kubernetes clusters, and CI/CD pipelines while implementing monitoring, automation, and incident response processes. The position emphasizes Infrastructure-as-Code, observability, and continuous reliability improvements. 🗂️ Requirements: 5+ years experience in SRE, DevOps or similar role, Strong experience with AWS cloud services, Experience with Infrastructure-as-Code tools, Hands-on experience with Kubernetes, Proficiency with Docker, Experience with CI/CD pipelines, Solid knowledge of PostgreSQL or Amazon RDS, Strong SQL knowledge, Knowledge of networking concepts (VPC, DNS, troubleshooting), Strong Linux/Unix administration skills, Experience with observability tools, Experience with automation in infrastructure, Experience with incident management 📃 Skills: AWS, Terraform, Pulumi, Kubernetes, EKS, Docker, GitHub, PostgreSQL, RDS, SQL, VPC, DNS, Linux, Unix, Prometheus, Grafana, Datadog, Dynatrace, CI/CD 🏢 Description: We are looking for an experienced Site Reliability Engineer to ensure the reliability, scalability, and performance of large-scale cloud-based web applications. You will work closely with software development, cloud operations, and platform teams to build and maintain resilient infrastructure and improve system stability. Key Responsibilities: Design and maintain monitoring, alerting, and incident response systems to ensure high availability Collaborate closely with engineering, product, and architecture teams Build and manage cloud infrastructure using Infrastructure-as-Code (e.g., Terraform, Pulumi) on AWS Operate and optimize Kubernetes environments (e.g., EKS) Develop and maintain containerized applications using Docker Improve CI/CD pipelines and drive automation across deployment processes Implement and manage observability tools (logging, metrics, tracing) Participate in incident management, postmortems, and reliability improvements Support capacity planning, disaster recovery, and system scaling Contribute to security, compliance, and operational best practices Develop automation and AI-driven solutions for monitoring and incident prevention Requirements: 5+ years of experience in SRE, DevOps, or similar roles Strong experience with AWS cloud services and Infrastructure-as-Code tools Hands-on experience with Kubernetes and containerized environments Proficiency in Docker and CI/CD pipelines (e.g., GitHub Actions) Solid understanding of databases (e.g., PostgreSQL, Amazon RDS) and SQL Knowledge of networking concepts (VPC, DNS, troubleshooting tools like dig/traceroute) Strong Linux/Unix administration skills Experience with observability tools (e.g., Prometheus, Grafana, Datadog, Dynatrace) Familiarity with automation and AI-based solutions in infrastructure Strong problem-solving and incident management skills

🏢 Summary: Senior Ruby on Rails Developer responsible for building and maintaining production-grade server-side applications, implementing new features, and ensuring high code quality through testing and reviews. The role involves working with AWS-based environments, optimizing performance and scalability, and contributing to frontend components in React. The position requires close collaboration with cross-functional teams in a remote or hybrid setup. 🗂️ Requirements: 6+ years of experience with Ruby on Rails, Experience with Active Record and RSpec, Experience with AWS or Heroku in production environments, Experience with PostgreSQL or other RDBMS, Experience writing unit, integration, and E2E tests, Experience with TDD or strong testing practices, Experience building applications using MVC pattern, Experience building React components and integrating APIs, Understanding of distributed systems, Experience designing and consuming REST APIs, Knowledge of Agile methodologies (Scrum or Kanban), Polish and English at minimum B2 level 📃 Skills: Ruby, Rails, ActiveRecord, RSpec, AWS, Heroku, PostgreSQL, RDBMS, React, REST, MVC, TDD, Scrum, Kanban 🏢 Description: About us LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 130+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry—backed by a strong, collaborative work culture that fuels our success. Contract Type: B2B Location: Remote or in our Warsaw office Your Tasks and Responsibilities: Implementing new functionalities on our client’s platform. Solving complex programming challenges while improving your knowledge. Conducting regular code reviews / PR reviews for your colleagues. Maintaining existing code and fixing bugs. Writing unit, integration, and E2E tests. Contributing to frontend components using React when needed. Supporting rapid iteration, experimentation, and data-driven development initiatives. Optimizing application performance, reliability, and scalability. Collaborating with Product Managers and cross-functional teams to align engineering execution with product vision. Requirements: 6+ years of experience in Ruby on Rails. Familiarity with Active Record and RSpec. Experience working on production applications in AWS or Heroku. Experience working with RDBMS like PostgreSQL. Experience writing tests / following a TDD approach or strong testing culture. Experience building server-side applications using the MVC pattern or similar. React experience (building components, integrating APIs). Understanding distributed systems and resilient applications. Practical knowledge of REST API communication. Polish and English at B2+ minimum level. Familiarity with Agile methodologies (Scrum, Kanban). Experience as a tech team lead is a strong plus. Demonstrated ability to leverage AI tools to improve workflows or development efficiency is a plus. Why join us? Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings. Work from Anywhere – Choose your ideal setup! Work 100% remotely within the EU , go hybrid , or enjoy our Warsaw office , fully equipped for productivity. Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office , you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk . Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: B2B contract for a Senior Ruby on Rails Developer to build and enhance a client platform, focusing on backend development, testing, performance optimization, and occasional React frontend work. The role involves solving complex engineering challenges, conducting code reviews, and collaborating with cross-functional teams in a remote-first environment. Emphasis is placed on scalable, reliable systems and data-driven product development. 🗂️ Requirements: 5+ years Ruby on Rails experience, Strong knowledge of ActiveRecord, Experience with RSpec, Experience with AWS or Heroku in production, Experience with PostgreSQL or other RDBMS, Experience with TDD and automated testing, Experience building MVC-based server-side applications, Experience building React components and integrating APIs, Understanding of distributed systems, Practical knowledge of REST APIs, B2+ level Polish and English, Experience with Agile methodologies 📃 Skills: Ruby, Rails, ActiveRecord, RSpec, AWS, Heroku, PostgreSQL, RDBMS, TDD, MVC, React, REST, Scrum, Kanban 🏢 Description: About us LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 130+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry—backed by a strong, collaborative work culture that fuels our success. Contract Type: B2B Location: Remote or in our Warsaw office Your Tasks and Responsibilities: Implementing new functionalities on our client’s platform. Solving complex programming challenges while improving your knowledge. Conducting regular code reviews / PR reviews for your colleagues. Maintaining existing code and fixing bugs. Writing unit, integration, and E2E tests. Contributing to frontend components using React when needed. Supporting rapid iteration, experimentation, and data-driven development initiatives. Optimizing application performance, reliability, and scalability. Collaborating with Product Managers and cross-functional teams to align engineering execution with product vision. Requirements: 5+ years of experience in Ruby on Rails. Familiarity with Active Record and RSpec. Experience working on production applications in AWS or Heroku. Experience working with RDBMS like PostgreSQL. Experience writing tests / following a TDD approach or strong testing culture. Experience building server-side applications using the MVC pattern or similar. React experience (building components, integrating APIs). Understanding distributed systems and resilient applications. Practical knowledge of REST API communication. Polish and English at B2+ minimum level. Familiarity with Agile methodologies (Scrum, Kanban). Experience as a tech team lead is a strong plus. Demonstrated ability to leverage AI tools to improve workflows or development efficiency is a plus. Why join us? Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings. Work from Anywhere – Choose your ideal setup! Work 100% remotely within the EU , go hybrid , or enjoy our Warsaw office , fully equipped for productivity. Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office , you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk . Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.

🏢 Summary: B2B contract for a senior backend-focused engineer to design and develop scalable APIs and services using Ruby on Rails, with supporting frontend work in React. The role involves building production-grade systems, ensuring high test coverage, and improving performance, reliability, and scalability in a distributed environment. 🗂️ Requirements: 6+ years commercial experience with Ruby on Rails, Experience building production APIs and backend systems, Entry-level experience with React (components, state management, API integration), Knowledge of PostgreSQL and relational databases, Experience with RSpec and automated testing, Experience with AWS and/or Heroku, Understanding of scalable and distributed systems, Experience working in Agile teams, English and Polish at minimum B2+ 📃 Skills: Ruby, Rails, React, PostgreSQL, SQL, RSpec, AWS, Heroku, API, REST, JavaScript, Git 🏢 Description: About us LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 130+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry—backed by a strong, collaborative work culture that fuels our success. Contract Type: B2B Location: Remote or in our Warsaw office Your Tasks and Responsibilities: Design and develop backend features and APIs using Ruby on Rails as the primary technology stack. Contribute to frontend development in React, including building components and integrating APIs when needed. Build scalable backend services and APIs powering applications. Develop reusable frontend components and maintain a clean UI architecture. Collaborate directly with Product, Design, QA, and DevOps teams to deliver business-focused solutions. Improve application performance, reliability, scalability, and maintainability. Write clean, production-grade code with strong test coverage (unit, integration, E2E). Review code, maintain engineering standards, and support technical decision-making. Troubleshoot production issues and support stable deployments. Participate in agile delivery processes and contribute to continuous improvement. Support knowledge sharing and technical mentorship within the team. Requirements: 6+ years of commercial Ruby on Rails experience. Solid entry-level React experience (components, state management, API integration). Strong experience building production APIs and backend systems. Good knowledge of PostgreSQL and relational databases. Experience with RSpec, automated testing, and strong engineering practices. Experience with AWS and/or Heroku. Understanding of scalable and distributed systems. Experience working in Agile teams. Strong communication skills in English at a minimum B2+ level. Nice to Have: Tech Lead or mentoring experience. Experience with observability, monitoring, and performance optimization. Experience working directly with international stakeholders. Why join us? Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings. Work from Anywhere – Choose your ideal setup! Work 100% remotely within the EU , go hybrid , or enjoy our Warsaw office , fully equipped for productivity. Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team. Flat Structure – We value initiative and open communication. Every voice matters here! Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable. Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world. Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow. Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office , you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk . Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.