Lead Backend (Scala) Engineer

🏢 Summary: Senior Scala + Java Engineer role focused on designing and building scalable, event-driven backend systems for a large European online marketplace. The position involves working with functional programming principles, distributed systems, and cloud infrastructure to enhance performance and reliability. You will contribute to architectural decisions and improve CI/CD, observability, and system resilience. 🗂️ Requirements: 4+ years of backend development experience in Scala and Java, Strong commercial experience with Scala, Experience with Spring Boot, Experience with AWS or other cloud platforms, Experience with event-driven architectures, Hands-on experience with Typelevel ecosystem, Knowledge of Cats Effect, Strong understanding of functional programming, Experience building distributed systems, Strong knowledge of concurrency and asynchronous programming, Upper-intermediate English level 📃 Skills: Scala, Java, Spring, AWS, Kafka, Cats, Typelevel, CI/CD, Concurrency, DistributedSystems, FunctionalProgramming 🏢 Description: About us: N-iX is a software development service company that helps businesses across the globe develop successful software products. Founded in 2002 in Lviv, N-iX has come a long way and increased its presence in eight countries Poland, Ukraine, Sweden, Bulgaria, Malta, the UK, the US, and Colombia. Today, we are a strong community of 2,000+ professionals and a reliable partner for global industry leaders and Fortune 500 companies. About the client: Our customer is the European online car market with over 30 million monthly users, with a market presence in 18 countries. As a Senior Scala + Java Engineer, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers. Responsibilities Design and implement scalable backend services in Scala and Java Model complex business domains using strong type systems Build and maintain event-driven and distributed systems Contribute to architectural decisions around concurrency, streaming, and data consistency Write clean, testable, and maintainable code Improve CI/CD pipelines, observability, and system reliability Collaborate closely with product and platform teams Required Experience 4+ years of backend development experience in Scala and Java (main focus on Scala) Java Spring Boot experience Experience with Clouds, AWS preferably Familiarity with event-driven architectures (Kafka ) Hands-on experience with the Typelevel ecosystem Deep understanding of: Effect systems (Cats Effect); Functional programming principles; Type classes, higher-kinded types; Pure vs impure boundaries Experience building distributed systems Strong understanding of concurrency and asynchronous programming At least upper-intermediate English level Nice to Have Experience with Scala 3 Experience with PHP Knowledge of tagless-final patterns Experience in fintech or high-integrity domains Experience contributing to open source We offer*: Flexible working format – remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits *not applicable for freelancers

🏢 Summary: Lead Software Engineer role focused on designing and delivering scalable, secure, high-performance full-stack applications for enterprise and public sector clients. The position involves building modern frontend and backend systems, developing APIs and microservices, and supporting CI/CD, testing, and cloud environments. The role also includes technical leadership and mentoring within cross-functional teams. 🗂️ Requirements: Strong experience with JavaScript and TypeScript, Backend development experience with Node.js or Python, Experience with modern frontend frameworks, Knowledge of REST and GraphQL APIs, Experience with microservices architecture, Experience with cloud platforms (AWS, Azure, or GCP), Familiarity with CI/CD pipelines, Experience with testing frameworks, Understanding of security best practices, Understanding of performance optimization, Experience mentoring developers or leading technical initiatives 📃 Skills: JavaScript, TypeScript, Node.js, Python, React, Vue, Angular, REST, GraphQL, Microservices, AWS, Azure, GCP, CI/CD, Testing, Security, Performance 🏢 Description: International company delivering advanced internet connectivity solutions is looking for a Lead Software Engineer to help build scalable, secure, and high-performance digital products used by enterprise and public sector clients. Your responsibilities 🚀 Designing and developing modern full-stack applications Building scalable front-end solutions (React, Vue, Angular) Developing backend services and APIs (REST / GraphQL) Creating reusable components and microservices Supporting CI/CD, testing, monitoring, and automation Collaborating with Product and Design teams Mentoring engineers and supporting technical decisions Must have ✅ Strong experience with JavaScript / TypeScript Backend development experience (Node.js or Python preferred) Experience with modern frontend frameworks Knowledge of APIs, microservices, and cloud platforms (AWS, Azure, GCP) Familiarity with CI/CD and testing frameworks Understanding of security and performance best practices Experience mentoring developers or leading technical initiatives Nice to have ⭐ Experience with AI-driven tools Knowledge of design systems or distributed systems Advanced security knowledge What’s offered 🎁 International work environment Modern tech stack and large-scale systems Learning & development opportunities Competitive salary + private healthcare + pension plan Hybrid working model

🏢 Summary: Lead Software Engineer role focused on building scalable, secure, and high-performance full-stack applications for enterprise and public sector clients. The position involves designing modern frontend and backend solutions, developing APIs and microservices, and supporting cloud-based CI/CD environments. The role also includes technical leadership and mentoring while ensuring best practices in security and performance. 🗂️ Requirements: Strong experience with JavaScript, Strong experience with TypeScript, Backend development experience with Node.js or Python, Experience with modern frontend frameworks, Knowledge of APIs and microservices, Experience with cloud platforms (AWS, Azure, or GCP), Familiarity with CI/CD pipelines, Experience with testing frameworks, Understanding of security best practices, Understanding of performance optimization best practices, Experience mentoring developers or leading technical initiatives 📃 Skills: JavaScript, TypeScript, Node.js, Python, React, Vue, Angular, REST, GraphQL, Microservices, APIs, AWS, Azure, GCP, CICD, Testing, Security, Performance 🏢 Description: International company delivering advanced internet connectivity solutions is looking for a Lead Software Engineer to help build scalable, secure, and high-performance digital products used by enterprise and public sector clients. Your responsibilities 🚀 Designing and developing modern full-stack applications Building scalable front-end solutions (React, Vue, Angular) Developing backend services and APIs (REST / GraphQL) Creating reusable components and microservices Supporting CI/CD, testing, monitoring, and automation Collaborating with Product and Design teams Mentoring engineers and supporting technical decisions Must have ✅ Strong experience with JavaScript / TypeScript Backend development experience (Node.js preferred or Python) Experience with modern frontend frameworks Knowledge of APIs, microservices, and cloud platforms (AWS, Azure, GCP) Familiarity with CI/CD and testing frameworks Understanding of security and performance best practices Experience mentoring developers or leading technical initiatives Nice to have ⭐ Experience with AI-driven tools Knowledge of design systems or distributed systems Advanced security knowledge

🏢 Summary: Senior Backend Engineer role focused on building and improving a cloud-based security platform that enables large-scale forensic investigations and incident response across millions of endpoints. The position emphasizes backend development and infrastructure enhancements to increase system reliability and team velocity. You will implement backend features, integrations, and contribute to architectural decisions within a distributed environment. 🗂️ Requirements: 7+ years of backend development experience, Proficiency in Python, Experience with CI/CD systems, Experience with AWS or GCP, Experience with Terraform, Experience with relational databases, Strong understanding of backend architecture, Strong understanding of distributed systems, Upper Intermediate English level 📃 Skills: Python, AWS, GCP, Terraform, CI/CD, SQL, Java, Go, Kafka, Kubernetes, Docker 🏢 Description: N-iX is looking for a Senior Backend Engineer to join our team. Together with the client’s team, you’ll be building a next-generation cloud-based security platform as a backend engineer with strong infrastructure expertise. The team is working on products that enable security teams to orchestrate forensic investigations, run custom scripts at scale, and respond rapidly to cyber threats across millions of endpoints. The platform powers automated forensic evidence collection, customizable forensic profiles, and streamlined incident response workflows - all within a unified console alongside EDR data. This role focuses on improving infrastructure and backend systems to help the team ship faster and more reliably. Responsibilities : Drive developer experience initiatives that improve team velocity Implement backend features and integrations across multiple services Collaborate with the team on architectural decisions and code reviews Work independently while aligning with team priorities Requirements : 7+ years of backend development experience Proficiency in Python Experience with CI/CD systems, clouds (AWS/GCP) Experience with Terraform Experience with relational databases Experience with Java or Go is nice to have. Strong understanding of backend architecture and distributed systems Strong communication skills and ability to work in hybrid/remote teams Self-directed with the ability to drive initiatives independently At least Upper Intermediate English level Nice to have: Kafka and event-driven architectures E2E and integration testing strategies Kubernetes and container orchestration

🏢 Summary: Senior Backend Engineer role focused on building and improving a cloud-based security platform for large-scale forensic investigations and incident response. The position emphasizes backend development and infrastructure enhancements to enable scalable, reliable systems across millions of endpoints. You will collaborate on architecture and deliver backend features and integrations across distributed services. 🗂️ Requirements: 7+ years backend development experience, Proficiency in Python, Go, Java or similar language, Experience with CI/CD systems, Experience with AWS or GCP, Experience with Terraform, Experience with relational databases, Strong understanding of backend architecture, Strong understanding of distributed systems, Upper Intermediate English level 📃 Skills: Python, Go, Java, CI/CD, AWS, GCP, Terraform, SQL, Databases, DistributedSystems, Backend, Cloud 🏢 Description: N-iX is looking for a Senior Backend Engineer to join our team. Together with the client’s team, you’ll be building a next-generation cloud-based security platform as a backend engineer with strong infrastructure expertise. The team is working on products that enable security teams to orchestrate forensic investigations, run custom scripts at scale, and respond rapidly to cyber threats across millions of endpoints. The platform powers automated forensic evidence collection, customizable forensic profiles, and streamlined incident response workflows - all within a unified console alongside EDR data. This role focuses on improving infrastructure and backend systems to help the team ship faster and more reliably. Responsibilities : Drive developer experience initiatives that improve team velocity Implement backend features and integrations across multiple services Collaborate with the team on architectural decisions and code reviews Work independently while aligning with team priorities Requirements : 7+ years of backend development experience Proficiency in Python (preferably) , Go, Java, or any similar language Experience with CI/CD systems, clouds (AWS/GCP) Experience with Terraform Experience with relational databases Strong understanding of backend architecture and distributed systems Strong communication skills and ability to work in hybrid/remote teams Self-directed with the ability to drive initiatives independently At least Upper Intermediate English level Nice to have: Kafka and event-driven architectures E2E and integration testing strategies Kubernetes and container orchestration

🏢 Summary: Lead FullStack Engineer role focused on building and scaling high-traffic, public-facing web platforms for a large online marketplace. The position involves leveraging AI tools within the SDLC, owning end-to-end development processes, and delivering performant, production-ready solutions across frontend and backend systems. 🗂️ Requirements: 5+ years of experience building reliable, scalable, highly available systems, Strong knowledge of software architecture and design patterns, Experience applying clean code principles and coding standards, Proficiency with AI development tools and integrating them into SDLC, Experience with AI frameworks, Strong backend development experience with C# or Node.js, Strong proficiency in TypeScript, Strong experience with SQL and NoSQL databases, Strong frontend development skills (HTML, CSS, JavaScript), Experience with component-based frameworks and SSR, Experience with cloud infrastructure and containerization tools, Experience building and consuming APIs in service-based architectures, Experience with CI/CD pipelines, Experience with logging and monitoring tools, Experience with unit testing (backend and frontend), Upper-intermediate English, Availability to work in required time zones 📃 Skills: C#, Node.js, TypeScript, SQL, NoSQL, GraphQL, Redis, HTML, CSS, JavaScript, React, Next.js, Vue.js, Angular, AWS, Terraform, Docker, Git, CI/CD, Datadog, NewRelic, LangChain, Vercel, ChatGPT, Codex 🏢 Description: About the client: Our customer is the European online car market, with over 30 million monthly users and a presence in 18 countries. As a Lead FullStack Engineer, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers. Responsibilities: Developing fast, high-traffic public-facing websites Explore new technologies and help the team to use them Work using AI tools and apply them to the SDLC Following software development best practices while delivering the work Following testing principles while testing your own code to ensure production readiness Follow the philosophy of: you-build-it-you-run-it (be responsible for the SDLC processes) Requirements: 5+ years developing reliable, highly available, and scalable software systems Strong understanding of software architecture and design patterns Firm grasp of clean code principles and coding standards Strong proficiency using AI tooling , such as ChatGPT/Codex, for rapid development Experience integrating AI tooling into your development environment for streamlined usage Experience with AI Frameworks like Vercel AI SDK, LangChain, etc. Strong proficiency with backend development with C# or Node.js Strong proficiency with TypeScript Strong proficiency with SQL& NoSQL datastores (GraphQL, Redis) Strong proficiency with frontend development (HTML, CSS, JavaScript) Strong proficiency with component-based frameworks and SSR (Next.js/React or Vue.js) or Angular with the desire to learn React/ Vue.js. Hands-on experience developing and maintaining 3rd party content management systems Knowledge of modern cloud infrastructures and tools, such as AWS, Terraform, and Docker Experience with APIs and developing in a service-based application environment Experience building optimized UIs for performance Proficiency with version control systems such as Git Experience working within a formal CI/CD pipeline Experience with logging, monitoring, and alerting services like Datadog, Newrelic Solid approach to testing and ensuring quality of code, Unit testing, backend, and frontend At least Upper-intermediate English level This role requires mandatory timezone coverage: work must align with the Toronto (ET) timezone for LATAM hours and 13:00–21:00 EET for EU hours approximately. We offer*: Flexible working format - remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits *not applicable for freelancers

🏢 Summary: Senior Backend Engineer role focused on designing and delivering scalable, production-ready software using Node.js and AWS. The position involves leading development of complex solutions, ensuring high performance, reliability, and security, and integrating monitoring and testing practices. The engineer collaborates in agile teams to translate product requirements into resilient cloud-based applications. 🗂️ Requirements: Strong experience with Node.js and TypeScript, Proficiency with AWS services (Lambda, SNS/SQS, API Gateway, CDK), Experience with TDD and QA best practices, Ability to design and build highly scalable applications, Experience with monitoring, performance, scalability, and security, Experience conducting code reviews and delivering production-ready code, Ability to integrate monitoring and support tools, Experience contributing to test frameworks 📃 Skills: Node.js, TypeScript, AWS, Lambda, SNS, SQS, API Gateway, CDK, TDD, QA, Monitoring, Scalability, Security, Agile 🏢 Description: We are looking for a Senior Backend Engineer (Node.js / AWS) who: Has strong experience with TDD and solid understanding of QA best practices. Can handle operational challenges : monitoring, performance, scalability, availability, resilience, and security. Translates product requirements into reliable, scalable software . Has excellent development skills and experience building highly scalable applications . Is proficient in Node.js, TypeScript , and AWS services like Lambda, SNS/SQS, API Gateway , and CDK . What you’ll do: Lead development of complex software solutions. Conduct code reviews and deliver production-ready code . Integrate software with monitoring/support tools . Collaborate with architects and technical leads, participate in agile processes . Contribute to test frameworks , troubleshoot issues, and ensure smooth team collaboration.

🏢 Summary: Backend Engineer role focused on designing, building, and maintaining scalable backend services in a cloud-native AWS environment. The position involves developing production-grade APIs and services using TypeScript and .NET, with strong emphasis on CI/CD, Infrastructure as Code, and cloud-native best practices. The role supports secure, scalable backend systems with close collaboration across platform and operations teams. 🗂️ Requirements: Strong experience building and maintaining scalable APIs and backend services, Hands-on experience with CI/CD pipelines using GitHub Actions or GitHub Workflows, Strong development experience with TypeScript, Strong development experience with .NET (C#), Experience deploying and operating workloads in AWS Cloud, Experience using Terraform for Infrastructure as Code, Experience designing and consuming RESTful APIs or event-driven services, Understanding of cloud-native patterns, Experience with relational databases and SQL, Fluent English 📃 Skills: TypeScript, .NET, C#, AWS, Terraform, SQL, REST, CI/CD, GitHub, GitHubActions, APIs, IAM, Lambda, ECS, Fargate 🏢 Description: We are looking for a Backend Engineer to design, build, and maintain backend services in a modern cloud-native AWS environment. Core skills & experience: Strong experience as a Backend Developer, building and maintaining scalable APIs and backend services Hands-on experience with CI/CD pipelines, preferably using GitHub Actions / GitHub Workflows Strong development experience with TypeScript and .NET (C#), including building and operating production services Familiarity with AWS Cloud, including deploying and operating backend workloads in AWS Experience using Terraform for Infrastructure as Code (IaC) Related technologies / domain knowledge: Experience designing and consuming RESTful APIs and/or event-driven backend services Understanding of cloud-native patterns (stateless services, scaling, resiliency, observability) Experience working with relational databases (SQL) and backend integrations Nice-to-have / preferred experience: Experience with containerized workloads (e.g. ECS Fargate or similar) Experience with Lambda functions Familiarity with IAM and AWS security best practices Exposure to data platforms or ETL-heavy environments Experience working in environments with high operational and security requirements General expectations: Able to take ownership of backend services from development through production Comfortable working closely with platform, data, and operations engineers Focused on clean code, automation, and reliable delivery through CI/CD Used to working with SCRUM principles, preferably in JIRA Fluent English Other Details: The role is designed for a cloud-native environment, supporting development across various backend services focused on scalability and security.

🏢 Summary: Senior Backend Engineer role focused on designing and developing scalable, reliable backend services using Java. The position involves working in a cross-functional team to build high-performance systems, improve architecture, and support CI/CD and production environments. 🗂️ Requirements: 5+ years Backend Engineering experience, Strong Java proficiency, Solid knowledge of databases and SQL, Experience with RESTful APIs, Experience with microservices architecture, Experience with high-load systems, Experience with Docker and Kubernetes, Experience with AWS or GCP, Knowledge of CI/CD pipelines, Understanding of Agile practices 📃 Skills: Java, SQL, REST, Microservices, Docker, Kubernetes, AWS, GCP, CI/CD, Golang, Python 🏢 Description: We are looking for a Senior Backend Engineer with strong Java experience to help us design and develop scalable solutions. You will work in a cross-functional team, building reliable services and contributing to the continuous improvement of our systems. This role is ideal for someone who enjoys solving complex problems and driving technical excellence. 💼 Responsibilities: Design, develop, and maintain backend features and services. Collaborate with teams to define requirements and integrate systems. Ensure performance, scalability, and reliability of applications. Contribute to CI/CD processes and support production systems. Write clear documentation and share knowledge within the team. ✅ Requirements: 5+ years of experience as a Backend Engineer, with strong Java skills (Golang/Python is a plus). Solid understanding of databases and SQL. Experience with RESTful API design, microservices, and high-load systems. Familiarity with Docker, Kubernetes, and cloud environments (AWS/GCP). Knowledge of CI/CD pipelines and Agile practices. Strong problem-solving and communication skills. 🎁 We offer: Stable employment in a fast-growing company. Flexible and remote-friendly working model. Health and wellbeing benefits. Learning and development opportunities. Modern equipment and comfortable work environment.

🏢 Summary: Lead FullStack Engineer role focused on building and scaling high-traffic, public-facing web platforms for a major European online marketplace. The position involves full SDLC ownership, AI-assisted development, and delivering highly available, performance-optimized solutions using modern cloud and frontend technologies. Work includes backend and frontend development, cloud infrastructure, CI/CD, and integration of AI frameworks into the development workflow. 🗂️ Requirements: 5+ years of experience building reliable, scalable software systems, Strong knowledge of software architecture and design patterns, Proficiency in C# and TypeScript, Strong experience with SQL and NoSQL databases, Strong frontend development experience (HTML, CSS, JavaScript), Experience with React, Next.js, Vue.js or Angular, Experience with AI tools (ChatGPT, Codex) in development workflows, Experience with AI frameworks (Vercel AI SDK, LangChain), Experience with AWS, Terraform, Docker, Experience building and consuming APIs in service-based architectures, Experience with CI/CD pipelines, Experience with logging and monitoring tools (Datadog, NewRelic), Strong unit testing skills (backend and frontend), Experience with Git, Upper-intermediate English, Availability to work in required time zone (ET or 13:00–21:00 EET) 📃 Skills: C#, TypeScript, SQL, NoSQL, GraphQL, Redis, HTML, CSS, JavaScript, React, Next.js, Vue.js, Angular, ChatGPT, Codex, LangChain, Vercel, AWS, Terraform, Docker, Git, CI/CD, Datadog, NewRelic 🏢 Description: Аbout us: N-iX i s a software development service company that helps businesses across the globe develop successful software products. Founded in 2002 in Lviv, N-iX has come a long way and increased its presence in eight countries Poland, Ukraine, Sweden, Bulgaria, Malta, the UK, the US, and Colombia. Today, we are a strong community of 2,000+ professionals and a reliable partner for global industry leaders and Fortune 500 companies. About the client: Our customer is the European online car market, with over 30 million monthly users and a presence in 18 countries. As a Lead FullStack Engineer, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers. Responsibilities: Developing fast, high-traffic public-facing websites Explore new technologies and help the team to use them Work using AI tools and apply them to the SDLC Following software development best practices while delivering the work Following testing principles while testing your own code to ensure production readiness Follow the philosophy of: you-build-it-you-run-it (be responsible for the SDLC processes) Requirements: 5+ years developing reliable, highly available, and scalable software systems Strong understanding of software architecture and design patterns Firm grasp of clean code principles and coding standards Strong proficiency using AI tooling, such as ChatGPT/Codex, for rapid development Experience integrating AI tooling into your development environment for streamlined usage Experience with AI Frameworks like Vercel AI SDK, LangChain, etc. Strong proficiency with the following technologies: C#+Typescript Strong proficiency with SQL & NoSQL datastores (GraphQL, Redis) Strong proficiency with frontend development (HTML, CSS, JavaScript) Strong proficiency with component-based frameworks and SSR (Next.js/React or Vue.js) or Angular with the desire to learn React/ Vue.js. Hands-on experience developing and maintaining 3rd party content management systems Knowledge of modern cloud infrastructures and tools, such as AWS, Terraform, and Docker Experience with APIs and developing in a service-based application environment Experience building optimized UIs for performance Proficiency with version control systems such as Git Experience working within a formal CI/CD pipeline Experience with logging, monitoring, and alerting services like Datadog, Newrelic Solid approach to testing and ensuring quality of code, Unit testing, backend, and frontend At least Upper-intermediate English level This role requires mandatory timezone coverage: work must align with the Toronto (ET) timezone for LATAM hours and 13:00–21:00 EET for EU hours approximately. We offer*: Flexible working format - remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits *not applicable for freelancers