Senior .Net Developer

🏢 Summary: Senior .NET Developer role focused on building scalable, cloud-native platforms for intelligent heating and energy management systems in the smart building industry. The position involves developing event-driven services, cloud infrastructure, and user-facing applications supporting distributed energy devices. The project centers on sustainable, efficient heating and cooling solutions. 🗂️ Requirements: Minimum 5 years experience with C# and .NET, Experience with Azure cloud ecosystem, Experience with MongoDB, Experience with event-driven architecture, English proficiency at B2 level or higher, Ability to work independently and in cross-functional team 📃 Skills: C#, .NET, Azure, MongoDB, PostgreSQL, Kafka, Kubernetes, React, TypeScript, Python, Microservices 🏢 Description: Salary: 1000 - 1500 PLN/MD + VAT Remote: flexible hybrid from Gdynia / Kraków / Warszawa / Rzeszów Why choose this offer? You will have the opportunity to develop and improve a software tool which helps provide customers all over the world with tailor-made heating and cooling solutions Your work will help create more sustainable, cost-efficient and environment friendly heating and cooling solutions The Jit community will bring you a nice time during regular integration meetings Project We are looking for experienced Senior .Net Developer who will be part of a team developing modern software solutions for the energy and smart building industry, focused on intelligent heating and hot water management systems. The project involves building scalable cloud-native platforms that support monitoring, optimization, and automation of distributed energy devices used in residential and commercial environments. You’ll work closely with backend, frontend, and platform engineers to design and develop event-driven services, cloud infrastructure, and user-facing applications. Expected competences and knowledge Strong experience with C# / .NET - min. 5 years of experience Knowledge of Azure cloud ecosystem Experience with MongoDB Experience with event-driven architecture English proficiency at a minimum B2 level Ability to work independently and as part of a cross-functional engineering team Nice to have : Experience with Kafka Experience with Kubernetes Familiarity with React / TypeScript Familiarity with PostgreSQL Experience with migration and platform transformation projects Technologies you'll work with C# / .NET Azure Cloud React, TypeScript MongoDB, PostgreSQL Kafka Python Kubernetes Event-driven microservices architecture Client – why choose this particular client from the Jit portfolio? Our Client engineers technologies that enable the world of tomorrow to do more with less. They meet the growing need for infrastructure, food supply, energy efficiency and climate-friendly solutions . Their products and services are used in areas such as refrigeration, air conditioning, heating, motor control and mobile machinery. They are also active in the field of renewable energy as well as district heating infrastructure for cities and urban communities. Their innovative engineering dates back to 1933 and today our Client is a world-leader , employing more than 27,000 employees and serving customers in more than 100 countries . They are still privately held by the founding family. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: Senior .NET Developer role in a data-intensive, cloud-native project for intelligent heating and energy management systems. The position focuses on building scalable analytics platforms, event-driven services, and real-time data processing solutions in a distributed environment. Fully remote or hybrid work with modern technologies in the energy and smart building domain. 🗂️ Requirements: Minimum 5 years commercial experience with C# and .NET, Strong Python skills in data engineering, ETL, and analytics, Experience with Apache Iceberg and modern data platforms, Hands-on experience with Kubernetes, Basic knowledge of Azure Cloud, Strong practical experience with PostgreSQL, Hands-on experience with Kafka, Experience with event-driven architecture and asynchronous messaging systems, Experience with time-series databases, Experience with React and TypeScript, Knowledge of advanced authorization systems such as ReBAC or SpiceDB, English proficiency at B2 level or higher 📃 Skills: C#, .NET, Python, Kafka, Iceberg, PostgreSQL, GreptimeDB, Kubernetes, Azure, React, TypeScript, SpiceDB, ReBAC, NATS 🏢 Description: Salary: 1000 - 1280 PLN/MD + VAT Remote: flexible hybrid from Gdynia / Kraków / Warszawa / Rzeszów Why choose this offer? You will have the opportunity to develop and improve a software tool which helps provide customers all over the world with tailor-made heating and cooling solutions Your work will help create more sustainable, cost-efficient and environment friendly heating and cooling solutions The Jit community will bring you a nice time during regular integration meetings Project We are looking for experienced Senior .Net Developer who will be part of a team developing modern software solutions for the energy and smart building industry, focused on intelligent heating and hot water management systems. You will join a team building modern data-intensive and cloud-native software platforms focused on scalable analytics, distributed event processing, and real-time operational insights. You’ll work closely with backend, frontend, and platform engineers to design and develop event-driven services, cloud infrastructure, and user-facing applications. Expected competences and knowledge Strong experience with C# / .NET – min. 5 years of commercial experience Strong Python skills focused on data engineering, analytics, ETL, and data processing Experience with Apache Iceberg and modern data platform ecosystems Hands-on experience with Kubernetes and basic Azure cloud knowledge Strong practical experience with PostgreSQL Hands-on experience with Kafka Experience with event-driven architecture and asynchronous messaging systems (Kafka / NATS during transition period) Experience with GreptimeDB or other time-series databases React / TypeScript skills Experience with ReBAC / SpiceDB or advanced authorization systems English proficiency at a minimum B2 level Ability to work independently and as part of a cross-functional engineering team Nice to have : Experience with migration and platform transformation projects Experience designing and developing cloud-native architectures Technologies you'll work with C# / .NET Python Apache Kafka Apache Iceberg PostgreSQL GreptimeDB / Time-series databases React, TypeScript Kubernetes Azure Cloud SpiceDB / ReBAC Event-driven microservices architecture Client – why choose this particular client from the Jit portfolio? Our Client engineers technologies that enable the world of tomorrow to do more with less. They meet the growing need for infrastructure, food supply, energy efficiency and climate-friendly solutions . Their products and services are used in areas such as refrigeration, air conditioning, heating, motor control and mobile machinery. They are also active in the field of renewable energy as well as district heating infrastructure for cities and urban communities. Their innovative engineering dates back to 1933 and today our Client is a world-leader , employing more than 27,000 employees and serving customers in more than 100 countries . They are still privately held by the founding family. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: Senior .NET Developer role focused on building cloud-native, data-intensive platforms for intelligent heating and energy management systems. The position involves developing scalable event-driven services, real-time analytics solutions, and distributed systems in a modern cloud environment. You will collaborate with cross-functional teams to design and deliver robust backend and cloud infrastructure components. 🗂️ Requirements: Minimum 5 years commercial experience with C# and .NET, Hands-on experience with Kubernetes, Basic knowledge of Azure cloud, Strong practical experience with PostgreSQL, Experience with event-driven architecture, Experience with asynchronous messaging systems, English proficiency at B2 level or higher, Ability to work independently and in cross-functional teams 📃 Skills: C#, .NET, Kubernetes, Azure, PostgreSQL, Kafka, Python, React, TypeScript, Iceberg, GreptimeDB, SpiceDB 🏢 Description: Salary: 1000 - 1500 PLN/MD + VAT Remote: flexible hybrid from Gdynia / Kraków / Warszawa / Rzeszów Why choose this offer? You will have the opportunity to develop and improve a software tool which helps provide customers all over the world with tailor-made heating and cooling solutions Your work will help create more sustainable, cost-efficient and environment friendly heating and cooling solutions The Jit community will bring you a nice time during regular integration meetings Project We are looking for experienced Senior .Net Developer who will be part of a team developing modern software solutions for the energy and smart building industry, focused on intelligent heating and hot water management systems. You will join a team building modern data-intensive and cloud-native software platforms focused on scalable analytics, distributed event processing, and real-time operational insights. You’ll work closely with backend, frontend, and platform engineers to design and develop event-driven services, cloud infrastructure, and user-facing applications. Expected competences and knowledge Strong experience with C# / .NET – min. 5 years of commercial experience Hands-on experience with Kubernetes and basic Azure cloud knowledge Experience with Python Strong practical experience with PostgreSQL Experience with event-driven architecture and asynchronous messaging systems English proficiency at a minimum B2 level Ability to work independently and as part of a cross-functional engineering team Nice to have : Experience with migration and platform transformation projects React / TypeScript skills Python skills focused on data engineering, analytics, ETL, and data processing Hands-on experience with Kafka Experience with modern data platform ecosystems Experience designing and developing cloud-native architectures Technologies you'll work with C# / .NET Python Apache Kafka Apache Iceberg PostgreSQL GreptimeDB / Time-series databases React, TypeScript Kubernetes Azure Cloud SpiceDB / ReBAC Event-driven microservices architecture Client – why choose this particular client from the Jit portfolio? Our Client engineers technologies that enable the world of tomorrow to do more with less. They meet the growing need for infrastructure, food supply, energy efficiency and climate-friendly solutions . Their products and services are used in areas such as refrigeration, air conditioning, heating, motor control and mobile machinery. They are also active in the field of renewable energy as well as district heating infrastructure for cities and urban communities. Their innovative engineering dates back to 1933 and today our Client is a world-leader , employing more than 27,000 employees and serving customers in more than 100 countries . They are still privately held by the founding family. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: Full Stack Developer role focused on building and modernizing a cloud-based SaaS platform in Microsoft Azure for managing and optimizing district heating and energy systems. The position involves end-to-end development across Node.js backend services and React frontend applications, working with real-time data, integrations, and distributed cloud environments. The offer includes ownership of features from development to production in a quality-driven, Agile team. 🗂️ Requirements: Minimum 3 years commercial experience as Full Stack Developer, Strong experience with Node.js and TypeScript, Strong experience with React and TypeScript, Experience building and maintaining REST APIs, Experience with MySQL and MongoDB, Experience with InfluxDB, Experience with automated unit and integration testing, Experience with Git and pull request workflows, Ability to work within large existing codebases, Understanding of safe data operations and data integrity, Experience working in Agile/Scrum environments, Good written and spoken English 📃 Skills: Node.js, TypeScript, React, REST, MySQL, MongoDB, InfluxDB, MQTT, Docker, Kubernetes, Azure, AzureDevOps, CI/CD, YAML, Grafana, Sentry, Cypress, Git, pnpm 🏢 Description: Salary: 700 - 850 PLN/MD on B2B Work model: hybrid from Gdańsk / Warszawa / Kraków / Rzeszów Why choose this offer? Work on a modern SaaS platform hosted in the cloud (including Microsoft Azure), used to manage and optimize district heating and energy systems Join a distributed team working across the full technology stack, from backend services to frontend applications Take ownership of features from development through production deployment Work in an environment that values automated testing, code quality, and peer code reviews Contribute to a platform with a real-world impact on energy efficiency and operational optimization Project The project is a cloud-based SaaS platform hosted in Microsoft Azure that supports the management and optimization of district heating networks, heating substations, and other components of heating infrastructure. The application collects and processes data from meters, sensors, network measurements, and controllers, enabling remote monitoring, configuration, and control of connected devices. It provides real-time and historical analysis of energy consumption and operational parameters , along with reporting, alerting, dashboards, maps, and data visualizations that help operators efficiently oversee entire heating networks. The platform also integrates with external data sources, such as weather forecasts and optimization systems, to improve operational efficiency and decision-making. The successful candidate will initially focus on modernizing and improving internal tools before moving into feature development and platform-related initiatives. The role involves broad full-stack development across Node.js backend services and React-based frontend applications, working within a large, established codebase and contributing to solutions used in a distributed, cloud-native environment. Expected competences and knowledge Minimum 3 years of commercial experience as a Full Stack Developer working with Node.js, TypeScript and React Strong experience with Node.js and TypeScrip t for building and maintaining backend services and REST APIs Strong experience with React and TypeScript , including modern hooks-based development and component design Experience working with MySQL, MongoDB, and ideally InfluxDB , with a solid understanding of data modelling, querying, performance optimization, and maintaining data integrity across relational and document databases Ability to work effectively within a large existing codebase, following established patterns and safely extending applications and services built by other engineers Practical experience with automated testing , including unit and integration testing as a standard part of the development process Experience working with Git and pull request-based workflows , including participating in code reviews and providing constructive feedback Understanding of safe and reliable data operations , including idempotency, handling partial failures, and minimizing risks associated with data modifications Good written and spoken English skills , enabling effective collaboration within a distributed, international team Experience working in Agile/Scrum environments , including estimation, stand-ups, sprint planning, and sprint commitments Proactive, self-organized approach to work , with the ability to identify and communicate blockers early Strong ownership mindset and accountability for delivering features from development through production Nice to have: Experience with microservices and event-driven architectures, including message brokers, queues, and pub/sub patterns Familiarity with MQTT and systems processing telemetry or IoT device data Experience with Docker and basic knowledge of Kubernetes Experience working in monorepo environments and with pnpm workflows Familiarity with Microsoft Azure and Azure DevOps CI/CD pipelines Understanding of observability concepts, including logs, metrics, and traces, with tools such as Grafana and Sentry Experience with Cypress or other end-to-end testing frameworks Experience with event sourcing architectures Knowledge of IoT, industrial protocols, or domains such as energy management, district heating, building management systems, or smart infrastructure solutions Technologies you'll work with Node.js TypeScript React REST APIs MySQL MongoDB InfluxDB MQTT Job Queues Docker Kubernetes pnpm Monorepo Architecture Microsoft Azure Azure DevOps CI/CD Pipelines (YAML) Grafana Sentry Cypress Git Automated Testing (Unit, Integration, E2E) Client – why choose this particular client from the Jit portfolio? Our Client engineers technologies that enable the world of tomorrow to do more with less. They meet the growing need for infrastructure, food supply, energy efficiency and climate-friendly solutions . Their products and services are used in areas such as refrigeration, air conditioning, heating, motor control and mobile machinery. They are also active in the field of renewable energy as well as district heating infrastructure for cities and urban communities. Their innovative engineering dates back to 1933 and today our Client is a world-leader , employing more than 27,000 employees and serving customers in more than 100 countries . They are still privately held by the founding family. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: Senior .NET Developer role focused on designing and maintaining scalable backend services and microservice-based solutions for a European energy trading platform. The position involves building high-performance APIs, integrating messaging systems, and contributing to CI/CD automation in a hybrid work model. The offer includes collaboration with experienced specialists and work with modern technologies. 🗂️ Requirements: 10+ years experience with C# and .NET, Strong experience with SQL databases, Experience with microservices architecture, Experience with messaging systems (RabbitMQ or Kafka), Experience with CI/CD tools (GitHub, GitHub Actions, Octopus Deploy or similar), Ability to design and maintain backend services and APIs, Experience in performance optimization and troubleshooting 📃 Skills: C#, .NET, SQL, RabbitMQ, Kafka, GitHub, GitHubActions, OctopusDeploy, Azure, Angular, Kubernetes, Orleans, CI/CD, Microservices 🏢 Description: Salary: 1000 - 1300 PLN/MD on B2B Work model: elastic hybrid from Gdańsk / Warsaw / Kraków / Rzeszów (1 day from the office a week) Why choose this offer? Working for a leading European energy exchange Collaboration with a team of specialists to create innovative solutions using the latest technologies You can expect a flexible work organization The Jit community will bring you a nice time during regular integration meetings Project We're seeking a Senior .NET Developer who will join our client. Responsibilities you'll have Design, develop, and maintain backend services and APIs using C# and .NET Build and enhance scalable microservice-based solutions Develop and optimize SQL database integrations and data processing workflows Implement and maintain messaging solutions using RabbitMQ, Kafka, or similar technologies Contribute to CI/CD pipelines and deployment automation Collaborate with cross-functional teams to deliver high-quality software solutions Participate in code reviews , architecture discussions, and technical decision-making Monitor, troubleshoot, and improve application performance , scalability, and reliability Expected competences and knowledge Experienced C# .NET developer (ideally 10+ yrs), with experience of SQL databases Experience with microservices and messaging infra (RabbitMQ & Kafka or similar) Experience in CI/CD tools such as GitHub, GitHub Actions, Octopus Deploy or similar What we consider a plus Fintech experience Frontend experience (Angular or similar) Experience using Microsoft Azure platform and infrastructure services Some prior experience or knowledge about containerization and container orchestration (Kubernetes) Experience of implementing high-load and scalable applications using the Actor Model (Orleans) Technologies you'll work with C# .NET SQL Azure Messaging solutions CI/CD tools Angular Kubernetes Client – why choose this particular client from the Jit portfolio? Our client is the leading European power market company which delivers efficient, simple, and secure trading across Europe . In 2023 they celebrate 30 years of powering the market. The company offers day-ahead and intraday trading, clearing and settlement, and additional services to customers, regardless of size or location. Currently, 360 traders from 20 countries operate on their markets. The company provides services on markets in the Nordic and Baltic regions, Germany, Poland, France, the Netherlands, Belgium, Austria, Luxembourg, and the UK. Our client is a Nominated Electricity Market Operator (NEMO) in 15 European countries, while also servicing power markets in Bulgaria, Croatia, and Georgia . In 2021 they had a total traded power turnover of 963 TWh. Our client has three decades of power market experience built on offering flexibility, transparency, innovation, greater choice, and opportunities on the electricity market. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: B2B .NET Developer role focused on developing and maintaining a web-based platform hosted in Azure, including building new features and integrating third-party APIs. The position involves working in a small, independent team delivering increments in short cycles with CI/CD practices. Hybrid work model with one day per week in the office. 🗂️ Requirements: Minimum 2 years experience in web application development, Experience with C# and .NET, Experience with Azure, Experience with AzureFunctions, Experience integrating third-party APIs, Knowledge of CI/CD pipelines, Experience with AzureDevOps 📃 Skills: C#, .NET, Azure, AzureFunctions, AzureDevOps, CI/CD, APIs, Web 🏢 Description: Salary: 500 - 900 PLN / day (B2B) Remote: Hybrid from Gdańsk or Warsaw (1 day from office per week) Why choose this offer? You can expect a flexible work organization The international work environment will give you the opportunity to interact with the English language on a daily basis The Jit community will bring you a nice time during regular integration meetings Project We are looking for a .NET Developer to join our team to develop new functionalities and maintain our Client's web-based platform hosted in Azure. The tasks will include expanding the platform as well as integrating with third-party APIs. We offer work in an independent team focused on delivering value to the Clients in short cycles. Responsibilities you'll have Design, develop, and maintain software using C# Effectively communicate in an English-speaking environment Build and deploy code using CI/CD pipelines Expected competences and knowledge Minimum 2 years of experience in developing web applications Experience in working with Azure, especially Azure Functions and Azure Experience in integrating with third-party APIs Great communications skills Willingness to propose improvements and new solutions Knowledge of CI/DD pipelines in Azure DevOps is a plus Technologies you'll work with .Net Azure API Client – why choose this particular client from the Jit portfolio? Our client is a pioneering Norwegian startup specializing in shore power and energy infrastructure optimization. They transform manual and error-prone operations into automated, accurate, and seamless experiences. With their solutions, ports can automate processes to reduce manual errors, monitor real-time energy consumption, and centralize the management of power connections and billing. This comprehensive approach enhances operational efficiency and reduces costs, positioning our client as an innovative partner in the maritime sector. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: Remote Senior .NET Engineer role focused on developing, optimizing, and maintaining enterprise applications built on ASP.NET, .NET Core, and .NET Framework. The position involves performance tuning, database optimization, production troubleshooting, and contributing within a cross-functional agile team. Strong emphasis on system reliability, CI/CD practices, and collaboration in an English-speaking environment. 🗂️ Requirements: Bachelor’s degree in Computer Science or related field, Strong experience with .NET technologies (ASP.NET, .NET Core, .NET Framework), Solid experience with MSSQL databases and SQL, Experience with stored procedures and query optimization, Proven experience in debugging and performance optimization, Experience troubleshooting production systems, Familiarity with CI/CD tools (Jenkins, TeamCity, or Azure DevOps), Ability to work in cross-functional agile teams, Strong English communication skills 📃 Skills: C#, .NET, ASP.NET, MSSQL, SQL, StoredProcedures, Jenkins, TeamCity, AzureDevOps, CICD, Debugging, Performance, Git, DevOps 🏢 Description: Salary: up to 1300 PLN/MD on B2B Work model: remote Why choose this offer? Work in an agile and self-sufficient team with autonomy over development Collaborate with an English-speaking, multicultural team The client is one of the European leaders in its field and is building a completely new platform using the latest technologies The Jit community will bring you a nice time during regular integration meetings Enjoy work-life balance in a company that values flexibility and innovation Project We are looking for a highly skilled Senior .NET Engineer to join our dynamic team. In this role, you will focus on developing, improving, maintaining, troubleshooting, and optimizing applications built with ASP.NET, .NET Core, and .NET Framework. Your expertise in MSSQL databases, debugging, and performance improvement will be crucial in ensuring smooth system operations. Our teams follow a T-shaped, cross-functional setup , meaning engineers contribute beyond their primary expertise. You should be comfortable taking on small tasks in different areas , including bug fixes, PR reviews, or DevOps contributions . We value collaboration and adaptability over rigid role definitions. What you'll be doing Develop, improve, maintain and support applications developed in ASP.NET, .NET Core, and .NET Framework Identify and resolve software and database performance issues Optimize SQL queries and stored procedures to improve system efficiency Collaborate with cross-functional teams to debug and resolve production issues Implement performance improvements and ensure application reliability Work with build and deployment tools (e.g., Jenkins, TeamCity, Azure DevOps) Communicate progress and technical updates to stakeholders and team members Expected competences and knowledge Bachelor's degree in Computer Science, Engineering, or a related field Strong development experience in .NET technologies (ASP.NET, .NET Core, .NET Framework) Expertise in troubleshooting production system issues Solid experience with MSSQL databases, SQL, and stored procedures A proactive, problem-solving mindset Previous experience in debugging and performance optimization Familiarity with CI/CD tools such as Jenkins, TeamCity, or Azure DevOps Strong communication skills to interact with both technical and non-technical stakeholders Technologies you'll work with .NET Framework, .NET Core, ASP.NET MSSQL CI/CD Tools Debugging & Performance Optimization Version Control DevOps Contributions Client – why choose this particular client from the Jit portfolio? Our client is a Scandinavian supplier of software and services for purchasing and tendering processes in highly formalized conditions, such as orders in accordance with public procurement law at the level of the European Union or individual member states. The delivery center is located in Utrecht. Client’s platforms allow to announce tenders and conduct the entire procedure of collecting and evaluating offers at every stage of the purchasing process. They are used both by public administration bodies at various levels in European countries and by purchasing departments of large companies and corporations. About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 500 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy.

🏢 Summary: Remote B2B role focused on designing and implementing a new integration layer between BAM services and the PowerBid system, replacing the existing Exchange Tool. The position involves developing interfaces, ensuring system compatibility, and executing cutover and rollback strategies in an international energy market environment. You will work with modern backend and container technologies while influencing technical solutions. 🗂️ Requirements: Strong experience with Java, Strong experience with Spring Boot, Strong experience with Kotlin, Experience with Docker, Experience with Kubernetes, Experience with Kafka, Experience with PostgreSQL, Experience with Rich Client applications, Degree in Computer Science or related field, Knowledge of requirement engineering, Fluent English 📃 Skills: Java, SpringBoot, Kotlin, Kafka, Kubernetes, Docker, PostgreSQL, JavaScript, TypeScript, Angular 🏢 Description: Salary: 1000 - 1300 PLN/MD on B2B Work model: Remote Availability: ASAP or within 14 days preferred Why choose this offer? You will work in an international environment , collaborating with teams and stakeholders from different countries. Opportunity to take ownership of the development process and influence the technological direction of the solutions you build. The energy market is in an exciting transition , moving away from fossil fuels towards decentral solutions, renewables, and energy efficiency Project The project focuses on implementing a new integration layer between existing BAM services and the PowerBid system , replacing the current Exchange Tool. It includes designing and developing interfaces/adapters, ensuring system compatibility, and delivering full technical documentation. The work also involves defining and executing a cutover and rollback strategy to ensure a smooth transition. Expected competences and knowledge Strong experience with Java, Spring Boot, and Kotlin Hands-on experience with JavaScript/TypeScript and Angular (nice to have) Experience with Docker and Kubernetes Familiarity with Kafka and Postgres Experience with Rich Client applications Basic knowledge of the energy market in Germany and the Netherlands Degree in Computer Science or a related field Knowledge of requirement engineering Strong communication skills and ability to work independently Fluent English (German is a plus) Technologies you'll work with Java Spring Boot Kotlin Kafka Kubernetes Docker PostgreSQL JavaScript / TypeScript Angular Client – why choose this particular client from the Jit portfolio? Jit Team is cooperating with European energy company with approximately 20 000 employees. For more than 100 years, they have electrified industries, supplied energy to people’s homes and modernized way of living through innovation and cooperation. The purpose is to make fossil-free living possible within one generation . To be able to reach this ambitious goal we are looking for talented individuals who, in addition to their passion for their own role, also have strong team spirit and want to contribute to supporting a meaningful corporate mission. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts, to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

🏢 Summary: Hybrid developer role focused on transforming the software development lifecycle through active use of AI tools and agents across real production projects. The position combines hands-on development (Java/.NET/frontend/cloud) with driving AI adoption, automation, and process optimization within teams. The role involves building internal AI-based solutions and scaling AI-supported SDLC practices organization-wide. 🗂️ Requirements: Active software developer, Strong expertise in Java or .NET or frontend ecosystem, Active daily use of AI tools in development workflow, Understanding of full SDLC from analysis to production, Ability to demonstrate measurable impact of work, Willingness to work in hybrid model 📃 Skills: Java, .NET, Frontend, Cloud, AI, Claude, Copilot, Cursor, Playwright, SDLC, Automation 🏢 Description: Salary: 1000-1300 PLN net / MD Hybrid work: we expect a positive attitude toward working in a hybrid model . We can hire in any of our locations (Gdynia/Gdańsk, Warsaw, Rzeszów, Kraków) . Why choose this offer? A strong impact on how the entire organization works Work on real projects (not just POCs) More about this offer We are looking for a proactive developer who will help us transform the way we build software . We are creating an environment where most of the SDLC (analysis, UX, code, testing, documentation) is supported by AI (Claude Code, agents, automations). We already have teams working in this model — now we want to scale this approach across the entire organization. Requirements Active developer Strong expertise in one of the following ecosystems: Java / .NET / frontend - we expect any level of experience with these technologies Active use of AI in daily work (not just ChatGPT for “assistance”) Understanding of the SDLC end-to-end (analysis → production) Enjoyment of working with people and driving changes in how they operate Ability to demonstrate concrete impact: “I did X → result Y” Nice to have skills Experience with AI agents (e.g. Claude Code, Cursor, Copilot, etc.) Test automation experience (e.g. Playwright) Experience in measuring team productivity Experience in building internal tools / platforms Duties Work as a developer (Java / .NET / frontend / cloud) Build internal AI-based solutions (agents, workflows, automations) Join teams and help them change the way they work: demonstrate how to use AI in daily tasks, support the implementation of specific practices (code, testing, analysis, UX) Measure effectiveness (time, quality, throughput) Report the level of AI adoption in teams (usage, impact, maturity) Create and maintain standards for working with AI (prompting, agents, memory, workflows) Share knowledge and help build an internal community About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy.

🏢 Summary: The offer is for a proactive developer who will help scale an AI-driven software development model across the organization, combining hands-on coding with transformation initiatives. The role involves building AI-based internal tools and supporting teams in adopting AI across the full SDLC. You will work on real production projects while driving measurable improvements in efficiency and quality. 🗂️ Requirements: Active developer, Strong expertise in Java or .NET or frontend, Practical use of AI tools in daily development work, Understanding of full SDLC lifecycle, Ability to demonstrate measurable impact of delivered solutions, Willingness to work in hybrid model 📃 Skills: Java, .NET, Frontend, Cloud, AI, SDLC, Claude, Copilot, Playwright, Automation 🏢 Description: Salary: 1000-1300 PLN net / MD Hybrid work: we expect a positive attitude toward working in a hybrid model . We can hire in any of our locations (Gdynia/Gdańsk, Warsaw, Rzeszów, Kraków) . Why choose this offer? A strong impact on how the entire organization works Work on real projects (not just POCs) More about this offer We are looking for a proactive developer who will help us transform the way we build software . We are creating an environment where most of the SDLC (analysis, UX, code, testing, documentation) is supported by AI (Claude Code, agents, automations). We already have teams working in this model — now we want to scale this approach across the entire organization. Requirements Active developer Strong expertise in one of the following ecosystems: Java / .NET / frontend - we expect any level of experience with these technologies Active use of AI in daily work (not just ChatGPT for “assistance”) Understanding of the SDLC end-to-end (analysis → production) Enjoyment of working with people and driving changes in how they operate Ability to demonstrate concrete impact: “I did X → result Y” Nice to have skills Experience with AI agents (e.g. Claude Code, Cursor, Copilot, etc.) Test automation experience (e.g. Playwright) Experience in measuring team productivity Experience in building internal tools / platforms Duties Work as a developer (Java / .NET / frontend / cloud) Build internal AI-based solutions (agents, workflows, automations) Join teams and help them change the way they work: demonstrate how to use AI in daily tasks, support the implementation of specific practices (code, testing, analysis, UX) Measure effectiveness (time, quality, throughput) Report the level of AI adoption in teams (usage, impact, maturity) Create and maintain standards for working with AI (prompting, agents, memory, workflows) Share knowledge and help build an internal community About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy. Apply