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About:
We are looking for a Senior Backend Engineer (.NET) to join a healthcare project focused on building a Connected Device Data Platform that ingests biometric data (pulse, heart rate, O2, steps, accelerometer) from smartwatch wearable devices via AWS IoT Core and delivers it to a companion mobile app.

This is a hands-on senior role requiring strong autonomy, ownership of a .NET Core codebase, and experience working with AWS cloud-native services.

This position provides the possibility of business trips (EU, USA) and occasional visits to the Lviv office when needed.

What We’re Looking For:

• 5+ years of backend development experience with .NET Core / C#
• Strong experience designing and building REST APIs with ASP.NET Core
• Solid PostgreSQL skills (data modeling, query optimization, migrations)
• Hands-on experience with AWS services: Lambda, S3, RDS, CloudWatch, SNS/SQS, Cognito
• Experience with event-driven/message-based architectures (Amazon MSK / Kafka or similar)
• Experience with microservices architecture and serverless patterns (AWS Lambda)
• Working knowledge of Docker/Kubernetes (AWS EKS)
• Experience integrating third-party notification services (Twilio, Firebase, or similar)
• Ability to read and analyze unfamiliar codebases, including Java, to understand integration points
• Good English communication skills for daily interaction with PM and cross-team coordination

• Experience working in Agile/Scrum environments (planning, backlog grooming, demos)

   

Your Responsibilities:

• Own and evolve the Lifeline Connect REST API (.NET Core) serving the Flutter mobile app
• Manage and extend PostgreSQL data models for patient/device data, biometric records, user management, and alarm events
• Build the alarm/notification service using AWS Lambda and Amazon MSK (Kafka), delivering notifications via Twilio and Firebase
• Develop and maintain the IoT data enrichment pipeline, processing MQTTS device data and persisting it to InfluxDB and PostgreSQL
• Integrate authentication and user management using Amazon Cognito
• Contribute to building the IoT Device Manager for registration and provisioning via AWS IoT Core
• Analyze incoming Java code deliveries from the hardware team to understand device-side logic and integration points
• Implement integrations with third-party monitoring services and healthcare providers
• Prepare the platform for AWS HealthLake (FHIR) integration
• Participate in 2–3 week sprint cycles, communicating technical decisions and assessments
• Maintain technical documentation, API specifications, and architecture documentation
• Contribute to HIPAA compliance foundations (encryption, access control, audit trails)

• Support future AI/ML-driven features (anomaly detection, predictive analytics) and new IoT device integrations

   

Will Be a Plus:

• Experience with healthcare platforms, biometric data processing, or HIPAA/GDPR compliance
• Familiarity with time-series databases (InfluxDB, AWS Timestream)
• Experience with Amazon Cognito or similar authentication systems (OAuth 2.0, user pools)
• Experience with FHIR standards or AWS HealthLake
• Experience integrating AI/ML services (anomaly detection, predictive analytics)

Join CoreWillSoft GmbH and help build Windows-based software that protects critical facilities and infrastructure. We develop innovative physical security and access control solutions, integrating building automation, IoT devices, and high-security hardware. 

You’ll join an Agile, international team distributed across locations, with our headquarters in Bonn, Germany. We own the full product lifecycle — from discovery and implementation to release and operation — so your work will be visible, impactful, and close to real customer needs. 

What you`ll do: 

• Develop, maintain, and enhance Windows-based desktop applications using .Net. 
• Maintain and develop DLLs written in C++. 
• Implement CI/CD pipelines for development and QA processes. 
• Act as a liaison between the customer and the development team, collecting and synthesizing feedback into actionable tasks. 
• Ensure on-time delivery of high-quality products. 
• Collaborate with cross-functional teams, including engineering, sales, marketing, and support, to deliver successful projects. 
• Identify potential risks and issues within the project and propose mitigation strategies. 

What we offer: 

• Meaningful Impact: Build solutions that are used every day by thousands of businesses — your work will directly improve real-world security and connected device experiences. 
• Product & Process Ownership: Help shape not only the product, but also how we build and deliver it — your ideas and decisions will have visible impact. 
• Industry Influence: Contribute to key security standards and best practices, staying ahead of the curve in a fast-evolving industry. 
• Modern Tech Stack & Hardware: Work with the latest hardware and the tools you need to do your best work. 
• Time Off & Flexibility: 20 vacation days, paid sick leave, and public holidays in line with German legislation — plus flexibility built around outcomes, not micromanagement. 
• Learning & Development Budget: We support continuous growth by covering hard and soft skills courses, trainings, and access to e-learning platforms. 
• Coworking Support: Prefer not to work from home every day? We offer coworking compensation so you can choose the environment that fits you best. 
• Language Learning Support: Monthly fixed compensation you can use to improve your English or German through the learning format of your choice. 
• Strong Team Culture: Open collaboration, a flat structure, and thoughtful onboarding—your voice is heard, and you can make an impact from day one. 

What you bring: 

• Proven experience in Windows .Net Desktop application development. 
• Familiarity with System.Reactive and its extensions for reactive programming. 
• Experience with System.Security.Cryptography for cryptographic operations. 
• Basics knowledge of C++ and DLL development. 
• Experience in implementing CI/CD pipelines. 
• Excellent communication and collaboration skills. 
• Advanced Business English language knowledge. 
• Good analytical skills, oriented on continuous process improvement. 
• Responsibility for customer/partner relation growth. 

Nice to have: 

• Experience with IoT products in building automation and physical access control. 
• Mastery Degree in Computer Science or related field. 
• Understanding of general security concepts. 
• German language skills. 

Join CoreWillSoft GmbH and help build Windows-based software that protects critical facilities and infrastructure. We develop innovative physical security and access control solutions, integrating building automation, IoT devices, and high-security hardware. 

You’ll join an Agile, international team distributed across locations, with our headquarters in Bonn, Germany. We own the full product lifecycle — from discovery and implementation to release and operation — so your work will be visible, impactful, and close to real customer needs. 

What you`ll do: 

• Develop, maintain, and enhance Windows-based desktop applications using .Net. 
• Maintain and develop DLLs written in C++. 
• Implement CI/CD pipelines for development and QA processes. 
• Act as a liaison between the customer and the development team, collecting and synthesizing feedback into actionable tasks. 
• Ensure on-time delivery of high-quality products. 
• Collaborate with cross-functional teams, including engineering, sales, marketing, and support, to deliver successful projects. 
• Identify potential risks and issues within the project and propose mitigation strategies. 

What we offer: 

• Meaningful Impact: Build solutions that are used every day by thousands of businesses — your work will directly improve real-world security and connected device experiences. 
• Product & Process Ownership: Help shape not only the product, but also how we build and deliver it — your ideas and decisions will have visible impact. 
• Industry Influence: Contribute to key security standards and best practices, staying ahead of the curve in a fast-evolving industry. 
• Modern Tech Stack & Hardware: Work with the latest hardware and the tools you need to do your best work. 
• Time Off & Flexibility: 20 vacation days, paid sick leave, and public holidays in line with German legislation — plus flexibility built around outcomes, not micromanagement. 
• Learning & Development Budget: We support continuous growth by covering hard and soft skills courses, trainings, and access to e-learning platforms. 
• Coworking Support: Prefer not to work from home every day? We offer coworking compensation so you can choose the environment that fits you best. 
• Language Learning Support: Monthly fixed compensation you can use to improve your English or German through the learning format of your choice. 
• Strong Team Culture: Open collaboration, a flat structure, and thoughtful onboarding—your voice is heard, and you can make an impact from day one. 

What you bring: 

• Proven experience in Windows .Net Desktop application development. 
• Familiarity with System.Reactive and its extensions for reactive programming. 
• Experience with System.Security.Cryptography for cryptographic operations. 
• Basics knowledge of C++ and DLL development. 
• Experience in implementing CI/CD pipelines. 
• Excellent communication and collaboration skills. 
• Advanced Business English language knowledge. 
• Good analytical skills, oriented on continuous process improvement. 
• Responsibility for customer/partner relation growth. 

Nice to have: 

• Experience with IoT products in building automation and physical access control. 
• Mastery Degree in Computer Science or related field. 
• Understanding of general security concepts. 
• German language skills. 

Software integration engineer (.Net WPF/SQL Developer)

Провідний інженер – інтегратор сервісів.

Деталі проекту

Розробки модулів інтеграції із податковими системами, банків, логістики (електронні ТТН), електронним документообігом.
Мета — створення інноваційних безпаперових рішень для обміну документами та транзакціями. для швидкого, зручного та надійного функціювання бізнесу в сучасних умовах.

• Працюємо над власним продуктовим рішенням, а не аутсорс.
• Швидкий вплив на продукт — коротке плече між ідеєю та реалізацією.
• Прагнемо інновацій у сфері роздрібних технологій

Команда

• розробники 
• аналітик
• команда QA

Технології, які використовуються на проекті

.Net Framework WinForms, WPF/C#/MVC
.Net 8, MS SQL TSQL, Rest Api

Технічний стек кандидата і основні вимоги 

Досвід від 4 років у проєктуванні та розробці ПЗ, який має:

• Досвід програмування SQL / WPF (або WinForms) 
• Досвід інтеграції зовнішніх систем
• Досвід роботи з системами контролю версій GIT
• Ведення задач в Jira
• Високу відповідальність, самоорганізацію, ініціативність

Українська — вільне володіння

Англійська — на рівні читання технічної документації

Цілі на період онбордінга 

Знайомство з поточною системою

Адаптація в команді

Поступове включення у розробку та задачі

Можливості зростання

Професійний розвиток у межах R&D департаменту

Участь у впровадженні нових технологій

Розширення зони відповідальності та кар’єрне зростання