Jobs Poland, C# / .NET

ScenAI Data Science Inc

We are a U.S.-based fintech startup operating in the investment and financial services space. Our distributed teams work across Poland, the United States, and Ireland, collaborating on technology-driven solutions related to stocks and investments.

Security, compliance, and the responsible handling of sensitive financial data are central to how we operate, as we build scalable products in a regulated environment.

General

❖ 4–10 years in automation engineering

❖ Strong C# and OOP expertise

❖ Experience with Windows UI Automation (UIA2/UIA3)

❖ Prior hands-on with Silk Test (mandatory)

❖ Experience automating DevExpress WinForms apps

Legacy Experience (Critical)

❖ Experience working on .NET Framework 3.5 / 4.x applications

❖ Automation in thick-client enterprise systems

❖ Handling unstable UI identifiers

❖ Working with limited documentation

Framework & Design

❖ Build frameworks from scratch

❖ Implement POM / Component Object Model

❖ Logging, retry policies, custom wait strategies

Initial contract duration: 9 months with the possibility of extension based on the skill set

Hourly remuneration: 28-35 usd/hour

Engagement: full time

Time zone: Poland

Working language: English

Please read carefully before applying:

The client is building a product in the bank/investment/brokerage systems niche, and their investors have strict security and compliance requirements, where every person will go through a background check.

Why Poland?

For background check — you must be a taxpayer in Poland for 2+ years.

Akvelon is looking for Middle Software Development Engineers to join a long-term enterprise cloud project.
You will be part of a team responsible for developing and supporting cloud-native services running on Microsoft Azure. The role combines backend development with production support, troubleshooting, and continuous improvement of business-critical services.

We are looking for engineers who are comfortable not only building new functionality, but also investigating production issues and working with distributed cloud systems.

Requirements:
– Strong core C# and .NET proficiency alongside Go development skills (or strong willingness to learn Go)
– Proven experience designing, building, and maintaining cloud-native applications using Azure (Web APIs, Functions, WebJobs, Service Bus, Redis, Azure Storage, Cosmos DB, and VNets)
– Hands-on experience with Kubernetes-based cloud-native stack (Docker/containers, K8s, Helm, registries, AKS, Key Vault)
– Solid foundation in Linux/Unix environments, firmware, diagnostics, compute hardware, and remote management tools (e.g., Dell iDRAC)
– Strong foundation in secure coding practices, application security, and a threat-aware engineering mindset

Nice to have:
– Hands-on experience with cloud infrastructure management, Infrastructure as Code (ARM templates, Bicep), scripting, and automated CI/CD deployment pipeline
– Hands-on experience leveraging AI/ML to build diagnostic, troubleshooting, or support engineering solutions 
– Foundation in core networking concepts and protocols (VNets, BGP/VRF, routing, NAT/gateways, ToR switch / SoC programming, IPv4/IPv6) 
– Experience with host attestation, compute firewall management, or platform security (e.g., enterprise hardware security such as Dell PowerEdge attestation) 
– Hands-on experience building or configuring anomaly detection, alerting systems, and automated incident triage 
-Advanced knowledge of Azure Security posture, identity management, and compliance tools 

Benefits:

• Paid vacation and sick leave
• Official state holidays — 9-11 public holidays per year
• Professional growth through challenging projects and the opportunity to master new technologies
• Flexible working schedule: 8 hours per day, 40 hours per week
• Personal Career Development Plan (CDP)
• Employee support programs (discounts, healthcare, legal assistance)
• Paid external training, conferences, and professional certifications aligned with business goals
• Internal workshops, seminars, and English classes
• Corporate library with paper and e-books

If you’re a .NET engineer who enjoys working with Azure, cloud-native systems, and solving real production challenges, we’d love to hear from you.

Apply now and let’s discuss which level and opportunity would be the best fit for your experience!

Akvelon is looking for Middle and Senior .NET Software Engineers to join a long-term enterprise cloud project.

You will be part of a team responsible for developing and supporting cloud-native services running on Microsoft Azure. The role combines backend development with production support, troubleshooting, and continuous improvement of business-critical services.

We are looking for engineers who are comfortable not only building new functionality, but also investigating production issues and working with distributed cloud systems.

Start dates

• Middle .NET Software Engineer: September 1, 2026
• Senior .NET Software Engineer: September 17, 2026

Responsibilities:

• Design, develop, and maintain cloud-native applications and backend services using C# and .NET
• Build and support Web APIs and background services
• Work with Azure services such as Service Bus, Key Vault, Azure Storage, Cosmos DB, and Redis
• Investigate, troubleshoot, and mitigate production issues
• Improve service reliability, performance, and maintainability
• Apply secure coding practices throughout the development lifecycle
• Participate in technical discussions, code reviews, and engineering improvements
• Collaborate with engineers across international teams

Requirements:

• Strong commercial experience with C# and .NET
• Experience developing production-grade backend applications
• Hands-on experience with Microsoft Azure
• Experience with Web APIs and cloud-native / distributed applications
• Practical knowledge of several Azure services, such as:
  • Service Bus
  • Key Vault
  • Azure Storage
  • Cosmos DB
  • WebJobs
• Experience working with Redis or similar caching technologies
• Ability to diagnose and troubleshoot production service issues
• Understanding of secure coding practices and application security
• Good problem-solving and communication skills
• English sufficient for working in an international engineering environment

Nice to have

• Experience with Azure security, identity management, or compliance tools
• Experience with platform or infrastructure security
• Experience with host attestation or compute firewall management
• Experience building or configuring monitoring, anomaly detection, alerting, or automated incident-triage solutions
• Experience using AI/ML for security monitoring or threat detection

DRI / On-call schedule

The team provides production support through a rotating DRI (Directly Responsible Individual) schedule.

DRI shifts are planned to start in mid-January 2027.

• Each engineer will have a 1-week DRI shift approximately every 4 weeks
• Offshore engineers cover 8:00 PM – 8:00 AM PST
• During a DRI week, the engineer’s regular 8 working hours should fall within the corresponding 12-hour coverage window. These 8 hours are part of the regular working schedule and are covered by the normal salary
• The remaining 4 hours are on-call and are compensated at 0.5x
• If active incident resolution is required during those 4 on-call hours, that time is compensated at 1.5x
• For DRI coverage on non-working days, the same coefficients apply: 0.5x for on-call time and 1.5x for active incident resolution
• Only urgent incidents require attention outside regular working hours. The client does not expect such incidents to occur frequently
• Non-urgent incidents should be handled during normal working hours

This setup means that DRI is a rotational responsibility rather than a permanent night schedule, with one DRI week approximately every four weeks.

Benefits:

• Paid vacation and sick leave
• Official state holidays — 9-11 public holidays per year
• Professional growth through challenging projects and the opportunity to master new technologies
• Flexible working schedule: 8 hours per day, 40 hours per week
• Personal Career Development Plan (CDP)
• Employee support programs (discounts, healthcare, legal assistance)
• Paid external training, conferences, and professional certifications aligned with business goals
• Internal workshops, seminars, and English classes
• Corporate library with paper and e-books
   

Interested?

If you’re a .NET engineer who enjoys working with Azure, cloud-native systems, and solving real production challenges, we’d love to hear from you.

Project details:
Engineering support and feature development for large-scale datacenter edge infrastructure and bare-metal server fleets. Primary responsibilities focus on designing, building, and maintaining core control plane services (including hardware inspection, firmware management, software-defined networking (SDN), and resource orchestration layers) to ensure high availability and seamless virtualization

Engineers will drive automation, optimize operational diagnostic tools, and deliver bug fixes to streamline fleet onboarding and improve incident mitigation times. Also includes end-to-end service health ownership, covering security monitoring and compliance
Must have:
Strong core C# and .NET proficiency alongside Go development skills (or strong willingness to learn Go)
Proven experience designing, building, and maintaining cloud-native applications using Azure (Web APIs, Functions, WebJobs, Service Bus, Redis, Azure Storage, Cosmos DB, and VNets)
Hands-on experience with Kubernetes-based cloud-native stack (Docker/containers, K8s, Helm, registries, AKS, Key Vault)
Solid foundation in Linux/Unix environments, firmware, diagnostics, compute hardware, and remote management tools (e.g., Dell iDRAC)
Strong foundation in secure coding practices, application security, and a threat-aware engineering mindset
Nice to have:
Hands-on experience with cloud infrastructure management, Infrastructure as Code (ARM templates, Bicep), scripting, and automated CI/CD deployment pipeline - while it's a nice to have skill, it's important for candidates to be ready to do DevOps work, there is no dedicated team for it. 
Hands-on experience leveraging AI/ML to build diagnostic, troubleshooting, or support engineering solutions 
Foundation in core networking concepts and protocols (VNets, BGP/VRF, routing, NAT/gateways, ToR switch / SoC programming, IPv4/IPv6) 
Experience with host attestation, compute firewall management, or platform security (e.g., enterprise hardware security such as Dell PowerEdge attestation) 
Hands-on experience building or configuring anomaly detection, alerting systems, and automated incident triage 
Advanced knowledge of Azure Security posture, identity management, and compliance tools 

Akvelon is looking for Middle and Senior .NET Software Engineers to join a long-term project for a global technology leader. We are expanding several engineering teams building and supporting enterprise-scale cloud services used by millions of users worldwide. This is an opportunity to work with modern Azure technologies, distributed systems, and high-performance cloud applications.

Location is strictly limited to Poland and Serbia.

Responsibilities:

• Design, develop, and maintain cloud-native backend services using C# and .NET.
• Build scalable, reliable, and high-performance applications running on Microsoft Azure.
• Develop and improve distributed systems with a focus on reliability, scalability, and maintainability.
• Collaborate closely with engineers, architects, and product teams to deliver production-ready solutions.
• Investigate and resolve production issues, perform root cause analysis, and implement long-term improvements.
• Contribute to CI/CD pipelines and deployment automation.
• Participate in architecture discussions, code reviews, and technical design.
• Work with Azure networking, cloud infrastructure, and platform services.
• Depending on the team, contribute to Kubernetes (AKS)-based environments and cloud infrastructure improvements.

Requirements:

• Commercial experience with C# and .NET.
• Experience building backend services and APIs.
• Hands-on experience with Microsoft Azure.
• Understanding of distributed systems and cloud-native application architecture.
• Experience with Azure DevOps, CI/CD pipelines, or similar deployment tools.
• Experience troubleshooting production issues and improving application reliability.
• Knowledge of software engineering best practices, clean code, testing, and version control.
• Strong problem-solving skills and the ability to work in a collaborative engineering environment.

Nice to have:

• Experience with Azure Kubernetes Service (AKS) and containerized workloads.
• Knowledge of Azure networking concepts.
• Experience with Infrastructure as Code and cloud automation.
• Experience working with high-scale production systems.
• Familiarity with AI-assisted development tools such as GitHub Copilot or Azure AI.

Benefits:

• Paid vacation and sick leave.
• Official state holidays (9–11 public holidays per year).
• Professional growth through challenging enterprise-scale projects and the opportunity to master new technologies.
• Flexible working schedule: 8 hours per day, 40 hours per week.
• Personal Career Development Plan (CDP).
• Employee support programs (discounts, healthcare, legal assistance).
• Paid external training, conferences, and professional certifications aligned with business goals.
• Internal workshops, seminars, and English classes.
• Corporate library with paper and e-books.

If you’re passionate about building scalable cloud solutions and enjoy solving complex engineering challenges, we’d love to hear from you.

About the role:

Are you a hands-on .NET engineer who has grown into technical leadership and wants to make a real difference in healthcare? We are looking for someone who can own the technical direction of a large .NET production system, keep quality high, and increasingly guide how the product evolve and adopts AI and agentic capabilities.

You will work on the .NET Core production of a large system alongside a strong and friendly team. You will spend most of your time on architecture, design, and coding, with a meaningful slice of team-lead responsibility — mentoring engineers, contributing to estimation and planning, and coordinating technical work across the back-end team. This is a tech lead role with *some* team lead responsibilities, not a pure management position.

Team: 5 back-end and data engineers, 1 front-end engineer, and 4 QA/BA.

Skills & Experience:

- Background in software engineering; a degree in Computer Science or a related technical discipline;

- 7+ years of commercial experience with .NET (strong .NET Core, ASP.NET Core);

- Proven track record as a technical owner — architecture, design decisions, and hands-on delivery on large, long-lived systems;

- 3+ years of leadership experience (tech lead, senior/mentor role, or similar) — comfortable guiding engineers with and without being a full-time people manager;

- Strong SQL skills (understanding of how SQL queries work in order to suggest consistent engineering solutions);

- Experience with large enterprise projects;

- In-depth understanding of Entity Framework / EF Core;

- Solid grasp of testing discipline — unit, integration, and performance testing as part of the development process;

- Self-starter who's able to see a piece of work through from A to Z;

- Upper-intermediate English or above.

Nice to have:

- Practical exposure to building or integrating AI/agentic features into production applications (LLM APIs, tool calling, RAG, or similar);

- Azure DevOps skills and CI/CD experience (Azure DevOps / GitHub Actions);

- Advanced front-end JS skills;

- Experience with JS frameworks (React / Angular / Ember, etc.);

- Experience in building SPAs;

- Experience in a regulated domain (healthcare, life sciences) and awareness of data-privacy/compliance considerations;

Responsibilities:

Technical leadership

- Own the technical design and architecture of back-end and AI/agentic components; make and document pragmatic build/buy and framework decisions;

- Stay hands-on: participate in design, development, and integration, and write production code for the most critical or complex parts of the system;

- Define, advocate, and enforce best practices and coding standards; lead code review and refactoring;

- Cover code with unit, integration, and performance tests, and build evaluation/testing approaches for AI-driven features;

- Investigate performance bottlenecks and drive code optimization proactively;

- Be a key contributor to new release deployments and the technical health of the delivery pipeline.

Team lead responsibilities 

- Mentor back-end engineers and help grow their .NET, SQL, and AI/agentic capabilities;

- Help distribute and coordinate back-end technical work; provide direction on how work should be built;

- Participate in grooming, estimation, and planning sessions; help plan and implement change requests;

- Support product owners and stakeholders in making sound technical decisions, and provide status updates on back-end development when needed;

- Collaborate with other team members and roles (front-end tech lead, TDM, BSA, architect, DevOps, DBAs, etc.) and troubleshoot issues as they arise.

Join a product-focused engineering team developing solutions for the European construction industry. We are looking for a Middle/Senior .NET Developer who is ready to contribute not only to implementation but also to architecture discussions, technical improvements, and product evolution.

CUSTOMER

Our Customer is a European technology company specializing in solutions for construction site security, access management, and operational transparency. Over the past 15+ years, the company has evolved from a smart-lock product into a large ecosystem of web, mobile, and server-side solutions supporting construction businesses across Europe. The engineering organization includes distributed international teams and long-term collaboration with Sigma Software specialists.

PROJECT

The project is part of a large-scale product ecosystem designed for the European construction market. The platform helps construction companies manage access control, subcontractor relationships, security compliance, and operational risks across construction sites.

In this role, you will contribute to a system focused on analyzing companies involved in the construction process. The product enables site operators to monitor subcontractors, maintain compliance standards, and reduce long-term reputational and operational risks. 

Project technologies: C#, .NET, REST APIs, SOAP, MS SQL Server, Entity Framework, Kafka, Angular, TypeScript, Azure.

Job Description

• Design, develop, and maintain robust Back-end solutions using C# and .NET
• Participate in architecture discussions and contribute to technical solution design
• Develop and integrate RESTful APIs and SOAP web services
• Work on core modules development and perform refactoring when necessary
• Collaborate closely with developers, QA engineers, DevOps specialists, architects, and Product Owners
• Clarify business and technical requirements with internal and Customer-side teams
• Write and maintain unit, API, and integration tests
• Participate in peer code reviews and follow engineering best practices
• Investigate and introduce new technologies and technical improvements
• Troubleshoot issues across application, infrastructure, and database layers
• Prepare and maintain technical documentation
• Contribute to Front-end-related tasks using Angular and TypeScript when needed

Qualifications

• 4+ years of commercial software development experience with C# and .NET
• Strong experience designing, developing, and integrating Web APIs, including RESTful APIs and SOAP services
• Solid understanding of OOP, SOLID principles, and common design patterns
• Strong knowledge of Microsoft SQL Server and T-SQL
• Practical experience with LINQ, ADO.NET, and Entity Framework
• Experience working with event-driven systems and message brokers
• Experience writing and maintaining unit, API, and integration tests
• Experience with Angular or another modern Front-end framework/library
• Good knowledge of TypeScript
• Understanding of Front-end architecture, maintainability, and performance optimization
• Strong troubleshooting and debugging skills across application, database, and infrastructure layers
• Confident Git usage, including branching strategies, pull requests, and code reviews
• Intermediate or higher English level
• Strong communication skills and ability to work collaboratively in a cross-functional environment

Wіll be a plus:

• Experience with NoSQL databases
• Experience using AI-assisted development tools such as GitHub Copilot or Claude

Numerical Technologies LTD is a provider of custom software solutions and services specializing in risk, limits, and regulatory capital. We are currently looking for a Senior C#/.Net Developer to join our team. 

Project: Portfolio management systems for a US financial institution, focused on application migration to a new platform. 

What you will be doing:  

As part of the team, you will be participating in a client project focused on portfolio management solutions. You will help develop new software features, as well as support and maintain existing ones. You will be writing scalable and fault-tolerant code, debugging programs, and integrating applications with third-party web services. You will collaborate closely with the client and product manager to understand the system’s functional and non-functional requirements, and contribute to code quality through unit testing, integration testing, code reviews, and system design, helping deliver robust software aligned with the client's business needs.

What we are looking for:  

• 5+ years of commercial C#/.NET development experience.
• Deep understanding of object-oriented programming and software design principles.
• Strong experience developing desktop applications using WPF.
• Proficiency in SQL databases.
• Strong problem-solving skills and ability to collaborate effectively in a team environment.
• Upper-Intermediate level of English or above.

What will be a plus:

• Experience with the Infragistics library.
• Experience with other WPF UI libraries (e.g. DevExpress).
• Experience working with Java and Oracle.

What we offer: 

• Competitive compensation depending on experience and skills. 
• Regular assessments and salary reviews. 
• Paid personal days. 
• Mental health support program. 
• Language classes. 
• Flexible working schedule.