Jobs Poland, C# / .NET

Project Description:

Project is focused around rewriting hedgefund tax reporting tool

Responsibilities:

- Code, test and deploy
- Communicating with other teams and stakeholders
- Code reviews
- Configuration management
- Database design and optimization

Mandatory Skills Description:

- 5 years of experience
- Strong .net and SQL
- Experience of React

Nice-to-Have Skills Description:

- Exposures to Jekins/GitHub,

Languages:

English: B2 Upper Intermediate

We are looking for a motivated Junior .NET Developer to join our team!

About the Project:
A platform for mobile operators focused on invoicing, billing, and notifications. The solution helps both individual and business customers manage mobile services, control expenses, handle subscriptions, renew contracts, and activate SIM cards efficiently.

Requirements:
— Good knowledge of SQL;
— SQL Server experience (must have);
— Basic Knowledge of .NET / .NET Core;
— Experience with SQL and ADO.NET;
— Experience with Git (version control);
— Experience working with Jira (task and project tracking);
— Experience with Dapper is preferred;
— Intermediate / Upper-Intermediate level of English;
— Ability to work with and optimize existing codebases.

Would Be a Plus:
— Experience in Telecom or working with payment systems;
— Familiarity with telecom invoicing, billing, and notification systems.

Responsibilities:
— Develop, maintain, and enhance web and desktop applications using .NET technologies (including .NET 7 or higher);
— Design and implement database queries and scripts using SQL Server;
— Work with ADO.NET to manage data access layers and interact with SQL databases;
— Build and consume Web APIs for seamless integration with other systems;
— Participate in the full software development lifecycle — design, coding, testing, and deployment;
— Collaborate with cross-functional teams to define, design, and deliver new features;
— Debug and troubleshoot issues across the stack, particularly within .NET and SQL components;
— Follow best practices related to code quality, testing, and CI/CD deployment processes;
— Contribute to improving existing systems and optimizing performance.

We Offer:
— Monday–Friday working schedule (9:00–18:00 / 10:00–19:00);
— Work format: office / remote / hybrid;
— Medical insurance;
— No time trackers or excessive bureaucracy;
— Paid days off and sick leave;
— Gifts for birthdays and professional holidays;
— Opportunity to test your ideas, lead initiatives, and try new and interesting things;
— Collaboration with experienced specialists willing to share their knowledge;
— Participation in internal and external events, with opportunities to build or promote your personal brand.

Focus: Cybersecurity Remediation
Location: Poland (100% Remote)
English: B2+
Start Date: ASAP
Duration: 6+ months
Workload: Full-time


Required Tech Stack:
Strong expertise in .NET and C#
Experience with Azure DevOps (Pipelines)
Experience with Service Fabric (on-premise)
Knowledge of Angular and/or React

Project Scope
The contractor will support a cybersecurity remediation project with focus on Service Fabric integration, SSDLC compliance, and CI/CD automation within an on-premise environment.

Expected Deliverables
1. Service Fabric Integration
-Fully ported and functional code deployed as Reliable Services or -Containers in an on-premise Service Fabric cluster
-Optimized service-to-service communication
-Proper state management (Stateless/Stateful services)
-Integrated health monitoring
2. SSDLC Compliance Package
-Integration of security gates within the development lifecycle (SAST/DAST reporting)
-Secure configuration management implementation
-Identity provider integration (OIDC / OAuth2)
-Implementation of data encryption standards
3. Automated CI/CD Pipelines
-Infrastructure as Code (IaC)-based deployment pipelines
-Automated testing and security scanning
-Zero-downtime rollouts (rolling upgrades) to the cluster
4. Documentation & Handover
-Detailed technical documentation of the new architecture
-Knowledge transfer sessions for internal DevOps and security teams

What You’ll Be Driving:

• Leading tech team;
• Server-side developing of products using .NET 8, ASP.NET Core (Web API), EntityFramework Core, Redis, Kafka, PostgreSQL, Elasticsearch, Docker;
• Developing of high-load services;
• Application architecture design;
• Code reviewing and improving the current team's skills;
• Working in close collaboration with others in the team and across the business;
• Closely communicating with BAs and product managers, providing the best solutions and influencing the product.
   

What Makes You a GR8 Fit:

• Knowledge of .NET Core and ASP.NET Core, with 3+ years of commercial development experience;
• Software Design knowledge: SOLID, OOD, Design patterns;
• Experience with SQL, NoSQL database;
• Good understanding of the principles of distributed systems;
• Work experience in Agile environment;
• Experience with CI, UnitTests, Integration Tests;
• Upper-Intermediate+ English level.
   

Desirable skills:

• Experience with high-load projects;
• Experience with RabbitMQ, Redis, Kafka, SignalR;
• Experience with Kubernetes;
• Experience with ELK stack.

Please note that the project location is Gdansk, and it's required to visit the office 2-3 times per quarter

Job Description

Must have:

• 6+ years of professional software development experience.
• Strong experience with windows development.
• Strong understanding of software design principles, data structures, and algorithms.
• Experience working with complex, large-scale, or long-lived codebases.
• Strong problem-solving skills and attention to detail.
• Good communication skills and ability to work effectively in cross-functional teams.

Nice to Have

• Experience working on mission-critical or safety-relevant applications (aviation, navigation, defense, medical).
• Hands-on experience with C/C++ (performance-critical components, legacy code, or system-level logic).
• Hands-on experience with Swift or/and RUST
• Experience with performance profiling and optimization tools.
• Exposure to geospatial, mapping, or navigation-based applications.
• Experience working in an Agile / Scrum environment.
• Knowledge of CI/CD pipelines for mobile applications.

Job Responsibilities

Key Responsibilities:

• Application Development: Design and implement new features for the EFB application using C# and the .NET framework.
• Optimization: Ensure the application performs reliably under the hardware constraints of mobile devices (e.g., tablets), focusing on memory management and processor efficiency.
• Aviation Integration: Develop and maintain modules for complex flight-critical tasks, including weight and balance computations, fuel planning, and electronic logbook management.
• Data Management: Design and optimize local data-stores (embedded databases) for offline access to navigation charts and manuals.
  UI/UX Design: Create user-friendly interfaces tailored for cockpit environments, ensuring ease of use during critical phases of flight.
• Testing & Compliance: Conduct rigorous unit and regression testing to ensure software reliability, adhering to industry safety standards like DO-178C where applicable.
• Legacy Maintenance: Debug, refactor, and update existing C# codebases to add new features or improve system stability.

Department/Project Description

We are seeking a Mobile Developer to design, develop, and maintain our Electronic Flight Bag (EFB) application. You will work on a mission-critical system built in C# specifically for the Windows platform. Your role is essential in transitioning flight crews to paperless cockpits by delivering high-performance, reliable software that handles navigational charts, flight planning, and real-time performance calculations.

Project Description:

You'll be working within a team in Poland - Krakow / Wroclaw. The team is specialized on Microsoft technologies (.Net), fast time to market, agile methodology and always with a client centric delivery approach. We are looking for a software developer to help design and build a cutting-edge application for investors to create, manage, and share client portfolios, along with executing trades. This role involves working on high-performance, scalable systems that support real-time investment decision-making. You will be responsible for architecting, developing, and optimizing core backend functionalities while collaborating with global teams to deliver a seamless investor experience. It's a demanding, fast paced and exciting environment

Responsibilities:

• translate business requirements (functional and non-functional) into designs and code
• work with stakeholders drawn from IT and the Business, subject matter experts, vendor teams, enterprise architects and business analysts to develop your code related to our solutions
• drive excellence in: software analysis, design & coding, development methodologies, oral/written communication skills, technology planning, application rationalization analysis
• challenge the status quo and come up with new ideas and solutions

Mandatory Skills Description:

• comprehensive knowledge in Software Engineering with .NET, JavaScript (TypeScript), React.js with Redux, Immutable.js, HTML, CSS, SASS, ASP.NET Core, SQL and TSQL
• Azure Cloud Native development
• good understanding of software development tools (e.g. GIT, Teamcity)
• a verbal communicator, comfortable interacting with colleagues in English

Nice-to-Have Skills Description:

• a strong understanding of the software development lifecycle and Agile methodologies
• experience in a global environment
• a strong problem solver and a good team player
• analytical skilled person who manages to cope with complex challenges in software engineering

Project Description:

We are looking for passionate and creative developers eager to craft innovative products and embrace new technologies. You will be part of a small, agile, and highly skilled team of technologists who are building next generation of solutions for Risk Management team and Portfolio Managers.

To thrive in our team, you should possess an independent mindset while enjoying a collaborative working environment. We value candidates with full software lifecycle experience, encompassing requirements gathering, implementation, testing, release, and ongoing support.

Work from office in Warsaw, Gdansk, Krakow, Wroclaw

EST working hours

Responsibilities:

Required qualifications:
• Minimum 5 years of backend development experience, preferably within the hedge fund or financial services industry
• Strong passion for backend architecture and application development, with a commitment to continuous learning and improvement
• Deep understanding of Object-Oriented Programming, SOLID principles, and design patterns
• Excellent communication skills and a collaborative mindset

Mandatory Skills Description:

• C#, ASP.NET Core, .NET Core, Entity Framework Core
• Building and optimizing high-load, high-performance, data-driven backend systems
• Designing and implementing RESTful and SOAP-based web services
• Experience with Service-Oriented Architecture (SOA)

Nice-to-Have Skills Description:

• Exposure to JavaScript/UI frameworks (e.g., Angular, Bootstrap, jQuery) is a plus but not required
• Experience with Portfolio and Risk Management systems (e.g., What-If analysis, scenario modeling, real-time pricing)
• Familiarity with financial instruments (equities, derivatives, fixed income, etc.)
• Strong grasp of RDBMS concepts, data modeling, and database design
• Practice of Test-Driven Development (TDD) and performance profiling across the stack

Project Description:

We are looking for a senior software engineer to join our team in a derivatives trading company with a broad product portfolio, with specific emphasis on interest rates, currency, and related derivative products.
The candidate will be a key contributor to greenfield development in our trading space. The role will interact with the larger development team, share design and solutions, and contribute to the overall objectives of the development team.

Responsibilities:

- This role will be part of the new system development team responsible for handling fixed income trading processes
- The role will take responsibilities to design and develop applications to enhance business functions.
- The role will be part of the development team. He or she will need to follow development standards and contribute to the overall agenda of the team

Mandatory Skills Description:

• 6-7 years practical work experience involving system architecture, software application and message and data transfer and processing.
• Be well-versed in C#/.Net and have an active interest in other computing technology and tools.
• Familiarity with Banking , ideally Fixed Income is a big plus.
• This is a hands-on programming position, so we are seeking candidate with solid knowledge in computer science, math and proficient coding skills.
• Familiarity with the design and implementation of data/message transfer and processing.
• Have an excellent communication skills; a good teamwork and a strong work ethic.
• Have the maturity to solve problems directly and independently.
• Undergraduate preparation in Computer Science or similar engineering degree with successful academic achievement or equivalent professional work experience.

Nice-to-Have Skills Description:

- MongoDB knowledge highly preferred
- C++ knowledge would be a benefit
- React would be a benefit
- Reddis, Kafka
- 2+ years in financial industry, experience with trade flows, trade process

Sprinterra is a friendly and collaborative technology consulting company delivering software solutions for clients across finance, real estate, retail, and other industries. We work on diverse projects - from business process automation to complex enterprise platforms - giving our teams the opportunity to solve different challenges, learn new domains, and grow professionally. Our environment is open, supportive, and flexible: we value clear communication, personal ownership, and teamwork, and we encourage everyone to contribute ideas and help shape how we deliver projects.

About the project

Our customer is a privately held financial services consulting firm, which provides its services in following sectors:

• Direct lending
• Commercial real estate
• Residential mortgages
• Structured & speciality finance

Its clients include the world's leading asset managers, insurance companies, institutional investors, service providers, law firms and banks.

Our client currently has multiple .NET applications that utilize outsourced application development: in the residential mortgage origination and serving domain, and in the fund of fund management domain.

• They are built on Microsoft .NET Web technology stack with MS SQL server database
• The applications are deployed in Microsoft Azure IAAS / PAAS services
• Full development lifecycle is supported with Development / Test, QA, UAT and Production nodes
• Agile development methodology is utilised. JIRA is used for requirement and project management
• All applications are in production, with on-going functional enhancements and features being added

Position Overview

You will be working closely with our clients' team in a team extension format. The client's office is located in the EST time zone and you are expected to join the daily stand up meetings, planning meetings, etc. (usually in the morning EST time)

The software ingests data from various sources and creates positions, cash flows, net present values, expenses, interest, principal repayments and various analytics based on formulas. This information resides in a database. The users can produce reports in Excel and PDF formats or publish to a Business Intelligence tool that allows to create custom reports and views. Currently Power BI is used, though it is possible that another solution will be used in the future.

Our client needs help with 2 projects:

• Managing the receipt and upload of files, implementation of new and changes to the existing models, data repositories that populate BI tools, BI reports and templates.
• Optimisation and customisation of large scale reports for some of the clients (may have 100’s of 1,000’s records). In order to generate a report, you will have to consume data from an API and / or flat files and apply custom logic that may be customized for each client, 

This role requires experience in the following technologies:

• Microsoft .NET Framework 4.8
• Microsoft ASP.NET MVC
• Microsoft SQL Server 2022
• Microsoft SQL Reporting services (SSRS)
• Microsoft Power BI

It is nice to Have:

• Experience in high availability Web farm deployment architecture
• Deployment of applications in a virtual/cloud environment preferably Microsoft Azure / HPC experience
• Microsoft SQL Server Integration Services (SSIS)

Our perfect candidate should have:

• 3-5 years programming experience
• At least 3 years experience in .NET technologies
• Experience in both front end and server side (web services) development, using .NET
• Experience working with Power BI
• Participation in several different application developments in their chosen technology stack, assuming roles that show a progressing and maturing skill set over time
• Experience with agile development methodologies and understanding of roles within an agile methodology

Sprinterra is a friendly and collaborative technology consulting company delivering software solutions for clients across finance, real estate, retail, and other industries. We work on diverse projects – from business process automation to complex enterprise platforms – giving our teams the opportunity to solve different challenges, learn new domains, and grow professionally. Our environment is open, supportive, and flexible: we value clear communication, personal ownership, and teamwork, and we encourage everyone to contribute ideas and help shape how we deliver projects.

About the project

Our customer is a privately held financial services consulting firm, which provides its services in following sectors:

• Direct lending
• Commercial real estate
• Residential mortgages
• Structured & speciality finance

Its clients include the world’s leading asset managers, insurance companies, institutional investors, service providers, law firms and banks.

Our client currently has multiple .NET applications that utilize outsourced application development: in the residential mortgage origination and serving domain, and in the fund of fund management domain.

• They are built on Microsoft .NET Web technology stack with MS SQL server database
• The applications are deployed in Microsoft Azure IAAS / PAAS services
• Full development lifecycle is supported with Development / Test, QA, UAT and Production nodes
• Agile development methodology is utilised. JIRA is used for requirement and project management
• All applications are in production, with on-going functional enhancements and features being added

Position Overview

You will be working closely with our clients’ team in a team extension format. The client’s office is located in the EST time zone and you are expected to join the daily stand up meetings, planning meetings, etc. (usually in the morning EST time)

The software ingests data from various sources and creates positions, cash flows, net present values, expenses, interest, principal repayments and various analytics based on formulas. This information resides in a database. The users can produce reports in Excel and PDF formats or publish to a Business Intelligence tool that allows to create custom reports and views. Currently Power BI is used, though it is possible that another solution will be used in the future.

Our client needs help with 2 projects:

• Managing the receipt and upload of files, implementation of new and changes to the existing models, data repositories that populate BI tools, BI reports and templates
• Optimisation and customisation of large scale reports for some of the clients (may have 100’s of 1,000’s records). In order to generate a report, you will have to consume data from an API and / or flat files and apply custom logic that may be customized for each client

This role requires experience in the following technologies:

• Microsoft .NET Framework 4.8
• Microsoft ASP.NET MVC
• Microsoft SQL Server 2022
• Microsoft SQL Reporting services (SSRS)
• Microsoft Power BI

It is nice to Have:

• Experience in high availability Web farm deployment architecture
• Deployment of applications in a virtual/cloud environment preferably Microsoft Azure / HPC experience
• Microsoft SQL Server Integration Services (SSIS)

Our perfect candidate should have:

• 3-5 years programming experience
• At least 3 years experience in .NET technologies
• Experience in both front end and server side (web services) development, using .NET
• Experience working with Power BI
• Participation in several different application developments in their chosen technology stack, assuming roles that show a progressing and maturing skill set over time
• Experience with agile development methodologies and understanding of roles within an agile methodology