Bluegeko

Senior .NET Developer / Technical Lead (WARSAW)

Location: Warsaw, Poland 
Type: Full-time, in-house (NO Remote)
Remote: No
Workplace: New advanced office in Warsaw
Salary: Up to $6,500/month equivalent, based on experience
Bonus: Performance-based bonuses linked to delivery and output

One of the largest logistics and storage companies in the region is looking for a Senior .NET Developer / Technical Lead to take ownership of a major technology project.

This is a hands-on lead role for someone with strong commercial experience who can join as the main technical person, work directly with the CEO and leadership team, build the core platform foundation, and later help grow the development team around it.

The project is focused on reducing dependency on legacy operational software by creating a modern, API-connected platform using a strong CRM/CMS-style foundation, with custom integrations where needed.

What you will do

• define the technical architecture
• build and configure the core platform foundation
• design and connect APIs between key systems
• integrate website, customer portal, mobile app, access control, payments, reporting, and notifications
• create clean documentation and development standards
• decide what should be built, bought, configured, or integrated
• help recruit and lead additional developers once the foundation is ready

What we need

• strong commercial experience with .NET / C#
• proven experience building or leading real business platforms
• good understanding of CRM, CMS, ERP, or operational systems
• experience with API architecture and third-party integrations
• database and cloud infrastructure knowledge
• strong security, permissions, and documentation mindset
• ability to work hands-on and deliver visible progress
• confidence working directly with senior leadership

What we offer

• full-time in-house role in Warsaw
• new advanced office environment
• direct cooperation with the CEO and leadership team
• long-term strategic technology project
• real ownership of technical direction and delivery
• opportunity to build and lead your own team over time
• salary up to $6,500/month
• performance-based bonuses linked to measurable output
• possible residency / work permit sponsorship for Ukrainian candidates where required

Who this suits

This role suits someone who wants real ownership and responsibility. You will not join a large existing development team or maintain someone else’s roadmap. You will be the first key technical lead on the project.

You will build the core, prove the architecture, connect the right systems, and help create the future technology infrastructure of a fast-growing logistics and storage company.

Senior AI / LLM Engineer (GenAI Systems)

We’re building a next-gen AI infrastructure platform focused on LLMs, intelligent matching, and scalable systems.

Looking for a Senior AI Engineer to help design and ship real-world AI systems across models, infrastructure, and production.

Work format: Preferred On-site / Open to Hybrid / Remote can be discussed potentially.

Bonus: Performance and delivery bonuses included.

What You’ll Work On
• Build and scale AI pipelines end-to-end
• Develop and deploy LLM-powered systems
• Work on inference optimization and performance
• Design RAG systems, agent workflows, and structured outputs
• Improve prompting, NLP, and data quality

Tech You’ll Likely Use
(You don’t need everything — depth in a few areas is what matters)
• Engineering proficiency (CI/CD, Version controls, Containers, APIs, Databases)
• Python + ML frameworks (PyTorch / Keras / TensorFlow)
• LLMs & GenAI tooling (RAG,  LangChain, Vectors)
• Function Calling & Structured Outputs

What We’re Looking For
• Experience building LLM or ML systems in production
• Strong understanding of modern AI / transformer-based models
• Comfortable working across model + system + product layers
• Bias toward shipping and solving real problems

Nice to Have (Not Required)
• Semantic / Linguistic experience
• NER, NLP, Classification, Extraction, or Structured Data systems
• MLOps & Inference ( CUDA / vLLM / Ollama / Triton / DeepSpeed / FSDP)
• Fine-tuning (SFT, DPO, etc.) or Dataset / Curriculum curration
• Advanced degree (PhD)

What We Want
• Systems thinker (infra + model + product)
• Ships fast, builds real systems
• Comfortable in high-growth, ambiguous environments

Extra Info

Main onsite office in Kyiv with a high tech workspace, chef-made daily lunches. Team presence also in Warsaw and Prague.

Overview

We’re looking for a .NET Core C# Engineer to help build and maintain scalable cloud-native backend systems and high-load distributed services.

You’ll work with development, product, and infrastructure teams to develop modern microservices-based solutions on Microsoft Azure.

Responsibilities

• Develop backend services using C# and ASP.NET Core;
• Build and maintain cloud-native microservices;
• Design and optimize REST APIs and distributed systems;
• Work with Azure, Docker, Kubernetes, and Kafka;
• Build CI/CD pipelines and deployment automation;
• Automate CloudOps and infrastructure workflows;
• Troubleshoot production issues and improve system reliability;
• Collaborate with cross-functional engineering and product teams;
• Support architecture improvements and developer tooling initiatives.

Requirements

• 5+ years of experience with .NET / C# development;
• Strong experience with ASP.NET Core and .NET Core;
• Hands-on experience with Microsoft Azure;
• Experience with Docker and Kubernetes;
• Understanding of microservices architecture and REST APIs;
• Experience with SQL and Entity Framework Core;
• Knowledge of CI/CD and automation practices;
• Strong understanding of OOP and SOLID principles;
• Experience troubleshooting production systems;
• Good communication and teamwork skills;

Bonus (Not Must)

• Experience with Kafka or event-driven systems;
• Background in Automation QA;
• Experience with high-load systems;
• Familiarity with Backstage or developer platforms;
• FinTech, Healthcare, or Media domain experience;
• Interest in frontend or full-stack development.

Mid-Level Data Engineer — AI & HealthTech

About the Role

We are looking for a Mid-Level Data Engineer to help build and scale our in-house AI systems focused on the health and fitness industry. 

You will work closely with Senior ML engineers and backend developers to design data pipelines, optimize large datasets, and support machine learning infrastructure used across our platform.

This role is ideal for someone who enjoys solving data challenges, thinks out of the box, and contributing to AI-driven products that impact real users.

Responsibilities

• Build and maintain scalable ETL/ELT data pipelines
• Structure and optimize large health, fitness, and behavioral datasets
• Support AI/ML workflows and data preparation for model training
• Design efficient database schemas and data architectures
• Work with APIs, third-party integrations, and real-time data processing
• Monitor data quality, integrity, and performance
• Collaborate with engineering and AI teams on internal tooling and automation
• Improve infrastructure for analytics and AI deployment

Requirements

• 2–4+ years of experience as a Data Engineer or similar role
• Strong experience with SQL and relational databases
• Experience with Python for data processing and automation
• Familiarity with cloud platforms such as AWS or Azure
• Experience with data warehousing and pipeline tools
• Understanding of AI/ML data workflows is a strong advantage
• Ability to work independently and solve complex technical problems
• Strong communication and documentation skills

Nice to Have (Not must)

• Experience working with healthcare, medical or fitness-related data
• Knowledge of vector databases, embeddings, or LLM infrastructure
• Experience with Airflow, Kafka, Spark, or similar tools
• Exposure to analytics and BI platforms

What We Offer

• Flexible remote-friendly environment
• High ownership and fast-moving team culture
• Competitive salary with bonuses.
• Long-term growth opportunities.

Location

Remote / Hybrid (Preferred overlap with EU or US time zones)

Overview

We’re looking for a Flutter Developer to help build and maintain modern cross-platform mobile applications.

You’ll work closely with product, design, and backend teams to develop scalable and user-friendly mobile solutions using Flutter and Dart across Android and iOS platforms.

Responsibilities

• Develop and maintain mobile applications using Flutter and Dart;
• Build clean, scalable, and maintainable application architecture;
• Integrate REST APIs, WebSockets, and third-party services;
• Work with state management solutions such as BLoC, Provider, or Riverpod;
• Collaborate with UI/UX designers and backend developers;
• Optimize app performance and troubleshoot production issues;
• Support application publishing and release processes for App Store and Google Play;

• Participate in code reviews and technical discussions.

   

Requirements

• 3+ years of experience with Flutter development;
• Strong knowledge of Dart and mobile application development;
• Experience with Clean Architecture and SOLID principles;
• Experience with REST APIs and real-time communication (WebSocket / Socket.IO);
• Familiarity with Firebase services and local storage solutions;
• Experience with state management tools such as BLoC, Cubit, Provider, or Riverpod;
• Understanding of mobile app lifecycle and app publishing processes;
• Good problem-solving and communication skills;
• Ability to work independently and within a team.

Bonus (Not Must)

• Experience with Google Pay / Apple Pay integrations;
• Experience with TestFlight and App Store deployment;
• Knowledge of Unity or C#;
• Experience in ride-hailing, fintech, or crypto-related products;
• Familiarity with CI/CD for mobile applications;
• Experience with GoRouter, GetIt, Retrofit, or Figma integration.

Overview

We’re hiring a Junior Machine Learning Engineer to work with our AI/ML Team building and scaling intelligent ML systems powering personalized digital experiences across mobile apps and connected platforms.

You’ll work across ML, data infrastructure, and backend systems to bring production-ready AI features into real-world products. This is a hands-on role for someone experienced in deploying scalable ML solutions and optimizing them in live environments.

Responsibilities

• Design, train, and deploy ML models for personalization, recommendations, and computer vision;
• Build scalable batch and real-time data pipelines;
• Integrate ML models into production applications and APIs;
• Improve model monitoring, retraining, and inference performance;
• Collaborate with product, engineering, and data teams on ML-driven features;

• Contribute to cloud-native ML platform architecture and MLOps practices.

   

Requirements

• 2 years of experience in Machine Learning Engineering or Applied AI;
• Experience with recommendation systems, personalization, or computer vision;
• Solid Python skills and hands-on experience with TensorFlow, PyTorch, and scikit-learn;
• Proven experience deploying and maintaining ML systems in production;
• Experience with MLOps and data tools such as MLflow, Airflow, Kafka, BigQuery, or dbt;
• Basic Familiarity with FastAPI, TensorFlow Serving, TorchServe, or ONNX;
• Basic Experience with AWS, GCP, or Azure, including Docker/Kubernetes environments;
• Strong collaboration and communication skills.

Bonus: Experience with edge AI, mobile ML, or image/video processing systems.

Ruby Backend Developer (Remote)

Role

Bluegeko is looking for a Ruby Backend Developer to join our fully remote team. You will work on scalable backend systems and APIs for U.S. based partner projects, collaborating with developers, QA engineers, and product teams across international environments.

Tech Stack

• Ruby / Ruby on Rails
• PostgreSQL
• REST APIs
• Sidekiq
• Redis
• Docker
• AWS
• GitHub / GitLab
• CI/CD pipelines
• RSpec

Responsibilities

• Develop and maintain backend services and APIs
• Participate in architecture discussions and code reviews
• Collaborate with developers, QA, and product teams
• Analyze requirements and break down technical tasks

• Improve system performance and reliability

   

Requirements

• 3yrs+ Experience with Ruby and backend development
• Experience with Ruby on Rails and SQL databases
• Understanding of scalable backend systems and APIs
• Familiarity with Git workflows and CI/CD
• Good English communication skills

What We Offer

• Fully remote position
• Competitive salary
• Performance bonuses (For delivery)
• Flexible working hours
• International U.S. projects
• Professional development opportunities
• Work on large-scale infrastructure products used globally