Kozak Agency

We are looking for a Java + Angular Developer for a potential client project.

Requirements:

• Strong experience with Java
• Good experience with Angular
• Polish language — conversational or higher
• Good English is a plus
• Commercial development experience

At this stage, we are only collecting CVs. Project details, scope, and other requirements will be shared later.

Type: Full-time

Position Description:
As a Data Engineer, you will play a key role in designing and maintaining scalable data pipelines and platforms.
You’ll work closely with data scientists, analysts, and product teams to ensure high-quality, reliable, and scalable data is always available. This role requires deep technical expertise, strong analytical skills, and exposure to emerging AI/LLM technologies
Location(s): Germany & EU
Working Model: remote

Role Overview
As a Senior Data Engineer, you will play a key role in designing and maintaining scalable data pipelines and platforms. You’ll work closely with
data scientists, analysts, and product teams to ensure high-quality, reliable, and scalable data is always available. This role requires deep
technical expertise, strong analytical skills, and exposure to emerging AI/LLM technologies.

Key Responsibilities

• Design, develop, and optimize scalable data pipelines using Python and PySpark.
• Build, manage, and optimize big data solutions leveraging Google Cloud Platform (BigQuery, DataProc, Dataflow).
• Collaborate with cross-functional teams to translate business requirements into efficient data models and workflows.
• Ensure data accuracy, consistency, and availability across multiple systems and applications.
• Implement best practices for data governance, quality, and security.
• Stay updated with advancements in big data, cloud, and AI technologies, recommending innovative solutions.
• Mentor junior engineers and establish best practices within the team.

Requirements for "Professional Skills"
All professional skills required to fulfill the following general task description:
Works as a developer and is responsible for the development and programming of software, tools, systems, etc., as well as the associated troubleshooting and error analysis. This role requires comprehensive knowledge of various programming languages as well as appropriate development tools, methodologies, and development processes.

Works on the integration of systems, applications, or databases with one another or into other systems/software. This role requires exceptional knowledge of scripting and various programming languages, along with relevant integration tools, methods, and processes. It also requires a strong understanding of the technologies or systems being integrated.

Also works as an engineer and documents operational requirements in the form of system performance parameters and system configurations. He/she is additionally responsible for ensuring the seamless integration of architecture and development.

This also includes system integration or network integration activities, for example, SDM.

Projects using Agile development methodology:
If the contractor works within a Scrum team, they possess extensive knowledge of Scrum methodology and have experience in developing software within such a framework.

Requirements for "Social Skills"
All social skills required to fulfill the previously mentioned general task description as well as the following requirements:
The employee has intermediate-level experience, typically between 2 and 5 years, in their role or in the tasks performed by the group. Alternatively, the role and responsibilities require solid, but not exceptional, expertise.
The activities are associated with a moderate level of complexity and responsibility and require the ability to work independently.
The project may be carried out at either a national or international level.

Other Requirements & Relativizations
Skill Sets
Core Technical Skills

• Python (expert-level coding, modular programming, debugging, performance optimization)
• PySpark (distributed processing, tuning, handling large-scale data, performance optimization)
• Google Cloud Platform (GCP):
• BigQuery – advanced SQL, optimization, partitioning, clustering, cost management
• DataProc – Spark/Hadoop cluster management, job orchestration
• Dataflow – streaming & batch pipelines, real-time processing

Big Data & Cloud Skills

• Strong understanding of big data technologies (distributed computing, Hadoop/Spark ecosystem, data lakes, Kafka, batch & stream processing)
• Experience with data modeling and designing scalable data pipelines
• Familiarity with cloud-native architectures and serverless processing
•  

Analytical & Problem-Solving Skills:

• Ability to analyze complex data sets and derive insights
• Strong logical and critical thinking
• Experience optimizing query performance and pipeline efficiency
• Comfortable troubleshooting large-scale data workflows
• Preferred / Nice-to-Have Skills
• Experience with CI/CD pipelines for data engineering workflows
• Workflow orchestration: Airflow, Cloud Composer, Dagster
• Data governance, data quality frameworks, and compliance standards
• AI & Advanced Analytics Exposure
• Familiarity with Large Language Models (LLMs) and their applications in data workflows
• General understanding of AI/ML concepts and how they integrate with data engineering pipelines
• Exposure to MLOps tools or frameworks for deploying and monitoring AI models

Soft Skills

• Strong communication and collaboration with cross-functional teams
• Ability to work in Agile environments
• Mentoring and guiding junior engineers
• Self-driven, proactive learner, and adaptable to emerging technologies

Key details:
Start date: 1 October 2026
Duration: initially until 31 December 2026
Option to extend: until 31 December 2027
Workload: approx. 400 hours in 2026, with an option to extend to approx. 1,680 hours in 2027
Location: predominantly remote (approx. 80%), with occasional assignments in Hanover or at the client’s premises.

Project background: As part of an AI and machine learning initiative, we are driving forward the further development and support of data-driven solutions for various specialist areas within the social security sector. We are seeking support in the development, optimisation and operation of modern data and AI platforms.

Responsibilities:

• Carrying out data collection, data cleaning and data transformation
• Creating and maintaining dashboards for data visualisation
• Setting up and maintaining data pipelines
• Identifying and testing new areas of application for AI-based solutions

Requirements:

• At least 2 years’ experience with SQL, data transformations, data pipelines and data storage (DB/DWH)
• At least 2 years’ practical experience in software development using Python
• At least 2 years’ experience in developing ETL pipelines
• At least 2 years’ experience in data-driven projects (please specify the project objective of each reference project, your role and the tasks you carried out)
• At least 2 years’ experience in agile development teams
• German language skills at C1 level or higher !!!

Desirable:

• Two years’ professional experience in CI/CD development
• Two years’ professional experience with Jenkins and ArgoCD
• Two years’ professional experience with Argo Workflows
• Two years’ professional experience with Kubeflow or OpenShift AI in a machine learning environment
• Two years’ professional experience with machine learning and the practical application of ML models
• Two years’ professional experience with unit and integration testing
• Two years’ experience in the field of statutory social insurance
• Two years’ project work in a SAFe environment

Workload: full-time, remote
Start: asap
Duration: long and fixed-term (~9–12 months) but with a right to a 8 week notice period
Location: Poland !!!
English: B2

Important info:
Client is very technical and knows who they are looking for, has to be Poland based, max 2-3 hours travel to Wrocław as they have a small team in Wrocław, Poland. Mid + senior profiles are okay.

The Role
A backend-focused engineering position on a transformation project for an international travel company. The engineer will own features end-to-end - from planning and design through building, testing, and release.

Key Responsibilities

• Own features end-to-end (plan, design, build, test, release)
• Build and maintain Ruby on Rails systems
• Contribute to full-stack work (Rails-heavy, with frontend involvement as needed)
• Write tested, high-quality code
• Use AI coding agents to maximize efficiency
• Participate in code reviews
• Maintain systems and resolve production issues
• Collaborate with Product, Design, and Quality Engineering teams

Required Qualifications

• Proficiency in Ruby on Rails with production experience
• Strong database schema design and data modeling skills
• RESTful API design experience
• PostgreSQL and AWS infrastructure knowledge
• Demonstrable experience with AI coding agents, or strong enthusiasm to adopt them
• Good English
• Team-oriented with strong communication skills
• Pragmatic about speed/quality/scope tradeoffs

Tech Stack
Ruby on Rails, PostgreSQL, AWS, Next.js, Vercel. Trunk-based development with CI/CD and multiple daily deployments.

Nice to Have

• E-commerce or travel platform experience
• An eye for UX/design
• Travel enthusiasm

The Consultant will be responsible for designing, developing, and maintaining Power BI reporting and automation solutions to support business decision-making across the organization. This role will drive the company’s Power BI automation strategy, leveraging Microsoft Fabric, Power Platform tools, and Azure services to implement scalable, automated, and intelligent reporting solutions.

Key Responsibilities:
1. Power BI Development & Reporting Automation

• Design, develop, and maintain interactive Power BI reports and dashboards to support various business functions.
• Implement automated reporting workflows based on predefined thresholds, alerts, and KPIs to proactively notify stakeholders of key business changes.
• Develop and optimize data models, DAX calculations, and Power Query transformations to ensure efficient performance and scalability.
• Ensure high standards of data accuracy, consistency, and security within the Power BI environment.

2. Microsoft Fabric Implementation

• setup and management of Microsoft Fabric environments, including Data Factory, Lakehouse, Warehouse, and Pipelines.
• Collaborate with the data engineering team to design and deploy end-to-end data pipelines using Fabric for unified data management.
• Leverage Fabric features to automate data ingestion, transformation, and delivery for enterprise reporting.

3. Power Platform Integration (Power Automate & Power Apps)

• Develop and maintain Power Automate workflows for data refresh scheduling, alert automation, and system integration.
• Build Power Apps solutions to provide interactive business tools that complement Power BI reporting.
• Ensure seamless integration across Power BI, Power Automate, Power Apps, and other Microsoft 365 services.

4. Copilot & AI-Driven Reporting 

• Implement and configure Microsoft Copilot agents to enable AI-powered, natural language-driven analytics and user assistance.
• Integrate Copilot within Power BI and Fabric environments to enhance report creation and automation efficiency.
• Evaluate and deploy emerging AI-driven analytics features to improve reporting intelligence and user experience.

Experience:
Professional Experience: !!!

• Minimum 10+ years of experience in Power BI development, data modeling, and business intelligence reporting.
• Proven experience in Microsoft Fabric (Data Factory, Lakehouse, Warehouse, Pipelines,Data Agent).
• Hands-on experience with Power Automate and Power Apps for workflow and app automation.
• Practical knowledge of Azure data ecosystem (Data Factory, Synapse, Azure SQL).
• Experience in SAP BW integration and data extraction to Power BI or Azure environments is a strong advantage.
• Experience with AI/Copilot-enabled reporting and data automation concepts.

 
Technical Competencies:

• Advanced proficiency in Power BI, including DAX, Power Query (M language), and data modeling.
• Advance proficiency in MS Fabric
• Strong understanding of data warehouse concepts, ETL processes, and data governance.
• Proficiency in SQL, Azure services, and data performance optimization.
• Ability to design end-to-end reporting solutions from data source to visualization.
• Strong analytical and problem-solving skills with attention to detail.

FTE: Full-time (40 h per week)
Timeline: 3-6 months (tbd)
Start: ASAP
English: B2
Recruitment process: a tech check with our client, then an interview with the main client

The company
A well-established B2D (business-to-developer) SaaS platform operating at significant scale. Their product is infrastructure-level - real-time connectivity used by developers worldwide.

The team
~6–7 people: tech lead, PM, delivery manager, 3 web engineers + contractors. Small, tight-knit, opinionated. Standups Monday and Friday.

The role
One senior hire. This is a product-minded engineering role, not ticket execution. They’re shifting away from reactive delivery toward engineers who understand customers and drive outcomes.

Tech stack
React + TypeScript (frontend), Ruby on Rails (backend), some Node/TS services, Postgres.

What they’re looking for

• Developer empathy - you build tools for developers, you get the frustrations firsthand
• Product thinking - question requirements, propose what should be built
• Ownership - concept to shipped with minimal hand-holding
• Proactive communicator
• Comfortable with AI coding assistants (they use them actively)
• Design + UX intuition

Project: Legacy Modernization for an Insurance company
Location: Remote
Client Location: Germany
Engagement: Remote
Start: 3–4 developers could potentially start late September 

Project Overview
We are looking for experienced .NET / Azure Developers to join a legacy modernization project for a leading insurance company in Germany.
The project focuses on migrating and modernizing existing legacy code to a newer technology version while ensuring code quality, maintainability, and alignment with business requirements.

Requirements:

• Strong commercial experience with .NET
• Hands-on experience with Microsoft Azure
• Microsoft certification is required
• Insurance domain experience is very important
• Proven experience with legacy application/code migration and modernization
• Good knowledge of Git
• Practical experience with GitHub Copilot and understanding of AI-assisted development
• Ability to understand, analyze, and work with business and technical requirements
• Experience working in distributed/remote teams
• Good communication and collaboration skills

Language Requirements:

• German: minimum B1 or English B2
• Ability to work with German documentation is expected!!

We are looking for an experienced Android Developer to work on a project involving Android Enterprise, MDM and system-level functionality.
 

About the Project

The main goal is to develop two plugins for Headwind MDM:

1. A plugin for collecting information about mobile data usage by installed applications.
2. A FOTA (Firmware Over-The-Air) plugin for managing Android system updates.
    

Requirements

• Strong commercial experience with native Android development
• Strong knowledge of Kotlin / Java
• Experience with Android Enterprise
• Hands-on experience with Device Owner / Device Policy Manager (DPM)
• Understanding of MDM (Mobile Device Management)
• Experience developing platform-signed / privileged Android applications
• Experience with system-level Android functionality
• Good understanding of Android OS architecture
• English — B2+

Nice to Have

• Experience with FOTA / Android system updates
• Experience with AOSP
• Experience developing Android system applications or working close to the Android framework
   

Tech Stack

Kotlin, Java, Android, Android Enterprise, Device Owner, DPM, MDM, Platform-signed Apps, FOTA, AOSP, Headwind MDM

Requirements

• Strong commercial experience with .NET / C#
• Commercial experience with Vue.js
• Experience developing backend and frontend solutions
• Good understanding of REST APIs
• Experience working with databases and SQL
• Experience with Git
• Ability to work independently and as part of a development team
• Good English communication skills
   

Tech Stack

Backend: .NET, C#
Frontend: Vue.js, JavaScript / TypeScript
Database: SQL
APIs: REST

You will support the development and maintenance of the client's energy trading landscape. The team is responsible for all changes within the ETRM Allegro system, ranging from small enhancements to large feature implementations, as well as the handling and resolution of L3 incidents.

Must-Have Skills:

• 5+ years of experience in .NET development (C#, .NET Core / .NET 6+)
• Experience with ETRM systems, especially Allegro and/or Horizon
• Strong experience with microservices, APIs, and distributed systems
• Hands-on experience with Azure cloud services and AKS/Kubernetes
• Solid experience with SQL (T-SQL / PL-SQL)
• Experience with CI/CD pipelines, Git, and DevOps practices
• Strong understanding of modern software design principles and unit testing

Nice-to-Have Skills:

• Knowledge of the energy trading lifecycle
• Exposure to Agentic AI and spec-driven development
• Experience with reporting tools and integration patterns
• Strong analytical and problem-solving skills
• Ability to work in a cross-functional, agile environment
• Proactive mindset with a passion for modern engineering practices and continuous improvement
• Good communication skills and the ability to collaborate with business and technical stakeholders

Responsibilities:

• Handle L3 incidents and requests related to supported systems.
• Manage and implement changes and updates within the ETRM Allegro platform, including both small enhancements and larger feature developments.
• Oversee and support various Allegro modules and functionalities.

Tasks:

• Design, develop, and maintain scalable .NET applications using C#, .NET Core 6+, and modern software engineering principles including SOLID, Clean Architecture, and Domain-Driven Design (DDD).
• Build and enhance ETRM solutions (Allegro/Horizon) supporting the full trade lifecycle, including trade capture, scheduling, risk, and settlements.
• Develop and deploy cloud-native applications on Microsoft Azure, including Azure App Services, Functions-as-a-Service (FaaS), and containerized solutions using Docker and Kubernetes.
• Contribute to spec-driven development initiatives and explore Agentic AI / AI-assisted solutions where applicable.
• Create and maintain unit and integration tests to ensure high-quality and maintainable software.
• Collaborate with business stakeholders to translate requirements into technical solutions.
• Troubleshoot, optimize, and support distributed systems and cloud-based applications.
• Develop SQL queries, stored procedures, and reporting solutions.
• Follow DevOps, CI/CD, security, and engineering best practices.
• Participate in code reviews and promote cloud security and DevOps best practices.

Details:
Workload: Full-time
Location: 100% remote
Duration: 4 months (extension possible)
Language: English
Region: Offshore preferred; Nearshore also possible!

Workload: full-time, 40 hours per week
Start: asap but can be discussed
Duration: long-term
Location: any remote, preferably within ±3 hours of CET
English: B2-C1

We are looking for a highly capable AI-First Golang Team Lead Engineer to join a project where they'll build an AI tourism platform. This is not a traditional coding role. We don’t need coders; we need engineers who build features end-to-end using AI coding tools (Claude Code preferably!).

Details !!:
- CRITICAL: 2-3+ years of technical leadership experience leading a team, squad, pod, or similar unit (a hard must). Demonstrable experience of leading delivery within a team: coordinating, breaking work down, representing the team in planning and stakeholder conversations, facilitating outcomes.
- CRITICAL: Senior Golang Developer, 5+ years of experience
- CRITICAL: AI-first delivery: proven, demonstrable experience using Claude Code or similar agentic AI tools is a hard must (specific examples expected on the application).
- CRITICAL: Strong proficiency in English (Upper-intermediate level or Advanced)
- Hands-on engineering position
- Not a people-management role

You must have:
● 2-3+ years of technical leadership experience leading a team, squad, pod or similar unit (a hard must, think team lead or early-stage engineering manager)
● A developer's background (5 years minimum): you have seen production reality with your own hands before moving towards leading people
● A genuinely product-driven mindset: you think about user value and business outcomes before implementation
● Comfort facilitating and coordinating a pod without relying on formal authority
● Willingness and ability to take part in client meetings and act as the external face of your pod
● Excellent spoken and written English for planning sessions, stakeholder updates and client conversations
● Ownership mentality with a strive for elegantly simple, high-quality solutions; you test your own work thoroughly since we have no QA team
● Proven experience using Claude Code; share specific examples
● Solid Golang experience; you'll review AI's code, and you must understand how it works
● Ability to do on-call once in a while to help maintain our platform's reliability & uptime
●  European or African time zones (±3 hours from CET)
● Available full-time (40 hours/week). Must-Have Requirements (Team Lead — no flexibility on any)
● Go (Golang): Real production experience, not just personal projects. No flexibility on other technologies.
● AI/backend engineering: Deep knowledge of building and productionizing complex AI systems — observability, reliability, quality
● Product mindset: Ability to think beyond engineering toward product outcomes
● Leadership: Capable of leading without needing coaching or internal mentoring
● English communication: Very strong, given client-facing responsibilities
● Minimum 5 years of experience across the board
● Candidates should be responsible for testing their own code — QA ownership expected
● The Team Lead will head a small pod (not a traditional manager with direct reports)
● Client-facing responsibilities begin from onboarding, with full client-facing ownership expected to grow over time

Also, they will have on-call duties (now it’s during working hours and weekends, rotation among team members, but later they want to have 24/7 on call, so one person will be on-call for 24 hours (probably) and it will be compensated extra). Desirable skills (would be a benefit): Any special requirements for the person

Nice-to-Have
● German language: A significant bonus but not required — the one criterion the client can flex on

Here are requirements:
Bachelor's degree in Computer Science, Computer Engineering, or a related field.
5+ years of experience throughout the complete embedded software development lifecycle.
Experience with the following technologies is a strong advantage:
Texas Instruments (TI) processor families (CPU and DSP).
Hailo AI accelerators, including the Hailo SDK and toolchain.
Embedded Linux, including kernel, device drivers, and device tree configuration.
DSPs, FPGAs, or other AI acceleration technologies.
RK3588 System-on-Module (SoM) platforms.

Strong proficiency in C/C++ (modern C++ preferred) for embedded software development.
Deep understanding of modern operating systems (Linux and RTOS), networking/IP protocols, and hardware interfaces.
Experience with software configuration management tools (e.g., Git).
Solid experience with low-level debugging tools such as GDB, JTAG, and logic analyzers.
Strong analytical, troubleshooting, and problem-solving skills.

FTE: Full-time (40 h per week)
Timeline: 3-6 months (tbd)
Start: ASAP
English: B2
Recruitment process: a tech check with our client, then an interview with the main client

The company
A well-established B2D (business-to-developer) SaaS platform operating at significant scale. Their product is infrastructure-level - real-time connectivity used by developers worldwide.

The team
~6–7 people: tech lead, PM, delivery manager, 3 web engineers + contractors. Small, tight-knit, opinionated. Standups Monday and Friday.

The role
One senior hire. This is a product-minded engineering role, not ticket execution. They’re shifting away from reactive delivery toward engineers who understand customers and drive outcomes.

Tech stack
React + TypeScript (frontend), Ruby on Rails (backend), some Node/TS services, Postgres.

What they’re looking for

• Developer empathy - you build tools for developers, you get the frustrations firsthand
• Product thinking - question requirements, propose what should be built
• Ownership - concept to shipped with minimal hand-holding
• Proactive communicator
• Comfortable with AI coding assistants (they use them actively)
• Design + UX intuition

In this role, you will lead the design and delivery of cloud-native integration solutions for enterprise manufacturing systems. You'll work closely with Product Owners, Solution Architects, Site IT teams, and distributed engineering teams to build scalable, secure, and high-quality backend services on AWS.
This is a hands-on technical leadership role where you'll contribute to architecture, mentor engineers, perform design and code reviews, and help shape the technical direction of the platform.

What You'll Do

• Design scalable cloud-native backend architectures using Node.js and AWS.
• Lead the implementation of enterprise integration solutions based on microservices and event-driven architecture.
• Drive architectural decisions and ensure alignment with enterprise standards and best practices.
• Review solution designs, code, APIs, and technical documentation.
• Collaborate with Product Owners, architects, Site IT teams, and offshore development teams.
• Translate business and manufacturing integration requirements into reliable technical solutions.
• Guide engineering teams through implementation and technical challenges.
• Support project planning, effort estimation, and technical risk assessment.
• Ensure security, scalability, maintainability, and compliance across integration solutions.
• Act as the technical escalation point for complex architectural challenges.

Must-Have Skills

• 10+ years of professional software engineering experience.
• Strong commercial experience with Node.js backend development.
• Proven experience leading engineering teams or acting as a Technical Lead.
• Deep understanding of backend architecture and software design principles.
• Strong AWS experience, including cloud-native services.
• Experience with:
• Microservices
• Event-driven architecture
• REST APIs
• Amazon SQS
• Serverless architectures
• Kubernetes
• Hands-on experience with Infrastructure as Code (Terraform preferred).
• Experience designing secure, scalable, enterprise-grade applications.
• CI/CD experience (GitHub Actions or similar).
• Strong communication skills and experience working with distributed international teams.
• Fluent English.

Nice to Have

• Manufacturing or Industrial IT experience.
• OT/IT integration knowledge.
• AWS IoT Greengrass.
• Linux administration.
• Experience working in regulated environments (GxP).
• Pharmaceutical or Life Sciences background.

Tech Stack

• Node.js
• AWS
• Terraform
• Kubernetes
• Amazon SQS
• Microservices
• Serverless
• REST APIs
• Event-driven Architecture
• GitHub Actions / CI/CD