Kozak Agency

Backend Developer – Node.js / AWS / Cloudflare
We are looking for a Senior Backend Developer to join our team on a full-time basis.

Required Skills:
Node.js – Strong, proven experience
AWS – Lambda, S3, CloudFront, SQS (and related services)
Cloudflare – R2, CDN, Workers

Nice to Have / Advantages:
AWS MediaTailor
Video Streaming knowledge (HLS)
React (frontend basics)
Kubernetes (K8s)
Ad Server logic
VAST / oRTB protocols 

The project is primarily remote and offers a workload between 60% and 100%.

Your Responsibilities:
+ Develop core technical components for an MES (Manufacturing Execution System)
+ Example deliverables: message bus implementation, SDK (e.g., DB abstraction layer), generic archiving tool, configuration service
+ Collaborate with cross functional teams to define interfaces and integration points
+ Ensure high code quality, reliability and observability of microservices
+ Present and communicate technical designs, progress and trade offs to stakeholders (developers, architects and other teams)
+ Own and drive technical initiatives end to end (e.g., SDK development), including governance, standards, documentation and adoption

Requirements:
MUST:
+ Senior-level expertise, with at least 5 years of experience in C# /.NET development.
+ Strong skills in Angular for frontend implementation
+ Deep understanding of microservice architectures, including design and implementation of distributed systems
+ Proficiency in SQL and working with relational database systems
+ Strong technical mindset with excellent analytical and problem‑solving abilities
+ Proven hands‑on experience in building and operating performance‑critical and reliability‑critical microservices as well as core MES components, ensuring low latency, high throughput, and robust fault tolerance in production environments
+ Primary focus on backend development and microservices (architectural experience is a plus)
+ Very good German and/or English language skills.

NICE TO HAVE:
+ Experience in architecture and system design
+ Proficiency with Kubernetes (K8s)
+ Hands-on experience with Apache Kafka
+ Knowledge of Redis
+ Experience with APISIX or a comparable API gateway solution
+ Strong skills in Docker and containerization
+ Experience building and maintaining CI/CD pipelines (preferably using Azure DevOps)
+ Practical experience implementing Security by Design (threat modeling, secure coding, authn/authz, encryption, secrets management, CI/CD security)

We are looking for a Software Engineer to join our Application Platform team to help us with a cloud migration project for our subsidiaries. Application Platform provides a range of cloud products for product teams in the company, and our goal is to enable our users to derive maximum value from our products in a self-service manner, operating on a ‘You Build it, You Run it’ model. We provide an integrated AWS platform that hosts over one thousand services on EKS and Serverless environments, serving 1 billion viewer requests daily. We manage CI/CD infrastructure hosted on Jenkins & JFrog which hosts over 90 pipelines. Our product teams monitor and observe their applications using Datadog.

Hard skills:
• Working experience in TypeScript with Node.js and Java with Spring Boot.
• Proficiency in working with PostgreSQL.
• In-depth experience with Docker, networking, and Linux servers.
• In-depth knowledge of Amazon Web Services and interacting with their services and API, for example knowledge in some but not all: CDK, Lambda, RDS, ALB, EC2.
• Ability to create and consume REST APIs.

Soft skills:
• Pragmatism with an eye on how to simplify complex systems
• A product mindset
• Ability to drive technical decisions, to explain technical decisions and details at varying levels of abstraction (including other engineers and management)
• Be a mentor and share your knowledge with colleagues

Bonus qualifications:
• Familiarity with Tomcat, .NET, or PHP is a plus.
• Experience with PostGIS is nice to have.
• Being able to read Vue.js code can help with some of the projects.
• An understanding of SOAP helps with migrating some of the legacy services.

Example projects:
• Dockerize an existing service that has production load running on a VPS and deploy the new Dockerized version in a new managed Kubernetes environment.
• Move a PostgreSQL database currently running on a VPS to AWS RDS and migrate data with minimal downtime.

Project language: English
Project start: asap
Project duration: 9 MM - Fulltime 
Location: remote

Location: European Union only
English Level: Minimum B2
Start Date: ASAP
Duration: long-term
Workload: Full-time

Core Requirements:
• 5+ years of software development experience (SaaS / product environment preferred)
• Strong hands-on coding background (daily development involvement)
• Strong expertise in Python / Django (backend architecture)
• Solid production experience with AI, including: LLM integration and orchestration, AI agents / agentic systems. Advanced use of AI APIs (OpenAI, Hugging Face, etc.)
• Experience with data architecture and pipelines
• Cloud experience (GCP preferred; scalability and migration)
• Understanding of performance, security and scalable systems
• Experience with testing, CI/CD and monitoring best practices

Current Tech Stack:
Backend: Python / Django
Frontend: React / Next.js
Hosting: Heroku (migration to GCP planned)
Storage: Google Cloud Storage
AI: OpenAI API
Monitoring: Sentry

Role Focus (Next 6–12 Months)
Deployment of personalized AI agents at scale
Strengthening data & AI architecture
Refactoring and improving existing features
Supporting and scaling a 5–6 person tech team

 

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

We are looking for a Middle/Senior DevOps Engineer with experience with Azure and Terraform
Work mode: Fully Remote
Working language: English
Can be part time
Start: ASAP

We offer:

• Cooperation with a stable company with well-established processes and a positive atmosphere
• Experience in project management of different levels of complexity, methodology, and approaches
• Flexible schedule: Mon-Fri (8 hours a day)
• 18 days of paid vacation; 15 days sick leave
• A decent level of remuneration with regular reviews of the results of cooperation
• Extensive loyalty program 

We’re currently looking for a Amazon Connect engineers to join our project.

The Amazon CX Senior Engineer leads the design, implementation, and optimisation of complex full-stack Amazon Connect solutions. This position requires deep technical expertise to guide customers through sophisticated contact centre transformations.

Qualifications:
4+ years of experience in technical implementation or consulting roles
Amazon Connect Communications Specialist
Amazon Connect Developer Specialist
At least one AWS Foundation level certification
At least one AWS Associate level certification

Nice to have:
Experience building in Amazon Connect console
Strong Python or JavaScript programming skills
Advanced experience with infrastructure as code using CDK or Terraform
Integration patterns with external systems
CI/CD pipeline implementation for contact centre solutions
Performance optimisation and scaling strategies
Security architecture for contact centre solutions
Custom development to extend Amazon Connect functionality

We are looking for a Senior Drupal Developer (E-Catalog Platform)

Tasks:
Development of an e-catalog platform (not e-commerce)
Design and implementation of a 3-level entity hierarchy (Systems → Families → Components)
Analysis and modelling of data structure with dependencies between entities
Implementation of dynamic filters with parameter-based count updates
Development of product/family comparison functionality
Implementation of advanced search functionality (e.g. Algolia / Elasticsearch based)
Organisation and maintenance of structured file management (downloadable materials, version control)
Ensuring correct data processing and navigation logic
Performance optimisation for pages with large media content (images / video / 3D models)
SEO structure optimisation and navigation hierarchy adjustments
Integration of authentication systems
Integration of chat / AI agents
Further development and optimisation of the platform
Iterative development with future scope extensions

Skills:
Must Have
Senior Drupal 9/10 developer – backend focused
Strong experience with complex catalog structures (custom entities, taxonomy, relationships)
PHP 8+
Database skills (MySQL / MariaDB)
Experience with search engines (Elasticsearch or Algolia)
Experience with dynamic filtering (faceted search)
Strong analytical skills – data modelling
Experience in file/media management at scale
Performance optimisation experience

Nice to Have
Headless architecture experience (Drupal + React / Next.js)
Product builder / configurator experience
AWS infrastructure knowledge (EC2, S3, CDN)
AI integration experience
Industrial / technical product domain experience
 

Tasks:

• Migration of existing jobs from the legacy system to the new system
• Analysis and understanding of existing job logic
• Implementation of the transformation into the new system
• Ensuring correct data processing
• Development and further development of the new data platform
• Requirements management / maintenance and optimisation

Skills:
Must Have

• C# .Net developer - ideally backend rather than front end
• AWS & Infrasturcture, with experience in EC2, ECS, S3 and Lambda
• Good analytical skills - Data
• ETL understanding
• SQL Server/Database skills

Nice to have:

• Winforms experience
• Azure Dev Ops pipelines
• Trading domain knowledge
• AI experience : integrating with Data or Tooling
• VB6 (any handson exp)

Details:

• Start: asap
• Duration: 10 MM+ (option for extension) (10 месяцев минимум)
• Workload: Fulltime
• Location: Completely remote possible. Otherwise Essen by arrangement
• Language English fluent

Duration: 6+ months

We need a strong BA with trading experience for the Discovery Phase, AI-Assisted approach for documentation creation using Spec-kit or BMAD frameworks, and excellent knowledge in trading sphere.

Hard skills requirements (including years):

• 5+ years of experience working as a business analyst; preferably within a software development environment.
• Experience with AI-Assisted documentation creation flow (using BMAD / Spec-kit frameworks)
• Strong experience in Trading domain: assets, strategies, etc.
• Comprehensive knowledge of business analysis, requirements management, and Agile delivery principles.
• Proven experience in eliciting and documenting requirements in the form of user stories, use cases, and functional specifications.
• Ability to create comprehensive software requirements specifications (SRS).
• Strong grasp of software architecture, including Web applications, and a deep understanding of software/systems (UML).
• Proficiency in modeling business processes, knowledge of notations and methodologies (BPMN).
• Ability to interpret, structure, and clarify complex information into clear, actionable requirements.
• Experience leading workshops to gather requirements, build solutions, and present features.
• Excellent communication skills.

Key responsibilities:

• Lead structured workshops and maintain regular communication with stakeholders and the development team to gather, clarify, and document business and technical requirements.
• Investigate existing proof of concepts and relevant documentation to deliver comprehensive analyses of product positioning, target users, and competitive landscape.
• Translate business needs into detailed product structures, user stories, and use cases, while defining the MVP’s functionality, epics, and roadmap aligned with business goals.
• Collaborate with UX designers or independently create dynamic, interactive prototypes (preferably in Axure RP) to visualize and refine user journeys and feature flows.

We are currently seeking an experienced TypeScript Developer (m/f/d) for a challenging project with one of our clients. Below are the full details:

Key Technologies and Requirements:
The ideal candidate will have solid experience with the following technologies and tools:

• TypeScript: Strong proficiency in writing scalable, maintainable, and efficient code.
• React: Experience in building dynamic and responsive user interfaces with React.
• Module Federation: Knowledge of implementing module federation for efficient sharing of modules across applications.
• Nest.js: Expertise in using Nest.js to build server-side applications.
• Go (Golang): Practical experience in Go for developing backend services.
• GitLab CI/CD Pipelines: Proficiency in setting up and managing continuous integration and continuous deployment pipelines in GitLab.
• Terraform: Hands-on experience in automating infrastructure using Terraform.
• Serverless on AWS: Experience working with serverless services in AWS, including Lambda for serverless computing and DynamoDB for scalable NoSQL databases
• TypeScript,
• React,
• Module Federation,
• Nest.js,
• Go,
• GitLab CI/CD pipelines,
• Terraform, and hands-on experience with serverless services on AWS, including Lambda and DynamoDB.

General Information:

• Start Date: April 26th
• Utilisation: Full-time (FT)
• Duration: 6+ months
• Location: Remote (EEA Located - European Economic Area)
• Project Language: English

We are looking for an experienced Senior PHP Software Engineers with 5 years of experience, strong full-stack capabilities (React) to join a product engineering team building and scaling a high-performance payments ecosystem platform.

Our client is a US-based company, with 20+ years on a market. The client is launching a new product as an extension of an established enterprise payments ecosystem used by partners and merchants across multiple industries. The goal of the project is to build a modern, unified partner/merchant portal and platform that consolidates the currently fragmented experience across multiple NMI sites, including both the CRM-facing environment and the payment gateway/processing environment.

Today, customers often need to log in to different systems depending on the features they use, which creates a disjointed user experience, and this initiative is intended to “marry” those capabilities into one seamless platform.

The solution is expected to be API-first and integration-friendly, designed for enterprise-grade reliability, security, and performance. It will likely include modules such as partner and merchant onboarding, configuration and administration portals, payment orchestration and integrations, and analytics/reporting. The platform should be scalable and modular, allowing it to evolve over time and be broadly adopted across the wider ecosystem.


Requirements:

• Experience: Minimum 3+ years (Middle) or 5+ years (Senior) of experience developing complex software applications in an agile environment
• PHP expertise: Advanced proficiency in PHP, with strong understanding of object-oriented design principles and modern PHP patterns
• Laravel proficiency: Extensive experience with Laravel framework; familiarity with other frameworks (e.g., Symfony) is a plus
• Frontend skills: Comfortable building rich web experiences using React; Experience working with Inertia.js for building modern SPA-like applications
• GraphQL & APIs: Hands-on experience designing and consuming GraphQL APIs; strong background with REST/Web APIs; Experience working with Apollo Client (or similar GraphQL clients); Experience with Rebing GraphQL framework.
• Microservices & SaaS: Experience working in microservice architectures and multi-tenant SaaS systems in production.
• Database: Strong SQL skills (especially MySQL), performance tuning, indexing, schema design.
• Code quality & engineering practices: Experience with static code analysis and code quality tools such as PHPStan and SonarQube; Strong focus on maintainable, testable, and well-structured code
• Engineering maturity: Great debugging skills, strong sense of data security and privacy, and ability to deliver robust solutions under uncertainty.
• Communication & Collaboration: Experience working effectively with remote and cross-functional teams without a project manager, strong problem-solving and communication skills; Experience working with JIRA for task tracking, backlog management, and collaboration
• Hands-on experience with agentic AI development tools (AI agents, workflow automation,semi-agentic decisions)
• English level: Upper-Intermediate

Nice-to-Have:

• Experience with cloud environments (AWS, GCP, Azure).
• Familiarity with payment processing systems, PCI compliance, or fintech workflows.
• Experience contributing to system design decisions and performance optimization at scale.
• Experience with Docker, Kubernetes, CI/CD pipelines, and automated testing.
• Familiarity with monitoring and logging tools (e.g., Datadog, New Relic, Logz.io)

Project: Multi‑Agent AI System in the Automotive Sector
 Location: 100% Remote (On-site onboarding in Munich possible)
 Workload: Full-time (100%)


Project Context
A strategic AI initiative in the automotive sector aims to transform an existing single-agent prototype into a robust, production-ready multi-agent vehicle configurator within a Microsoft/Azure-based enterprise environment.
 Focus is on designing a scalable and secure multi-agent architecture with defined orchestration, deterministic behavior, high performance (<2–4 sec latency), and enterprise-grade integration.

Project Objectives

• Build a multi-agent architecture (orchestrator + specialized agents)
• Prepare a production-ready Azure implementation
• Achieve performance targets (<2–4 seconds latency)
• Implement guardrails & prompt-injection protection
• Ensure clean API integrations and orchestration
• Establish enterprise-level observability, security & monitoring

Responsibilities
The Senior AI Engineer will take a leading architectural and hands-on implementation role:

1. Refactor the existing single-agent prototype into a multi-agent system
2. Design and document a structured orchestration graph
3. Implement strict tool permissioning and scope control
4. Manage deterministic loops, retries, and fallback logic
5. Build a robust session & state model
6. Integrate external APIs with resilient error handling
7. Implement telemetry & monitoring hooks across agents
8. Optimize latency and reduce unnecessary tool calls
9. Implement guardrails (prompt-injection prevention, output validation)
10. Communicate architectural decisions clearly to stakeholders

Technical Requirements (Must-Have)
Core AI / LLM Engineering

• Function Calling, JSON Schema outputs
• Multi-agent system design (orchestrator + experts)
• Retry logic, fallback strategies, healing loops
• Guardrails: prompt-injection protection, scope control, output validation

Backend Engineering

• Python (ideally FastAPI), Async IO, Pydantic
• Production-grade API design (timeouts, retries, logging, error handling)
• Versioned schema & interface contracts
• Multi-API integrations with robust error-handling patterns

Azure Production Setup

• Azure Foundry
• Managed Identity
• Key Vault
• Log Analytics / Application Insights
• Understanding of private endpoints, API Gateway & enterprise security
• Solid grasp of enterprise deployment & monitoring practices

Architecture & Systems Thinking

• Orchestration graph design & documentation
• Session/state model concepts
• Latency budgets, performance awareness
• Ability to determine when deterministic logic > LLM-based logic

Nice-to-Have

• MCP experience
• Constraint systems
• Recommendation systems

Candidate Requirements

• Senior-level experience in AI engineering
• Strong system and architecture thinking
• Ability to document complex relationships clearly
• Previous experience in near-production enterprise environments
• Clear, precise communication

Soft Skills

• Structured, analytical working style
• High personal responsibility
• Architecture-driven, solution-oriented mindset
• Strong communication with technical & non-technical stakeholders

Start: asap (by the 9th of March)
Duration: long-term, by the end of 2026, with possible prolongation
Language Requirement: Fluent in English (spoken and written)

Requirements:
We are seeking a Data Engineer – Professional 2 to contribute to the development and delivery of modern data products in close collaboration with domain teams and cross-functional stakeholders.
This role is focused on hands-on implementation within a managed service setup. The consultant will support the building, governing, and operating of data products across the lifecycle, from ingestion to serving, while working under defined standards and guidance from senior team members.

Engagement Model
This is a managed service engagement.
We are procuring a cohesive delivery package from one supplier, not individual consultants from multiple vendors.
The supplier is accountable for service delivery, competence coverage, continuity, and performance at the service level.
Suppliers responding to this request must also respond to the two associated requests. Partial submissions will not be considered.
The assignment follows an output-driven delivery model.
Delivery offered and accepted per Program Increment (10-week setup cycle).
All consultants must be physically located within the EU due to regulatory data-sharing requirements.


Scope of Work
Build Data Products
 

• Source-aligned data products with domain teams in cross-functional teams.
• Analytical data products for BI, ML, and AI use cases in cross-functional teams.

Deliverables:
Source-aligned and analytical data products, including defined data contracts, documentation, SLAs, and runbooks.
Work According to Standards and Reusable Patterns
 

• Work according to and provide feedback on data contracts, modeling patterns, testing strategies, CI/CD pipelines, and golden paths.
• Contribute to reusable templates and shared libraries.

Deliverables:
Deliveries aligned with defined best practices.
Structured feedback and improvement proposals when standards or patterns are not functioning as intended.

Enable Domain Teams

• Work in cross-functional teams to bootstrap ownership, standards, and tooling.
• Support transition of ownership to domain teams when feasible.
• Perform pair-programming and structured collaboration.

Deliverables:
Pair-programming sessions and active cooperation with domain teams.
Structured knowledge transfer to enable sustainable ownership.
Professional Operations for Owned Products
 

• Ensure production-grade lifecycle management from ingestion to serving.
• Cover data quality, governance, lineage, SLA adherence, cost control, and observability.

Deliverables:
Monitoring of metadata, lineage, health, cost, and usage of delivered data products.

Out of Scope
The managed service team will not:

• Operate the Data Mesh platform, IAM, or observability stack. Responsibility remains with IXA.
• Own or operate operational systems of record. Responsibility remains with domain teams.
• Build dashboards or develop ML models. Responsibility remains with KDBDA/B.

Required Technical Competence

• 1–2 years of experience in Data Engineering.
• Minimum 1–2 previous assignments.
• Mandatory proven delivery of pipelines and data products on:

x AWS
x Snowflake
x dbt
x Azure
x Witboost
x Dreamio
 

• Proficiency in dbt and modern ELT/ETL practices.
• Experience with CI/CD and automated testing in data environments.
• Familiarity with Data Mesh environments.
• Familiarity with DataOps principles in production environments.
• Basic understanding of data governance, data contracts, and modeling patterns.

Personal Competencies

• Strong willingness to learn and develop within a managed service context.
• Ability to operate in an output-driven delivery model.
• High technical credibility and structured problem-solving ability.
• Strong collaboration skills in cross-functional and distributed teams.
• Proactive, quality-oriented, and improvement-driven.

Additional Information

• As an approved exception for this specific managed service request, the standard CV template requirement does not apply. Suppliers may submit their own CV format for this assignment.
• All consultants must be located within the EU due to regulatory data-sharing requirements.
• All interviews will be conducted remotely.

We’re looking for a Full-Stack Engineer (PHP/Laravel, React) for a short-term project lasting from 2 weeks to 3 months. It will start as a full-time engagement and then transition to part-time.

Details: 
Senior Full-Stack Engineer (PHP/Laravel, React) with 8 years of experience.
Strong proficiency in English (Upper-intermediate level or Advanced).
Fully remote
Location: Ukraine or Europe.
Start: ASAP!

Experience / Skills

• At least a Bachelor's with a background in tech or equivalent, based on work experience
• 8 years!!! of work experience with the Laravel and React frameworks
• Experience building applications with JavaScript/Typescript, PHP, HTML5, CS,S and MySQL 8
• Passionate about usability, user experience, beauty, and elegance of UI's
• Eager to learn, discuss, and share knowledge with the rest of the teams
• Nice to have: knowledge of Kubernetes, Docker, and other tools used in DevOps
• Absolute fan of TDD and CI/CD pipelines
• Strong track record of leading technical projects and coordinating teams of 3+ engineers
• Experience mentoring and supporting the professional growth of fellow engineers
• Background in product-based companies with multiple products and engineering teams
• Proven track record of driving engineering initiatives that impacted other teams or the wider organization
• Excellent presentation and communication skills, with the ability to clearly explain technical concepts and join customer calls when needed