Kozak Agency

Joined in 2023
48% answers
We are a rapidly expanding software development company with almost 40 talented developers specializing in web development, mobile development, and cloud-based solutions.

Our firm expertise encompasses a wide range of contemporary web and mobile development tools. The most frequently demanding and widely used out of a list of our tech instruments are JavaScript and its modern frameworks, Node.js-based tools and frameworks, relational and non-relational databases, cloud computing platforms, mobile development languages and frameworks.

As the company thriving to meet the most distinctive client necessities we are extremely flexible in terms of development and provide a broad spectrum of development services onwards from turn-key basis solutions to uniquely tailored client requests.

Nowadays, in the comprehensive range of numerous industry fields, we have been attempting to diversify our portfolio with previously unexplored realms of activity.

The list of fields we already possess rock-solid expertise includes finance, education, healthcare, marketplaces, social networks, legal services, real estate, logistics and transportation, energy and utilities, blockchain, and others.

Throughout a period of our decently long journey, we as the company successfully developed and launched over 100 web products and brought unforgettable experience to plenty of end users.

The geography of customers embraces a significant part of the world globe: US, UK, Israel, EU, Australia, Canada are amongst the most common ones.

Kozak Agency company this is a friendly environment for professionals and also a great web development community.
There is a cozy space where we can arrange our meetings and team buildings.
We believe that a high level of communication is an important part of people's success and strong partnerships.

Looking forward to hearing from your CV!
Join our team and become a new part of our community.
  • · 205 views · 71 applications · 9h

    Frontend-Developer (React)

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    Frontend-Developer (React) for client (German multinational energy enterprise) We are looking for a strong Frontend-Developer with expertise in React. Start: asap Duration: 6 months + option for extension Workload: Full-time Location: 100%...

    Frontend-Developer (React) for client (German multinational energy enterprise)

    We are looking for a strong Frontend-Developer with expertise in React.
    Start: asap
    Duration: 6 months + option for extension
    Workload: Full-time
    Location: 100% Remote/Offsite; no Onsite
    Project language: English

    More
  • · 38 views · 15 applications · 9h

    Senior Full Stack Developer (Angular and NestJS)

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    We are looking for a skilled fullstack developer to support the further development of a production-grade web application. The stack includes Angular (latest version) as the frontend framework, NestJS for the backend, MariaDB as the database, and Keycloak...

    We are looking for a skilled fullstack developer to support the further development of a production-grade web application. The stack includes Angular (latest version) as the frontend framework, NestJS for the backend, MariaDB as the database, and Keycloak for authentication and authorization. We use TypeORM for data access.

    Responsibilities:

    • Build and maintain Angular components (standalone components, Signals)
    • Extend and improve REST APIs using NestJS
    • Manage the MariaDB database schema and migrations using TypeORM
    • Implement and maintain Keycloak-based authentication, including role-based access control
    • Write end-to-end tests using Playwright or Cypress
    • Ensure high code quality and contribute to technical documentation


    Requirements:

    • Strong experience with Angular (v16 or newer), including Signals
    • Proficiency with NestJS and modular backend architecture
    • Solid TypeScript knowledge
    • Hands-on experience with MariaDB and TypeORM
    • Real-world experience integrating Keycloak into fullstack apps
    • Experience with Playwright or Cypress for end-to-end testing
    • Familiarity with Docker, Git, and CI/CD pipelines


    Project Info:

    • The application is already live and actively used
    • Tasks are well-defined and managed via GitHub
    • Collaboration with an internal development team
    • Modern, containerized infrastructure
    • We’re looking for someone who can get started soon. If the collaboration works well, long-term cooperation is possible.
    More
  • · 17 views · 2 applications · 3d

    Senior AI/ML Engineer

    Full Remote · Countries of Europe or Ukraine · 3 years of experience · English - B2
    We’re looking for an Applied AI Engineer who combines strong ML fundamentals with the discipline of improving production AI systems through metrics, evaluation, and iteration. Details: Senior AI/ML Engineer, ideally 5 years of experience. Ready to...

    We’re looking for an Applied AI Engineer who combines strong ML fundamentals with the discipline of improving production AI systems through metrics, evaluation, and iteration.

    Details:
    Senior AI/ML Engineer, ideally 5 years of experience. Ready to consider candidates starting with 3 years of experience, but they must be very strong in AI/ML.
    Strong proficiency in English (Upper-intermediate level or Advanced)
    Full-time
    Location: any
    Start: ASAP!

    The role in a nutshell
    You’ll work on improving production AI systems through evaluation, experimentation, and system design.

    A large part of the role involves:

    diagnosing failures in agent workflows
    designing evaluation metrics and KPIs
    improving system prompts and agent behavior
    running structured experiments and measuring impact
    You won’t be working in isolation on research projects — you’ll be improving systems that real users depend on.

    Rough responsibility breakdown:

    AI evaluation and KPI design — ~30%
    Prompt and agent system design — ~30%
    ML systems (recommendation, optimization, etc.) — ~30%
    Engineering integration — ~10%

    What you’ll work on:

    AI evaluation and system quality

    Design evaluation strategies for LLM and agent workflows
    Create metrics and KPIs for AI system performance
    Build and maintain evaluation datasets
    Debug production AI failures systematically
    Compare system behavior against baselines
    This is a core responsibility of the role.

    Multi-agent AI systems

    Improve agent orchestration and workflows
    Diagnose failures across agent pipelines
    Refine system prompts and agent interactions
    Improve reliability, latency, and response quality of ML and AI systems

    You’ll contribute to areas such as:

    Recommendation systems (ranking and personalization)
    Itinerary optimization and constraint-based planning
    LLM-based reasoning systems
    Optional: computer vision pipelines
    Depth in one of these areas is more important than superficial experience in all of them.

    Engineering collaboration
    We use:

    Golang (primary production language)
    Python when necessary for ML workflows
    Postgres, Redis, and internal services
    You don’t need to be a Go expert on day one, but you should be comfortable reading and modifying production code.
    Backend engineers handle infrastructure-heavy service development — your focus is on AI system behavior and correctness.

    What we’re looking for
    Must-haves
    1. Strong AI/ML fundamentals
    You understand the theory behind what you build and can choose appropriate methods for a problem.
    Examples:

    evaluation metrics (precision/recall/F1/etc.)
    ranking and recommendation concepts
    embeddings and similarity
    experimentation methodology

    Not required:
    academic publications
    advanced theoretical math
    large-scale model training experience

    2. Evaluation-driven mindset You:

    think in metrics and baselines
    design experiments instead of guessing
    measure system improvements quantitatively
    debug failures methodically
    This is the most important signal for the role.

    3. Experience with LLM systems you’ve worked with:

    prompt design
    agent workflows
    evaluation of LLM outputs
    production LLM integrations

    4. Ability to ship production systems
    You can:

    turn ideas into working systems
    iterate based on results
    balance exploration with delivery

    5. Programming ability You’re comfortable writing production code in at least one language (Python, Go, or similar) and learning others when needed.

    Strong signals (nice to have)
    Experience improving an AI system after deployment
    Recommendation systems or ranking experience
    Optimization or constraint-based systems
    Computer vision experience
    Experience building evaluation frameworks
    Golang experience
    Startup or small-team engineering experience

    More
  • · 54 views · 4 applications · 3d

    DevOps Engineer

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    Responsibilities Deployment and maintenance of production Kubernetes clusters (Kubespray) Ensuring High Availability (HA) for control plane, etcd, and stateful services IAM and security management (Keycloak, RBAC, Network Policies) Setup and maintenance...

     

    Responsibilities

    • Deployment and maintenance of production Kubernetes clusters (Kubespray)
    • Ensuring High Availability (HA) for control plane, etcd, and stateful services
    • IAM and security management (Keycloak, RBAC, Network Policies)
    • Setup and maintenance of monitoring, logging, and alerting systems
    • Support of development environments (Minikube)
    • Incident response and participation in platform stability improvements
       

    Requirements

    Must have:

    • Strong hands-on experience with Kubernetes in production environments
    • Practical experience with Kubespray
    • Docker / containerd
    • Experience with stateful workloads (PostgreSQL, Redis)
    • Helm, Git, Bash
    • Monitoring stack experience (Prometheus, Grafana)
    • Solid understanding of Kubernetes networking (Ingress, Services, NetworkPolicy)
       

    Nice to have:

    • Experience with Keycloak (OIDC, LDAP, RBAC)
    • Experience with Longhorn or Rook-Ceph
    • Experience with EFK stack (Fluentd, Elasticsearch, Kibana)
    • Experience with HashiCorp Vault
    • Experience with MinIO / S3-compatible storage
    • Understanding of SRE practices (SLA / SLO principles)
    More
  • · 39 views · 7 applications · 4d

    Data Engineer (Python / SQL)

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    Requirements • Strong proficiency in SQL • Solid experience with Python • Commercial experience as a Data Engineer / Python Developer • Hands-on experience with data migration and database processes • Ability to work independently and ensure data...

    Requirements
    • Strong proficiency in SQL
    • Solid experience with Python
    • Commercial experience as a Data Engineer / Python Developer
    • Hands-on experience with data migration and database processes
    • Ability to work independently and ensure data consistency
    • English: B2+

    • Duration: 3–5 months
    • 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 

     

    More
  • · 61 views · 13 applications · 5d

    Fullstack React, NET, Azure Developer

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    Strong focus on React (around 70%) with additional experience in .NET and Azure (around 30%). We’re looking for a Middle+ to Senior level engineer who is confident on the frontend side and comfortable working with backend services and cloud...

    Strong focus on React (around 70%) with additional experience in .NET and Azure (around 30%).
     

    We’re looking for a Middle+ to Senior level engineer who is confident on the frontend side and comfortable working with backend services and cloud infrastructure.
     

    Ready to start quickly.

    More
  • · 84 views · 15 applications · 7d

    Senior React Native Developer

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    Preferably with experience in apple/google TV apps. We already have and Android and iOS apps with video content, and we need to extend them to Apple TV and Google TV without distracting the core team. We’re building these TV apps because we plan to...

    Preferably with experience in apple/google TV apps.

    We already have and Android and iOS apps with video content, and we need to extend them to Apple TV and Google TV without distracting the core team.

    We’re building these TV apps because we plan to apply for the Apple and Google video programs.

     

    application process via test task and then interview with head of engineering

    More
  • · 47 views · 6 applications · 11d

    AI-First Golang Developer

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    We don't need coders, we need Golang backend engineers who build features end-to-end using Claude Code. Details: • AI coding experience (mandatory!): experience with Claude Code - #1 priority, or other agentic coding tools. Claude Code is what is used on...

    We don't need coders, we need Golang backend engineers who build features end-to-end using Claude Code.

    Details:
    • AI coding experience (mandatory!): experience with Claude Code - #1 priority, or other agentic coding tools. Claude Code is what is used on the project
    • Senior Golang Developer, 5+ years of experience, can potentially consider really strong candidates with 4 years of experience
     • Strong proficiency in English (Upper-intermediate level or Advanced)
     •
     • Full-time
     • Fully remote
     • Start: ASAP!
     • Duration: long-term

    Sharing more details about the responsibilities and requirements below.

    What you'll actually do:
     • Own features end-to-end: from specs to deployment to fixing bugs
     • Use Claude Code to generate Golang backend code
     • Review AI output for quality and architectural fit
     • Fix bugs to learn our codebase, then rapidly build new features
     • Make quick decisions on what to build vs buy vs generate with AI
     • Talk to customers when they report issues and ship fixes same day

    Our stack:
     • Backend: Golang monorepo
     • AI: Claude Code (mandatory), other agentic coding tools

    Products you will build:
     • API: platform features, tooling, multi-agent system, etc.

    You must have:
     • Ownership mentality with a strive for elegantly simple, high-quality solutions
     • Strive for max quality - you test your own work thoroughly since we have no QA team, everything you ship MUST work
     • Product mindset - you care about WHY we're building something
     • Proven experience using Claude Code or similar agentic AI (Cursor, Windsurf)
     • Strong Golang experience - you'll review AI's code in these, and you must understand how it works
     • Broad architectural knowledge of building backened

     

    More
  • · 32 views · 8 applications · 13d

    Full-Stack SvelteKit Frontend, Golang Backend Developer

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    We are looking for an AI-First Product Engineer (Full-Stack): SvelteKit Frontend, Golang Backend. We don't need coders, we need engineers who build features end-to-end using Claude Code. Without any "hand-coding". Details: • AI coding experience...

    We are looking for an AI-First Product Engineer (Full-Stack): SvelteKit Frontend, Golang Backend. 
    We don't need coders, we need engineers who build features end-to-end using Claude Code. Without any "hand-coding".

    Details:
    • AI coding experience (mandatory!): experience with Claude Code - #1 priority, or other agentic coding tools. Claude Code is what is used on the project
    • Senior Full-Stack Engineer (SvelteKit Frontend, Golang Backend), 5+ years of experience, can potentially consider really strong candidates with 4 years of experience
     • Strong proficiency in English (Upper-intermediate level or Advanced)
     • Full-time
     • Fully remote

    Sharing more details about the responsibilities and requirements below.

    What you'll actually do:
     • Own features end-to-end: from specs to deployment to fixing bugs
     • Use Claude Code to generate SvelteKit frontend and Golang backend code
     • Review AI output for quality and architectural fit
     • Fix bugs to learn our codebase, then rapidly build new features
     • Make quick decisions on what to build vs buy vs generate with AI
     • Talk to customers when they report issues and ship fixes same day

    Our stack:
     • Frontend: SvelteKit, turbo monorepo, Vercel
     • Backend: Golang monorepo
     • AI: Claude Code (mandatory), other agentic coding tools

    Products you will build:
     • API: platform features, tooling, multi-agent system, etc.
     • UIs: internal UIs, B2B dashboards, B2C web apps

    You must have:
     • Ownership mentality with a strive for elegantly simple, high-quality solutions
     • Strive for max quality - you test your own work thoroughly since we have no QA team, everything you ship MUST work
     • Product mindset - you care about WHY we're building something
     • Proven experience using Claude Code or similar agentic AI (Cursor, Windsurf)
     • Strong SvelteKit and Golang experience - you'll review AI's code in these, and you must understand how it works
     • Broad architectural knowledge of building modern full-stack applications
     • Excellent spoken English and a good internet connection for daily video calls

    You are a great fit if you:
     • Get frustrated when development takes weeks instead of days
     • You think in features and architecture and not single lines of code
     • Can spot subtle bugs in AI-generated code quickly
     • You ship fast but always verify it actually works
     • Have shipped real products that customers actually use
     • Think "how can AI build this?" as your first instinct

    Red flags (don't apply if):
     • You've never used Claude Code or similar AI coding tools
     • You're a perfectionist who loves to code
     • You need detailed specs before starting
     • You see AI as a threat rather than leverage
     • You're outside European/African time zones

    More
  • · 96 views · 18 applications · 13d

    Senior React Native Developer

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    Preferably with experience in apple/google TV apps. We already have and Android and iOS apps with video content, and we need to extend them to Apple TV and Google TV without distracting the core team. We’re building these TV apps because we plan to...

    Preferably with experience in apple/google TV apps.

    We already have and Android and iOS apps with video content, and we need to extend them to Apple TV and Google TV without distracting the core team.

    We’re building these TV apps because we plan to apply for the Apple and Google video programs.
     

    the project is outstaff for roughly 4 months
     

    application process via test task and then interview with head of engineering

    More
  • · 57 views · 11 applications · 21d

    AI-First Product Engineer (Full-Stack) SvelteKit Frontend, Golang Backend

    Full Remote · Countries of Europe or Ukraine · 5 years of experience · English - B2
    We don't need coders, we need engineers who build features end-to-end using Claude Code. Without any "hand-coding". Details: • AI coding experience (mandatory!): experience with Claude Code - #1 priority, or other agentic coding tools. Claude Code is...

    We don't need coders, we need engineers who build features end-to-end using Claude Code. Without any "hand-coding".

    Details: 
     • AI coding experience (mandatory!): experience with Claude Code - #1 priority, or other agentic coding tools. Claude Code is what is used on the project 
    • Senior Full-Stack Engineer (SvelteKit Frontend, Golang Backend), 5+ years of experience, can potentially consider really strong candidates with 4 years of experience 
    • Strong proficiency in English (Upper-intermediate level or Advanced)
     • Full-time
     • Fully remote
     • Start: ASAP!

    Sharing more details about the responsibilities and requirements below.

    What you'll actually do:
     • Own features end-to-end: from specs to deployment to fixing bugs
     • Use Claude Code to generate SvelteKit frontend and Golang backend code
     • Review AI output for quality and architectural fit
     • Fix bugs to learn our codebase, then rapidly build new features
     • Make quick decisions on what to build vs buy vs generate with AI
     • Talk to customers when they report issues and ship fixes same day

    Our stack:
     • Frontend: SvelteKit, turbo monorepo, Vercel
     • Backend: Golang monorepo
     • AI: Claude Code (mandatory), other agentic coding tools

    Products you will build:
     • API: platform features, tooling, multi-agent system, etc.
     • UIs: internal UIs, B2B dashboards, B2C web appsYou must have:
     • Ownership mentality with a strive for elegantly simple, high-quality solutions
     • Strive for max quality - you test your own work thoroughly since we have no QA team, everything you ship MUST work
     • Product mindset - you care about WHY we're building something
     • Proven experience using Claude Code or similar agentic AI (Cursor, Windsurf) 
     • Strong SvelteKit and Golang experience - you'll review AI's code in these, and you must understand how it works
     • Broad architectural knowledge of building modern full-stack applications
     • Excellent spoken English and a good internet connection for daily video calls

    You are a great fit if you:
     • Get frustrated when development takes weeks instead of days
     • You think in features and architecture and not single lines of code
     • Can spot subtle bugs in AI-generated code quickly
     • You ship fast but always verify it actually works
     • Have shipped real products that customers actually use
     • Think "how can AI build this?" as your first instinct

    Red flags (don't apply if):
     • You've never used Claude Code or similar AI coding tools
     • You're a perfectionist who loves to code
     • You need detailed specs before starting
     • You see AI as a threat rather than leverage
     • You're outside European/African timezones

    More
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