Kozak Agency

We are looking for an experienced Database Architect on an outstaffing basis to address analytics limitations identified during the technical audit, help transform the platform into a secure, scalable, data-driven solution capable of handling increased daily opt-ins, and support its migration to a new cloud provider.

About the project: This project is a Customer Activation Platform (CAP) designed to capture high-intent customer opt-ins in real time and convert them into verified, actionable data. It enables users to engage through simple mobile interactions such as a tap, scan, or click — without requiring traditional forms or app downloads.
The platform focuses on activating customers at the moment of highest intent, capturing verified contact information, and instantly sending it to connected systems like CRM, CDP, or loyalty platforms. It supports seamless integration across digital and offline touchpoints, helping businesses drive real-time engagement and improve marketing performance.

Start Date: in 2 weeks
Employment type: 1 FTE for 2 months, next 2 months 0.5 FTE 
Project Duration: 4 months
Location: Europe, Ukraine (remote)
Language: English B2 (upper-intermediate)

Requirements:

• 5+ years of experience in Data Engineering
• Experience with maintaining SQL Server database schemas
• Strong expertise in Entity Framework 6.x for ORM operations
• Solid experience in database schema design and migration management
• Hands-on experience with connection pooling and database performance tuning
• Strong knowledge of stored procedures and complex query design
• Experience with Cloud SQL for SQL Server and BigQuery architecture/design
• Practical experience building ELT pipelines using Cloud Data Fusion and Dataform
• Knowledge of dimensional modeling

Responsibilities:

• Design a robust database architecture
• Maintain SQL Server database schemas
• Write optimized SQL queries and stored procedures
• Implement database migrations and schema updates
• Monitor and optimize query performance
• Manage data integrity and referential constraints
• Implement backup procedures
• Work with multiple databases

Process Flow:

1. HR pre-screen + English check (0.5 h)
2. Professional interview (1 h)
3. Interview with the Client (1 h)

Job Type: Full-Time (40 hrs/week) | Duration: Long-Term (3+ years) | Experience Level: Intermediate to Expert
English B2+

About Us
We're a Salesforce Summit Partner building enterprise-grade DevSecOps tools used by Fortune 500 companies in regulated industries. Our platform is 100% Salesforce-native, and our customers include names like Hilton, Cargill, and AARP. We're scaling fast and need builders — not bystanders.

What You'll Do
Build and maintain complex, production-grade front-end interfaces using Vue.js (Vue 2 and/or Vue 3) with Composition API
Develop reusable, well-tested component libraries that scale across multiple product lines
Integrate front-end layers with Salesforce Lightning Web Components (LWC) and REST/SOAP APIs
Own the full front-end lifecycle: architecture decisions, code reviews, performance tuning, and deployment
Collaborate directly with product managers, backend developers, and UX designers in a fast-paced, low-bureaucracy environment
Write clean, maintainable, well-documented code with proper unit and integration test coverage
Troubleshoot and resolve cross-browser compatibility issues, performance bottlenecks, and UI/UX inconsistencies

What We Expect

• 3+ years of hands-on, professional Vue.js experience (not tutorials — production apps)
• Deep understanding of Vue Router, Vuex/Pinia, and reactive state management patterns
• Strong proficiency in JavaScript (ES6+) and TypeScript
• Experience with build tools: Vite, Webpack, or Rollup
• Solid grasp of HTML5, CSS3/SCSS, and responsive design principles
• Familiarity with RESTful API consumption and asynchronous data handling
• Experience writing unit tests (Jest, Vitest, or Vue Test Utils)
• Comfortable working in Git-based workflows with CI/CD pipelines
• Bonus: Experience with Salesforce Lightning Design System (SLDS) or Lightning Web Components

About the Role

We are urgently looking for a Senior iOS Developer with strong native iOS expertise and solid experience in React.js and Node.js.

Responsibilities

• Develop and maintain native iOS applications (Swift / SwiftUI / UIKit)
• Participate in architecture design and technical decision-making
• Integrate mobile applications with backend services
• Collaborate with frontend team (React.js)
• Work with Node.js backend (API integration and possible improvements)
• Conduct code reviews and mentor team members
• Participate in sprint planning and task estimation

Project Description:
You will be developing and maintaining Drupal based websites and systems as part of our award winning multi-disciplinary team of developers, designers and product managers. We build systems of all kinds across the local government and social housing
sectors, meaning every project that you work on will provide its own unique challenges. We are looking for an experienced Drupal developer to join the Resident Experience team. You will be creating and maintaining resident portals; this involves creation of bespoke modules, implementation of existing modules, and integration with various third party systems. These portals are used by a large number of people across the UK to help manage their tenancies. You will work daily with members of the project management team, customer success team, as well as other developers. Occasionally, you may be required to join calls with our clients to help with troubleshooting, scoping, and to support non-technical stakeholders with more technical discussions.

We maintain a friendly working environment and provide you with all the tools you’ll need to plan, develop, test and deploy code of the highest quality. This is a remote position based anywhere in the UK and you have the choice of either working from home or from our London office.

Required skills:
!!! location - only GDPR countries !!! (Europe location)
PHP - 5+, Drupal - 3 years, Laravel or Symfony - 1+ year, any exp with JS on front
● At least 2+ years of experience developing with Drupal.
● Strong PHP, SQL, and JavaScript skills.
● Experience creating custom modules
● Experience working with custom templates
● Experience with testing frameworks
● Version control systems experience such as Git
● Competency with the command line, and command line tools.
● Working experience with macOS or Linux systems
● A self-starter who assumes responsibility for their work, accepts direction and feedback from co-workers and managers and is able to own the software developed
● Attention to detail when building resilient software
● Amenable to learning other systems and frameworks and contributing to the wider team’s efforts
● Excellent communication skills in English

Project: Rental Marketplace

Requirements:
3+ years of experience with Golang
English: В2+ (must have)
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 

About Project: AI-Powered Jigsaw Puzzle Game
Approach: Milestone-based development, starting simple and adding complexity in phases.

Experience: Mobile developer with background in entertainment apps or games (more critical than specific tech stack). Should be highly proficient with AI-assisted development tools (Cursor, Claude, etc.) and comfortable having 90%+ of code AI-generated.

Nice to Have: Familiar with game-like animations and UI patterns for puzzle games.
Experience integrating with AI image generation APIs for real-time processing.

Tech: React Native preferred but open to other mobile frameworks.

English level - Upper intermediate
 

We are looking for a hybrid Graph Data Scientist and Web Visualization Engineer to work across two interconnected streams: advanced graph analytics and development of a production-grade web application for interactive data exploration and stakeholder reporting.

This role combines deep graph database expertise, algorithmic thinking, and strong frontend engineering skills to deliver both analytical insights and a robust, user-facing web platform.

Role Overview
The specialist will contribute across two complementary workstreams depending on project phase and priorities.

Workstream A – Graph Analytics & Algorithms (0–50%)
 

• Explore and understand complex graph schemas using database tooling
• Develop efficient graph queries to identify patterns and relationships
• Implement graph algorithms and pattern detection (e.g., link prediction, shortest paths, structural metrics)
• Perform statistical analysis of graph structure
• Collaborate with domain experts to refine hypotheses and analytical approaches

Workstream B – Frontend Web Application (50–100%)
 

• Define and prioritize features for a usable MVP and iterative product evolution
• Architect and implement a modern SPA/SSR web application (React/Next.js, Vue/Nuxt, or similar) using TypeScript
• Build high-performance, interactive graph visualizations with property panels, filtering, search, drill-down, and linked brushing
• Visualize ML model outputs and analytical results
• Deliver dashboards, dynamic reports (PDF/HTML export), and in-app narratives
• Integrate authentication (OAuth2/OIDC) and role-based access control
• Implement logging, telemetry, and issue tracking integration
• Ensure performance optimization for large-scale graphs (WebGL where applicable)
• Maintain CI/CD, automated testing, accessibility, and cross-browser compatibility

Technical Requirements

• Hands-on experience with graph databases and query languages
• Strong understanding of graph theory and applied graph algorithms
• Modern frontend development expertise (JavaScript/TypeScript + framework)
• Experience with web visualization libraries (D3, Plotly, ECharts, Vega-Lite)
• Experience with graph visualization libraries (Cytoscape.js, Sigma.js, etc.)
• API integration (REST/GraphQL) and secure client-side data handling
• Git-based workflows and structured release management

Nice to Have

• Graph ML & embeddings (node2vec, DeepWalk, GraphSAGE)
• PyTorch Geometric / DGL exposure
• Experience with multimodal scientific data (e.g., omics, imaging)
• WebGL optimization for large graph rendering
• Experience with CI/CD, containerization, and cloud deployment

Approximate start: 23.02.2026

Candidate profile: Senior Kotlin developer, 
5+ years of commercial experience; 
background in fintech/payment/banking; 
English B1+; 
EU-based.

Core skills: Kotlin, Spring Boot, REST, JSON, HTTP, microservices, Apache Camel/Kafka, SQL & NoSQL (PostgreSQL, MongoDB), Elasticsearch, Redis, Temporal, CI/CD (GitHub Actions/Jenkins/GitLab CI), AWS/GCP, Docker, Kubernetes, security (OAuth2/JWT/HTTPS), testing (JUnit, Mockito, Testcontainers), event‑driven architecture.

Location: EU

Approximate start: 23.02.2026

Candidate profile: Senior Kotlin developer, 
5+ years of commercial experience; 
background in fintech/payment/banking; 
English B1+; 
EU-based.

Core skills: Kotlin, Spring Boot, REST, JSON, HTTP, microservices, Apache Camel/Kafka, SQL & NoSQL (PostgreSQL, MongoDB), Elasticsearch, Redis, Temporal, CI/CD (GitHub Actions/Jenkins/GitLab CI), AWS/GCP, Docker, Kubernetes, security (OAuth2/JWT/HTTPS), testing (JUnit, Mockito, Testcontainers), event‑driven architecture.

Location: EU
Duration: 3 months

Starting: ASAP
Long engagement
Full-time developers are needed
 

• Development of additional APIs in the Backend for Frontend
• Refactoring and elimination of technical debt
• Need in the area of API testing, using Katalon. Ultimately, the tests should run in the pipelines.
• The main focus remains on the subject of insurance, commission, and business processes.
• We are looking for developers at the medior or senior level; junior developers are not an option for us in this urgent situation.
• Fully remote work
• Good English is a must (German is a plus)

Workload: full-time
Start: asap
Duration: long-term
Location: any

About the project:
Development of an internal Back Office system.

Tech stack:
PHP 8.x, Symfony / Laravel, Vue 3, PostgreSQL, Redis, WebSocket.

Responsibilities:
Design and development of Back Office system architecture
Development of the Back Office frontend
Integration with third-party services

Requirements:
5+ years of commercial experience with PHP
Experience designing applications using Symfony or Laravel
Strong experience with Vue 3, including
Composition APIExperience designing REST APIs, versioning, and documentation
Strong experience with MySQL or PostgreSQL, including query optimization and working with large databases
Experience with Redis, RabbitMQ, Docker, and CI/CD

Nice to have:
Experience building large admin panels

We are looking for a Senior Mobile Engineer to join a fast-growing international product company and support long-term product development.
 

Project Details

• Workload: Full-time
• Start: ASAP
• Duration: Long-term
• English: B2–C1 (fluent written and spoken communication required)

Role Overview

As a Senior Mobile Engineer, you will be responsible for building and scaling native mobile applications for both iOS and Android.

You should feel confident owning features end-to-end on the mobile side, making architectural decisions, and contributing to product discussions.

We are looking for someone proactive, independent, and comfortable working in a fast-moving product environment.

Required Skills & Experience

• Strong commercial experience with iOS development (Swift, SwiftUI)
• Strong commercial experience with Android development (Kotlin)
• Experience building and maintaining production-grade mobile applications
• Solid understanding of mobile architecture patterns
• Experience integrating with REST APIs and backend services
• Ability to operate independently and take ownership of features
• Fluent English (B2–C1)
  
  Nice to Have
• Experience with Jetpack Compose
• CI/CD for mobile apps
• Docker
• Experience working closely with React / Node.js teams
• Experience in startup or product companies
  
   

Senior Backend Engineer (Java) – FinTech / Banking Domain

We are looking for a Senior Backend Engineer to join a FinTech project in the banking domain. This is a long-term project running until the end of the year, with a planned start within 2–3 weeks.
 

🔎 About the Role

We are not looking for a “ticket-closing” developer. We need a proactive professional with strong ownership and personal attitude toward the product — someone who:

• Supports analysis and contributes to architectural discussions
• Proactively proposes improvements and new solutions
• Builds synergies between different functional and technical areas
• Takes responsibility beyond just implementation
   

The main focus is Backend development, but experience with JavaScript/TypeScript is a strong plus.

🛠 Tech Stack

• Java (11/17/21)
• Spring Boot
• SQL
• AWS (including S3 concepts – key knowledge)
• Jenkins / Git
• RabbitMQ
• Python (nice to have)
• JavaScript
• TypeScript (nice to have)
  
  Requirements
• 5+ years of commercial experience
• Strong expertise in Java & Spring Boot
• Experience working with AWS
• Solid understanding of backend architecture and system design
• Upper-Intermediate+ English (strong communication skills required)
• Experience in FinTech / Banking domain is a plus
  
  Project Details
• Domain: FinTech / Banking
• Duration: Until the end of the year
• Start: Within 2–3 weeks
• If you are a senior-level engineer who thinks beyond tasks, brings ideas, and takes ownership — we’d love to connect.

Workload: full-time
Start: asap
Duration: long-term
English: B2-C1

We would like to engage 1–2 senior engineers to support our product development.
All candidates must be fluent in English (written and spoken) and comfortable operating in an international, high-velocity startup environment.

Engagement options:

Option 1 – One Senior Full-Stack Engineer
We are looking for a highly experienced engineer capable of contributing across:
Mobile (iOS + Android)
Web
Backend
This person should be confident working end-to-end and comfortable owning features across the full stack.

Option 2 – Two Senior Engineers
One Senior Mobile Engineer (iOS and Android)
One Senior Full-Stack Engineer (Web + Backend or Mobile + Backend)

Required Experience:
Strong professional experience with iOS (SwiftUI)
Solid experience with React
Strong backend experience with Node.js
TypeScript
Postgres or MySQL

Nice to Have
CI/CD
Docker
Tailwind
Shadcn
Android (Jetpack Compose)