Kozak Agency

Required tech stack:
-TypeScript
-Node.js
-React & React Native
-Experience with microservices and event-driven architecture
-Cloud platforms (GCP or AWS)

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 seeking an exceptional Data Architect to lead data storage strategy and design across our multi-product SaaS platform as we unify independent products into a coherent platform. This role combines strategic leadership with hands-on technical expertise—you'll shape our data architecture vision while getting into the details during implementation and troubleshooting.

Key Responsibilities: 
• Drive data architecture unification across multiple SaaS products, creating coherent patterns while respecting product needs.
• Partner with vertical technical leads to provide horizontal architectural support and alignment.
• Design and optimize data storage across multiple technologies—AWS OpenSearch/Elasticsearch, relational databases, S3, NoSQL, and data warehousing.
• Optimize for performance and resilience— indexing, querying, high availability, redundancy, and disaster recovery at scale.
• Support AI initiatives—partner with our AI specialist team on data architecture for AI capabilities.
• Bring clarity from ambiguity—translate complex challenges into clear architectural direction.
• Build capability, not dependencies—mentor engineers so teams become more self-sufficient.
• Balance performance, cost, and reliability across our platform.

Qualifications:
• Deep expertise in AWS OpenSearch/Elasticsearch—you've solved hard problems at scale with indexing, querying, and performance.
• Broad data technology experience—relational databases (e.g. PostgreSQL, MySQL, RDS), object storage (S3), NoSQL (e.g. DynamoDB, MongoDB, Redis), data warehousing.
• Cloud and container knowledge—AWS preferred (Azure/GCP also valued); understand stateful services in Kubernetes.
• Proven platform architecture experience—track record of driving technical strategy across multiple teams or products at scale.
• Senior-level maturity—you make those around you better through mentorship and capability building.
• Influence without authority—you work effectively across teams, bring clarity from ambiguity, and think strategically.
• SaaS experience—comfortable with multi-tenant environments and operational excellence.

Requirements:
5+ years of overall commercial software development experience
Java: 4+ years of experience
C++: 2+ years of experience
Scala: 2+ years of experience
В2+ English

Responsibilities:
Own SQL acceleration features end-to-end — from design to implementation and measurable performance impact
Implement and optimize Big Data processing algorithms across Scala, Java, and C++
Develop performance-critical components at the intersection of Big Data and compilers
Work with custom DSL and code generation systems to extend query execution capabilities
Contribute to cross-language integrations (Java  C++ via JNI) and overall system performance improvements

Шукаємо Kotlin розробника -  на розробку бекенд частини проекту (SaaS), яка по API віддає все-необхідне на frontend (Web), має займатись обробкою та зберіганням даних.

Бажані навики: Kotlin + Spring Boot + PostgreSQL + jOOQ

• Project: Long-term
 • Tech stack: Kotlin
 • English: Not required

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 

Workload: full-time
Location: preferably EU (but if the candidate has a good match other countries can be considered as well)
Start: within a couple of weeks
Duration: 6 months with a potential prolongation
English: B2

Job description:
Senior WiFi engineer with deep experience in WiFi chipset bring‑up, embedded driver development, and the Android/Linux WiFi stack within modern automotive and virtualized environments. Strong track record enabling high‑performance wireless connectivity in complex IVI and software‑defined vehicle platforms.
The end client is located in the US, California.

Key Strengths

• WiFi driver bring‑up, integration & performance tuning
• Android/Linux WiFi stack (HAL, wpa_supplicant, hostapd)
• Hypervisor & virtualized Android environments
• System‑level debugging across HW, kernel & user space
• Experience with WFA certification workflows
• Android Auto / Apple CarPlay wireless connectivity
• Collaboration with chipset vendors & cross‑functional teams

Location: Remote (EU / Ukraine)
Start Date: ASAP
Duration: long term
Interview Process: 2 rounds + assessment
Languages: English (min. B2), German is a plus

Your Role

• As a Senior Development of our ticketing platform (Next.js + Payload CMS)
• Building and maintaining microservices (primarily in Go)
• Enhancing our in-house analytics software
• Managing and processing growing datasets (MongoDB)
• Contributing to system architecture and technical decisions
• Developing new services and features in a fast-paced environment

What We’re Looking For

• Several years of experience in web development
• Strong skills in JavaScript frameworks (ideally Next.js)
• Experience with cloud infrastructure and modern architectures
• Solid understanding of backend development (Go experience)
• Experience with server architecture and database structures
• Experience working with databases such as MongoDB
• Familiarity with AI-supported processes and workflows
• Ability to work independently and take ownership
• A forward-thinking and responsible approach to development

In this role, you will be a key contributor to the development and evolution of the Satori AI Platform, building next-generation conversational and agentic AI solutions for enterprise procurement and supplier ecosystems.

You will design, develop, and deploy intelligent chatbot solutions using Microsoft technologies, enabling seamless interactions across omnichannel platforms such as Microsoft Teams, web, and enterprise applications. The role involves leveraging NLP, machine learning, and agentic AI frameworks to create context-aware, scalable, and business-driven conversational experiences.

You will also collaborate closely with product, architecture, and integration teams to enhance platform capabilities, optimize existing solutions, and ensure high performance, security, and user experience.

Key Responsibilities
• Design and develop intelligent chatbots for the Satori AI Platform using Microsoft Bot Framework SDK and Azure Bot Services
• Build and manage conversational agents in Copilot Studio / Power Virtual Agents (Agents in Portal)
• Implement Omnichannel solutions across Microsoft Teams, web, and other enterprise channels
• Integrate chatbot solutions with enterprise systems such as SAP S/4HANA, SAP Ariba, ServiceNow, and other APIs
• Design and implement conversational flows using adaptive dialogs and orchestration frameworks
• Develop agentic AI workflows for enterprise use cases such as procurement automation, supplier queries, and compliance tracking
AI Capabilities
Natural Language Understanding (NLU)
Context and memory management
Multi-turn and goal-driven conversations
Retrieval-Augmented Generation (RAG)
• Work with modern Agentic AI frameworks (e.g., Semantic Kernel, LangChain, AutoGen)
• Collaborate with cross-functional teams including architects, UX designers, and backend developers
• Ensure chatbot solutions are scalable, secure, and enterprise-grade
• Monitor, debug, and continuously optimize chatbot performance using telemetry and analytics tools

Qualifications
• Strong experience in chatbot development using Microsoft Bot Framework SDK and Azure Bot Services
• Hands-on experience with Copilot Studio / Power Virtual Agents (Agents in Portal)
• Good understanding of Omnichannel solutions and integrations

Technical Skills
• Strong programming skills in C#, Python, or JavaScript (Node.js)
• Solid understanding of Natural Language Processing (NLP) and tools such as LUIS or equivalent services
• Experience with machine learning concepts and conversational AI design
• Exposure to Agentic AI frameworks and modern AI architectures (preferred)


Additional Skills
• Experience integrating with enterprise platforms (SAP, - ServiceNow, REST APIs, databases)
• Knowledge of cloud platforms (Azure required; AWS exposure is a plus)
• Strong problem-solving and analytical thinking
• Ability to work in a collaborative, fast-paced environment

Education
• Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field

Scope of work essentially includes the development and enhancement of modern web applications within the JavaScript/TypeScript ecosystem as well as the implementation of scalable backend services on AWS. In particular:
 

• Backend development on AWS including serverless architectures (Lambda, DynamoDB, SQS, S3, CloudWatch, Cognito).
• Infrastructure-as-Code using CloudFormation or Serverless Framework.
• Stack: Angular on frontend and AWS backend or comparable JS/TS stacks.
• Implementation and maintenance of REST APIs (OpenAPI).
• Ensuring software quality: Clean Code, reviews, unit and E2E tests.
• Use of CI/CD pipelines (Azure DevOps) and Git.

• Collaboration in agile teams as well as support in operations, monitoring, and troubleshooting.

   

Backend Developer AWS (IaC, Serverless)

• Excellent knowledge of the JavaScript/TypeScript ecosystem.
• Several years of experience with AWS cloud technologies.
• Expert knowledge in serverless architectures (Lambda, DynamoDB, SQS, Cognito, etc.).
• Infrastructure-as-Code with CloudFormation or Serverless Framework.
• Development of scalable REST APIs.

• Experience with Git, code reviews, and CI/CD.

   

Otherwise, nothing specific

• Confident use of Git and pull requests.
• Experience with CI/CD pipelines (Azure DevOps preferred).
• Experience in test automation (unit, integration, E2E).
• Good communication skills as well as a structured, independent way of working.
• Experience in agile development teams.
• Desirable: Knowledge of the energy sector

Availability: Must be able to start immediately or within days of contract signing, given the May 4th deadline.

Work style: Remote work; comfortable with video meetings, asynchronous communication, and working with a small, non-technical client team.
Location/Time zone: Must be based within a maximum 3-hour time difference from CET (Europe preferred) to enable smooth collaboration.
English: B2 +

General info
We have a client who is looking for a full-stack developer. The need is to build a new booking system, with a focus on improving UX, tracking, and data handling.
The timeline is quite tight, with a project deadline set for May 4th, so we’re looking for someone who can start fairly soon.

Skills (punctual tech stack) 
● Microsoft technologies
● API integration
● JavaScript
● HTML & CSS
● BankID integration
● Certificate management
● Server/hosting
● GDPR-compliant Assignment

● .Net/C# 
● Azure 

Description
Our Customer is transitioning to a new booking and journal system (Clinic Buddy) and needs to build a custom booking flow on their website. The current solution is a simple widget with limited UX control and no tracking capabilities.

You will be responsible for: 
● Implementing a custom booking frontend based on existing UX designs and HTML/CSS prototypes provided by the customer.
● Integrating BankID authentication using an existing certificate.
● Ensuring full GDPR compliance and advising on EU-based hosting solutions for the backend layer.
● Enabling proper tracking and analytics integration for marketing purposes. The project has a hard deadline of May 4th, 2026.

About the team 
You will be working closely with Our Customer's webmaster/UX designer, who handles all web-related tasks, including UX/UI, SEO, and light front-end coding. She sits within the marketing team alongside the Head of Marketing and two content specialists focused on social media and video production. The webmaster has strong HTML/CSS skills and has already created a clickable prototype of the desired booking flow. However, backend development capacity is limited in-house, which is why external expertise is needed.

Must haves !!!
● Strong full-stack development experience in production environments
● Expertise in API integration and building secure proxy/backend layers
● Proven experience with GDPR-compliant architectures and handling sensitive personal data
● Experience with BankID or similar certificate-based authentication systems (Swedish BankID highly preferred)
● Strong frontend skills: ability to implement pixel-perfect UIs from designs/prototypes, including multi-step forms and booking flows
● Security-conscious mindset: understanding of certificates, secure data handling, and separation of concerns
● Excellent communication skills in English; able to explain technical concepts clearly to non-technical stakeholders
● Self-driven and reliable: able to work independently, meet hard deadlines, and proactively raise risks

About the Customer 
Our Customer is a leading specialized provider in the Nordics, operating multiple clinics across three major cities. The company has a strong and growing market presence, leveraging social media and modern digital marketing strategies. They recently relaunched their main website on Webflow after a significant redesign project. Our customer's value clear communication, reliability, practical GDPR awareness, and partners who can deliver high-quality work within tight deadlines.

Location: EU, Ukraine
Start: ASAP
Interview Rounds: 2+Assessment (+ можливо тестове завдання)

We’re looking for four experienced Full-Stack Developers to join us on an initial six-month project to build and ship high-quality digital products. Strong frontend expertise is especially important, and at least one developer should bring solid Swift or Kotlin experience to support mobile-related work.

What You’ll Bring
React & TypeScript
• Around 5+ years building robust, scalable web applications with React
• Strong component architecture, performance optimization, and modern frontend patterns
Node.js & Backend Knowledge
• Around 5+ years working with Node.js
• Comfortable designing and evolving APIs (GraphQL or REST)
• Experience modeling data in relational databases such as PostgreSQL or SQLite
State Management
• Pragmatic experience with tools such as Zustand, Redux, or similar solutions
Mobile Development (for at least one role)
• Strong Swift or Kotlin experience for mobile-related development

Nice to Have
• Experience building offline-first applications (service workers, caching strategies, sensible fallbacks)
• Familiarity with local-first data architectures, sync patterns, or real-time UI updates
• GraphQL experience
• Exposure to cloud infrastructure and containers (AWS, Docker, CI/CD)
• Solid UI foundations such as design systems, design tokens, or Storybook
• Accessibility and UX best practices
• An aesthetic eye for UI design (colors, shapes, spacing)

Workload: full-time/part-time
Location: Israel, Tel Aviv!
Start: in a couple of weeks
English: B2

Company Description
Our company develops advanced AI solutions for life science, pharmaceutical, and biotech organizations. The company helps clients design practical, high-impact AI systems that improve research, development, knowledge management, and business processes. A key focus is building AI Knowledge Libraries that enable companies to structure, connect, and use their organizational knowledge more effectively with AI:

Role Description
This is a remote contract role for an AI Architect. The AI Architect will be responsible for designing and implementing enterprise AI solutions to specific use-cases, with a strong focus on designing AI Knowledge Libraries for companies in the life science, pharmaceutical, and biotech sectors.

Qualifications
Expertise in Architecture and Architectural Design for scalable and efficient AI systemsStrong experience with Microsoft AzureStrong experience with Microsoft 365 Copilot / Copilot StudioExperience designing and implementing enterprise AI solutionsGreat person to discuss on AI strategy, innovation and practical business opportunities

Start: as soon as possible
Duration: long-term
Workload: full-time
Location: any, EU 
English: B2

About the client:
Our client is a provider of Software as a Medical Device (SaMD) specializing in AI-driven lung cancer detection, diagnostics, and therapy for the US and European markets.
To support their rapid growth, we are currently seeking staff augmentation to accelerate their existing product roadmap.

Their Technology Stack & Environment:
Core Languages: Scala, Python, TypeScript
Cloud Infrastructure: Microsoft Azure
Domain Specializations: AI/ML, DICOM, and HL7 integration

Candidates with a strong med-tech background are preferred.
(Note: HL7 integration --> this is highly specific to med-tech)

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
Cloudflare – R2, CDN, Workers
 

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

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 

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