Jobs at Djinni

Inforce is a Software Development Company that provides a full range of top-quality IT services. Our mission is to develop first-class applications and Websites to provide our clients with the best solutions for maximizing their profits and converting their ideas into reality.

Why This Role Excites You

• Build & Grow: Develop scalable .NET solutions and strengthen your technical expertise.
• Client Interaction: Participate in client calls and contribute to requirements and technical discussions.
   

Key Responsibilities

• Analyze requirements and participate in software design.
• Develop, test, debug, and improve .NET applications.
• Build and integrate REST APIs.
• Collaborate with internal teams and communicate with clients.
• Provide technical support and maintain documentation.
   

What We're Looking For

• 6–15 months of commercial .NET experience is a must.
• Strong knowledge of C#, ASP.NET, SQL Server, REST APIs.
• Understanding of MVC and design/architectural patterns.
• Basic knowledge of HTML5/CSS3, JavaScript and Angular/React.
• Understanding of Agile methodologies and clean code principles.
• Good troubleshooting and communication skills.
• English: Intermediate–Upper-Intermediate.

Why Join Us

• Interesting and challenging projects.
• Career growth opportunities.
• Friendly professional team.
• Paid sick leave and vacation.
• Company covers 50% of professional course costs after the trial period.

N-iX is looking for a highly skilled Senior System Analyst to join the project aimed at modernizing and developing the client solutions. 

Our client is one of the largest banks in Ukraine, with its headquarters in the EU. They specialize in bank services for businesses and individuals in Ukraine and Europe.

Responsibilities:

• Gather, analyze, and document business requirements for different software systems 
• Write technical documentation (functional and non-functional requirements) and determine development priorities 
• Define, elaborate, and document architectural solutions, design data storage structures, and determine integration points with external/internal systems 
• Perform post-deployment control of new IT system versions 
• Develop specifications, user stories, and business process documentation
• Identify incidents in information systems 
• Train, consult, and support employees involved in preparing development requirements 

• Support project delivery by monitoring progress and assisting in issue resolution

   

Requirements:

• Proven experience as a System/Business Analyst or similar role
• Experience in formalizing software requirements and setting tasks for developers 
• Proficiency with relational (SQL queries, DB structures, transactions, indexes) and non-relational databases 
• Knowledge of non-functional requirement types 
• Knowledge of web technologies, understanding of the strengths and weaknesses of integration protocols (HTTP, SOAP, REST). Experience with SOAP/REST web services and JSON/XML formats 
• Experience with tools such as Jira, GIt, Confluence, or similar
• Proficiency in BPMN and UML modeling languages (Deployment-, Component-, Use Case-, Sequence diagrams) 
• Knowledge of application authentication and authorization methods 
• Understanding of software component interaction patterns 
• Analytical mindset with problem-solving abilities

• Bachelor’s degree in Business, IT, or related field

   

Nice to Have:

• Practical experience in banking or financial services for enterprise clients

• Experience in banking, financials or insurance domain

   

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

Head of Marketing — US Market

Company: Crystalia Glass
Contract: B2B
Format: Remote
Market: US
Working hours: 8:30 AM–5:00 PM New York time, with at least 6 hours of daily overlap
Media budget: $200K+/month

Crystalia Glass is a US manufacturer and installer of premium architectural glass systems for residential and commercial interiors, including glass partitions, sliding glass walls, and steel- and aluminum-framed systems.

We are looking for a Head of Marketing to own and develop our US marketing function across brand, growth, performance, analytics, and team leadership.

Core Requirements

• 7+ years of marketing experience, including 3+ years leading a full marketing function with ownership of strategy, budget, team, and results.
• Direct experience owning marketing for the US market, with responsibility for customer acquisition, demand generation, and brand growth.
• Experience marketing the same product or brand to both B2B and B2C audiences simultaneously — with distinct positioning, customer journeys, acquisition strategies, and funnels for each audience.
• Experience in a relevant or closely related industry — ideally construction, building materials, architecture and interior products, custom furniture, home improvement, premium home products, or another comparable high-consideration category.
• Experience managing significant paid media budgets — ideally $1.5M+ annually — with the ability to discuss actual spend, channel allocation, and resulting business performance.
• Strong full-funnel analytics experience, including attribution, CAC, ROMI, conversion rates, channel economics, and analysis through to closed revenue.
• Strong experience with CRM systems, including pipeline structure, workflows, lead qualification, reporting, and funnel analysis. We currently use HubSpot, but experience with other advanced CRM platforms is absolutely fine.
• Experience leading distributed marketing teams of 8+ people, including specialists, contractors, and agencies.
• Proven marketing and growth results supported by specific numbers and business outcomes.
• English C1+, with strong written English for US-facing communication, messaging, and creative review.

What You'll Own

Brand & Market Position

• Define and strengthen Crystalia's positioning in the US premium market
• Build consistent messaging and brand standards across channels and customer touchpoints
• Develop a visual production pipeline for completed projects — photography, video, and portfolio content
• Build PR and media presence in architecture, interior design, construction, and relevant lifestyle publications
• Develop partnerships with architects, interior designers, contractors, and other trade professionals

Growth & Performance

• Own marketing-sourced growth across both B2B and B2C
• Manage and allocate a $200K+ monthly media budget
• Lead strategy across paid search, paid social, SEO, content, CRM, and other acquisition channels
• Make channel and budget decisions based on closed revenue and unit economics, not lead volume alone
• Improve qualified demand, conversion, CAC, ROMI, and overall marketing efficiency

Analytics & Funnel

• Build visibility from first touch through closed revenue
• Develop attribution and channel-level unit economics
• Track and use CAC, ROMI, conversion rates, close rates, average deal value, and sales-cycle length
• Analyze lost opportunities, objections, CRM data, and customer conversations to improve positioning and campaigns
• Build concise executive reporting focused on metrics that drive decisions

Sales Partnership

You will work with Sales leadership as a peer partner, not as the manager of the Sales organization.

Together, Marketing and Sales will:

• Define and review lead qualification criteria
• Analyze lead quality, conversion, and revenue by source
• Review funnel performance and lost-deal reasons
• Improve the handoff and customer journey between Marketing and Sales

Marketing owns funnel analysis through closed revenue; Sales leadership owns sales targets, processes, and people.

Team & Operations

You will lead a distributed marketing team across B2B and B2C marketing, SEO, PPC, Paid Social, SMM, Community, Design, and CRM.

You will:

• Assess and develop the existing team structure
• Strengthen brand and analytics capabilities
• Hire and manage specialists, contractors, and agencies
• Establish clear ownership, processes, quality standards, and accountability
• Build systems that can scale with the business

Digital & E-commerce

Our new website is currently in development and will introduce e-commerce elements, including customer accounts and online purchasing for selected products.

E-commerce is not our primary business model, but experience with digital customer journeys, online conversion, and e-commerce mechanics will be valuable.

Strong Advantages

• Premium or luxury product experience
• Architecture, construction, building materials, interiors, custom furniture, or home improvement background
• Experience with architect, designer, contractor, or other specifier channels
• Experience building a brand function from the ground up
• PR and media relations in architecture, design, construction, or lifestyle
• Showroom, trade show, or physical retail marketing
• New product launches in established markets
• Practical use of AI in marketing workflows for analysis, research, content production, and automation

What Success Looks Like

Build Crystalia into a stronger and more recognizable premium brand in the US architectural glass market, while creating a marketing system that produces predictable and profitable revenue growth.

Success means stronger qualified demand across B2B and B2C, clear attribution from first touch to revenue, smarter budget allocation, strong alignment with Sales, and a marketing organization that can scale with the business.

Inforce is a Software Development Company that provides a full range of top-quality IT services. Our mission is to develop first-class applications and Websites to provide our clients with the best solutions for maximizing their profits and converting their ideas into reality.

Requirements:

• Knowledge of Golang.
• Understanding of REST APIs and databases.
• Willingness to learn and grow as a developer.
• Good English reading and writing skills (B1 level).
• Ability to work remotely and manage your time.

Responsibilities:

• Learn and write clean, simple Go code.
• Help develop and test backend services.
• Work with databases and APIs.
• Fix bugs and support existing projects.
• Take part in code reviews and daily team meetings.
  
   

We offer:

• Competitive salary
• Interesting and challenging projects
• Future career growth opportunities
• Paid sick leave and working day vacation
• A friendly team of professionals
• The company covers 50% of the cost of courses you need
• Exciting team-building activities and corporate parties

Our Client is a leading VC-backed defense technology company founded to bridge the decades-old gap between modern technology and critical national security requirements.

Today, we are building the necessary infrastructure to bring together sensors, autonomy, and operators with our technologies deployed in active operations around the world.

About this position

We are seeking a Senior Software Engineer to join our Legion Platform team. You will design, build, and deploy high-performance, scalable server systems and integration tools that connect hardware and software systems across environments and levels of command. As part of the Legion team, your expertise will be critical to solving complex system challenges and developing a robust platform that is deployed for real-world military missions. This role requires continuous innovation and is a good fit for an engineer who thrives under pressure and demands that their work have an immediate, tangible impact on national security.

Responsibilities

• Design, develop, and implement high-performance, scalable backend systems that form the foundation of the Legion platform.
• Create and maintain integration tools that ensure reliable connectivity between hardware and software systems at all levels of management and in different environments.
• Apply expertise in the development of distributed systems, data pipelines, and real-time information processing solutions.
• Solve complex system architecture problems to continuously improve and increase the reliability of the platform used for military missions.
• Actively work with relational databases (in particular, PostgreSQL), object storage (e.g., S3, MinIO), and geospatial tools.
• Ensure high engineering standards when developing HTTP APIs (REST, gRPC, or GraphQL) and implement reliable authentication and authorization models.
• Work closely with end customers to gather requirements, develop, and deliver software that has immediate and tangible impact.

Requirements

• 5+ years of hands-on backend engineering experience in fast-paced, production environments using either Go, Python, Rust, C/C++, TypeScript, or similar languages.
• Strong background in APIs, distributed systems, data pipelines, or real-time processing.
• Deep experience with relational databases (e.g., PostgreSQL), object stores (e.g., S3, MinIO), and geospatial tools.
• Strong grasp of HTTP APIs (REST, gRPC or GraphQL) and authentication/authorization models.

Will be a plus

• Experience working with Ukrainian Ministry of Defence, and/or NATO members.
• Exposure to Ukrainian military C2 platforms, including Delta, Kretchet, Oreanda, etc.
• Experience supporting Golang-based applications in production.
• Experience building plugins or integrations for common military command-and-control (C2) platforms (e.g. TAK, Maven, Lattice).

Company offer

• Meaningful stock options
• Full health, dental, and vision coverage
• Relocation assistance
• Unlimited PTO (two-week minimum) and all paid Ukrainian public holidays
• Paid parental leave for both parents

Location Kyiv

We are looking for a Senior PHP Full Stack Engineer with React to join our team!

Our client is transforming how leading companies search, analyze, and use patent data through an all-in-one, AI-powered SaaS platform that supports drafting, prior art analysis, collaboration, and project management. The role sits within a multidisciplinary team of IP software specialists, patent data professionals, and patent attorneys, focused on deep-cleaning and organizing global patent data to deliver accurate insights and trend visualizations. The Engineer will be responsible for developing, maintaining, and evolving key areas of the website and related user-facing products. 

Responsibilities:

• Design, build, and maintain the front-end interface for product delivery areas of the client application site, as agreed from time to time with product stakeholders, product designers, and the Technical Program Manager.
• Initially focusing on resolving known and documented bugs across existing products before contributing to ongoing enhancements and new feature development.
• Implement responsive layouts and ensure cross-browser/device compatibility
• Deliver clean, intuitive UI/UX by working against a ticket-based backlog with direction and, as projects evolve, collaborating more directly with product stakeholders.
• Work with external developers and designers to ensure consistent branding, performance, and technical quality
• Ensure accessibility best practices (WCAG) across relevant areas of the site
• Optimize site performance through modern tooling, bundling, and code quality improvements
• Build and maintain additional sections of the client website as needed
• Develop and manage analytics and testing frameworks, including Google Analytics, event tracking, and A/B testing capability
• Provide basic database or API integration support, working alongside the back-end engineering team where appropriate
• Assist in documentation of front-end components, design patterns, and development processes
• Contribute to continuous improvement of development workflows, version control practices, and release processes
• Write and maintain automated tests including unit, integration, and end-to-end (E2E) tests to ensure application quality and reliability.

Requirements:

• 5+ years of experience working in standalone roles responsible for the development and maintenance of web interfaces
• Strong knowledge of the following technical areas: PHP, JavaScript, React
• Experience with D3, Azure, XML & JSON data formats
• Ability to produce scalable, maintainable solutions
• Strong time-management skills with the ability to handle multiple projects concurrently
• A proactive, positive approach to delivering high-quality work
• English level - at least Upper-Intermediate

Nice to have:

• .NET Framework 4.6 is a big plus
• MySQL or SQL Server experience
• Experience setting up A/B testing or similar experimentation frameworks
• Exposure to modern AI-powered development tools and workflows (e.g., code assistants, automated testing, or AI-driven UI optimization)

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

Our Client is an engineering-focused startup that combines data analytics with software development. It operates in three main areas: investigative analytics, crypto market research, and cybersecurity. It specializes in developing custom software solutions that handle large-scale data analytics and investigative workflows. Join the team and help build the foundation for a safer digital future

Responsibilities

• Active Technical Leadership (60% Tech / 40% Lead): You will lead by example. You are expected to write high-quality, production-ready Python code while conducting rigorous, constructive code reviews to maintain elite standards.
• System Architecture: You will view every project through an architectural lens, ensuring that our systems are not just functional, but secure, scalable, and resilient.
• Product Ownership & Stakeholder Management: You will wear the PO hat when necessary—translating high-level business requirements into actionable technical tasks, managing the backlog, and ensuring the “why” behind the code is clear to everyone.
• Agile Orchestration: We move fast. You will manage multiple projects simultaneously using Agile methodologies, ensuring the team stays focused, unblocked, and on track across different delivery cycles.
• Cybersecurity Stewardship: Leverage your domain expertise to bake security into the Software Development Life Cycle. You will guide the team in building tools that handle sensitive data, perform complex analysis, and resist exploitation.

Requirements

• 7+ years of experience in back-end or full-stack development with at least 1+ years in a Lead or 2+ Senior role
• One who can translate technical goals into high-quality, scalable, and robust infrastructure.
• Cybersecurity domain knowledge
• Crystal Clear Communication: You are the antidote to “fluff.” You communicate technical complexities in a direct, actionable way to both engineers and non-technical stakeholders.
• Multitasking Prowess: You thrive in a “Startup-Plus” environment. You can switch contexts between three different projects without losing sight of the quality or the deadline.
• Upper-Intermediate English communication skills, both written and verbal (daily communication with clients and team)

Will be a plus

• Familiarity with Crypto/Blockchain
• Experience coordinating with offshore development teams.
• Exposure to large-scale data processing or Big Data technologies.
• Previous experience working with AI-assisted development tools;

Company offer

• Health Insurance
• Professional English Lessons
• Energy Resilience Budget

Location

Kyiv (partially remote)

Dataforest is seeking a QA Engineer to join our team. If you’re a strong Manual QA who actively uses AI to generate test data and write basic checks faster — you’ve found the right place. We’d love to see your CV!

    What you'll do:

• Conduct manual testing of web applications, assessing both frontend UI/UX and backend API behavior.
• Perform functional, regression, integration, and exploratory testing throughout the entire SDLC.
• Perform API testing using Postman or similar tools.
• Perform database validation using SQL queries to verify data integrity, transformations, and backend logic.
• Using AI create and maintain test documentation (test cases, checklists, bug reports).
• Leverage AI assistants (e.g. Claude) to create automated API and E2E scripts to optimize manual QA workflows.
• Collaborate closely with developers and project managers to maintain high quality standards across the SDLC.
   

     You'll be a great fit if you have:

• 2+ years of hands-on QA experience with web applications built on modern JS frameworks (React, Vue, Angular, pure JS) and REST APIs.
• Active use of AI in your workflow: practical experience applying AI tools for automation, test case generation, or troubleshooting.
• API testing experience using Postman (collections, environments, basic scripts).
• SQL skills for database querying and data validation.
• Solid understanding of the Software Development Life Cycle (SDLC) and QA methodologies.
• Hands-on experience writing clean, comprehensive test documentation.
• Proficiency with teamwork tools: JIRA, Confluence, Git/Bitbucket.
• Strong communication skills and a positive, team-oriented mindset.
• English level: Intermediate (B1) or higher (strong written and spoken communication for daily team collaboration).
   

     Would be a plus:

• Experience testing Stripe, PayPal, or other third-party payment integrations.
• Basic understanding of CI/CD pipelines and how QA fits into automated delivery workflows.
• Experience testing data engineering projects: ETL pipelines, data warehouses, or data integration workflows.
• Experience with web scraping projects — understanding of scraping logic, data extraction validation, and edge case handling.
• Experience with AI/ML product testing — familiarity with testing LLM-based features, recommendation systems, or other non-deterministic outputs.
  
  We ensure your growth with:
• Competitive salary fixed in USD
• Flexible working schedule and fully remote work format
• Paid vacation days and sick leave days 
• Personal and professional development opportunities
• Participation in building innovative projects from scratch using modern technologies
• Team-building activities and corporate events
• English classes and educational events.

Join the Dataforest Team!

We are actively expanding our team and looking for strong new talent to join our ranks. If you are a Data Engineer seeking a friendly team, a healthy working environment, and a flexible schedule — you have found the right place to send your CV!

You'll be a great fit if you have:

- 2+ years of experience with Python;
- 2+ years of experience as a Data Engineer;
- Experience with Pandas;
- Experience with SQL DB / NoSQL (Redis, Mongo, Elasticsearch) / BigQuery;
- Familiarity with Amazon Web Services;
- Experience with Kafka;
- Knowledge of data algorithms and data structures is a MUST;
- Working with high volume tables 10m+.

What you'll do:

- Create ETL pipelines and data management solutions (API, Integration logic);
- Different data processing algorithms;
- Involvement in creation of forecasting, recommendation, and classification models.

Would be a plus:

- Experience with Spark (pyspark);
- Experience with Airflow;
- Experience in statistics;
- Knowledge of DS and Machine learning algorithms.

We ensure your growth with:

- Great networking opportunities with international clients, challenging tasks;
- Building interesting projects from scratch using new technologies;
- Personal and professional development opportunities;
- Competitive salary fixed in USD;
- Paid vacation and sick leaves;
- Flexible work schedule;
- Friendly working environment with minimal hierarchy;
- Team building activities, corporate events.

Job Description

Required Hard Skills (The "Must-Haves")

· Expert C/C++: 3+ years of experience in strictly kernel-mode software development.

· WinDbg Mastery: Ability to perform "post-mortem" debugging without symbols for third-party conflicts, and live kernel debugging using VMWare/Hyper-V/KDNET. You must be comfortable analyzing stack traces, register states, and trap frames.

· Windows Internal Knowledge: Deep understanding of:

• IRQLs (Interrupt Request Levels) and DPC/Dispatcher mechanics.
• Memory Management (Paged vs. Non-Paged pool, MDLs).
• Synchronization primitives (Spinlocks, Mutexes, Pushlocks).

· File System Filters: Proven experience with the Filter Manager Model (FltMgr) and Minifilter drivers (FltRegisterFilter, Pre/Post operation callbacks).

· EDR/Security Driver Experience: Familiarity with:

• ObCallbacks (ObRegisterCallbacks).
• Process/Thread/Image Load Notify routines (PsSetCreateProcessNotifyRoutineEx, etc.).
• Avoiding deadlocks when injecting logic into high-frequency system paths.

Preferred Skills (The "Nice-to-Haves")

· Reverse Engineering: Proficiency with IDA Pro or Ghidra to analyze potential conflicts with third-party drivers (e.g., Antivirus conflicts causing the crash).

· x64 Assembly: Ability to read disassembly to pinpoint the exact instruction causing the fault when source lines are ambiguous.

· WHQL/WHCP: Experience with the Windows Hardware Compatibility Program signing process (in case the fix requires re-certification) and Microsoft Virus Initiative program

Job Responsibilities

Write kernel and Driver software that can reach the internals of the operating system.

· Implement novel collection and protection techniques.

· Write robust driver infrastructure.

· Optimize for extreme performance constraints.

· Research uncharted territories of the Windows kernel, drivers, APIs, and internal mechanisms.

· Crash Dump Analysis: Perform deep-dive analysis of kernel memory dumps (Minidumps and Complete Memory Dumps) to identify the root cause of the crash (e.g., race conditions, stack overflows, invalid memory access, IRQL violations).

· Reproduction & Isolation: Design stress tests and verification procedures to reliably reproduce the BSOD in a controlled environment using tools like Driver Verifier and specific load-testing scripts.

· Code Review & Remediation: Audit the existing C/C++ driver code (specifically Minifilter callbacks and process notification routines) for thread safety, proper lock usage (Spinlocks/ERESOURCE), and memory handling.

· Patch Implementation: Implement robust fixes for the identified issues, ensuring zero regression in driver performance or security efficacy.

· Validation: Verify fixes using Microsoft Driver Verifier and HLK (Hardware Lab Kit) basics to ensure stability under high stress.

Department/Project Description

Our clients is an endpoint security company looking for an expert-level Windows Kernel Driver Specialist to assist engineering team in developing next generation Endpoint Detection and Response (EDR) agent. We are looking for an experienced individual to join a team that is responsible for developing our cutting-edge collection, prevention and protection technologies using both documented and undocumented proprietary kernel mode techniques.
The team develops the core kernel technologies for a wide variety of products, from EDR to next-gen AV, including work that encompasses many aspects of kernel development, from infrastructure through filter drivers to function hooking, to name a few.

Level: Senior Engagement: Long-term contract Location: Europe (EU / EEA / UK), remote Working hours: EU business hours, shifted 2–3 hours later to ensure daily overlap with US West Coast (PST/PDT) mornings

About the Client

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role

We are looking for a Senior SDET to lead the design of automated test frameworks and testing strategy for a large-scale distributed data platform. You will own the quality of the query engine, connectivity layer, and backend services end-to-end — from framework architecture through CI/CD infrastructure across all major clouds — and mentor middle engineers on the team.

This is a data-heavy, backend-focused role. We are not looking for web/UI QA engineers — the work centers on validating distributed query execution, data correctness at scale, connectivity drivers, and backend microservices.

Responsibilities

• Architect, design, and evolve automated test frameworks in Python / pytest for backend services, REST APIs, and distributed data components.
• Define testing strategy for new features and platform components — coverage, risk assessment, and quality gates.
• Own end-to-end, integration, performance, and regression testing covering SQL query execution, data correctness at scale, and platform APIs.
• Lead performance and load testing efforts with JMeter, including workloads over JDBC / ODBC / Arrow Flight drivers.
• Design and validate large-scale data testing scenarios — query plans, result correctness across heterogeneous data sources, metadata consistency, and behavior under high concurrency.
• Own CI/CD test pipelines in Jenkins — architect, maintain, and continuously improve.
• Provision and manage test environments in Kubernetes (GKE / EKS / AKS) across GCP, AWS, and Azure using Docker; drive automation and reproducibility.
• Investigate complex, cross-layer failures and drive root-cause analysis with engineering.
• Mentor middle SDETs, review test designs, and set quality standards across the team.
• Partner with US-based development leads on shift-left practices, testability, and release readiness.

Required Qualifications

• Education: B.S. or M.S. in Computer Science, Computer Engineering, or a related technical field.
• Programming: Strong proficiency in Python, including pytest, with deep understanding of OOP, software design principles, and test framework architecture.
• SQL & Data: Advanced SQL skills and strong understanding of relational and analytical data systems, including query execution internals.
• Data-intensive testing experience: Demonstrated experience testing data-intensive systems — query engines, ETL/ELT pipelines, streaming platforms, or analytical databases. Candidates with only web/UI QA backgrounds are not a fit.
• Testing experience: 5+ years in backend/system test automation, with demonstrated ownership of test strategy and infrastructure.
• CI/CD & DevOps: Solid experience architecting and maintaining Jenkins pipelines and test environments.
• Containers & Orchestration: Strong working knowledge of Docker and Kubernetes (running workloads, debugging pods, deploying complex environments).
• Cloud: Hands-on experience with at least one major cloud (GCP, AWS, or Azure); exposure to more than one is a strong plus.
• Version Control: Confident with Git / GitHub workflows and code review practices.
• English: Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team.
• Availability: Able to work EU hours with a 2–3 hour shift toward US West Coast time to ensure daily overlap with the client team.
• Leadership: Prior experience mentoring engineers, defining test strategy, or leading a QA/SDET function.

Desired Skills

• Deep experience testing REST APIs and backend microservices at scale.
• Hands-on with distributed computing frameworks (e.g., Apache Spark, Kafka) and MPP SQL query engines (e.g., Presto, Trino, or similar).
• Strong understanding of modern data lakehouse concepts, open table formats (Apache Iceberg), and data warehousing.
• Experience with data connectivity drivers: JDBC, ODBC, Arrow Flight.
• Performance testing with JMeter or comparable load-testing tools at production scale.
• Kubernetes on managed services (GKE / EKS / AKS) and multi-cloud exposure.
• IaC tools such as Terraform.
• Deep understanding of query plan generation, query acceleration / materializations, and metadata integrity in distributed data systems.
• Prior experience leading a QA/SDET function in a data-platform or database engineering environment.
  Please note: We can consider only candidates currently residing in the EU, EEA, or the UK.

Level: Middle Engagement: Long-term contract Location: Europe (EU / EEA / UK), remote Working hours: EU business hours, shifted 2–3 hours later to ensure daily overlap with US West Coast (PST/PDT) mornings

About the Client

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role

We are looking for a Middle-level SDET to design and maintain automated tests for a large-scale distributed data platform. You will validate the correctness, performance, and reliability of the query engine, connectivity layer, and backend services across all major clouds.

This is a data-heavy, backend-focused role. We are not looking for web/UI QA engineers — the work centers on validating distributed query execution, data correctness at scale, connectivity drivers, and backend microservices.

Responsibilities

• Develop and maintain automated tests in Python / pytest for backend services, REST APIs, and distributed data components.
• Write end-to-end, integration, and regression tests covering SQL query execution, data correctness, and platform APIs.
• Support performance and load testing with JMeter, including workloads over JDBC / ODBC / Arrow Flight drivers.
• Validate data-intensive scenarios — query plans, result correctness across data sources, metadata consistency, and behavior under concurrency.
• Contribute to CI/CD test pipelines in Jenkins — configure, maintain, and troubleshoot.
• Provision and manage test environments in Kubernetes (GKE / EKS / AKS) across GCP, AWS, and Azure using Docker.
• Investigate failures across the stack — query engine, distributed services, drivers, infrastructure — and drive them to resolution with engineering.
• Collaborate with US-based developers on testability and quality gates.

Required Qualifications

• Education: B.S. or M.S. in Computer Science, Computer Engineering, or a related technical field.
• Programming: Strong proficiency in Python, including pytest, with a solid grasp of OOP and software design principles.
• SQL & Data: Strong SQL skills and solid understanding of how relational and analytical data systems work.
• Data-intensive testing experience: Hands-on experience testing data-intensive systems — query engines, ETL/ELT pipelines, streaming platforms, or analytical databases. Candidates with only web/UI QA backgrounds are not a fit.
• Testing experience: 3+ years in backend/system test automation or SDET roles.
• CI/CD & DevOps basics: Practical experience with Jenkins pipelines and deploying/maintaining test environments.
• Containers: Working knowledge of Docker and basic Kubernetes (running workloads, debugging pods, kubectl fluency).
• Cloud: Comfortable operating in at least one major cloud (GCP, AWS, or Azure).
• Version Control: Confident with Git / GitHub workflows.
• English: Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team.
• Availability: Able to work EU hours with a 2–3 hour shift toward US West Coast time to ensure daily overlap with the client team.

Desired Skills

• Experience testing REST APIs and backend microservices at scale.
• Familiarity with distributed computing frameworks (e.g., Apache Spark, Kafka) and MPP SQL query engines (e.g., Presto, Trino, or similar).
• Understanding of modern data lakehouse concepts, open table formats (Apache Iceberg), and data warehousing.
• Experience with data connectivity drivers: JDBC, ODBC, Arrow Flight.
• Performance testing with JMeter or comparable load-testing tools.
• Kubernetes on managed services (GKE / EKS / AKS) and multi-cloud exposure.
• IaC tools such as Terraform.
• Understanding of query plan generation, query acceleration / materializations, and metadata integrity in distributed data systems.
  Please note: We can consider only candidates currently residing in the EU, EEA, or the UK

Level: Senior Engagement: Long-term contract Location: Europe (EU / EEA / UK), remote Working hours: EU business hours, shifted 2–3 hours later to ensure daily overlap with US West Coast (PST/PDT) mornings

About the Client

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role

We are looking for a Senior Software Engineer to design, build, and own significant components of the core query engine of a large-scale distributed data platform. You will lead work across query planning, optimization, and execution — driving architectural decisions, mentoring middle engineers, and pushing the platform's performance and scalability boundaries across all major clouds.

This is a systems-level, backend engineering role focused on distributed data processing internals — not application development or CRUD services.

Responsibilities

• Architect, design, and implement significant components of the query engine — planner, optimizer, execution operators, memory management, and data access layers.
• Write and review high-quality, performance-critical code in Java and/or C++.
• Own end-to-end delivery of features from technical design through production rollout.
• Drive performance optimization work — profiling, benchmarking, and eliminating bottlenecks in latency- and throughput-sensitive paths.
• Integrate deeply with columnar formats, open table formats, and connectivity drivers.
• Mentor middle engineers, lead code reviews, and set technical standards for the team.
• Contribute to CI/CD architecture and quality processes across Jenkins, containerization, and multi-cloud deployment (GCP, AWS, Azure via Kubernetes / Docker).
• Debug complex, cross-layer issues spanning query planning, distributed execution, memory management, and I/O.
• Partner with US-based engineering leads on design reviews, architectural decisions, and roadmap execution.

Required Qualifications

• Education: B.S. or M.S. in Computer Science, Computer Engineering, or a related technical field.
• Programming: Strong proficiency in Java or C++, with deep understanding of OOP, systems design, memory management, and concurrency. Candidates strong in both are especially valued.
• SQL & Data: Advanced SQL skills and strong understanding of query execution internals — planning, optimization, and operator implementation.
• Data processing systems experience: Demonstrated experience building or extending data processing systems — query engines, distributed databases, ETL/ELT frameworks, or analytical platforms.
• Engineering experience: 5+ years in backend/systems software engineering, with a track record of owning significant components.
• CI/CD & DevOps: Solid experience with Jenkins and modern engineering workflows.
• Containers & Orchestration: Strong working knowledge of Docker and Kubernetes.
• Cloud: Hands-on experience with at least one major cloud (GCP, AWS, or Azure); exposure to more than one is a strong plus.
• Version Control: Confident with Git / GitHub workflows and rigorous code review practices.
• English: Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team.
• Availability: Able to work EU hours with a 2–3 hour shift toward US West Coast time to ensure daily overlap with the client team.
• Leadership: Prior experience mentoring engineers, leading technical designs, or owning components end-to-end.

Desired Skills

• Deep experience with Apache Arrow (columnar in-memory format).
• Hands-on experience with Apache Calcite (SQL parsing, planning, optimization framework).
• Experience with Gandiva or LLVM-based expression compilation and code generation.
• Experience with open table formats — Apache Iceberg, Delta Lake, or Hudi.
• Deep familiarity with distributed computing frameworks (e.g., Apache Spark, Kafka) and MPP SQL query engines (e.g., Presto, Trino, or similar).
• Deep understanding of query planning, optimization (cost-based, rule-based), and execution internals.
• Experience with data connectivity drivers: JDBC, ODBC, Arrow Flight.
• Kubernetes on managed services (GKE / EKS / AKS) and multi-cloud exposure.
• IaC tools such as Terraform.
• Track record of performance optimization at the systems level — profiling, vectorization, cache/memory-conscious design.
• Prior experience contributing to open-source data infrastructure projects.
  Please note: We can consider only candidates currently residing in the EU, EEA, or the UK

Level: Middle Engagement: Long-term contract Location: Europe (EU / EEA / UK), remote Working hours: EU business hours, shifted 2–3 hours later to ensure daily overlap with US West Coast (PST/PDT) mornings

About the Client

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role

We are looking for a Middle-level Software Engineer to work on the core query engine of a large-scale distributed data platform. You will develop features across query planning, optimization, and execution, contribute to performance-critical components, and help evolve the platform's ability to process massive analytical workloads across heterogeneous data sources.

This is a systems-level, backend engineering role focused on distributed data processing internals — not application development or CRUD services.

Responsibilities

• Develop and maintain features across the query engine — planning, optimization, execution, and data access layers.
• Write high-quality, performance-conscious code in Java and/or C++.
• Work with SQL semantics, query plans, and execution operators over large-scale distributed data.
• Integrate with columnar formats, open table formats, and connectivity drivers used across the platform.
• Contribute to CI/CD pipelines and automated testing — participate in build, test, and release workflows in Jenkins.
• Deploy and validate work in Kubernetes (GKE / EKS / AKS) across GCP, AWS, and Azure using Docker.
• Debug complex issues spanning query planning, distributed execution, memory management, and I/O.
• Collaborate closely with US-based engineering teams on design reviews, code reviews, and technical decisions.

Required Qualifications

• Education: B.S. or M.S. in Computer Science, Computer Engineering, or a related technical field.
• Programming: Strong proficiency in Java or C++, with solid OOP and software design fundamentals. Candidates comfortable with both are especially valued.
• SQL & Data: Strong SQL skills and solid understanding of relational and analytical data systems, including query execution concepts.
• Data processing systems experience: Hands-on experience with data processing systems — query engines, distributed databases, ETL/ELT frameworks, or analytical platforms.
• Engineering experience: 3+ years in backend/systems software engineering.
• CI/CD & DevOps basics: Practical experience with Jenkins pipelines and modern development workflows.
• Containers: Working knowledge of Docker and basic Kubernetes (running workloads, debugging pods, kubectl fluency).
• Cloud: Comfortable operating in at least one major cloud (GCP, AWS, or Azure).
• Version Control: Confident with Git / GitHub workflows.
• English: Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team.
• Availability: Able to work EU hours with a 2–3 hour shift toward US West Coast time to ensure daily overlap with the client team.

Desired Skills

• Experience with Apache Arrow (columnar in-memory format).
• Familiarity with Apache Calcite (SQL parsing, planning, optimization framework).
• Exposure to Gandiva or LLVM-based expression compilation.
• Experience with open table formats — Apache Iceberg, Delta Lake, or Hudi.
• Familiarity with distributed computing frameworks (e.g., Apache Spark, Kafka) and MPP SQL query engines (e.g., Presto, Trino, or similar).
• Understanding of query planning, optimization, and execution internals.
• Experience with data connectivity drivers: JDBC, ODBC, Arrow Flight.
• Kubernetes on managed services (GKE / EKS / AKS) and multi-cloud exposure.
• IaC tools such as Terraform.
• Experience with performance profiling and optimization of latency-sensitive systems.
  Please note: We can consider only candidates currently residing in the EU, EEA, or the UK.
  Please note: We can consider only candidates currently residing in the EU, EEA, or the UK

Join Whitechain — Build the Future of Web3!

At Whitechain, we’re on a mission to revolutionize blockchain, smart contracts, and cryptography. As part of the WhiteBIT ecosystem, we’re building cutting-edge Web3 solutions, from our own EVM blockchain to non-custodial wallets, DeFi platforms, and GameFi experiences.We’re looking for ambitious innovators to help us bridge the gap between retail and corporate blockchain adoption. If you’re passionate about decentralization, Web3, and shaping the future of digital economies, this is your chance to make an impact!

The future of Web3 starts with you — join us as a DevOps Engineer!

Requirements

— 3+ years in DevOps / SRE / infrastructure roles
— 1 year experience with blockchain/ crypto infrastructure background (Ethereum, OP Stack or similar)
— Strong Kubernetes: deployment, debugging, network policies, Helm
— Terraform (modules, state management, multiple providers)
— CI/CD with GitHub Actions or equivalent; GitOps principles
— AWS (IAM, VPC, EC2, S3, KMS)
— Confident Linux administration and Bash scripting
— Monitoring and alerting with Prometheus / Grafana
— Git and PR-based workflow

Responsibilities

— Operate and evolve Kubernetes clusters (testnet and upcoming mainnet) via ArgoCD and Helm
— Deploy, upgrade and troubleshoot OP Stack components: op-node, op-reth, batcher, proposer, conductor
— Maintain infrastructure as code: Terraform (AWS, Cloudflare) and Ansible for node configuration
— Own and improve CI/CD pipelines (GitHub Actions): image builds, registry publishing, automated IaC tag bumps
— Maintain monitoring and alerting (Prometheus, Grafana); respond to alerts for sequencer lag, batcher stuck, L1 sync, disk
— Participate in the on-call rotation after onboarding
— Follow and keep runbooks up to date; document on-chain and operational procedures
— Configure and protect public RPC endpoints (rate limiting, Cloudflare WAF)

Good to have

— Direct OP Stack experience (op-node, op-reth, batcher, proposer, conductor)
— ArgoCD and GitOps in production
— Ansible
— Cloudflare (WAF, rate limiting, CDN)
— Key management: AWS KMS or HashiCorp Vault
— Incident response experience and postmortem writing