Jobs at Djinni

🚀 Project Description

From the engineering side, this role is focused on Backend + Infrastructure / DevOps as secondary skillset, with strong ownership over the technical foundation of the features.
 

✅ You are:
 

• Have practical experience from commercial projects, pet projects, hackathons, or open-source contributions
• Confident with Java, with readiness to work close to ML workloads and model-serving pipelines
• Comfortable building backend services and REST APIs
• Understand System design, asynchronous processing, and service integration
• Have experience with Docker and deploying services in cloud environments
• Understand how to build and maintain CI/CD pipelines
• Have hands-on experience with AWS or similar cloud platforms
• Are comfortable working with PostgreSQL
• Understand logging, monitoring, environment setup, and deployment workflows
   

➕ Will be a plus:
 

• Experience with MLOps or model-serving infrastructure
• Experience deploying ML models for inference on CPU
• Familiarity with Python, FastAPI, Spring Boot, or similar backend frameworks
• Experience with AWS services or similar
• Understanding of job queues, background workers, and long-running processing workflows
• Familiarity with infrastructure-as-code tools such as Terraform or similar
• Comfortable working with AI platforms and developer tools such as Cursor, Claude Code, or Codex
   

♟️ What We Expect from You:
 

• Use modern AI tools, frameworks, and approaches to work faster and more effectively
• Make practical decisions that help us launch faster without unnecessary overengineering
• Proactively identify bottlenecks, propose solutions, and help shape technical decisions
• Be comfortable working in an evolving product with changing priorities and early-stage ambiguity
   

🔑 Responsibilities:
 

• Implement and enhance backend services 
• Actively collaborate with the team lead and team
• Maintain the initial cloud environment for development, testing, and production
• Build and support processing pipelines for model execution and result delivery
• Configure logging, monitoring, and basic operational observability
• Ensure the system is reliable, maintainable, and easy to extend
• Utilize AI to review pull requests and contribute to engineering best practices
   

🍩 What we offer:
 

• Opportunity to work on an innovative product in the medical-tech domain
• High ownership and direct impact on product architecture
• Flexible work hours within the European time zone
• A fast-moving environment where strong engineers can influence product and technical decisions
• Paid 200$+ AI assistants and modern engineering tooling
• Professional development support, latest courses and certifications
• 20 business days of vacation
• 5 sick leave days
• National holidays covered
   

🗣 Recruitment process:
 

✔️ Technical Task → ☑️ AI Live Coding Task → ✅ Cultural-Fit Interview → 🏁 Offer

We at Sigma Software are looking for a Senior Java Engineer to join an exciting project in the domain of audience segmentation and engagement. This is a remote role open to candidates from Ukraine and Europe, offering the opportunity to work with cutting-edge technologies and high-scale systems.

You will be part of a team building a real-time platform that powers communications, personalization, automation, and customer engagement across diverse ecosystems. At Sigma Software, we value innovation, collaboration, and technical excellence.

Why join us? You’ll work on challenging tasks, contribute to architectural decisions, and have the freedom to experiment with new technologies while improving data systems at scale.
 

Customer

Our customer is a leading EdTech company that uses AI and data-driven technologies to personalize learning experiences, optimize user engagement, and improve marketing effectiveness through advanced audience targeting and analytics.
 

Project

The project is a real-time platform that enables product teams and business stakeholders to define and manage dynamic user groups based on user attributes, relationships, behavioral events, and historical activity.

Responsibilities

• Design and implement core components of the audience segmentation platform
• Develop and evolve a flexible segment definition language supporting complex targeting scenarios
• Build scalable evaluation engines for processing large-scale entity and relationship data
• Implement relationship-based audience resolution across multiple entity types
• Optimize incremental recomputation for continuous data changes
• Create event-driven pipelines for real-time segment accuracy
• Ensure governance, auditability, and lifecycle traceability of segments
• Design low-latency resolution services for high-scale operations
• Develop caching strategies for dynamic segments and snapshots
• Optimize system performance, scalability, and operational efficiency
• Collaborate with product and engineering teams to define platform capabilities and architecture
• Provide technical leadership and contribute to architectural decisions

Requirements

• At least 5+ years of backend engineering experience
• Strong Java expertise
• Proven experience building distributed systems
• Knowledge of query engines, search platforms, rules engines, segmentation platforms, or analytics systems
• Strong understanding of data modeling and domain-driven design principles
• Experience with event-driven architectures
• Skilled in designing scalable APIs and backend services
• Strong problem-solving and performance optimization skills
• Experience with cloud-native architectures
• Ability to drive technical decisions and contribute to system architecture
• Upper-Intermediate+ English level
   

Will be a plus

• Experience with recommendation engines
• Knowledge of Quarkus
• Experience building Customer Data Platforms (CDP)
• Experience with marketing automation systems
• Expertise in audience segmentation or personalization platforms
• Familiarity with graph-based data models and relationship traversal
• Experience with search technologies (Elasticsearch, OpenSearch)
• Experience with stream processing technologies
• Experience with Google Cloud Platform
• Experience with large-scale analytics systems

Join a project where scalability, resiliency, and real-time communication are at the core of the engineering challenge. We are looking for a Senior Java Developer to help build a high-load multi-channel communications platform used to deliver critical notifications to millions of users worldwide.

As part of Sigma Software, you will work remotely in an international engineering environment and contribute to the development of distributed, event-driven systems with complex delivery pipelines and fault-tolerant architecture.

We at Sigma Software offer the opportunity to influence architectural decisions, work on long-term product development, and collaborate with experienced engineering teams building modern cloud-native solutions.

Customer

Our customer is a leading EdTech company that uses AI and data-driven technologies to personalize learning experiences, optimize user engagement, and improve marketing effectiveness through advanced audience targeting and analytics.

Project

The project focuses on building a modern multi-channel communications platform capable of delivering critical notifications across email, SMS, voice, and push channels at massive scale. The system supports automated workflows, emergency broadcasts, consent management, reporting and analytics, provider failover strategies, and real-time event processing.

Responsibilities

• Design and implement a scalable event-driven communications platform
• Build highly reliable and fault-tolerant message delivery systems
• Manage large-scale real-time event processing pipelines
• Design and implement multi-channel delivery pipelines across email, SMS, voice, and push channels
• Handle compliance requirements, consent management, and communication policies
• Support emergency and high-priority notification workflows
• Implement provider failover and resiliency strategies to ensure delivery continuity
• Build tracking systems for delivery status, retries, and engagement events
• Design and implement observability, reporting, and analytics infrastructure
• Develop event processing and message orchestration workflows
• Implement provider integrations and external messaging service adapters
• Ensure system scalability, throughput, and performance under high load
• Collaborate with product and engineering teams on communication flows and requirements
• Contribute to architectural decisions and long-term platform evolution
• Ensure operational stability, reliability, and maintainability of the system

Requirements

• At least 5 years of  software development experience
• Strong expertise in Java development
• Experience with distributed systems
• Strong experience with event-driven architectures
• Experience with messaging systems, queues, streams, and brokers
• Experience designing high-scale APIs and backend services
• Strong understanding of system reliability and fault tolerance

• Upper-Intermediate English level

   

Will be a plus:

• Experience with email or SMS delivery systems
• Experience with telecom or messaging infrastructure
• Experience with marketing automation platforms
• Experience with notification or engagement systems
• Experience with workflow engines
• Experience with compliance-heavy systems, including consent and GDPR-like regulations
• Experience with high-throughput event processing systems
• Experience with cloud-native platforms, preferably GCP

About the company:
Whizdom AI is an early-stage AI startup building products around recommendation systems, personalisation, and GenAI agents. The company is a small team working directly on real customer problems, shipping quickly, measuring outcomes, and iterating fast. Everyone here is expected to take ownership, improve systems proactively, and help build the engineering foundations the company will scale on.

The Role:

We are hiring a Founding AI Platform Engineer to own the systems that make the company's ML and GenAI products reliable, deployable, observable, and scalable. This role sits at the intersection of backend engineering, infrastructure, MLOps, and product delivery. You will build the production layer around training, evaluation, deployment, serving, CI/CD, experimentation, and monitoring. In a team of the company size, this role spans backend services, infrastructure, tooling, and reliability work. Your job is to make sure promising ML and GenAI capabilities become stable, customer-ready systems.

What You’ll Own:

• Build and maintain the infrastructure and tooling used to train, evaluate, deploy, and monitor ML models and GenAI services;
• Own production services, APIs, and pipelines that power recommendations, agent workflows, and customer-facing integrations;
• Improve CI/CD, testing, release workflows, rollback processes, and environment management;
• Establish observability across service health, model behaviour, agent quality, latency, cost, and failure modes;
• Build reproducibility and lifecycle practices for models, prompts, datasets, configurations, and releases;
• Support experimentation and measurement infrastructure so product and ML changes can be evaluated cleanly;
• Improve reliability, scalability, security, performance, and cost efficiency across the stack;
• Troubleshoot production issues end-to-end and turn recurring pain points into durable engineering improvements;
• Help define the platform and engineering standards the company will rely on as it grows.
   

What Success Looks Like in the First 6 Months:

• Shipping a model or GenAI change to production becomes faster, safer, and less manual;
• Core services and AI workflows are observable and easier to debug;
• The platform supports more usage with better reliability and lower operational friction;
• Engineers spend less time fighting infrastructure and deployment issues and more time shipping product;
• You become the person who can see platform, reliability, and scaling risks early and address them before they become problems.
   

What We’re Looking For:

• Strong software engineering background with experience building and operating production systems;
• Experience with backend services, cloud infrastructure, CI/CD, testing, observability, and automation;
• Strong Python skills and comfort working across services, tooling, infrastructure, and operational workflows;
• Good judgment about reliability, performance, maintainability, and cost tradeoffs;
• Ability to collaborate closely with ML and product teams and move ambiguous work to completion;
• High ownership, attention to detail, and a bias toward simplifying and strengthening systems.
   

Nice to Have:

• Experience with MLOps workflows for model training, evaluation, deployment, and monitoring;
• Experience serving ML models or LLM applications in production;
• Experience with experimentation platforms, event pipelines, analytics instrumentation, or feature delivery platforms;
• Experience with agent evaluation, prompt versioning, retrieval/search infrastructure, or vector-backed systems;
• Experience supporting customer-facing APIs or SaaS platform infrastructure.
   

A Note on Fit:

You do not need to have every tool on your resume to be a strong fit. We care about engineers who learn quickly, take ownership, and can build reliable systems in the real world.
 

Why Join:

• Direct access to the founders and real influence over the platform and engineering direction;
• High-ownership role with room to shape the production foundations of the company from the beginning;
• Opportunity to work on the systems behind recommendation engines and GenAI products that customers actually use;
• Flexible remote environment with strong overlap with European time zones preferred;
• Small team, low bureaucracy, and a lot of room to grow.
   

If you find this opportunity right for you, don't hesitate to apply or get in touch with us if you have any questions!

We are looking for a highly reliable and hands-on accounting specialist / financial accountant / tax clerk with strong experience in German bookkeeping and accounting rules.

The person will support us as a freelance accounting specialist and will be responsible for the ongoing bookkeeping of two German businesses: one sole proprietorship and one limited liability company. The role includes financial accounting, payroll accounting, preparation of monthly accruals and provisions, asset accounting, VAT topics, pre-tax deduction, year-end closing preparation and coordination with the tax advisor.

A strong understanding of German accounting is required, especially HGB, SKR04, German invoices, incoming and outgoing invoices, payroll postings, company car benefits, non-cash benefits, occupational pension schemes, accruals, provisions, equity bookings and the differences between sole proprietorships and corporations.

The candidate must be able to read and understand German documents, invoices and accounting records. Spoken German is not mandatory, but the ability to read and interpret German invoices, contracts, payroll documents and tax-related communication is essential.

Strong IT skills are very important. The person must be comfortable working with browser-based cloud software, digital document processing, accounting systems and data exchange with tax advisors. Experience with DATEV is a plus, but the role is not limited to DATEV. The candidate should understand how accounting data can be imported from previous systems, how prior-year values can be transferred, and how accounting data can be exported or provided to a tax advisor through interfaces or structured data formats.

We are looking for someone very careful, structured and accurate, but also proactive and solution-oriented. This is not a role for someone who stops working whenever something is unclear. We need someone who investigates, organizes missing invoices, requests documents independently, documents processes internally and actively helps keep the business administration running.

Main responsibilities:

• Ongoing bookkeeping for two German entities
• Processing incoming and outgoing invoices
• Reading and interpreting German invoices and accounting documents
• Payroll accounting and payroll-related postings
• Posting salaries, freelancer invoices and recurring monthly transactions
• Handling company car benefits, non-cash benefits and occupational pension topics
• Monthly accruals, provisions and period-end closing tasks
• Asset accounting
• VAT, input VAT and tax-related bookkeeping topics
• Preparation of year-end closing documentation
• Communication with the tax advisor and, where needed, the tax office
• Import and transfer of accounting data from previous systems
• Export and handover of accounting data to the tax advisor
• Internal documentation of accounting processes
• Proactively requesting missing documents and solving operational accounting issues

Required skills:

• Experience with German bookkeeping and accounting
• Strong understanding of HGB and SKR04
• Experience with financial accounting and payroll accounting
• Experience with year-end closing preparation
• Ability to read and understand German invoices and accounting documents
• Good IT skills and experience with digital accounting workflows
• High attention to detail
• Strong ownership, initiative and hands-on mentality
• Ability to work independently as a freelancer

Nice to have:

• Experience with DATEV or similar German accounting systems
• Experience with cloud-based accounting tools
• Experience working remotely for German companies
• Experience with both sole proprietorships and German limited liability companies

Position Summary

A U.S.-based language services company is seeking a Business & Finance Coordinator to support both the Operations and Accounting departments. This position is responsible for assisting with invoicing, client follow-up, interpreter and translator onboarding, work authorization verification, payroll system connection, and global recruitment based on active language needs and demand tracking. The ideal candidate will be organized, multilingual, detail-oriented, and comfortable working across international teams

Key Responsibilities

Finance & Accounting Support

• Assist the Accounting Manager with invoicing and payment follow-up.
• Help track client payments and outstanding balances.
• Support QuickBooks or financial record updates.
• Maintain organized billing and payment documentation.

Client Relationship & Business Follow-Up

• Follow up with current clients by email and phone.
• Schedule and manage client follow-up appointments.
• Maintain strong communication with existing clients.
• Identify client needs and report updates to management.

Interpreter & Translator Onboarding

• Search for and onboard interpreters and translators globally.
• Recruit language professionals based on active language demand tracking.
• Collect resumes, credentials, certifications, and work experience documentation.
• Schedule onboarding video calls and assist with work authorization verification.
• Ensure timely completion of required onboarding documents.
• Connect approved interpreters and translators to the payroll system.
• Maintain accurate interpreter and translator profiles.

Operations Support

• Serve as a liaison between the Operations and Accounting departments.
• Support interpreter scheduling and assignment coordination.
• Track active language demand and recruitment priorities.
• Maintain internal records, reports, and daily administrative tasks.

Qualifications

Required

• English proficiency at C2 level (native or near-native), written and spoken.
• Fluency in two to three languages, including English.
• Strong email communication and follow-up skills.
• Experience in administration, operations, finance, recruiting, or client support.
• Ability to work with international candidates and remote teams.
• Comfortable with video calls, spreadsheets, payroll systems, and CRM tools.
• Strong attention to detail.

Preferred

• Experience with QuickBooks or accounting support.
• Experience onboarding contractors, interpreters, translators, or remote workers.
• Background in interpreting, translation, healthcare, legal, or language services.
• Knowledge of payroll systems and document verification.

Schedule, Compensation & Terms

Schedule: Monday – Friday, 8:00 AM – 5:00 PM

Starting Rate: $6.00/hour | $48.00/day |

(New York Time)

Hours: 8 hours/day (1-hour unpaid lunch) | 40 hours/week

Payroll: Once per month, paid on the 15th of the following month

Paid Time Off (PTO)

• 10 paid days off total per year.

$240.00/week | $960.00/month

Probation: 6-month probation period

Contract: 1-year contract offered upon successful completion, contingent on performance, conduct, attendance, and organizational needs

• This position does not follow U.S. public holidays. PTO days may be taken according to the worker’s preferred holidays and cultural observances.
• Any additional time off beyond the 10 paid days requires a minimum of 2 weeks’ advance notice and may be taken as unpaid leave for up to 1 month.

This is a remote, internationally-based position. Compensation is structured for candidates located outside the United States.

How to Apply

Start date: July 15, 2026. Interested candidates must submit both a resume and EF SET English test results to be considered.

Step 1 — Take the EF SET English Test (free):

www.efset.org

Step 2 — Send your resume and EF SET results 

Only candidates who submit both a resume and EF SET test results will be considered.

Empowering People by Giving Them a Voice

We are looking for a Project Manager to join Sigma Software’s IT Solutions department and lead cross-functional transformation initiatives across the company. In this role, you will coordinate enterprise-level projects focused on process optimization, automation, and adoption of modern digital and AI-driven solutions

You will work in a complex environment with multiple stakeholders, balancing strategic goals with operational delivery while ensuring measurable business value. The position is open in a remote or hybrid format depending on your location

We at Sigma Software continuously invest in internal innovation and digital transformation to provide our employees with the best tools and environments for effective work. This role offers the opportunity to influence company-wide initiatives, work with modern technologies, and contribute to the adoption of AI-supported approaches across the organization

CUSTOMER 

Sigma Software’s IT Solutions department is responsible for building and evolving internal organizational capabilities through the implementation and development of business applications and digital solutions. The department supports multiple business functions across the company and focuses on improving operational efficiency, collaboration, automation, and employee experience through modern technologies and transformation initiatives.

PROJECT 

The project portfolio includes enterprise-wide transformation initiatives aimed at improving operational efficiency, optimizing internal processes, and implementing scalable digital and AI-powered solutions across the company. The Project Manager will coordinate multiple parallel initiatives involving business and technical stakeholders while ensuring transparent delivery, effective communication, and incremental business value

Key Technologies: Azure DevOps, Confluence, Enterprise Collaboration Tools, Automation Platforms, AI-assisted Productivity Tools

Job Description

• Plan, manage, and monitor project execution to ensure delivery on time and within budget
• Drive end-to-end project lifecycle management using appropriate delivery methodologies and best practices
• Lead cross-functional transformation initiatives involving multiple business units and internal teams
• Align business and technology stakeholders around project goals, priorities, and expected outcomes
• Identify opportunities for process optimization, automation, and operational efficiency improvements
• Promote and support the adoption of AI-driven approaches within project delivery and workflows
• Perform risk analysis and proactively manage delivery risks and dependencies
• Monitor project KPIs and implement corrective actions when needed
• Ensure transparent communication and structured project documentation
• Coordinate and support delivery teams, including onboarding and professional growth activities
• Contribute to the continuous improvement of delivery processes and project management practices

Qualifications

• At least 5 years of experience in project management
• Proven experience managing cross-functional or transformation initiatives
• Experience working in enterprise environments with multiple stakeholders and parallel projects
• Strong understanding of project management methodologies and delivery frameworks
• Experience collaborating with technical teams and managing IT-related projects
• Understanding of modern technologies, integrations, and automation approaches
• Knowledge of Agile, Scrum, Kanban, or hybrid delivery approaches
• Strong risk management and decision-making capabilities
• Awareness of AI capabilities and willingness to integrate AI into workflows
• Intermediate English level or higher

Will be a plus

• Experience with enterprise digital transformation programs
• Experience implementing automation or AI-driven business solutions
• PMP, PRINCE2, Agile, or similar certifications
• Experience with process improvement methodologies

Personal Profile

• Proactive and ownership-driven mindset
• Strong organizational and prioritization skills
• Strong communication and stakeholder management skills
• Excellent leadership, negotiation, and problem-solving abilities
• Ability to work effectively in dynamic environments
• Collaborative and team-oriented approach
• Strong analytical and strategic thinking
• Ability to build trust with stakeholders across different business functions
• Continuous improvement mindset and openness to innovation

We are a Ukrainian outsourcing company Join.To.IT, founded in 2012, delivering software solutions across various business domains.

We’re looking for a Manual QA Engineer who is detail-oriented, proactive, and passionate about delivering high-quality software.

We Offer

• Modern office near Vasylkivska metro station with a shelter, Starlink, and uninterrupted power supply
• Standard working hours: 10:00 AM – 7:00 PM (Monday–Friday)
• Opportunity to contribute to QA processes and introduce new ideas
• Free parking for cars and bicycles
• Friendly and supportive team
• Regular performance reviews
• Medical insurance
• Free gym membership near the office
• Compensation for English classes and professional development

Requirements

• 1+ year of commercial experience as a Manual QA Engineer in an outsourcing company
• Upper-Intermediate (B2) English or higher, with confidence in client communication
• Good understanding of web application architecture and client-server interaction
• Experience with manual testing of web and mobile applications
• Experience reviewing and testing project documentation
• Experience creating and maintaining test documentation (test cases, checklists, user stories, bug reports)
• Experience testing REST APIs using Postman
• Good understanding of SDLC, STLC, and Agile methodologies
• Experience estimating testing efforts
• Ability to work on multiple projects simultaneously

Responsibilities

• Plan and execute testing activities
• Analyze project requirements and documentation
• Create and maintain test documentation
• Perform manual testing of web and mobile applications
• Participate in team and client meetings
• Prepare test reports and QA metrics
• Contribute to improving QA and development processes
• Perform other QA-related tasks assigned by the Team Lead

Job Description

•1+ years experience in writing, technical documentation, and support developer/tester audience with the project related documentation.
•Fluent English (Advanced and upper)
•Technical background/education
•Experience writing, proofreading and editing.
•The ability to produce and organize content with a logical flow and per established templates.
•Team player

Job Responsibilities

Create and maintain internal and external documentation for technologies and tools used.
Work closely with engineering and product teams to ensure the quality, discoverability, and accuracy of the content you create and develop.
Design, write, and edit technical and process documentation.
Work with different documents control tools to create/update/release project related documents

Department/Project Description

Work on Medical project and to be a part of the team as a person responsible for the quality, discoverability and accuracy of the content. Do hands-on research and obtain necessary technical content from subject matter experts while translating it into clear, concise, structured documentation.

Simply Contact is looking for a proactive Account & Sales Specialist to develop our IT Help Desk and Managed IT Services business across Europe.

Key Responsibilities

• Develop and expand the European client portfolio (IT Help Desk, Service Desk, Managed IT Services);
• Identify and attract new B2B clients through outbound sales, networking, and partnerships;
• Conduct client meetings, presentations, and commercial negotiations;
• Prepare proposals and support tender participation;
• Manage existing client relationships and identify upsell/cross-sell opportunities;
• Coordinate between clients and technical delivery teams.

Requirements

• 2+ years in Sales, Business Development, Account Management, or Customer Success;
• B2B sales experience with a focus on new business development;
• Understanding of IT services, outsourcing, or managed services — a strong advantage;
• Experience with international clients;
• Strong communication and negotiation skills;
• English advanced;
• Self-motivated and results-oriented.

We Offer

• Building a new business direction within an international company;
• European client portfolio;
• Professional growth and flexible work format;
• Competitive salary + performance-based bonus.

We are looking for a Junior Social Media Buyer, who will help manage media buying activity from networks such as TikTok and Facebook.

Responsibilities:

• Support for Media Buyer to manage activity from TikTok, Facebook
• Launch and manage ads campaign from TikTok, Facebook
• Monitor campaign statistics, optimize the effectiveness of campaigns, and investigate traffic drops;
• Monitor costs and return on investment (ROI).
• Track the market for trends, opportunities, etc., and use that information to make recommendations
• Cooperate with other departments (creative, tech, analytics)

Requirements:

• Excellent analytical skills
• Target-oriented, driven, and ambitious person
• Excellent interpersonal skills
• Intermediate English

We offer:

• Friendly working atmosphere
• Interesting projects and challenging tasks
• Opportunities for self-realization, professional and career growth
• 5-day work-week in a friendly work environment
• Flexible working hours

We are looking for a Media Buyer/Team Lead in the Search Feeds Vertical to help manage media buying activity across networks such as TikTok and Facebook.

Responsibilities:

· Manage activity in TikTok, Facebook

· Monitor campaign statistics, optimize the effectiveness of campaigns, and investigate traffic drops;

· Monitor costs and return on investment (ROI).

· Track the market for trends, opportunities, etc., and use that information to make recommendations

· Cooperate with other departments (creative, tech, analytics)

Requirements:

· 1+ year of proven media buying experience in social networks

· Excellent analytical skills

· Target-oriented, driven, and ambitious person

· Excellent interpersonal skills

We offer:

· Friendly working atmosphere

· Interesting projects and challenging tasks

· Opportunities for self-realization, professional and career growth

· 5-day work-week in a friendly work environment

· Flexible working hours

Want to work on technologies used by data platforms at a global scale?

We're looking for Senior and Middle+ Java Engineers to join a long-term cloud data infrastructure project focused on modern Data Lakehouse technologies, distributed systems, and open-source development.

You'll be building integrations between data processing frameworks and cloud services, improving compatibility across the ecosystem, and contributing to technologies that power large-scale analytics platforms. If you enjoy solving complex backend challenges and working close to the open-source community, this role is for you.

What you'll be working on

• Develop new features for large-scale data infrastructure components.
• Build integrations between distributed data processing frameworks and cloud storage services.
• Improve compatibility across modern data processing engines.
• Contribute to high-quality, production-grade backend services.
• Participate in architecture discussions and technical design.
• Collaborate with engineers across international teams and contribute to engineering best practices.

Tech stack

Must have

• Java
• Python (working proficiency)
• Experience with at least one of: Apache Flink, Spark, Kafka, or Apache Beam
• Understanding of Data Lake / Lakehouse architecture
• Experience with Google Cloud Platform (BigLake, GCS, KMS, or related services)

Nice to have

• Apache Iceberg
• Open Source contributions
• Experience with distributed systems
• Cross-system integration experience

What we're looking for

• Strong commercial experience with Java backend development.
• Experience building data-intensive or distributed backend systems.
• Solid understanding of cloud-native architectures.
• Experience working with modern data processing technologies.
• Strong problem-solving skills and ownership mindset.
• Good communication skills and ability to work in a distributed international team.

Working conditions

• 🌍 Remote
• 🌎 Collaboration with US-based engineering teams
• ⏰ Daily overlap by 10:00 AM PST
• 📅 Long-term project
• Flexible working schedule (8-hour workday)

What we offer

• Paid vacation and sick leave
• 11 official public holidays per year
• Personal Career Development Plan (CDP)
• Challenging engineering projects with modern cloud technologies
• Paid external training, conferences, and professional certifications
• Internal tech talks, workshops, and English classes
• Employee support program (healthcare, legal assistance, partner discounts)
• Corporate library with paper and e-books

If you're excited about distributed systems, cloud data platforms, and building software that makes an impact beyond a single product, let's talk!

Apply now or send us a message - we'd love to share more details about the project and see if it's the right fit for you.

Tango is a successful, marketleader, a live-streaming Platform with 450+ Million registered users, in an industry projected to reach $240 BILLION in the next couple of years. 

The B2C platform, based on the best-quality global video technology, allows millions of talented people around the world to create their own live content, engage with their fans and monetize their talents.

Tango live stream was founded in 2018 and is powered by 300+ global employees operating in a culture of growth, learning, and success!

The Tango team is a vigorous cocktail of hard workers, creative brains, energizers, geeks, overachievers, athletes, and more. We push the limits to bring our app from “one of the top” to “the leader”. 

The best way to describe Tango's work style is not to use the word “impossible”. And we believe that success is a thorny path that runs on sleepless nights, corporate parties, tough releases, and of course our users' smiles (and as we are a LIVE app, we truly get to see our users all around the world smiling right in front of us in real-time!).  

Responsibilities

• Development and support of SPA on ReactJS: web version mobile-first of a high-load application, admin panels for internal use, and marketing pages
• Collaborate with other teams to effectively meet the product and technical needs of the project
• Proactively participate in improvements and existing solutions tuning
• Share expertise and knowledge with your teammates

Requirements

• At least 7 years of commercial experience in development in JS (ES6+)/Typescript
• Strong knowledge of CSS, HTML5, SASS, Jest
• At least 2 years of commercial experience in development in with ReactJS version 16+ (hooks)
• Experience with state management frameworks: Redux and Redux toolkit preferred
• Intermediate English

What we offer:

• International company with several offices in different locations : Tel-Aviv, Kyiv, Warsaw, Limassol.
• Granting an Option;
• A professional environment with great people to work with;
• Competitive salary, performance review;
• Flexible working hours, no one here tracks your work time because our culture is built on trust and cooperation;
• Social package, including sports coverage, elite medical insurance for you and family;
• 20 working days paid vacation and 100% sick leaves coverage;
• Opportunities to make a difference, to develop and grow;
• Regular corporate celebrations, team buildings and fun activities;
• Comfortable office close to the metro station. Our Kyiv office is open 24/7 with all safety and health measures in place.

About the Client

Our client, Rezono, is a performance marketing agency and a trusted partner of leading advertising platforms, including Meta, TikTok, Google, Snapchat, and NewsBreak. The company helps advertisers, publishers, and media buying teams scale their campaigns by providing platform expertise, premium account solutions, and dedicated support across multiple industries and markets.
 

About the Role

Our client is looking for a Strategic Business Development Manager to own and develop relationships with key advertising platforms. The successful candidate will be responsible for strengthening existing partnerships, negotiating better commercial terms, unlocking exclusive platform opportunities, and driving long-term business growth.
 

Key Responsibilities

• Build and maintain strategic relationships with Meta, TikTok, Google, and other advertising platforms
• Negotiate rebates, credit lines, payment terms, and other partnership benefits
• Secure access to beta programs, exclusive features, and dedicated platform support
• Manage partnership escalations and represent the agency in strategic discussions
• Collaborate with internal teams to maximize platform performance and business results
   

Requirements

• Experience managing strategic partnerships with major advertising platforms, including Meta or TikTok
• Proven experience negotiating commercial partnership terms and building long-term business relationships
• digital advertising / affiliate marketing ecosystems
• Strong communication and stakeholder management skills
• Fluent English
   

Nice to Have

• Chinese language proficiency
• Existing relationships with platform partner managers
• Experience working with additional advertising platforms such as Google, Snapchat, or NewsBreak
   

What Rezono Offers

• 100% remote job
• Flexible types of contract
• Profit-sharing bonus based on personal performance
• Opportunity to shape processes from an early stage
• Collaborative and transparent working environment
• Comprehensive benefits package
• Business trips to meet platform partners and attend industry events