Jobs at Djinni

The Senior Backend Engineer will develop and support microservices related to billing and subscription management, focusing on performance, reliability, and scalability. 
This role involves developing a SaaS platform based on PHP services and integrating the services with payment gateways and payment orchestrators.
 

Responsibilities:

• Build and maintain microservices for subscription lifecycles, billing retries, and payment handling.
• Work on APIs for managing subscriptions, invoicing, and payment gateways.
• Optimize billing systems for performance and scalability, ensuring they can handle large volumes of transactions.
• Collaborate with the analytics team to implement accurate billing cycles and manage financial reporting.
• Ensure all services adhere to secure communication standards and manage interactions with external orchestrators.
   

What we look for:

• 5+ years of experience with PHP in backend development.
• 2+ years of experience with Go or similar language.
• 2+ years of experience working with billing systems, including subscription management, payment processing, and handling chargebacks.
• Familiarity with modern PHP frameworks (Laravel, Symfony, etc.) and best practices for building scalable microservices in a cloud-native environment.
• Familiarity with k8s, Victoria Logs, Docker , PostgreSQL, Grafana and Prometheus, particularly for monitoring billing services.
• Experience with SQL and NoSQL databases used in billing systems.
• Experience with RESTful APIs, gRPC, and message queues used for financial systems.
• Nice to have: Experience with RoadRunner and Temporal.
   

We offer:

• A supportive atmosphere — we’re all for creativity and providing opportunities for self-fulfillment.
• Working on inspiring products in a team of supportive professionals.
• A competitive salary package based on your unique expertise, skillset, and impact on the product.
• Reimbursement of professional courses and trainings.
• In-office, and hybrid/remote work opportunities.
• Flexible working hours.
• Professional equipment and access to the necessary programs.
• Paid vacations, sick days, and other benefits.
• Medical insurance.
• Free lunches in the office.
• A variety of corporate events and team-building activities.

Who We Are Looking For:

An ambitious, driven, and energetic individual with a passion for sales and technology. Someone who is ready to take on challenges, work in a fast-paced environment, and close deals in the IoT and Cloud industries.

Responsibilities:

- Identifies, qualifies, and cultivates new sales opportunities through multiple mediums (email, phone, trade shows, inbound website leads, and more).

 - Maintains a high level of attention to detail managing all respective sales activities (notes, follow-ups, emails, call logs) within CRM tool.

 - Responds to inquiries via email, LinkedIn, other social networks.

 - Responsible for achieving aggressive weekly targets such as number of qualified opportunities per campaign, number of daily activities/tasks, call quality, appointment setting, and sales skills.

 - Qualifying potential opportunities and scheduling initial product presentations between prospects and our sales team.

 - Over time, Sales Manager will also be conducting product demonstrations for prospective customers and will develop into a product expert.

Requirements:

- Experience: 1+ year in sales (preferably in an international market, outside Ukraine)

 - Education: Bachelor's degree in industrial, engineering, or IT-related fields

 - Skills:

• Basic understanding of IoT, Cloud, SaaS, and PaaS
• Strong negotiation and deal-closing abilities
• Hands-on experience with CRM tools
• Experience in direct client communication and stakeholder management
• Ability to manage technical implementation or transformation programs
• Familiarity with modern cloud architectures
• Willingness to travel for exhibitions and seminars
•  - Languages: English (B2–A1 level)
•  - Mindset: High motivation, strong work ethic, and a results-driven approach
•  - Mobility: Readiness for business trips

What We Offer:

- A fast-growing and innovative work environment

 - Competitive salary with an attractive commission model

 - Opportunities for international networking and career growth

 - Dynamic and supportive team

 - Work flexibility: Hybrid / Remote options available

Are you ready to build your career in IoT and Cloud sales

Are you an innovative, customer-focused PRO? At Mojam, we’re looking for a CRM Marketing Manager who’s ready to shake things up and revolutionize how we connect with our players! 🚀 If you’re passionate about creating personalized customer journeys and driving retention, we want you on our team. Help us elevate our CRM strategies and build stronger relationships with our community.

⚡️ What to do :
 

• Manage and optimize the CRM platform to enhance customer engagement, segmentation and personalization
• Develop and implement a comprehensive CRM strategy, including email, web push, and on-site communications, to increase customer retention and engagement
• Design and execute customer segmentation strategies to ensure relevant and targeted messaging to different customer segments
• Utilize A/B testing to continuously improve CRM activities effectiveness
• Monitor, analyze, and report on the performance of CRM initiatives, making data-driven recommendations for optimization and improvement
• Collaborate with the Marketing, Product, and Analytics teams to align CRM activities with overall company goals and strategies
• Control production of all necessary materials
• Stay up to date with the latest industry trends, best practices, and emerging technologies related to customer retention and CRM 

🦸 Your superpowers

• 2+ years of experience in CRM/ Retention/Email Marketing
• Proficient in using CRM platforms and marketing automation tools
• Detailed expertise in email, web push, on-site communication retention strategies
• Analytical and data-driven, with the ability to interpret customer data and make informed decisions on CRM initiatives
• Strong copywriting skills, possessing the ability to produce engaging and persuasive content tailored to different customer segments
• Exceptional communication and interpersonal skills, with the ability to collaborate effectively across departments
• Results-oriented mindset with a focus on driving measurable improvements in customer retention metrics and CRM performance
• Continuously seeking opportunities to innovate and improve retention strategies and CRM processes
• Upper-intermediate (B2)
• HTML and CSS proficiency

Being well-acquainted with the gaming industry, having a passion for video games (CS ideally) would be a substantial asset.

🍪Team Perks

• Totally remote work from wherever you grind. Into coworking? We’ve got your back
• Flex schedule with no time tracking, because our goal is results
• Work gear on us, get the tech you need
• Half-year bonus Twice a year every mojamer receives a sweet bonus as a nod to our shared achievements
• Health buffs: compensation for sports and mental health, paid sick leaves, and 18 days for vacation
• Skill boosts: we cover training, certs, UA and ENG classes, and pro tips from our top mojamers
• Day-offs and gifts on important dates that you choose yourself (birthday, work anniversary, child’s birth, wedding)
• A squad of PRO&BROs to craft epic gaming worlds with! 

Ready to elevate CRM to new heights 😉? We’re excited to see your CV and hopefully welcome you aboard! Let’s add more jam together 🚀

Requirements

• Strong Delphi 7 expertise (primary requirement)
• Experience with FreePascal/Lazarus (secondary requirement)
• Knowledge of WebSocket communication and client-server architecture
• Experience with SVN, Jenkins (CI/CD), and Jira
• Familiarity with cross-compiler development (Delphi/FPC)
• Ability to work with legacy systems and maintain code stability
• Understanding of Agile development practices

Responsibilities

• Develop and maintain code in Delphi 7, ensuring compatibility with FreePascal
• Support both legacy GUI and new web application via shared server component
• Participate in Agile ceremonies (planning, stand-ups, reviews, retrospectives)
• Track tasks in Jira and maintain Jenkins build configurations
• Write clean, maintainable code and follow existing patterns
• Perform cross-platform testing and deployment (Windows & Linux)

Optional / Nice-to-Have

• Experience with mORMot framework (WebSocket server, logging, daemon)
• Knowledge of FastMM4 (memory management)
• Background in business calculation/estimation software
• Hands-on experience with CI/CD pipeline optimization
• Familiarity with performance tuning in Delphi/FPC

We Offer

• Competitive salary
• Flexible schedule
• Social package
• Courses, webinars, seminars to increase professional skills
• Snacks & fruit, foosball, fun office environment
• Horizontal hierarchy. No micromanagement pressure
• Open company culture where your ideas and initiatives are valued
• Regular team building & corporate events
• International projects

At Time2Mobile, we craft cutting-edge mobile applications that help businesses scale and connect with their users. We are currently expanding our iOS team and looking for a skilled Middle Swift Developer who is passionate about mobile technologies and eager to work in a dynamic remote-first environment.

Position Overview:
As a Middle Swift Developer, you will be responsible for designing and building robust iOS applications. You should have a solid background in Swift and experience working with RESTful APIs, design patterns, and Apple’s ecosystem. Fluent spoken English is essential for daily communication with international clients and the team.

Responsibilities:

• Develop, test, and maintain native iOS applications using Swift
• Collaborate closely with UI/UX designers and backend developers
• Participate in architectural decisions and code reviews
• Communicate project progress and updates clearly in English
• Troubleshoot, debug, and optimize code for performance

Requirements:

• 2+ years of professional experience in iOS development with Swift
• Proficient in UIKit, SwiftUI, and Apple Human Interface Guidelines
• Solid understanding of MVVM or other design patterns
• Experience with Git, REST APIs, and third-party libraries
• Strong spoken English (B2+ or higher)

Nice to Have:

• Experience with Combine, CoreData, or Firebase
• Published apps on the App Store
• Familiarity with agile methodologies

What We Offer:

• 100% remote work with flexible hours
• Work on international projects with real impact
• Supportive team culture with regular knowledge sharing
• Professional development opportunities

How to Apply:
Send your CV, GitHub/App Store links

We are looking for a motivated individual to join our small team and work on various projects focusing on: e-commerce development and Spring Boot programming.

You will be working closely with the Team Lead, who will also serve as your mentor. He will always be available to assist you and answer your questions, but will also require high-quality and timely execution of tasks.

📝 Key Requirements & Details

• Position: Junior Java Developer (Remote)
• Technologies: Java, Spring Boot, SQL, JPA, MongoDB
• English Level: Intermediate (B1/B2)
• Mandatory Languages: Ukrainian or Russian is required.
• Work Schedule: 10:00 AM – 7:00 PM Kyiv time (EET)
• Location: Remote
• Experience: We are considering candidates with work experience (not necessarily commercial).
• Test Assignment: A mandatory test assignment will be provided after the initial introduction (you will have two days for completion).
• Salary: $500/month, paid twice a month via a convenient method for you (crypto, bank card, or other options).
   

We are interested in long-term cooperation.

Position overview

DataArt is a global software engineering firm and a trusted technology partner for market leaders and visionaries. Our world-class team designs and engineers data-driven, cloud-native solutions to deliver immediate and enduring business value.

We promote a culture of radical respect, prioritizing your personal well-being as much as your expertise. We stand firmly against prejudice and inequality, valuing each of our employees equally.

We respect the autonomy of others before all else, offering remote, onsite, and hybrid work options. Our Learning and development centers, R&D labs, and mentorship programs encourage professional growth.

Our long-term approach to collaboration with clients and colleagues alike focuses on building partnerships that extend beyond one-off projects. We provide the ability to switch between projects and technology stacks, creating opportunities for exploration through our learning and networking systems to advance your career.

Gain practical experience, enhance your skills, and master independent work on real IT projects.
Demonstrate your expertise during the trial period, and if you meet the professional standards, you’ll earn the Junior QA qualification—with the opportunity to join DataArt full-time.

Requirements

• Basic knowledge of manual testing (types of tests, methodologies of organizing testing processes, test design techniques)
• Basic knowledge of databases and skills working with at least one of database management systems (one of the following: MSSQL, Oracle, MySQL, PostgreSQL, etc.)
• Good interpersonal skills
• Excellent spoken English

Nice to have

• Practical and/or theoretical knowledge of API and mobile testing

We are looking for a skilled Middle Manual QA Engineer.

✅ Requirements:

✔️ 2+ years of related work experience

✔️ Solid knowledge of testing processes, methodologies, and standards

✔️ Experience in web projects testing

✔️ Experience in defining scope of testing, developing testing approach

✔️ Attentive to detail, analytical skills, and a scientific approach to problem-solving

✔️ Basic SQL knowledge

✔️ Strong verbal/written communication & an excellent attention to detail

✔️ Knowledge of JIRA and/or similar bug tracking tools

✔️ Experience in test documentation creation and maintenance experience in defining scope of testing, test plan, writing test cases,

✔️ Intermediate+ level of English (both verbal and written)

✅ Will be a plus 

✔️ Experience in I18n,l10n testing 

✔️ Experience in API testing

✔️ Knowledge of Azure Data Factory

✅ Duties and opportunities

✔️ Manual testing of web applications

✔️ Defects management in the bug-tracking system

✔️ Test documentation management

✔️ Collaboration with project team

Project Description

The project is a high-load DeFi infrastructure focused on building scalable, reliable backend services for financial and Web3 products. The team develops and maintains a microservices-based architecture that powers core platform functionality and public APIs used by both internal services and external integrators. The system is designed for high performance, low latency, and strong operational stability in a blockchain-driven environment.

Responsibilities

• Develop and maintain scalable backend microservices using Node.js and Nest.js
• Design and implement high-performance, low-latency APIs
• Ensure system reliability through monitoring of technical and business metrics (uptime, error rates, etc.)
• Perform system profiling and optimize database queries for high throughput
• Write clean, well-documented code in compliance with internal standards and guidelines
• Set up and maintain alerting systems; participate in incident detection and mitigation
• Take part in code reviews, architecture discussions, and agile sprint planning
• Collaborate closely with cross-functional teams

• Continuously evaluate and introduce new tools and technologies to improve system performance and team efficiency

   

Requirements

• Proven experience in fintech, DeFi, or cryptocurrency domains
• Hands-on experience building high-load microservices architectures
• Advanced proficiency in Node.js and TypeScript
• Strong SQL knowledge and hands-on experience with PostgreSQL
• Familiarity with Redis and message brokers (e.g. NATS, EMQX, Kafka)
• Experience with monitoring tools such as Prometheus and Grafana
• Solid understanding of blockchain fundamentals, Web3 concepts, and Solidity
• Basic DevOps knowledge: CI/CD pipelines, Docker, Kubernetes fundamentals
• Experience configuring metrics pipelines and alerting systems
• Experience working in Scrum-based environments with a structured, enterprise-oriented approach
• Strong communication skills, proactive mindset, and problem-solving attitude

• Willingness to work in a hybrid format (at least 3 days per week on-site)

   

Nice to Have

• Deep hands-on experience with or advanced knowledge of Nest.js
• Strong understanding of event-driven architecture and asynchronous communication patterns
• Experience with Web3 tooling such as ethers.js or web3.js for blockchain interactions

Our Customer:

Our client is a forward-thinking early-stage startup creating next-generation GPU efficiency solutions and developing performance layers for AI and LLM workloads.

Your tasks:

• Design and enhance GPU software infrastructure.
• Work with CUDA, OpenCL, ROCm, and LLVM to boost computational performance.
  Drive code compilation and transformation workflows from CPU to GPU.
• Develop scalable high-performance computing and AI infrastructure layers.
  Collaborate with top-tier engineers across GPU, AI, and compiler domains.

Required Experience and Skills:

• 5+ years of hands-on experience working with GPU, compiler, or HPC technologies.
• Strong expertise in performance tuning, GPU memory management, and computer architecture.
• Expertise and passion for performance, latency, and optimization.
• Would be a plus:
  Experience with HPC, LLM systems, or AI infrastructure.

Working conditions

• 5-day working week, 8-hour working day;
• Remote work.

We are looking for an experienced SQL Server DBA / Developer to join our client’s team in an outstaffing model. This role is critical for maintaining high availability, performance, and security of production SQL Server environments. The ideal candidate is hands-on, calm under pressure, and deeply understands how SQL Server behaves in real-world, high-load systems.

Details

Engagement Type: Long-term cooperation

Workload: Full-time

Location: Remote

Start Date: ASAP

Language: English

Key Responsibilities

Administer, support, and optimize Microsoft SQL Server production environments

Manage backup and restore strategies, including disaster recovery readiness

Monitor system workload and perform performance tuning

Diagnose and resolve performance bottlenecks, deadlocks, and concurrency issues

Handle production incidents, including root cause analysis and preventive actions

Implement and maintain security controls (logins, roles, permissions, auditing)

Support database deployments, upgrades, and maintenance activities

Work closely with developers and infrastructure teams to ensure system stability

Requirements

Strong, hands-on experience with MS SQL Server

Deep knowledge of:

- Backups & restores

- Workload monitoring and tuning

- Query and index optimization

- Deadlocks and concurrency management

- SQL Server security (logins, roles, auditing)

Proven experience in production support environments

Ability to work effectively under pressure and handle critical incidents

Good spoken and written English

Nice to Have

Experience in high-availability or high-load environments

Automation or scripting for DBA tasks

Prior experience working in an outstaffing or client-facing model

We are a consulting company operating in the finance and cryptocurrency sector. We have an open remote position of Junior Dealer/Risk Monitoring Manager.

Job Details:
 

Location: The candidate must be located in Ukraine, as the company provides work equipment (laptop).

Working Hours: Monday to Friday, 9 hours per day, Weekly Shifts 07:00-16:00, 09:00 – 18:00, 15:00-00:00
Vacation - unpaid.

Main Responsibilities 
•    Daily management and monitoring of the Trading Platforms to ensure their smooth operation 
•    Performing routine monitoring tasks to ascertain system performance
•    Reviewing client accounts upon requests relating to trading activity and/or platform performance and providing resolution for such inquiries 
•    Execution of client orders and assisting clients with inquiries in line with company policy and procedures
•    Responsible for running complex reporting and its analysis as required by company management 
•    Answering tickets in company’s systems.

Main Requirements 
•    Bachelor's degree in mathematics, Economics, Finance or any other relevant field (advantage)
•    Previous work experience in a similar role and especially in dealing room (advantage)
•    Good knowledge of Microsoft Excel (advantage)
•    B2+ English, both oral and written (must)

For more details, we can discuss via phone call or online interview.

YozmaTech isn’t just another tech company – we’re a global team of go-getters, innovators, and A-players helping startups and product companies scale smarter and faster. We build dedicated development teams across 10+ countries, creating strong, long-term partnerships based on trust, transparency, and real impact. Here, every idea counts. We value people who are proactive, open-minded, and ready to grow. If you’re passionate about building meaningful products and want to join a team that feels like family – you’ll feel right at home with us.

Our client is an early-stage US health & longevity startup building an iOS-first medical platform for clinicians and clinics. The product focuses on creating a holistic, data-driven view of patient health by integrating Apple HealthKit, wearable devices, and medical sensors, with AI used to turn this data into meaningful clinical insights. The team is small and senior, combining engineering expertise with real medical background. This is a true early-stage environment where engineers have ownership, influence architectural decisions, and work closely with product, AI, and medical experts. The culture is technically strong, open, and pragmatic — focused on building quality solutions while moving fast. We are looking for an iOS Developer to work on core product development, HealthKit integrations, and scalable iOS architecture. This role offers real impact, autonomy, and the opportunity to help shape a medical product from the ground up.

Key Requirements:

🔹 5+ years of experience in iOS development, primarily with Swift;
🔹 Strong hands-on experience with SwiftUI;
🔹 Good eye for UI/UX and attention to detail in mobile interfaces;
🔹Solid understanding of iOS architecture patterns (e.g. MVVM) and clean code principles;
🔹 Strong knowledge of memory management and concurrency in iOS;
🔹 Experience with CI/CD pipelines and the App Store release process;
🔹 Experience integrating Apple HealthKit and working with health-related iOS APIs;
🔹 Ability to work with data-heavy mobile applications, including syncing large datasets with backend services;
🔹 Understanding of offline-first mobile architecture and background data processing;
🔹 Familiarity with cloud-based systems (AWS) and backend communication;
🔹 Basic understanding of machine learning / AI concepts and how mobile apps interact with ML-driven systems;
🔹 Experience collaborating with backend services (Python / Node.js) is a strong plus;
🔹 Familiarity with DevOps practices (e.g. CI/CD, infrastructure basics; Terraform is a plus);
🔹 English – Upper-Intermediate or higher.

What you will do:

🔹 Design and develop the core iOS application for a health and longevity medical platform used by clinicians and patients; 🔹 Build and maintain deep integrations with Apple HealthKit, wearable devices, and medical sensors (including smartwatches and glucose monitors);
🔹 Work with complex, data-heavy health datasets, ensuring accurate collection, processing, synchronization, and offline availability;
🔹 Collaborate closely with backend, AI/ML engineers, and medical experts to transform raw health data into meaningful insights and recommendations;
🔹 Take ownership of iOS architecture, performance, and scalability, contributing to technical decisions from early stages;
🔹 Implement and improve offline-first and background data processing scenarios;
🔹 Ensure data security, privacy, and reliability in a regulated medical environment;
🔹 Troubleshoot complex technical issues related to data integrity, performance, and device integrations;
🔹 Actively participate in product discussions, proposing technical solutions and improvements rather than just executing tasks;
🔹 Contribute to testing, stability, and continuous improvement of the mobile application;

Interview stages:

🔹 HR Interview;
🔹 Combined Initial Conversation and Design Interview: A 1-1.5 hour session that combines the initial conversation and design interview;
🔹 Coding Exercise: A coding exercise to evaluate the candidate's coding skills and ability to write clean, efficient code;
🔹 Reference Check;
🔹 Offer.

Freshcode is expanding the team that builds an all-in-one cloud platform for clinics. We are looking for a Clojure Engineer with 4+ years of commercial experience with Clojure and spoken English.
 

Who are we?

At Freshcode, we are passionate about functional programming — especially Clojure. We have more than 10 projects involving 15+ developers from different countries. Our company has a Clojure expertise center where our Clojure developers share their knowledge and experience. Additionally, we continuously sponsor various industry conferences and actively participate in the community, helping it grow and evolve.

Currently, our Clojure team is working on projects in domains such as FinTech, Healthcare, Data Science, and others. Right now, we are actively looking for developers for one of these projects.
 

About the project: A cloud platform for hospitals designed to assess the value of new medical technologies. It combines workflow coordination, project management, financial analysis, and evidence-based clinical decision support in a single solution, as well as a comprehensive product knowledge base.
 

Tech stack: Clojure, ClojureScript, re-frame, Pedestal, Integrant, Malli, Datomic, Redis, Elasticsearch, Keycloak, LaunchDarkly, AWS (S3, SQS, SSM, Textract).
 

Team: 40+ developers, QA Engineer, Team Lead.
 

Responsibilities:

– Full-stack development: design, implementation, and testing of features

– Maintaining and improving existing functionality: bug fixing and performance optimization

– Determining operational feasibility by evaluating analysis, problem definition, requirements, solution development, and proposed solutions

– Communication with the Team Lead and the team
 

We find important:

– 4+ years of commercial experience with Clojure

– Experience with ClojureScript

– Experience with AWS

– Upper-Intermediate or higher level of English
 

Would be a plus:

– Experience with Datomic

– Experience using the Pedestal web framework

– Experience with Babashka
 

We offer:

– Remote work

– Flexible working hours: you can start your working day between 9:00 and 12:00

– No time trackers

– Paid vacation (15 working days) and sick leave (10 working days)

– Internal Clojure Community
 

Interview stages:

1. Interview with the company Recruiter and English proficiency check (up to 60 min)
2. Technical interview with a Senior Clojure Developer (90–120 min)
3. Technical interview with the Client (up to 90 min)

We are looking for a passionate User Acquisition Manager (Meta Ads, Web2Web) to join us and make our products greater!

What to do:

• Design, launch, optimize and analyze Facebook Ads campaigns (both creative testing and scale campaigns);
• Design & implement ad automation via internal tools or Bir.ch (ex-RevealBot);
• Test alternative paid channels with self-service Ad Cabinets;
• Help product marketing team with Web Funnels ideation and reporting;
• Help creative production team with Creative testing approach ideation and reporting;

What will help to achieve success:

• Strong proven track record for managing big ad spends on Tier-1 market;
• Ad automation experience;
• Web Funnels experience;
• B2C subscription app experience;
• Proficiency in English — B2 or higher level;