Jobs at Djinni

We power people’s progress.

At Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it’s creating real impact.

We’ve just reached unicorn status with a $150M Series D, accelerating our vision to transform education through human-led, AI-enhanced learning. Today, 100,000+ tutors teach 90+ languages to learners in 180 countries - and we’re only getting started. As a category-defining company, we’re shaping what the future of learning looks like at global scale.

Every Preply lesson sparks change, fuels ambition, and drives progress that matters. Joining Preply means helping define the future of education at global scale, and building something that truly matters for millions of people, every day.

Meet the team!

We’re on a mission to transform lives through learning. In our Learning Teams, that means building the next generation of personalized, AI-enabled, media-rich experiences for learners and tutors around the world. If you care deeply about impact, quality, technology and culture – this is your chance to lead a part of it.

As a Staff Engineer in the Learning Teams, you will lead some of the most complex and strategic engineering initiatives at Preply. You will define and drive technical roadmaps and architecture, collaborate across product, engineering and business stakeholders, and influence our platform at scale. This is a senior individual contributor role with broad scope and strong impact – you will help shape how we build, ship and evolve our learning experiences globally.

What you’ll be doing

• Shape, drive, and co-own the Learning Teams’s engineering strategy and own technical roadmap, partnering with Engineering and Product Leadership s to align initiatives, priorities and dependencies.
• Lead end-to-end strategic initiatives and innovations, translating high-level product vision into technical execution, align scope and milestones and ship iteratively with measurable outcomes.
• Evolve architecture and core services into a scalable, reliable platform, defining target states, drive deprecations and migrations, and uphold technical excellence (availability, performance, cost).
• Raise engineering practices and developer experience, driving RFCs, post-mortems, quality frameworks (evaluations, instrumentation), identifying bottlenecks and driving initiatives that reduce toil and increase productivity across team
• Operate as a multiplier: mentor and influence senior engineers, Tech Leads, EMs, and hiring panels; stay hands-on for the hardest, most impactful work.
• Make build-vs-buy and vendor/tooling calls with a clear view of total cost of ownership; lead evaluations and participate in negotiations.

What you'll bring

• Strong foundation in software engineering and architecture; comfortable designing and evolving large-scale systems and deriving technical strategy from business objectives.
• Proficiency across the full stack, from frontend frameworks and mobile clients to backend systems, APIs, and data flows, with a focus on cohesive end-to-end experiences.
• Hands-on technical expertise, comfortable diving deep into code, building proofs-of-concept, and iterating quickly with teams to validate technical approaches.
• Excellent communication and leadership skills, able to articulate technical vision, trade-offs, and business value to both engineering, product and executive stakeholders. Able to influence without formal authority.
• Proven track record of taking ownership end-to-end, from defining scope, through delivery, launch, and operational stability.
• Analytical and creative problem-solving skills, able to explore multiple implementation paths, evaluate trade-offs, and make pragmatic decisions under uncertainty.
• Ability to operate across domains, new feature development, architecture evolution, system migrations, process improvement – all matters.
• Proven experience driving engineering culture, mentoring senior engineers, influencing tech leads, leading hiring for key roles, establishing and evangelising RFCs, post-mortems, etc.

• Experience or strong interest in one or more of these domains: AI/ML, media/video platforms, large-scale system migrations, cost optimisation, data infrastructure, QA/test-automation at scale.

   

Why you’ll love it at Preply:

• An open, collaborative, dynamic, and diverse culture;
• A generous monthly allowance for lessons on Preply.com, Learning & Development budget, and time off for your self-development;
• A competitive financial package with equity, leave allowance, and health insurance;
• Access to free mental health support platforms;
• The opportunity to unlock the potential of learners and tutors through language learning and teaching in 175 countries (and counting!)

Trinity Affiliate Network is a fast-growing Dating affiliate network working with Tier-1 and Tier-2 GEOs.
We help affiliates and media buying teams scale results through high-quality offers, stable payouts, and hands-on support.

We are looking for an Affiliate Manager who can build long-term partner relationships, work confidently with numbers, and understands the specifics of CPA Dating.

Responsibilities

• Attract and onboard new affiliates and media buying teams
• Manage and grow existing partners: daily support, consulting, offer upsell
• Negotiate rates, CPA / CPL models, bonuses, and special conditions
• Monitor traffic quality: CR, retention, fraud analysis
• Optimize partner performance and select the most effective offers
• Maintain regular communication with partners (Telegram / Skype / Email)
• Keep reporting in CRM systems and Google Sheets
• Run A/B tests, analyze traffic sources and conversions
• Monitor competitors and market trends

Requirements

• 1+ year of experience as an Affiliate Manager in CPA Dating
• Solid understanding of CPA and CPL models
• Knowledge of key metrics: Click2Reg, Reg2Dep, CR, ROI, LTV, eCPA
• Confident communication with affiliates (Telegram / Skype)
• Strong negotiation skills and ability to close deals
• Basic analytical skills (Google Sheets, tracking platforms)
• English level B1 or higher

Nice to Have

• Experience working with Tier-1 GEOs
• Understanding of traffic sources (Facebook, Google, Native, Push, In-App)
• Experience scaling affiliate partners

We Offer

• Work in a fast-growing Dating / CPA niche
• Strong offers and transparent conditions
• A team that provides real support, not just “ticket-based” assistance
• Direct impact on results and growth opportunities within the network

We are looking for a Growth Marketing Specialist who is curious, analytical, and eager to experiment.
This role is less about following ready-made templates and more about testing ideas, learning fast, and improving results step by step.

For a perfect match, we expect 🎯

• 2+ years of experience in marketing, lead generation, or growth-related roles
• Strong interest in experimentation, hypothesis testing, and analytics
• Understanding of lead generation mechanics (channels, funnels, ICPs)
• Ability to learn and quickly adapt to new tools and approaches
• Experience working closely with Sales or Business Development teams
• Structured and logical thinking
• English level: Intermediate+

⚠️ Hands-on experience with Email or LinkedIn outreach is a plus, but not a strict requirement.
We care more about mindset than specific tools.

Nice to have 💎

• Experience in B2B or IT services marketing
• Familiarity with automation or lead generation tools (Gigradar, Apollo, similar)
• Experience running small experiments or growth tests
• Basic understanding of CRM systems or pipelines

• Interest in building or improving marketing processes

   

Duties & Responsibilities 💼

• Testing and validating new lead generation ideas and channels
• Creating hypotheses and running small experiments across niches
• Supporting Sales team with lead research and campaign preparation
• Analyzing results and improving campaign performance
• Participating in building and optimizing lead generation workflows
• Documenting learnings and insights from experiments

Why Join Admiral Studios?

⭐️Growth-Oriented Environment – value efficiency, flexibility, and results

🤝Team Spirit – Regular corporate online & offline events to keep the team connected
📚Professional Development Support – we provide:

• A structured Performance Review system
• Access to an internal knowledge library
• Career growth opportunities with a clear development plan
• A budget for improving work processes and implementing new ideas

🧘Work-Life Balance – Enjoy a flexible work schedule and a fully remote work model
✅Paid Time Off – 20 vacation days + 10 sick leave days per year

Hiring steps: Screening — Tech Interview — СТО Interview — Job Offer 

If your experience and skills match our candidate scorecard, the recruiting team will contact you within 5 business days 💙

Don't forget to provide your Telegram nickname for contact

Marketing Experimentation Specialist / Lead Gen Analyst

We’re searching for a Marketing Experimentation Specialist — someone who enjoys digging into data, testing assumptions, and learning what really works.

This role is ideal for a marketer who prefers thinking and testing over routine execution.

For a perfect match, we expect 🎯

• 2–3 years of experience in marketing, analytics, or lead generation
• Strong analytical mindset and curiosity
• Experience working with hypotheses, tests, or experiments
• Ability to independently research, test, and draw conclusions
• Understanding of B2B marketing or client acquisition basics
• Comfortable working with incomplete data and iterating
• English level: Intermediate+

Outreach tools (Email / LinkedIn) are optional — we’ll teach tools,
but we can’t teach curiosity and critical thinking.

Nice to have 💎

• Experience with A/B testing or funnel analysis
• Familiarity with marketing metrics and KPIs
• Experience working with Sales or client-facing teams
• Interest in automation and marketing tooling
• Background in IT, SaaS, or outsourcing is a plus

Duties & Responsibilities 💼

• Designing and running marketing experiments
• Testing different niches, ICPs, and acquisition approaches
• Analyzing campaign results and identifying patterns
• Supporting Sales team with insights and validated ideas
• Improving existing lead generation workflows
• Suggesting new tools, approaches, and optimizations

Why Join Admiral Studios?

⭐️Growth-Oriented Environment – value efficiency, flexibility, and results

🤝Team Spirit – Regular corporate online & offline events to keep the team connected
📚Professional Development Support – we provide:

• A structured Performance Review system
• Access to an internal knowledge library
• Career growth opportunities with a clear development plan
• A budget for improving work processes and implementing new ideas

🧘Work-Life Balance – Enjoy a flexible work schedule and a fully remote work model
✅Paid Time Off – 20 vacation days + 10 sick leave days per year

Hiring steps: Screening — Tech Interview — СТО Interview — Job Offer 

If your experience and skills match our candidate scorecard, the recruiting team will contact you within 5 business days 💙

Don't forget to provide your Telegram nickname for contact

Admiral Studios is a fast-growing Ukrainian IT outsourcing company, specializing in web development, mobile development, UI/UX, and SEO.

We embrace the latest and most advanced technologies: Node.js, React, Laravel, Shopify, Python, and WordPress.

We create quality projects for clients in the US, Europe, the UK, and Canada 🌍, especially Healthcare, Real Estate, and E-commerce projects.

Currently, our team consists of more than 60+ skilled experts 👨‍💻, and we are constantly growing.

Now, we’re looking for an IT Sales Manager ⭐️ to help us expand our client base and drive growth. If you have a sales background, a proactive mindset, and a passion for building long-term partnerships, this is your opportunity.
As a part of our growth & business development team, you’ll be supported in your desire for new challenges and professional growth.

For a perfect match, we expect 🎯

• 3+ years of experience in IT outsourcing / consulting sales with a proven track record in full-cycle B2B deals
• Hands-on experience with full-cycle sales using Upwork and LinkedIn
• Strong understanding of web technologies such as Node.js, React, WordPress, and Laravel
• Deep knowledge of IT services, outsourcing models, and current industry trends
• Excellent communication, negotiation, and stakeholder management skills
• Advanced objection-handling and closing expertise
• Confident use of CRM tools to manage pipelines, forecasts, and deal progress

Nice to have 💎

• Experience selling to enterprise clients or high-value B2B accounts
• Knowledge of contract negotiation and deal structuring
• Experience selling E-commerce / Shopify solutions and SEO services
• Background in consultative or solution-based sales

Duties & Responsibilities 💼

• Identify, qualify, and close high-value B2B opportunities in IT outsourcing and consulting
• Conduct full-cycle sales via Upwork, LinkedIn, and direct outreach: from prospecting and discovery to contract signing
• Own and manage the sales pipeline and revenue forecast
• Lead discovery calls and solution-mapping sessions, translating business needs into technical solutions in collaboration with delivery teams
• Negotiate pricing, contracts, and scopes of work, ensuring commercially sound deal structures
• Ensure smooth handover from sales to delivery and support early-stage client engagement
• Proactively build, test, and optimize sales processes (outreach, qualification, follow-ups, CRM workflows)
• Track, analyze, and optimize sales performance metrics to drive continuous improvement
• Handle complex objections and stalled deals using strategic and creative closing approaches
• Analyze market trends, competitors, and client needs to identify new opportunities and niches
• Collaborate closely with Marketing, Delivery, and Management to align sales strategy with company goals
• Share best practices and contribute to scaling and maturity of the sales function

Why Join Admiral Studios?

⭐️Growth-Oriented Environment – value efficiency, flexibility, and results. 

🤝Team Spirit – Regular corporate online & offline events to keep the team connected
📚Professional Development Support – we provide:

• A structured Performance Review system.
• Access to an internal knowledge library.
• Career growth opportunities with a clear development plan.
• A budget for improving work processes and implementing new ideas.

🧘Work-Life Balance – Enjoy a flexible work schedule and a fully remote work model.
✅Paid Time Off – 20 vacation days + 10 sick leave days per year.

Hiring steps: 
Screening — Test Task — Tech Interview — CEO Interview — Job Offer 

If your experience and skills match our candidate scorecard, the recruiting team will contact you within 5 business days 💙

Don't forget to provide your Telegram nickname for contact.

Responsibilities
 

Develop and maintain web applications using React.js (Frontend) and Node.js (Backend).
Work with RESTful APIs and databases (MongoDB, PostgreSQL).
Write clean, efficient, and maintainable code.
Collaborate with designers, backend developers, and product managers to deliver high-quality solutions.
Participate in code reviews and continuously improve development processes.
Debug and fix issues in existing applications.
 

Requirements
 

Basic knowledge of JavaScript/TypeScript, HTML, and CSS.
Experience with React.js and Node.js (academic, personal, or internship projects).
Understanding of REST API principles and client-server architecture.
Familiarity with database management (MongoDB, PostgreSQL or similar).
Experience with Git and version control workflows.
Strong problem-solving skills and a willingness to learn.
English level: B1 or higher
 

Nice to Have

Experience with Redux, Next.js, Express.js, Nest.js.
Basic understanding of Docker, CI/CD pipelines.
Knowledge of testing frameworks (Jest, Cypress).
Familiarity with cloud services (AWS, Firebase).
 

What We Offer

Interesting and challenging projects.
Vast opportunities for professional development.
Competitive salary.
The friendly team of professionals.
Comfortable working environment.

Description

A program of projects within the Energy domain. We will work on various applications covering generation control, distribution control, transmission control, and service crews control. The implementation area of these products is very high-scale (e.g. country-wide systems).

Job Description

• 5+ years of experience as .Net developer. At least 2 years as a Lead developer
• Ability to lead a team of 4-6 engineers
• Proven experience in working with teams/solution architects/ POs from the client-side
• Goog grasp of the application architecture.
• Proven experience with Azure, Azure DevOps
• Proven experience with both desktop and cloud-based applications
• OOP Development, Design Patterns, Best Practices
• Good English to work with clients directly

Job Responsibilities

• Strong problem-solving and follow-up skills; must be proactive and take initiative
• Professionalism and the ability to maintain the highest level of confidentiality
• Create robust solutions and translate project requirements into application architecture decisions
• Lead the development process using development and security best practices
• Leverage technologies to support business needs to attain high reusability and maintainability of current and newly developed solutions
• Provide system design recommendations based on technical requirements
• Work independently on the tasks and ensure the team's supervision
• Ensure high-quality software delivery and code quality by utilizing tools such as SonarCloud or Black Duck.  
• Leads a team of engineers and AQAs to work on the team backlog, support Scrum Master and PO

We are toogeza, a Ukrainian recruiting company that is focused on hiring talents and building teams for tech startups worldwide.

Currently, we are looking for a Product Manager for The Kyiv Independent.

The Kyiv Independent is Ukraine’s main English-language news outlet. It was founded in November 2021 by a team of reporters and editors who were fired from the Kyiv Post for defending editorial independence, in partnership with a media consultancy company Jnomics. Today, it’s a team of around 80 people based mostly in Kyiv. Publishing in English, we serve as Ukraine’s voice in the world and the world’s window into Ukraine.

 

What We’re Looking For

• 3+ years of experience working as a Product Manager / Data Analyst / other relevant product & tech experience
• Strong organizational skills, with the ability to multitask and manage multiple projects simultaneously
• Experience in setting up, running, and analysing A/B testing campaigns;
• Experience using analytics tools such as Google Analytics 4, MS Clarity, Chartbeat, etc., would be considered a plus
• Practical knowledge of using Jira or similar tools would be considered a plus
• Proficiency in English: Upper-Intermediate / Advanced level
• Alignment with the values and mission of the Kyiv Independent

What You’ll Do

• Work closely with the development team at the Kyiv Independent on implementing continuous improvements of the Kyiv Independent users’ experience, and product roadmap
• Work under the supervision of the Senior Product Manager at the Kyiv Independent, assisting the manager in ongoing product development
• Work with the editorial, marketing, e-commerce, B2B, and other teams to align product efforts with broader company goals
• Maintain product documentation, including user research reports, product requests backlog, A/B test reports, etc.
• Analyze user needs and behavior to support current priorities and future development plans, prioritizing features and development accordingly
• Take part in ideation, design, and analysis of A/B tests, and help generate additional hypotheses based on the test results

We Offer

• Market-level compensation
• The opportunity to work with a young, highly motivated team at an award-winning media company
• Flexible work schedule
• Opportunities for career growth based on performance
• The ability to work remotely upon agreement
• The chance to work with a passionate global community dedicated to supporting independent journalism.

If this role sounds like a fit — we’d love to hear from you! Just send over your CV and anything else you’d like us to consider.

We’ll review everything within five working days, and if your background matches what we’re looking for, we’ll get in touch to set up a call and get to know each other better.

We’re looking for a motivated  Manual QA Engineer to join our friendly, fast-paced team. This is a great opportunity for someone with some commercial experience who is ready to expand their skills alongside seasoned QA professionals.

What We’re Looking For (Required Skills):

• At least 4 months of commercial experience as a manual QA engineer.
• Strong technical curiosity and analytical mindset.
• Intermediate or higher English (spoken and written).
• Hands-on experience with test design and documentation (test cases, test suites) from commercial projects.
• Solid understanding of manual testing theory and practice.

Nice-to-Have Skills:

• Familiarity with SQL.
• Basic understanding of client-server architecture.
• Introductory knowledge of any programming language.

Recruiting process:

• Pre-Screening Interview with a recruiter (30 min).
• Technical Interview (up to 1 hour).

What We Offer:

• A dedicated mentor during probation for a smooth onboarding.
• Supportive team of experienced QA engineers and developers.
• Real opportunities for career growth.
• Exposure to diverse projects and software development processes.
• Free English classes.
• Paid vacation and sick leave.
• Comprehensive medical insurance.
• Flexible remote work.

We are looking for a Graphic Designer  who can work with brands end-to-end, take ownership of visual decisions, and understand how design supports marketing and communication goals.

Responsibilities

• Create visuals for social media (posts, stories, ads)
• Edit short-form video content (Reels, Shorts, Stories)
• Design exhibition and conference booth layouts
• Develop merchandise branding (clothing, accessories, promo items)
• Create printed materials (greeting cards, partner materials)
• Work with brand guidelines and develop visual identity
• Prepare materials for digital and print
• Collaborate with the marketing team on visual solutions

Requirements

• 3+ years of experience as a Graphic Designer (Senior or strong Middle level)
• Strong portfolio (digital, branding, event projects)
• Confident use of Figma, Adobe Photoshop, Illustrator
• Video editing skills (After Effects / Premiere Pro / DaVinci Resolve or similar)
• Strong understanding of composition, typography, and color
• Ability to work independently and take responsibility for results
• Experience working with multiple tasks and deadlines

Nice to Have

• Experience with event design and exhibition stands
• Experience creating branded merchandise
• Understanding of marketing, SMM, and ad formats
• iGaming industry experience

We power people’s progress.

At Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it’s creating real impact.

We’ve just reached unicorn status with a $150M Series D, accelerating our vision to transform education through human-led, AI-enhanced learning. Today, 100,000+ tutors teach 90+ languages to learners in 180 countries - and we’re only getting started. As a category-defining company, we’re shaping what the future of learning looks like at global scale.

Every Preply lesson sparks change, fuels ambition, and drives progress that matters. Joining Preply means helping define the future of education at global scale, and building something that truly matters for millions of people, every day.

What you’ll be doing:

• Develop high-quality, scalable, and reliable features for Preply mobile applications using React Native and launched in our A/B experimentation framework.
• Collaborate with cross-functional teams, including UX designers, product managers, and other engineers, to deliver innovative solutions that empower our learners and educators.
• Share your knowledge and expertise with the team and continuously learn from others to foster a culture of continuous learning and growth.
• Write clean, maintainable, and efficient code that sets the standard for excellence, contributing to the overall performance and code quality
• Participate in code reviews and ensure code quality to maintain our high standards.
• Continuously improve software engineering practices and methodologies to stay ahead of the curve and deliver value to our users.

What you need to succeed

• 5+ years in mobile development with React Native.
• Proficiency in JavaScript/Typescript and experience with popular React Native libraries (e.g. Reanimated, Apollo Client, Expo, React Navigation).
• Commitment to excellence and problem-solving skills to debug complex issues.
• Great communication skills and ability to collaborate with cross-functional teams to deliver results.
• Experience with agile software development methodologies to help us move fast and deliver value.
• Experience writing unit and e2e tests

Why you’ll love it at Preply

• An open, collaborative, dynamic and diverse culture;
• A generous monthly allowance for lessons on Preply.com, Learning & Development budget and time off for your self-development;
• A competitive financial package with equity, leave allowance and health insurance;
• Access to free mental health support platforms;
• The opportunity to unlock the potential of learners and tutors through language learning and teaching in 175 countries (and counting!)

We power people’s progress.

At Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it’s creating real impact.

We’ve just reached unicorn status with a $150M Series D, accelerating our vision to transform education through human-led, AI-enhanced learning. Today, 100,000+ tutors teach 90+ languages to learners in 180 countries - and we’re only getting started. As a category-defining company, we’re shaping what the future of learning looks like at global scale.

Every Preply lesson sparks change, fuels ambition, and drives progress that matters. Joining Preply means helping define the future of education at global scale, and building something that truly matters for millions of people, every day.

We power people's progress.

At Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalized learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it’s creating real impact. So far, 90,000 tutors have delivered over 20 million lessons to learners in more than 175 countries. Every Preply lesson sparks change, fuels ambition, and drives progress that matters.
 

Meet the team!

Join Preply’s Teams and help us power people’s progress through life-changing learning experiences. We’re on a mission to combine the magic of the best tutors with cutting-edge AI to create personalized journeys that keep learners motivated and inspired. The Preply Engineering Team provides the tools to help unlock human potential through learning.

Our team builds scalable, resilient applications using the powerful combination of Python/Django on the backend and ReactJS on the frontend — all to deliver an exceptional, seamless experience to our users.

We’re proudly tech-agnostic, meaning we’re open to candidates with a variety of technical backgrounds, whether that’s Java/Spring, Node.js/Express, Ruby on Rails, Scala/Play, PHP, or Golang.

While Python is our main language, prior experience with it isn’t required. What matters most is your willingness to learn, your ability to adapt quickly, and your enthusiasm for using Python in product-focused development.

We implement A/B tests to prove the value of our initiatives and improve our product based on data and students' and tutors' feedback. As part of our commitment to ensuring high-quality products, we prioritize monitoring and metrics analysis to identify areas for optimization and ensure our services are performing at their best. 

At Preply, we release our product 50-60 times per day by leveraging top-notch CI/CD processes. As a fast-growing company we have diverse technical challenges (sometimes we even write about them on our Engineering Blog) that will allow you to develop your skills at scale. 

What you’ll be doing:

You will work in a cross-functional team alongside the Product Manager, Product Designer, UX Writers, Data Analytics, Technical Leads, Engineers and other cross-functional team members to deliver engaging features through A/B tests and build top-notch products, including, but not limited to:

• Develop and own backend features using Python/Django, supporting the creation of new backend services as well as design, create, and/or troubleshoot integrations with third-party vendors.
• Think beyond the code and about our customers, understand their needs, and define solutions with the team;
• Balance short-term speed of development with the long-term technical quality of our systems;
• As a Senior Engineer, you will leverage your experience to guide the team in making informed technical decisions, such as continuous improvement of best practices (test culture, code reviews, monitoring and scalability of our tools). 

What you need to succeed:

• Exposure to architectural patterns of a large, high-scale web application (e.g., well-designed APIs, high-volume data pipelines, efficient algorithms);
• Familiar and willing to support small JS/TS tasks when needed;
• Expertise in troubleshooting issues, identifying the root cause, mitigating it, and setting up safeguards to prevent future issues;
• High level of self-organization, ownership, and responsibility;
• A great collaborator with excellent verbal and written communication skills. Minimum B2 English level;
• Willingness to be on-call for your squad (1 week every 5 weeks).

Why you’ll love it at Preply: 

• An open, collaborative, dynamic, and diverse culture;
• A generous monthly allowance for lessons on Preply.com, Learning & Development budget, and time off for your self-development;
• A competitive financial package with equity, leave allowance, and health insurance;
• Access to free mental health support platforms;
• The opportunity to unlock the potential of learners and tutors through language learning and teaching in 175 countries (and counting!)

We are looking for a specialist to design and implement an end-to-end performance testing framework for a healthcare system running on Databricks and Microsoft Azure. You will build a repeatable, automated approach to measure and improve performance across data ingestion, ETL/ELT pipelines, Spark workloads, serving layers, APIs, security/identity flows, integration components, and presentation/UI, while meeting healthcare-grade security and compliance expectations.

This role sits at the intersection of performance engineering, cloud architecture, and test automation, with strong attention to regulated-domain requirements (privacy, auditability, access controls).

Key Responsibilities

• Design and build a performance testing strategy and framework for a Databricks + Azure healthcare platform.
• Define performance KPIs/SLOs (e.g., pipeline latency, throughput, job duration, cluster utilization, cost per run, data freshness).
• Create workload models that reflect production usage (batch, streaming, peak loads, concurrency, backfills).
• Create a test taxonomy: smoke perf, baseline benchmarks, load, stress, soak/endurance, spike tests, and capacity planning.
  
   
• Implement automated performance test suites for:
  • Databricks jobs/workflows (Workflows, Jobs API)
  • Spark/Delta Lake operations (reads/writes, mergers, compaction, Z-Ordering where relevant)
  • Data ingestion (ADF, Event Hubs, ADLS Gen2, Autoloader, etc. as applicable)
• Build test data generation and data anonymization/synthetic data approaches suitable for healthcare contexts.
• Instrument, collect, and analyze metrics from:
  • Spark UI / event logs
  • Databricks metrics and system tables
  • Azure Monitor / Log Analytics
  • Application logs and telemetry (if applicable)
• Produce actionable performance reports and dashboards (trend, regression detection, run-to-run comparability).
• Create performance tests for key user journeys (page load, search, dashboards) using appropriate tooling.
• Measure client-side and network timings and correlate them with API/backend performance.
• Integrate performance tests into CI/CD (Azure DevOps or GitHub Actions), including gating rules and baselines.
• Document framework usage, standards, and provide enablement to engineering teams.

Required Qualifications

• Proven experience building performance testing frameworks (not just executing tests), ideally for data platforms.
• Strong hands-on expertise with Databricks and Apache Spark performance tuning and troubleshooting.
• Strong knowledge of Azure services used in data platforms (commonly ADLS Gen2, ADF, Key Vault, Azure Monitor/Log Analytics; others as relevant).
• Strong programming/scripting ability in Python and/or Java/TypeScript.
• Familiarity with load/performance tools and approaches (e.g., custom harnesses, Locust/JMeter/k6 where appropriate, or Spark-specific benchmarking).
• Ability to design repeatable benchmarking (baseline creation, environment parity, noise reduction, statistical comparison).
• Understanding of data security and compliance needs typical for healthcare (e.g., HIPAA-like controls, access management, auditability; adapt to your jurisdiction).
• High-level proficiency in English

Nice-to-Have / Preferred

• Experience with Delta Lake optimization (OPTIMIZE, ZORDER, liquid clustering where applicable), streaming performance, and structured streaming.
• Experience with Terraform/IaC for reproducible test environments.
• Knowledge of Unity Catalog, data governance, and fine-grained access controls.
• Experience with OpenTelemetry tracing and correlation across UI → API → data workloads.
• FinOps mindset: performance improvements tied to cost efficiency on Databricks/Azure.
• Prior work on regulated domains (healthcare, pharma, insurance).

 Working Model

• Contract
• Remote
• Collaboration with Data Engineering, Platform Engineering, Security/Compliance, and Product teams.

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 Lead React Native Engineer!

Requirements:

— 4+ years of experience with React Native.
— Deep understanding of mobile application architecture and cross-platform development.
— Ability to solve tasks independently and make responsible technical decisions.
— Proactive approach to exploring new technologies and continuously improving the product.
— Experience with blockchain, smart contracts, or dApps.
— Experience leading a frontend team, including technical ownership, mentoring engineers, reviewing architecture decisions, and aligning frontend development with business and product goals is a strong plus.

Responsibilities:

— Lead the frontend team, providing technical direction, mentorship, and regular feedback.
— Develop, maintain, and optimize mobile applications using React Native.
— Participate in architectural discussions and ensure scalability and maintainability of the codebase.
— Ensure high code quality, performance, and user experience across platforms.
— Collaborate closely with backend, frontend, design, and product teams to deliver cohesive features.
— Conduct code reviews and contribute to continuous improvement of development practices.
— Stay up to date with industry trends and integrate relevant technologies into the product.
— Contribute to integrating blockchain features and Web3 capabilities where applicable

Immerse yourself in Crypto & Web3:

— Shape the Future — Work on high-impact blockchain products at the forefront of Web3.
— Innovate & Create — Your ideas drive real-world solutions and technological breakthroughs.
— Global Reach — Build scalable solutions for businesses and users worldwide.
— Web3-Powered Culture — A team of visionaries who believe in decentralization and innovation.
Work-Life Balance & Well-being:
— Modern equipment.
— Comfortable working conditions, and an inspiring environment to help you thrive.
— 24 calendar days of paid leave.
— Additional days off for national holidays.


Ready to disrupt the industry with us? Apply now and let’s build the decentralized future together!

We are looking for a skilled Senior С++ Engineer. 

Responsibilities:

• Design, develop, and maintain C++ applications and services that interact with embedded systems. 
• Collaborate with other engineers to integrate C++-based software with embedded systems and sensors, enabling seamless data exchange and device control.
• Identify, troubleshoot, and resolve software-hardware integration issues, ensuring high-quality, reliable, and performant solutions.

Requirements:

• 4+ years of experience in software development (preferably in software-hardware)
• Solid understanding of embedded systems, microcontrollers, and hardware-software interaction.
• Strong expertise in C++, with experience in performance optimization, multithreading, and I/O operations in resource-constrained environments.
• Experience with serial communication protocols (e.g., UART, SPI, I2C).
• Experience in Linux/Unix environments and tools (e.g., Git, SSH, command-line utilities).
• Experience with single board PCs (e.g., Raspberry Pi, Arduino, etc.).
• Experince with MAVLink protocol. 

Will be a plus:

• Knowledge of cloud technologies or IoT platforms (e.g., MQTT, AWS IoT, Google Cloud IoT). 
• Experience using Sine.Link and Starlink tech for development. 
• Experience with Python for development, including scripting, testing, and automation, as well as its use in embedded systems.
• Understanding of drones firmware. 
  
   We provide reservations from mobilization