Jobs at Djinni

Company Description

Are you ready to take ownership of mission-critical backend systems in a high-load, transaction-heavy environment? We are looking for a Senior Java Developer to join our Payments Domain team in Warsaw.

This is a hybrid role with 3 days per week in the office, giving you the perfect balance between collaboration and flexibility. At Sigma Software, we value engineering excellence, multicultural teamwork, and delivering secure, high-performance solutions.

Why join us? You’ll work on a platform processing millions of transactions daily, contribute to architectural decisions, and be part of a company where innovation and ownership are encouraged.

CUSTOMER

Our customer is a well-established international company in the iGaming industry, known for its engineering-driven culture and multicultural team distributed across multiple countries. Operating multiple brands across various markets, the company delivers secure, high-performance digital platforms recognized for reliability and scalability.

PROJECT

You will be part of the Payments Domain team, responsible for developing and maintaining a large-scale payments platform built on modern microservices architecture. The platform processes millions of secure transactions daily, supporting multiple brands and geographies. The work focuses on scalability, reliability, and performance in a high-load environment, covering everything from integration with payment providers to transaction monitoring and compliance.

Job Description

• Design, develop, and maintain backend services for the payments platform using Java and Spring Boot
• Ensure high availability, scalability, and performance of transaction processing systems
• Collaborate with cross-functional teams to define technical requirements and deliver solutions end-to-end
• Implement integrations with payment service providers and internal systems
• Participate in architectural discussions and contribute to system evolution in a microservices environment
• Monitor, troubleshoot, and optimize services in production
• Ensure compliance with security, regulatory, and operational standards
• Drive continuous improvement in code quality, testing, and deployment practices
• 3 days per week working from the office

Qualifications

• 5+ years of commercial experience with Java and Spring Boot
• Strong experience with MySQL and Kafka
• Proven track record working with microservices architecture in high-traffic, high-load systems
• Experience developing high-performance backend solutions for transaction-heavy platforms
• Ownership mindset with ability to deliver services end-to-end
• Excellent communication skills in English (C1 level), both written and verbal
• Experience with Kotlin

PwC is a global network of more than 370,000 professionals in 149 countries that turns challenges into opportunities. We create innovative solutions in audit, consulting, tax and technology, combining knowledge from all over the world.

We are seeking an AI Architect to design, build, and guide the secure and scalable adoption of AI platforms and AI‑driven applications. This role partners with engineering, data science, and product teams to define AI solution architectures, ensure technical excellence, and embed best practices throughout the AI lifecycle—from data ingestion and model development to deployment and monitoring.

Key Responsibilities:

AI Architecture & Design

• Architect scalable AI/ML and LLM‑based solutions, including data flows, integration patterns, and deployment approaches.
• Conduct architectural reviews for new AI features and system changes.
• Define reference architectures and reusable AI patterns.

Collaboration With Engineering & Product Teams

• Partner with engineering, MLOps, and product teams to translate needs into AI solutions.
• Provide technical guidance that balances performance, cost, and speed.
• Build repeatable processes for reviewing AI capabilities and changes.

MLOps & Deployment

• Support integration of AI workflows into CI/CD processes.
• Promote automated testing, validation, and monitoring of AI models.
• Collaborate on tooling for model deployment, versioning, and observability.

Governance & Responsible AI

• Ensure AI designs follow internal governance and responsible AI principles.
• Support documentation and transparency for AI system behaviors.
• Align architectures with regulatory and compliance requirements.

Monitoring & Continuous Improvement

• Guide teams on monitoring, anomaly detection, and model performance tracking.
• Identify improvement opportunities and evolve AI architecture standards.
• Share best practices and mentor teams on modern AI technologies.

Required Skills:

• Experience in AI/ML system design, cloud‑native architecture, or application architecture.
• Strong understanding of the AI/ML development lifecycle, including training, deployment, and inference.
• Hands‑on exposure to LLM applications, RAG pipelines, vector databases, and API‑based AI integrations.
• Familiarity with MLOps, DevOps, and modern cloud platforms (Azure, AWS, GCP).
• Strong communication skills and ability to work cross‑functionally.
• Curiosity and passion for emerging AI technologies.

Preferred Qualifications:

• Experience building or securing generative AI applications.
• Knowledge of frameworks like NIST AI RMF, OWASP LLM Top 10, MITRE ATLAS, ISO/IEC 42001.
• Cloud or AI‑related certifications.
• Background in ML engineering or MLOps.

Policy statements:
https://www.pwc.com/ua/uk/about/privacy.html

Backend Engineer (Location-Based Mobile Game / AR)

About the Project
 

We are building a location-based mobile game where users purchase keys to hunt and open real-world chests using their phone camera.

Each chest can be opened only once globally, which makes backend logic, geo-queries, and data integrity critical.

This is an early-stage MVP with clear scope, fast decisions, and direct access to the product owner.

Responsibilities

• Design and implement backend architecture for the MVP
• Build REST APIs for:
   
  • user profiles & authentication
  • keys inventory & balance
  • geo-based chest discovery
  • chest opening (atomic, server-authoritative)
  • town-based statistics & leaderboard
     
• Design PostgreSQL schema with geospatial queries (PostGIS)
• Implement anti-cheat logic:
   
  • distance validation
  • speed / teleport detection
  • race-condition protection (two users opening same chest)
     
• Integrate Apple / Google sign-in
• Support in-app purchase receipt validation (keys)
• Work closely with Unity developer to define clean API contracts
   

Technical Requirements (Must Have)

• 4+ years of backend development experience
• Strong knowledge of PostgreSQL
• Experience designing REST APIs
• Understanding of transactional systems & data consistency
• Experience with Node.js (NestJS) or Go
• Familiarity with authentication flows (OAuth)
• Ability to work independently and make technical decisions
   

Nice to Have

• Experience with PostGIS or geo-based queries
• Experience with mobile games or high-concurrency systems
• Understanding of anti-fraud / anti-cheat patterns
• Experience with cloud deployment (AWS / GCP / similar)

What This Is NOT

• This is not a large corporate project
• No heavy bureaucracy
• No 10-layer approval process
• You will not “just implement tickets” — you will shape the system
   

Engagement Format

• Full-time preferred
• Remote
• Direct communication with founder / product owner

About us:
AIR Media-Tech is the ultimate space for creators. With over 30 advanced tools and expert support, we help creators grow, monetize, and safeguard their content. For over 15 years, we’ve been empowering creators to expand their reach, boost their income, and scale globally with innovative solutions tailored to their needs.

About product: 

MilX — Banking for YouTube Creators

MilX is a global fintech app for monetized YouTube creators, operating across the USA, Turkey, LATAM, EU, and 80+ countries.
We replace traditional AdSense payouts and give creators:

• daily payments
• 10+ payout methods
• crypto withdrawals
• multi-currency transfers
• Active Funds (up to 6 months of future revenue in advance)

We are part of the official YouTube Partner ecosystem (via ScaleLab / AIR).

Who We Are Looking For: 

A Senior SDR whose main strength is manual outreach, personalized communication, and strategic hunting of creators.

Key Responsibilities: 

• Manual Outreach (Primary responsibility — 50–60% of time)
• Research, find, and qualify YouTubers manually across multiple platforms.
• Respond to inbound leads quickly.
• Convert inbound interest into channel connections.
• Conduct intro calls and product demos.
• Track creator revenue potential, niche, risks, and monetization quality.
• Build multi-step outreach flows (but keep messages personal).
• Give feedback to the marketing team on creator insights.

Requirements: 

• 2+ years in sales / SDR / BD roles, ideally outreach-driven.
• Proven experience with manual outreach — not only automation tools.
• Comfort pitching on calls and in DMs.
• Excellent written English (B2 at least) for natural-sounding messages.
• Experience selling to creators, influencers, or digital communities is a huge plus.
• Ability to research creators independently and intelligently.

The Benefits:

• Quality health insurance
• Remote work and flexible schedule
• Financial compensation for language courses
• Corporate events for you and your family
• Online and offline team building
• Vacation leave of 18 work days
• Paid sick leave
• Corporate library, lectures, and webinars
• Opportunity to participate in volunteer and charitable projects
• Gifts for birthdays and special occasions (weddings, Christmas, etc.)

Do you want to be involved in outstanding projects? Send us your resume.

If we feel you could be a good fit, we will contact you soon!

We are looking for a Python Developer to join our team.
The role involves working with high-load systems, contributing to architectural decisions, and building scalable backend services.
 

Responsibilities

- Design, develop, and maintain REST APIs using FastAPI / Flask

- Participate in backend architecture design for high-load systems

- Work with AWS services: Lambda, S3, API Gateway, EventBridge 

- Design databases and optimize complex queries
(PostgreSQL, DynamoDB)

- Data validation using Pydantic, performance optimization

- Implement logging, error handling, and testing

- Participate in code reviews and technical discussions

- Collaborate closely with the team on backend-related decisions
 

Requirements:

- 3+ years of commercial experience with Python

- Strong backend-focused experience

- Python 3.x

- FastAPI / Flask, Pydantic

- Hands-on experience with AWS (Lambda, S3, API Gateway, EventBridge)

- Solid knowledge of PostgreSQL / SQL

- Understanding of REST API principles

- Git, experience working in a team

- Experience working with high-load systems
 

Nice to have

- Docker, CI/CD pipelines

- Terraform

- Redis / caching

- Async Python

- Experience with scalability and backend performance optimization

We are a fast-growing eCommerce company (direct advertiser) operating in the nutra and eCommerce straight-sale (SS) space, focused on Tier-1 markets. Performance marketing is at the core of our growth, and Facebook is our primary acquisition channel.

We are currently looking for a Senior Media Buyer / Team Lead with deep, hands-on experience in Facebook advertising within the nutra vertical. This role is for someone who can own performance end-to-end: personally launching, scaling, and optimizing campaigns, while also leading, mentoring, and building a high-performing media buying team.

This will be the first media buying hire and a foundational role in the company. You will be responsible for setting up the entire media buying department from scratch, including infrastructure, workflows, tracking setup, testing frameworks, and best practices. As the team grows, you will define processes, hire and train new buyers, and establish a scalable performance culture.

You will be accountable for driving profitable growth, setting strategy, improving systems, and ensuring consistent results at scale. This is a key leadership position with direct impact on revenue, structure, and long-term direction of the company.

Key Responsibilities

• Set up and launch Facebook ad campaigns from scratch
• Take full ownership of lowering CPA and building a profitable in-house traffic acquisition system

• Help build, organize, and scale a media buying team of 5–10 people over time

   

  Requirements

• 3+ years of experience in media buying for the nutra vertical, mainly with Facebook Ads
• At least 1 year of experience leading or managing a media buying team
• Practical experience with account setup, scaling campaigns, and working in restricted or competitive ad environments (cloaking)
• Good analytical skills and the ability to work independently and build simple, effective processes
• Proactive mindset with strong ownership of results
• Ability to understand campaign data and make optimization decisions
• English level B2 or higher

Salary: $2,000 + % net profit

**Any applications sent via email or any other approach that isn't through this form will not be considered, in order to respect our personal inboxes.

On behalf of our client, we are looking for a highly skilled Data Analyst with strong Power BI expertise to join their growing team.

In this role, you will take ownership of data pipelines and lead the end-to-end development of automated reporting solutions. You'll design, optimize, and deliver impactful Power BI reports, supported by Python-based ETL processes and SQL database management.

Working closely with Finance and internal stakeholders, you will transform complex data into accurate, actionable, and scalable insights that drive smarter business decisions across multiple functions.

We're seeking someone who is proactive, detail-oriented, and hands-on — a problem solver who enjoys improving reporting processes, building efficient systems, and taking full ownership of Power BI solutions from concept to delivery.

If you're passionate about turning data into clear insights and creating reporting that truly adds value, this could be the perfect next step for you.

Key Responsibilities:

• Own, develop, and maintain Power BI dashboards and reports, ensuring clarity, performance, and business relevance.
• Maintain and enhance Python-based ETL pipelines, extracting data from multiple sources such as Azure SQL, MySQL, Telegram, Monday.com, and others for analysis and reporting.
• Ensure data quality, accuracy, and consistency across the full data flow—from ETL pipelines to Power BI and Excel financial reports.
• Collaborate closely with the Finance team to automate recurring reports and support ad-hoc analysis, improving productivity and decision-making.
• Implement enhancements and new features in Power BI models, DAX calculations, and ETL pipelines as business needs evolve.
• Proactively identify, troubleshoot, and resolve data or reporting issues.
• Work with internal teams to understand requirements and propose data-driven and reporting solutions, contributing to continuous process improvement.

Requirements

• Strong proficiency in  Power BI  , including data modeling, DAX, report optimization, and dashboard design.
• Proficiency in  Python  for ETL pipelines, data extraction, transformation, testing, and automation.
• Solid understanding of  SQL and database management  , preferably  Azure SQL  .
• Experience building  scalable, efficient, and reliable data workflows  .
• Ability to work independently and take ownership of Power BI reporting  , while collaborating effectively with finance and other business teams to support data-driven decisions.

What We Offer:

• Competitive salary and benefits package.
• Opportunities to work on cutting-edge data and IT projects.
• A collaborative and fast-paced working environment.
• Career growth opportunities in data engineering, automation, and IT development.

Our client provides global digital banking underpinned by a distinguished tradition of service, offering to its customers choice and flexibility in managing their business and personal finances, while preserving the personal touch and accessibility. The client aims to be the most respected digital bank in the world, serving corporations and individuals in over 180 countries. The client helps its customers bank, trade, borrow, custody, and invest to create the life and legacy they envision. The client provides traditional banking services as well as unique and exclusive tools to save its customers time and provide them with powerful advantages in their personal and corporate financial affairs.

On behalf of the client we are looking for a Full Stack Developer meeting the minimum required skills profile set forth below necessary to be effective in carrying out the following responsibilities:

- Close collaboration with Business Analyst(s), CTO and other bank staff;

- Development of new features that will help take the bank's platform to a new level of excellence;

- Ensuring smooth API-based integration of the bank's platform with 3rd parties;

- Carrying out ongoing maintenance/bugfixing of the bank's proprietary production systems;

- Participation in improvement of the bank's software development processes;

- Co-ownership of the bank's platform architecture for the purpose of keeping the level of technical debt as low as practicable

Minimum requirements:

- Ability and willingness to work Pacific standard time hours

- Fluency in Ukrainian or Russian language

- 6+ years of overall work experience on software development projects;

- 4+ years of commercial experience with backend development using NodeJS/NestJS/NX/TypeScript;

- 2+ years of commercial experience with frontend development using React/TypeScript;

- Demonstrable experience with participation in improvement of software architectures;

- Experience with common services offered through AWS (EC2, S3, RDS, Kafka, etc);

- Intermediate or higher level of English

Will be a plus:

- Willingness and prior experience with mentoring and/or leading less experienced colleagues;

- Prior work experience in Banking or FinTech

Company offers:

- Long-term employment with possibilities for professional growth

- Fully remote work

- Reasonably flexible schedule

- 15 days of paid vacation

- Regular performance reviews

✨ We are a product-first company that develops and scales its own fintech solutions. Our ecosystem combines cutting-edge technology with seamless service to deliver powerful tools for businesses. We’re constantly evolving, expanding our product line, and refining our solutions to stay ahead of the market.

About the Role:

🔧 We’re looking for a DevOps Engineer to join one of our key projects — a CRM system designed for high-performance client management.

Our Values 🌟

• Proactiveness: Drive growth and continuous innovation. 🚀
• Engagement: Every contribution matters to our shared goals. 🤝
• Responsibility: Own your actions with accuracy and reliability. 💼
• Solutions First: Face challenges with a positive, problem-solving mindset. 💪
• Teamwork: Achieve more through cohesive collaboration. 🤗
• Openness: Welcome new ideas and foster creative expression. ✨

Requirements 🛠️

• 3+ years of experience as a DevOps Engineer.
• 3+ years of hands-on experience with Kubernetes (including cluster management and Helm).
• 3+ years of experience with Configuration as Code, specifically using Ansible.
• 3+ years of experience with Infrastructure as Code (IaC), focusing on AWS and Terraform.
• 3+ years of practical experience in designing, setting up, and maintaining CI/CD pipelines using Jenkins (Groovy).
• Solid experience with monitoring and logging stacks: Prometheus / VictoriaMetrics, Grafana, and ELK.
• Deep knowledge of Linux administration (performance tuning, troubleshooting, and security).
• Strong understanding of networking: IP networking, routing, VPNs, DNS, Load Balancing, and Cloudflare.
• Proficiency in scripting languages: Bash and Python.

Key Responsibilities:

• Collaborate with developers and QA engineers to optimize development and testing environments
• Manage and enhance cloud infrastructure
• Design and implement build, deployment, and configuration management processes
• Troubleshoot and resolve infrastructure and deployment issues
• Build and maintain automation tools for infrastructure provisioning
• Ensure scalability and stability of systems
• Monitor metrics and identify improvement areas
• Build, maintain, and monitor configuration standards
• Support and maintain High-Availability systems
• Manage CI and CD tools alongside the development team
• Maintain comprehensive project documentation

🚀 Nice to Have:

• Experience in fintech/trading/forex domains.
• Experience with on-premises-like infrastructures and virtualized environments.
• Hands-on experience with alternative cloud providers (e.g., BitLaunch).
• DevOps certifications.

What We Offer 💼

• Work-Life Balance: 20 days of paid vacation and 10 days of paid sick leave annually (no medical certificate required). 🏖️
• Annual Benefit Cafeteria: A dedicated yearly budget for your personal growth and well-being. Spend it on sports, wellness, healthcare, or professional training — you choose what matters most. 🧘🎓
• Equipment Allowance: We value the tools you use. To cover the wear and tear of your own hardware, we provide a monthly compensation for using your personal equipment. 💻
• Growth & Feedback: Structured annual Performance Reviews to support your career progression and discuss your development. 📈
• Social & Team Fun: Engaging online team-building events with food and drinks delivery — we stay connected no matter where we are. 🍕🥂
• Full Financial Support: Comprehensive FOP (3rd group) tax compensation and accounting support. 📑

Ready to shape the future of Fintech? Join us on this journey and bring your DevOps expertise to our dynamic team!

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.

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 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.

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 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!)

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