Jobs Backend

986
  • · 115 views · 14 applications · 18d

    Senior .Net Engineer

    Full Remote · Ukraine · 5 years of experience · English - B2
    Our team is looking for a strong Senior .NET Software Engineer who is eager to become a part of a big team and develop complex solutions. About the project: Our client is a platform that provides global e-commerce and subscription billing solutions that...

    Our team is looking for a strong Senior .NET Software Engineer who is eager to become a part of a big team and develop complex solutions.

    About the project:
    Our client is a platform that provides global e-commerce and subscription billing solutions that help companies build long-term customer relationships and grow revenue streams. With its flexible, cloud-based billing and monetization platform, our client integrates seamlessly with client systems, simplifies subscription business models, and delivers an optimized online customer experience.

    Responsibilities:

    • Translating business logic into code
    • Automating business processes
    • Designing, building, and maintaining performant, efficient, reusable, and reliable code
    • Requirements review, requirements development
    • PCI DSS standard (four-eyes principle), QA, code review
    • Writing unit and integration tests
    • Problem-solving, root cause analysis, and 3rd-level support
    • Communicating with internal product owners and stakeholders, as well as external providers
    • Sharing new ideas, techniques, and methodologies

    Requirements:

    • A minimum of 7 years of software development experience
    • Strong knowledge and experience in designing and developing web backend solutions using .NET Framework and/or .NET Core
    • Strong experience with SQL (Oracle)
    • Strong understanding of design and architectural patterns
    • Knowledge of general tools in teamwork: JIRA, Git, Jenkins, Microsoft Visual Studio (or Rider)
    • Profound experience with unit testing frameworks
    • English on Upper-Intermediate level
    • Nice to have: Azure and/or AWS knowledge and experience
    • Nice to have: knowledge in any of these topics: e-commerce, payments, finance, subscription management,

    About the project:

    Tech stack: .NET (.NET Framework in transition to .NET Core), Web APIs (SOAP, REST), Oracle SQL, ORM, NUnit & MSpec tests, Moq, Jenkins, Gitlab, Jira, ELK-Stack

    • Well-maintained C# .NET Framework platform
    • Constant modernization -> transition to .NET Core
    • 14.000 tests (unit, integration)
    • new datacenters, no cloud
    • Any code you touch should be improved for the next person working with it
    • processes are built based on the Scrumban approach
    • We are gathering a strong .NET team to work on payment logic in our e-commerce solution
    • Adding and working on existing payment providers (credit cards, PayPal, direct debit, Google Pay, etc.)
    • Connecting with a multitude of web APIs and FTP servers
    More
  • · 41 views · 3 applications · 18d

    Back-End Team Lead (Node.js) (Poland)

    Office Work · Poland · Product · 7 years of experience · English - None
    We are looking for a skilled Team Lead Back-end Developer (Node.js). Responsibilities: Being transparent with the team about challenges, failures, and successes; Hiring and training technical personnel; Determining project requirements and...

    We are looking for a skilled Team Lead Back-end Developer (Node.js).

     

    Responsibilities:

    ✔️ Being transparent with the team about challenges, failures, and successes;

    ✔️ Hiring and training technical personnel;

    ✔️ Determining project requirements and developing work schedules for the team;

    ✔️ Delegating tasks and achieving daily, weekly, and monthly goals;

    ✔️ Liaising with team members and management to ensure projects are completed to standard;

    ✔️ Motivating staff and creating a space where they can ask questions and voice their concerns;

    ✔️ Delegating work and assignments to team members;

    ✔️ Collaborating with their team to identify and fix technical problems;

    ✔️ At least upper-intermediate level of English.

     

    And for the Developer part:

    ✔️ In-house platform development;

    ✔️ 3rd party API integrations;

    ✔️ Actively participate in developing new features from scratch.

     

    Requirements:

    ✔️ At least 8+ years of experience, 3+ years in leadership;

    ✔️ Excellent technical, diagnostic, and troubleshooting skills;

    ✔️ Strong leadership and organizational abilities;

    ✔️ Knowledge of JavaScript and the ECMAScript 6 standards;

    ✔️ 3+ years of commercial experience with Node.js;

    ✔️ 5+ years of commercial experience in web development;

    ✔️ Commercial experience of working with DB;

    ✔️ Commercial experience in implementing the REST and WebSockets;

    ✔️ Experience of GIT version control system;

    ✔️ Experience with databases MySQL;

    ✔️ Experience with RabbitMQ;

    ✔️ Experience with Redis.

     

    Nice to Have:

    ✔️ Experience with TypeScript.

     

    ✅ We offer excellent benefits, including but not limited to:

    🚀 Career growth opportunities in an international and dynamic environment;

    📚 Opportunity to develop language skills with partial compensation for language courses;

    🎁 Special gifts for birthdays, weddings, and newborns;

    🏝️ 26 working days of paid annual vacation, plus paid sick leave;

    🍲 Office snacks and refreshments;

    🏋️ ♂️ Sports package to support a healthy lifestyle;

    🩺 Comprehensive medical insurance for you and your partner;

    📍 Comfortable office with great facilities in a prime location;

    🎉 Exciting corporate events, team-building activities, and international company parties.

    More
  • · 182 views · 42 applications · 18d

    Senior Python Engineer (Fetching/Scraping experience)

    Full Remote · Countries of Europe or Ukraine · Product · 3 years of experience · English - B2 MilTech 🪖
    Are you passionate about safeguarding countries, societies, and businesses from information threats? Look no further! Our rapidly scaling company is committed to this crucial mission, collaborating with some of the world’s most influential...

    Are you passionate about safeguarding countries, societies, and businesses from information threats? 

    Look no further! Our rapidly scaling company is committed to this crucial mission, collaborating with some of the world’s most influential organizations, including NATO and the EU.

    If you’re ready to join a high-impact team shaping the future of online information resilience, we invite you to become part of our journey. Join us and help defend the digital world with purpose and innovation!

     

    Role Overview

    We are looking for a Senior Backend Engineer to join our Data Fetching Team and take ownership of building, scaling, and optimizing our distributed web-data ingestion pipelines.

    This role is focused on reliable large-scale data collection, web scraping, platform-specific fetchers (including TikTok and other modern social platforms), working with API and backend services powering our data intelligence products.

    This is a hands-on, senior role with real ownership over architecture, execution, and technical direction.

     

    Responsibilities

    • Design, build, and maintain high-performance data fetching and scraping services for large-scale ingestion of public web and platform content.
    • Develop and maintain platform-specific scrapers, especially for rapidly evolving ecosystems such as TikTok, X/Twitter, Instagram, YouTube, Telegram, and emerging platforms.
    • Architect and optimize distributed scraping workflows (task queues, schedulers, rate-limit control, retries, proxies, error-handling, observability, monitoring).
    • Build backend services in Python that power ingestion, normalization, parsing, and delivery of data to internal pipelines and storage layers.
    • Collaborate with product, data engineering, and AI teams to ensure high availability, quality, and reliability of the fetched data.
    • Contribute to existing re-usable components to enhance development velocity.
    • Follow best practices in software development when implementing new and refactoring the existing codebase.

     

    Requirements

    • Strong expertise in Python, including async programming, object-oriented principles, and ORM strategies.
    • Proven experience building production-grade web scrapers, crawlers, or platform data fetchers (preferably including TikTok or other modern JS-heavy platforms).
    • Advanced knowledge of scraping techniques, including headless browsers (Playwright/Puppeteer), content extraction, and browser automation.
    • Strong experience working with proxies, including rotation logic, tunneling, and pool management.
    • Solid algorithmic thinking, ability to reason about complex workflows in a microservice world.
    • Hands-on experience with relational databases and message queues.
    • Hands-on experience with Docker, Kubernetes, and cloud environments like AWS and GCP.
    • Strong communication skills and readiness to collaborate across engineering teams.

     

    We Offer

    • Opportunity to contribute to a mission-driven startup and support prestigious clients, including governments worldwide, enterprise clients, and leading NGOs in addressing information threats and tackling security challenges.
    • Autonomy and freedom to drive experiments and bring your own ideas to life.
    • Flexibility of fully remote work.
    • Flexible, unlimited time-off policy.
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  • · 81 views · 12 applications · 18d

    Senior to Lead C# Developer - Energy domain (IRC283818)

    Full Remote · Ukraine · 6 years of experience · English - B2
    Please note that the project location is Gdansk, and it's required to visit the office 2-3 times per week Job Description 5+ years of experience as .Net developer. At least 2 years as a Senior developer Proven experience with REST, Web API, Azure, Azure...

    Please note that the project location is Gdansk, and it's required to visit the office 2-3 times per week
    Job Description

    • 5+ years of experience as .Net developer. At least 2 years as a Senior developer
    • Proven experience with REST, Web API, Azure, Azure DevOps
    • Proven experience with working on a microservice-based project
    • Ability to lead a team of 4-6 engineers
    • 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 ability to maintain the highest level of confidentiality
    • Create robust code and translate business logic into project requirements
    • Develop code using development best practices, and an emphasis on security best practices
    • Leverage technologies to support business needs to attain high reusability and maintainability of current and newly developed systems
    • Provide system design recommendations based on technical requirements
    • Work independently on development tasks with a minimal amount of supervision
    • Write effective unit tests and integration tests to ensure high-quality software delivery
    • Work with the team of engineers and QAs on the product backlog, support the Scrum Master and PO

    Department/Project Description

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

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  • · 58 views · 3 applications · 18d

    Senior Python Developer with Kubernetes experience

    Full Remote · Ukraine · Product · 7 years of experience · English - C1
    We’re on the lookout for a passionate Senior Python Developer to join our client’s team in the cybersecurity space. If you love solving tough challenges, playing with state-of-the-art technologies, and shaping powerful cloud-based solutions, this is...

    We’re on the lookout for a passionate Senior Python Developer to join our client’s team in the cybersecurity space. 

    If you love solving tough challenges, playing with state-of-the-art technologies, and shaping powerful cloud-based solutions, this is your chance to make a real impact. You’ll work in a dynamic environment, alongside brilliant teammates, building innovative systems that help protect organizations from ever-evolving digital threats.

    About the project

    Since the amount of cyber threats and dark web sources is growing daily, products for their elimination are critically needed. Our partner, a high-tech software company from Israel, took on this challenge.
     

    They offer cyber threat intelligence (CTI) solutions for cybersecurity teams to reveal their most critical known and unknown digital risks earlier. The team develops its CTI & Attack SaaS platform to prevent, detect, investigate, and remediate phishing, fraud, data leaks, and external vulnerabilities.
     

    Clients are more than 100 companies worldwide, including Fortune 500 leaders, in financial, retail, gaming, entertainment and media industries.
     

    Responsibilities

    • Influence — take part in day-to-day discussions on the direction, design and architecture of our product.
    • End-to-end development of software components, constantly re-inventing and improving our infrastructures and tech-stack to meet our scale expectations from an engineering standpoint.
    • The ability to create technical designs for complex problems.
    • Assist other team members with code and design reviews and provide constructive feedback.
    • Be a part of a team of passionate, hardworking and super-professional Back End developers.
    • Gain a deep, wide and solid understanding of the World Wide Web (Surface, Deep and Dark parts).
    • Improve and promote our innovative tech-stack — play and asses tools we should adopt.
    • Work in, out and around AWS.
    • Work with an amazing group of colleagues and decision makers in various interfaces.


    Requirements

    • 7+ years’ experience in Python development.
    • Demonstrated ability to produce high-performance, maintainable, and reusable code.
    • Knowledge in high-level design and architectural practices.
    • Proficiency with cloud technologies and services, such as AWS (EC2, S3, Lambda, Streaming, EMR, EKS).
    • Experience with ElasticSearch, MongoDB, MySQL, PostgreSQL, Redis, and relational DBs.
    • Kubernetes/K8s platforms such as AWS EKS is a must. This is a cruicial requirement.
    • Agile methodology practitioner.
    • Experience in a Production SaaS environment.
    • Knowledge in building web applications using FastAPI
    • Maintaining, monitoring, and debugging microservices architectures Must.
    • Familiarity with streaming solutions including SQS, Kafka, and Celery is expected.

      Tech Stack
    • SaaS Web Application
    • AWS cloud
    • Kubernetes & Microservices architecture
    • Databases — MySQL, Redis, MongoDB, Kafka
    • Monitoring tools — Prometheus, Grafana, Kibana, etc.
    • And other related technologies

      Interview Process:
      1) HR Interview with Newxel (30 min).

      2) Meeting with the Tech Lead (30-40 min).
      2) Technical Interview + live coding (1–2 hours).
      3) Meeting with the Hiring Manager (up to 1 hour — overall experience, learning more about the company and goals).
      4) Іnterview with HRD (30 min).
      5) Reference check.


    What we offer

    • Competitive salary and benefits package
    • Medical insurance
    • Top equipment kit
    • Full Remote
    • Collaborative and innovative work environment
    • Career growth and development opportunities
    • A chance to work with a talented and driven team of professional


     

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  • · 27 views · 2 applications · 18d

    Senior Visualization Application Developer (Java, OpenGL)

    Full Remote · Ukraine · 5 years of experience · English - B2
    Project description The SEM product is embedded within the Geosciences Suite of Applications. This application has multiple views consisting of both 2D and 3D visualizations. The current data visualization is not sufficient for what we would like it to...

    Project description

    The SEM product is embedded within the Geosciences Suite of Applications. This application has multiple views consisting of both 2D and 3D visualizations. The current data visualization is not sufficient for what we would like it to be. This role is expected to work with the lead and the product owner to understand the current shortcomings, investigate and research potential solutions, propose these solutions to the teams, and then work on the implementation of the agreed upon work. To get to this stage, the developers will also need to learn the inner workings of the visualization framework within Geoscience.

    Responsibilities

    Design, develop, and maintain graphics-intensive modules within the Geoscience platform using Java and OpenGL.

    Implement advanced 2D and 3D visualization features for seismic, geological, and geospatial data.

    Optimize rendering performance and ensure cross-platform compatibility, particularly in Linux environments.

    Collaborate with geoscientists and software engineers to translate domain-specific requirements into technical solutions.

    Participate in code reviews, testing, and documentation to maintain high-quality software standards.

    Stay updated with the latest developments in graphics technologies and geoscience applications.

    Skills

    Must have

    Bachelor's or Master's degree in Computer Science, Geoscience, or a related field.

    5+ years of professional experience in Java development with a focus on graphics programming.

    Proficiency in OpenGL and related graphics libraries for rendering complex datasets.

    Strong experience working in Linux environments, including shell scripting and system optimization.

    Excellent problem-solving skills and the ability to work collaboratively in a multidisciplinary team.

    Nice to have

    Experience with geoscience software platforms.

    Familiarity with geoscience data formats and visualization techniques.

    Knowledge of additional programming languages such as C++ or Python.

    Understanding of GIS technologies and spatial data analysis.

    Experience with agile development methodologies and version control systems like Git

    Languages

    English: B2 Upper Intermediate

    More
  • · 135 views · 30 applications · 18d

    Middle Java Engineer

    Ukraine · 4 years of experience · English - B2
    N-iX is a software development service company that helps businesses across the globe develop successful software products. During 20 years on the market and by leveraging the capabilities of Easter Europe talents, the company has grown to 2000+...

    N-iX is a software development service company that helps businesses across the globe develop successful software products. During 20 years on the market and by leveraging the capabilities of Easter Europe talents, the company has grown to 2000+ professionals with a broad portfolio of customers in the area of Fortune 500 companies as well as technological start-ups. With its headquarters in Lviv, Ukraine, the company also has multiple development offices in the East European region and representative entities in the United States of America, Sweden, and Malta.

    Our client - one of the world's largest fashion retailers selling in 215 markets through its online platform or its 6,477 stores in 95 markets. By working closely together as a single company globally focused on the key elements of fashion production – design, manufacture, distribution, and retail. All the production is founded on three pillars – flexibility, digital integration, and sustainability.

     

    Responsibilities:

    • Be a part of the Scrum team and deliver value to users by developing high-quality functionality
    • Maintain and extend already existing applications
    • Actively participate in refinements, plannings, set estimations and follow commitments
    • 80% unit tests coverage is a must
    • Follow Eslint, Prettier, SonarQube and other code quality rules
    • Follow code review processes

     

    Requirements:

    • 4+ years of Java development, Maven
    • 2+ years of Spring framework and building Spring web applications
    • Familiar with the microservices concept
    • Experience developing REST interfaces
    • Design, coding and debugging skills
    • OOP, OOD, and Design Patterns proficient
    • Working knowledge of NoSQL (MySQL) DB technologies – Mongo DB
    • Understanding of Kafka, Kafka streaming
    • Familiar with GrayLog, Grafana
    • Strong knowledge of Unit testing
    • Basic understanding of Scrum and main aspects of working in Agile environment

     

    Nice to have:

    • Working experience in an Agile environment, a clear understanding of Agile methodologies mindset, and development practices applicable to them
    • Excellent communication skills, product-oriented mindset, focus on team results, willingness to continuous personal and team improvements
    • Upper-Intermediate English level (there will be a lot of communication with the client)

     

    We offer*:

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

    *not applicable for freelancers

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  • · 226 views · 8 applications · 18d

    Senior Fullstack Engineer to $5000

    Full Remote · Countries of Europe or Ukraine · 6 years of experience · English - C1
    We’re building Firesale — a platform where sellers create AI-powered listings by simply recording a video. Buyers see beautiful, interactive posts generated automatically. It’s fast, visual, and redefines how products are presented and...

    We’re building Firesale — a platform where sellers create AI-powered listings by simply recording a video. Buyers see beautiful, interactive posts generated automatically. It’s fast, visual, and redefines how products are presented and discovered.

    Everything is built from scratch with a modular, service-oriented architecture using NestJS and NextJS.

     

    We’ve raised $1.5M in investment and secured an additional $500K in grants and credit programs from companies like NVIDIA, Google, Amazon, and others — giving us a solid runway and the ability to scale confidently.

     

    Watch the intro video (1 min)
    📺 https://youtu.be/hU2vJU8fo0w?feature=shared

    The ideal candidate profile includes:

    • 6+ years of commercial software engineering experience
    • 3+ years in a senior-level position
    • 3+ years of hands-on backend development experience (NestJS, modular microservices)
    • 3+ years of hands-on frontend development experience (React, Next.js)
    • Strong grasp of DDD, Clean Architecture, KISS
    • Ability to build and own complete features from UI to backend integration
    • Self-directed, detail-oriented, and committed to code quality


    Nice to have:

    • Familiarity with NATS
    • Exposure to event-driven systems
    • Exposure to CI/CD pipelines (GitHub Actions, Docker)

     

    Role & responsibilities:

    • Initial focus on frontend: building key UI flows, interactions, and responsive forms
    • Integrate with backend services via REST and SSE
    • Help define and maintain architectural consistency and code quality
    • Collaborate directly with the founder/CTO, shaping the product from day one

     

    What we offer:

    • Modern architecture: no legacy, no shortcuts, full control
    • Async collaboration, flexible hours, remote-first
    • Direct impact: everything you build will ship to real users
    • Fast feedback loop, deep technical discussions, and strong product/tech alignment
    • Opportunity to grow into a core engineering or lead role
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  • · 484 views · 195 applications · 18d

    (2x) Java Full Stack Developer (Intermediate to Senior) to $4500

    Full Remote · Azerbaijan, Georgia, Poland, Romania, Ukraine · 3 years of experience · English - B2
    We are looking for 2 strong Java developers for the new startup we start working with, with at least 3+ years of experience as a back-end engineer. We need an excellent knowledge of: - Java, JVM and the ecosystem - Strong Databases experience( SQL,...

    We are looking for 2 strong Java developers for the new startup we start working with, with at least 3+ years of experience as a back-end engineer.

    We need an excellent knowledge of:

    - Java, JVM and the ecosystem

    - Strong Databases experience( SQL, NoSQL)

    - Strong analytical thinking

    - Familiar with React and ready to work as Full-stack

    - Ability to be a good teamplayer, communicate and contribute

    - Databases optimizations knowledge is a big plus
    - AWS experience is a big plus

    We need a developer who is comfortable across the entire stack and prioritizes architectural ownership.

    • Tech Stack: Java (Spring Boot), React, and MySQL running on AWS.
    • Key Requirements: Proven experience building and maintaining full stack applications with strong communication skills to explain technical trade-offs.
    • AI-Assisted Workflow: We expect candidates to be highly proficient with AI productivity tools like Copilot or Cursor. We practice "Structured AI Coding" rather than "Vibe Coding." This means using AI to accelerate delivery while maintaining full manual oversight of the logic. We do not delegate the architectural process to the tools



      About us: Mindecs - is an outstaffing/outsourcing company that's working with leading brands and startups.
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  • · 62 views · 4 applications · 19d

    Senior Java Engineer (Go and Python skills)

    Full Remote · Poland · 6 years of experience · English - B2
    We’re looking for a Senior Java Engineer with Python&Golang skills to join our team. Our client is defining the future of cybersecurity through our XDR platform that automatically prevents, detects, and responds to threats in real time. Singularity XDR...

    We’re looking for a Senior Java Engineer with Python&Golang skills to join our team.


    Our client is defining the future of cybersecurity through our XDR platform that automatically prevents, detects, and responds to threats in real time. Singularity XDR ingests data and leverages our patented AI models to deliver autonomous protection.

     

    Our team is responsible for the backend part for the main product line  - securing tens of millions of devices across the globe of all kinds of OS (Windows, Linux, macOS), and processing billions of security events every day.

     

    You'll be joining a team with a significant impact on how our customers' environments (incl. 4 of Fortune10 companies, hundreds of Global2000 or governments) are protected, how they interact with agents, gain visibility into their security posture, and understand the risks and act upon them.

     

    What will you do?
    Design, develop and support backend system serving for endpoint security
    ●      Help us with initiatives around moving our services to a new deployment model.
    ●      Tuning and adjusting our services to work with new CPU architectures.
    ●      Improving the observability for our services.

     

    • Requirements: 
      7+ years of extensive software engineering experience, including proven expertise in developing large-scale distributed systems and microservices architecture, with a focus on performance, scalability and reliability
    • Proficiency in Java
    • knowledge of Golang and Python 
    • Experience with cloud platforms (AWS and/or GCP) and Kubernetes (must)
    • Experience with Kafka or similar solutions is a plus
    More
  • · 57 views · 5 applications · 19d

    Lead Go Engineer

    Full Remote · Ukraine · 5 years of experience · English - B2
    We are looking for a Lead Go Engineer to join our team! The ideal candidate will take ownership of designing, developing, and maintaining scalable, high-performance applications, while also mentoring and leading a team of engineers. Experience with Java...

    We are looking for a Lead Go Engineer to join our team! The ideal candidate will take ownership of designing, developing, and maintaining scalable, high-performance applications, while also mentoring and leading a team of engineers. Experience with Java is a plus.

    Our client is one of Azerbaijan's leading mobile telecommunication providers, with the most significant 49% market share and 5.0 million customers. Together with N-iX, our customer plans to develop a Financial Payment Technology Platform Solution that allows B2C interactions for its impressive customer base, which includes 99.8% of Azerbaijan's population. 
     

    Responsibilities:

    • Lead the design, development, and deployment of backend microservices using Go (Java is a plus)
    • Drive architectural decisions and ensure best practices in software development
    • Mentor and guide team members, fostering a culture of continuous learning and high performance
    • Collaborate with product managers and stakeholders to deliver solutions that meet business objectives
    • Ensure code quality, scalability, and maintainability through code reviews, testing, and automation.
       

    Requirements:

    • Extensive production experience with Go.
    • Strong hands-on knowledge of Go: concurrency (goroutines/channels), context/timeouts, and writing idiomatic, maintainable code.
    • Experience designing, building, and operating high-load backend services and microservices (scalability, resilience, consistency trade-offs).
    • Hands-on experience with API design and implementation: REST and/or gRPC, versioning, and backward compatibility.
    • Solid knowledge of datastores (SQL/NoSQL), caching, and data consistency fundamentals.
    • Production engineering skills: automated testing (unit/integration), observability (logs/metrics/traces), troubleshooting, and performance profiling.
    • Proven track record of leading engineering teams and delivering complex projects; strong communication and leadership skills.
    • Cloud platforms: AWS (preferred, not required)
       

    Preferred:

    • Experience with CI/CD pipelines; containerization and orchestration (Docker, Kubernetes); and production monitoring/observability tools.
    • Familiarity with Agile/Scrum practices and working in cross-functional teams.

     

    We offer*:

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

    *not applicable for freelancers

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  • · 96 views · 17 applications · 19d

    SeniorGo (Golang) Engineer — Core Crypto

    Full Remote · Countries of Europe or Ukraine · Product · 4 years of experience · English - A1
    Product: High-load centralized crypto exchange (CEX) Responsibilities Build and operate wallet / blockchain integration services in Go:deposits: ingestion of incoming transactions, confirmations, reorg handling; withdrawals: transaction...


    Product: High-load centralized crypto exchange (CEX) 
     

    Responsibilities

    • Build and operate wallet / blockchain integration services in Go:
      • deposits: ingestion of incoming transactions, confirmations, reorg handling;
      • withdrawals: transaction building/signing/broadcasting, fee management, queues, retries;
      • addresses & wallets: generation, assignment, monitoring, hot/warm wallet logic.
    • Integrate with security infrastructure: HSM (e.g., Thales Luna), key policies, strict access control.
    • Design high-throughput pipelines with Kafka: idempotent consumers/producers, delivery guarantees, deduplication.
    • Develop internal gRPC/REST APIs for collaboration with balance, risk/AML, and admin services.
    • Own observability & reliability: metrics, tracing, alerting, graceful degradation, load testing.
    • Investigate incidents, perform RCA, and continuously harden reliability and security.

    Tech stack

    • Go (core services: wallets, blockchain integrations)
    • PostgreSQL (transactional), Redis (caching/locks), Kafka (event bus)
    • ClickHouse (analytics)
    • AWS (MSK, ECS/EKS, S3, KMS, etc.)
    • gRPC, CQRS/Event Sourcing, strict audit logging

    Requirements (must-have)

    • Strong Go fundamentals: concurrency (goroutines/channels), profiling, performance optimization, correct context/timeouts usage.
    • Production-grade microservices experience: health checks, graceful shutdown, retries, rate limiting, circuit breakers.
    • Kafka hands-on: consumer groups, offsets, idempotency patterns, application-level exactly-once strategies.
    • PostgreSQL experience: transactions, locking behavior, indexes, migrations, handling contention.
    • Security basics: secrets/keys handling, least privilege, audit trails, secure input processing.

    Nice to have

    • Blockchain integration experience (EVM/BTC/TRX/TON, etc.), reorg/mempool, fee strategy.all top 20 network
    • HSM/KMS signing flows, key segregation, operational security procedures.
    • Fintech/exchange background: double-entry accounting concepts, holds/reservations, dispute case handling.
    • High-load systems: 10k+ msg/s pipelines, low-latency design, chaos testing, load testing methodology.

    Why join

    • Real security and money flows: strict controls, auditability, realistic threat models.
    • High-load engineering challenges: idempotency, consistency, concurrency, failure handling.
    • Architectural impact: influence standards, patterns, and core design decisions.
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  • · 172 views · 21 applications · 19d

    Backend Developer (PHP / AWS) to $3000

    Full Remote · Countries of Europe or Ukraine · 3 years of experience · English - B2
    Truffle (hiretruffle.com) is a bootstrapped SaaS startup building an AI-powered hiring platform. We ship fast, iterate constantly, and care about quality. We're a small team — no VC politics, no layers. You'll work directly with the founders and ship...

    Truffle (hiretruffle.com) is a bootstrapped SaaS startup building an AI-powered hiring platform. We ship fast, iterate constantly, and care about quality.
     

    We're a small team — no VC politics, no layers. You'll work directly with the founders and ship real product.
     

    What you'll do:

    • Build and ship backend product work: APIs, business logic, data models, integrations
    • Work closely with our frontend developer to keep the FE/BE loop tight and unblocked
    • Write clean, maintainable code with appropriate test coverage
    • Debug production issues and contribute to system stability
       

    Stack:

    • PHP (Slim v4), REST APIs, background jobs/workers
    • MySQL (RDS)
    • AWS (S3, IAM, CloudWatch — ECS/Fargate is a plus)
    • GitHub Actions, Docker, Linux
       

    What we offer:

    • Full-time contract, 3 months to start, with clear path to permanent
    • Direct access to founders — no middle management
    • Paid micro-project and optional paid trial sprint during hiring
    • Bootstrapped and profitable — stability, not runway
       

    Hiring process:

    1. Short intro call
    2. Technical conversation (real discussion, not a whiteboard quiz)
    3. Paid micro-project (60–90 min, compensated)
    4. Optional 2-week paid trial sprint
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  • · 244 views · 38 applications · 19d

    Junior .Net developer/Data Import Support Specialist

    Full Remote · EU · 1 year of experience · English - B2
    About the project: We are seeking a detail-oriented and tech-savvy Junior .Net developer\Data Import Support Specialist to join our team. The ideal candidate will be responsible for assisting clients and internal teams with data import processes,...

    About the project:

     We are seeking a detail-oriented and tech-savvy Junior .Net developer\Data Import Support Specialist to join our team. 

     

    The ideal candidate will be responsible for assisting clients and internal teams with data import processes, troubleshooting issues, and ensuring data integrity. This role requires strong analytical skills, problem-solving abilities, and excellent customer service.

     

    Does this relate to you?

    • 1+ year of experience in data import, data processing, or technical support roles.
    • Proficiency in SQL( mysql and postgres), Excel, or other data manipulation tools.
    • Basic .Net and C# knowdlege
    • Strong analytical and problem-solving skills.
    • Excellent communication and customer service skills.
    • Ability to work independently and collaboratively in a fast-paced environment.

      

    A new team member will be in charge of:

    • Support clients and internal teams in importing, validating, and processing data.
    • Troubleshoot data import issues and provide timely resolutions.
    • Ensure data accuracy, consistency, and compliance with internal standards.
    • Collaborate with developers, analysts, and project managers to improve data import workflows.
    • Document common issues and solutions to enhance process efficiency.
    • Assist with system configurations and data mappings as needed.
    • Provide training and guidance on best practices for data imports.

     

    Additional information:
    The workday on the project starts at 4 PM Kyiv time.

     

    Ready to try your hand? Send your CV without a doubt!

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  • · 106 views · 13 applications · 19d

    Senior .NET Engineer

    Full Remote · Ukraine · 5 years of experience · English - B2
    We are looking for a skillful Senior .NET Engineer. A perfect candidate must be able to adjust to constant business change. Common types of changes include new requirements, evolving goals and strategies, and emerging technologies. About the...

    We are looking for a skillful Senior .NET Engineer. A perfect candidate must be able to adjust to constant business change. Common types of changes include new requirements, evolving goals and strategies, and emerging technologies.

     

    About the client:

    Founded in 1948, Fluke Corporation is a huge US-based enterprise with over 2,500 employees. It is a world leader in compact, professional electronic test tools, and software for measuring and condition monitoring.

    We are collaborating on the solutions for the mobile operation, control, and maintenance of automated systems. The company’s products are designed for environments where downtime is a critical issue such as airports, warehouses, distribution centers, manufacturing operations, power stations, water treatment facilities, or renewable energy farms. The solutions are used by global leaders in manufacturing, airport operations, and logistics, such as Honda North America, Toyota UK, Volkswagen, Boston Logan Airport, Allessa Chemie, Zalando, Baur, Brillux, as well as many airports in Europe.

    X5 eMaint - A CMMS software solution that centralizes maintenance information, facilitates processes, and automates some tasks to improve efficiency. Computerized maintenance management system software optimizes the use, availability, and life span of equipment, machinery, fleets, infrastructures, facilities, or operations

     

    Requirements:

    • At least 5 years of experience in software development projects. 
    • Experience in working with big enterprise project
    • Experience with implementing enterprise cloud native solutions in AWS (preferred) or MS Azure. 
    • Experience in designing and developing asynchronous message-driven micro services with experience in RabbitMQ or similar. 
    • Good knowledge in Relational and Non Relational DB design. 
    • Good knowledge in functional and/or object-oriented software design and  domain-driven design (desired) using .NET and C#.  
    • Practical knowledge designing RESTful  and GraphQL (desired) API. 
    • Good knowledge in Continuous integration and delivery best practices. 
    • Upper-intermediate level of English (both oral and written)

       

    Nice to have:

    • Experience in designing and developing user interfaces with React.js, TypeScript (desired) and CSS/Sass. 
    • Experience collaborating with UX and Product  
    • Experience and passion for developing visually polished, engaging and fluid interfaces.
    • Excellent problem-solving and collaboration skills.  
    • Great written, verbal, technical and  interpersonal communications skills. 

     

    Responsibilities:

    • Design and implement complex, scalable, and maintainable full-stack solutions that  align with business goals.  
    • Provide technical leadership, mentoring, and guidance to a team of developers, fostering a culture of continuous learning  and improvement. 
    • Write efficient, testable, and maintainable code. 
    • Drive initiatives to improve development  processes, automation, and overall team efficiency. 
    • Troubleshoot and resolve technical issues, identifying root causes and implementing effective solutions. 
    • Collaborate with stakeholders across the company including engineering, product,  support, and marketing to launch new features.
    • Product development within Fluke Reliability is  an internationally distributed and diverse  organization. We embrace a culture of  innovation, continuous improvement, and individual empowerment to provide an  environment where individuals can grow and thrive.

     

    We offer*:

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

    *not applicable for freelancers

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