Jobs Backend

Job Title:

Block-Builder Engineer

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

An advanced block construction platform operating on the Ethereum mainnet that processes order flow, transaction bundles, and submits finalized blocks through relay networks in real time. It addresses neutral and efficient block building to unlock new decentralized finance capabilities, including intrablock lending and execution extensions. The system handles high-throughput data pipelines and strict latency requirements, backed by comprehensive observability and analytics to drive iterative improvements based on live production metrics. Strong engineers are essential to maintain system health under real-time load, verify data-driven hypotheses, and innovate on core protocol logic.

About the Role:

The Block-Builder Engineer will join an experienced team in Kraków or Warsaw to develop and maintain a next-generation Ethereum block construction system. You will own pipeline components that ingest order flow and transaction bundles, manage relay submission paths, and ensure stable performance under real-time load. Your work will include building and refining observability platforms, conducting controlled A/B experiments, and driving reliability improvements such as panic mitigation and latency regression detection. As you ramp, you will contribute to optimization-driven block building logic, on-chain intrablock lending protocols, and an execution extension, gaining autonomy and deep technical ownership across the core stack.

Key Responsibilities:

- Integrate and process order-flow ingestion, bundle and transaction handling, back-pressure management, and reintegration of data for block inputs.

- Develop and maintain relay submission paths to ensure end-to-end block delivery under production load.

- Build and enhance telemetry and dashboards using Grafana, Prometheus, Loki and SQL to provide trusted observability.

- Diagnose and correct measurement issues—broken counters, misleading dashboards, and erroneous denominators—to maintain metric accuracy.

- Design, execute and analyze controlled A/B experiments in production, reporting findings objectively, including inconclusive results.

- Identify and resolve system panics, dropped messages, and latency regressions, with automated tests to prevent recurrence.

- Optimize data pipelines and processing systems for high-throughput, low-latency performance.

- Contribute to the development of intrablock lending protocols and associated trusted-execution components.

- Collaborate on an execution extension (BEX) and future protocol and exchange-layer enhancements.

Required Competence and Skills:

- 2–4 years of professional software engineering experience shipping and operating production systems.

- Minimum 2 years working on Ethereum or other EVM-compatible blockchains.

- Proficiency in Rust or strong systems experience in Go, C++ or Java with eagerness to adopt Rust.

- Solid understanding of concurrent and real-time code within large, existing codebases.

- Strong SQL skills and practical experience with Python for data analysis and tooling.

- Familiarity with monitoring and analytics tooling and a drive to ensure metric correctness.

- Rigorous engineering habits, including comprehensive testing and clear distinction between verified and assumed behavior.

- Data-driven mindset with a habit of querying logs and databases to validate change impact.

Nice to Have:

- Exposure to Ethereum block-building protocols (PBS/MEV), smart contract interactions, or trading systems.

- Experience with high-throughput data pipelines, time-series databases, or large-scale analytics.

- Familiarity with Ethereum client internals (reth, geth, revm) or deploying services on Kubernetes and Docker.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.

About ChatRevenue.ai 

ChatRevenue.ai was founded by Ratmir Timashev (founder of Veeam) and Vlad Voskresensky (founder of Revenue Grid) to create the next generation of CRM systems.  

We’re building an AI-native CRM platform that completely redefines how sales automation works.  
By structuring data for intelligent automation, we enable agentic AI to design workflows, assist Sales Leaders and Reps in real time, and generate predictable sales funnels – all through a simple, chat-driven interface.  

Our mission: to build a CRM that works for User, not the other way around. 

About the role 

We are looking for a Principal Backend Engineer with strong Python experience and a proven track record of building and owning production backend systems. 

This is a hands-on engineering role focused on: 

• Python backend 
• FastAPI 
• Data-heavy systems 
• AI / LLM product features 
• System architecture and scalability 

We are looking for someone who can take ownership of a backend domain, make technical decisions, and build reliable systems from idea to production. 

What you will do 

• Design, build, deploy, and maintain core backend services using Python and FastAPI 
• Own backend architecture, data flows, and technical decisions in your domain 
  Build and scale data-intensive systems, integrations, and pipelines 
• Work on AI / LLM-driven product features together with the engineering team 
• Improve system performance, scalability, reliability, and observability 
• Contribute to engineering practices: testing, CI/CD, security, and code quality 
• Work closely with product and engineering to deliver high-impact features 

What we are looking for 

• 7+ years of hands-on backend development experience 
• Strong commercial experience with Python in production 
• Python should be your primary backend language 
• Strong experience with FastAPI, APIs, Docker, Git, and CI/CD 
• Experience owning backend systems end-to-end: architecture, performance, data, reliability 
• Strong knowledge of PostgreSQL and data-heavy systems  
• Experience building distributed, scalable, or high-load systems 
• Good understanding of system design and performance optimization 
• Ability to work with ambiguity and take ownership without micromanagement 
• High ownership, independence, and product mindset 

Nice to have 

• Experience integrating LLMs / AI into backend systems 
• Experience with RAG, embeddings, vector databases, or AI assistants 
• Experience with Kafka, Azure Event Hub, or other event-driven systems 
• Experience with Kubernetes and cloud infrastructure, especially Azure 
• Experience building ETL / ELT pipelines 
• Experience working with structured and unstructured data 
• Production observability, tracing, monitoring, and optimization experience 

This role is likely a strong match for people who 

• Enjoy owning backend systems end-to-end, not just implementing isolated tasks 
• Feel strongest in Python as their main backend language 
• Have worked on production systems where reliability, performance, and scale matter 
• Want to have direct influence on technical decisions and architecture 
• Are comfortable working in an early-stage, high-ownership environment 

What we offer 

• Remote-first setup 
• Flexible schedule aligned with European time zones 
• A core engineering role in an AI-native product 
• Direct influence on technical decisions and architecture 
• Real ownership and visible product impact 
• Opportunity to grow into technical leadership / domain ownership 

If you have strong Python backend fundamentals, experience owning production systems, and interest in AI-native products, we’d love to talk. 

We are developing a platform that receives securities and price data from multiple providers, enriches and validates it, and distributes the consolidated data to internal bank systems. Our team manages various web and desktop applications, web services, and Linux environments that enable visualization of securities and execution of related workflows.

Our components are built using Java 8-11, JavaScript/TypeScript, Oracle, and Spring 4-5, including Spring Boot.

• Responsibilities:

  - Develop back-end systems using Java with well-tested code.
  - Support the development environment, primarily through automation using Jenkins CI and Bash.
  - Evaluate and implement new development tools, libraries, and methodologies to enhance quality.
  - Conduct peer code reviews for changes in the project codebase.
  - Collaborate effectively with a global team across multiple time zones, demonstrating strong verbal and written communication skills.
  - Provide constructive suggestions and alternative solutions to team members to identify the most efficient and optimized approaches.

• Mandatory Skills Description:

  The role requires extensive expertise in Java SE and Java EE with over a decade of professional experience, emphasizing strong proficiency in the Spring framework, including Boot, IoC, MVC, AOP, Security, Data, JDBC, and testing components. The candidate must be skilled in SQL and relational databases, specifically Oracle, and have a solid understanding of Servlets, servlet containers such as Tomcat, and application servers like Weblogic. Familiarity with CI/CD processes and tools, notably TeamCity and Jenkins, is also essential.
  
  Hard skills include:
  - Advanced Java SE and Java EE development
  - Comprehensive Spring framework application
  - SQL query writing and database management using Oracle
  - Knowledge of Servlets, Tomcat, and Weblogic server environments
  - Experience with CI/CD pipelines using TeamCity and Jenkins
  - Practical Linux system navigation, file and permission management, user and group administration, process and service handling, security keys and certificates, and basic Bash scripting
  
  Soft skills focus on:
  - Analytical problem-solving to identify and implement effective, maintainable solutions
  - Collaborative discussion and consensus-building within the team to select optimal approaches

Creatio is an AI CRM and workflow platform where people and AI agents work together — with no limits on users, agents, or scale. We help midsize and large organizations run customer workflows in the AI era. With a global team and a large ecosystem of partners, Creatio serves thousands of customers in over 100 countries and automates tens of millions of workflows daily. Genuine care for our clients and partners is at the heart of our DNA.

We’re proud to be recognized by top industry analysts as a Leader and Strong Performer in multiple Gartner and Forrester reports.  

In 2025, Creatio was named to Inc.’s Best Workplaces list, recognizing our commitment to employee wellbeing and a strong workplace culture.

Who We're Looking For:

You'll join the team responsible for the engineering foundation of the Creatio platform, the core layer that powers every product and feature built across the ecosystem. This organization owns the platform runtime, data access layer, core services, performance-critical infrastructure, platform APIs, and extensibility framework.

The team's mission is to build highly scalable, reliable, and backward-compatible platform capabilities that enable dozens of engineering teams to innovate efficiently. Success in this role means designing and evolving the low-level architecture that serves as the backbone of the entire Creatio platform, balancing performance, maintainability, and long-term technical sustainability.

Responsibilities:

• Development of architectural solutions and development of prototypes together with the team.
• Regular monitoring of the effectiveness of development processes, their optimization, and improvement.
• Implementation of innovative tools, approaches, and standards in product development.
• Facilitation of team meetings (backlog refinement, sprint review (demo), planning).
• Execution of backlog tasks: pair programming, development, consultations on complex tasks).
• Control of the work of the incident team on the 4th line, responsibility for resolving incidents within the framework of the SLA.
• Designing, coding, testing, and debugging software according to specifications and requirements.
• Collaborating with stakeholders, product managers.
• Conducting unit tests, integration tests, and system tests.

Requirements:

• 6+ years of overall programming experience, strongly focusing on .Net.
• 1 year of experience in a leadership/mentor role.
• 2+ years of experience with Web applications.
• Knowledge of OOP, C#, and .NET.
• EntityFramework, WebAPI, ASP.NET MVC, ASP.NET Core., NUnit, Mock. DOM, CSS/SASS.
• Experience working with databases (MS SQL Server, PostgreSQL, Oracle).
• English level - Upper-Intermediate (spoken and business writing) or higher.

What to expect from us:

• Growth & Development: Clear career paths, mentorship opportunities, and access to continuous learning to help you reach your full potential.
• Flexibility & Well-Being: We provide flexible work arrangements and initiatives that empower you to manage your schedule effectively, stay productive, and thrive both personally and professionally.
• Recognition & Impact: A culture that celebrates achievements, values your ideas, and empowers you to make real contributions from day one.
• Innovative Culture: Be part of a company that embraces new ideas, modern technologies, and bold thinking to stay ahead of the curve.
• Benefits & Rewards Package: We provide competitive compensation and benefits designed to support you and your family. Our rewards approach goes beyond salary, recognizing your contributions and commitment. The exact package may vary depending on your country of residence and employment type.

Creatio is a global vendor of an agentic CRM & workflow platform with no-code and AI at its core. We help organizations automate customer and operational workflows achieving the fastest time-to-value and the highest ROI on the market. Millions of workflows run on Creatio daily, supporting thousands of clients in over 100 countries. Genuine care for our clients and partners is at the heart of our DNA. 

We’re proud to be recognized by top industry analysts as a Leader and Strong Performer in multiple Gartner and Forrester reports. 

In 2025, Creatio was named to Inc.’s Best Workplaces list, recognizing our commitment to employee wellbeing and a strong workplace culture.

Who We’re Looking For:

We invite an experienced Technical Lead to join our ALM Domain for collaborating within Scrum teams. ALM Domain teams build platform-level tools and capabilities that support the full Application Lifecycle of Creatio applications. This includes development and packaging frameworks, versioning, configuration management, delivery pipelines, testing, monitoring and alerting, building and integrating CI/CD tools, and lifecycle automation for internal teams and external customers/partners. The focus is on making application development and delivery and maintenance on Creatio predictable, repeatable, and safe across environments.

Team composition: 3 Developers, 1 QA, 1 Technical Lead, 1 Agile Coach, 1 Product Owner

Responsibilities:  

• Lead the design and development of architectural solutions and prototypes alongside the system architect and development team.
• Build, test, and debug high-quality back-end and front-end code.
• Support seamless product operation by addressing customer cases and ensuring system reliability.
• Continuously monitor and optimize development processes to enhance team productivity and quality.
• Drive adoption of innovative tools, standards, and best practices in software development.
• Collaborate closely with product managers, stakeholders, and leadership to align technical vision with business goals.

• Conduct technical interviews, mentor developers, and facilitate onboarding and professional growth.

   

Requirements: 

• Minimum 6 years of software development experience with full-stack expertise in .NET and Angular.
• At least 1 year in a technical lead or team lead role, guiding teams successfully.
• Strong mastery of object-oriented programming and solid application of KISS, SOLID, and DRY principles.
• Proficient in C# and modern .NET runtime environments (.NET 6+), including ASP.NET MVC, Core, and Web API development.
• Hands-on experience with microservices, containerization, Kubernetes, and Helm for orchestration.
• Deep knowledge of Angular 15+ with ability to build new components and optimize existing ones in a monorepo using RXJS and pipeline operators.
• Skilled in JavaScript, TypeScript, DOM manipulation, CSS/SASS, and UI styling per design specifications.
• Experience using Git and SVN with workflows involving branching, merging, and rebasing.
• Strong unit testing background including NUnit, mocking frameworks, and API testing with Postman.
• English proficiency at Upper-Intermediate level or above, both spoken and written.

What to expect from us: 

• Growth & Development: Clear career paths, mentorship opportunities, and access to continuous learning to help you reach your full potential.
• Flexibility & Well-Being: We provide flexible work arrangements and initiatives that empower you to manage your schedule effectively, stay productive, and thrive both personally and professionally.
• Recognition & Impact: A culture that celebrates achievements, values your ideas, and empowers you to make real contributions from day one.
• Innovative Culture: Be part of a company that embraces new ideas, modern technologies, and bold thinking to stay ahead of the curve.
• Benefits & Rewards Package: We provide competitive compensation and benefits designed to support you and your family. Our rewards approach goes beyond salary, recognizing your contributions and commitment. The exact package may vary depending on your country of residence and employment type. 

About project:
Our Customer is one of the biggest companies on the market of home entertainment consumer electronics devices that strives to provide their clients with high-quality products and services.

Project goals include automation testing of the video and audio content and other services available via digital media players using a custom test automation framework.

Responsibilities:

• Working with the solid automation test framework and infrastructure.
• Developing new and updating existing automation scripts.
• Code review.
• Debugging issues and creating bug reports.
• Documentation creation.
• Communication with international teams (US, UK).

• Manual work: about 20%.

  
  Requirements:

• Strong hands-on experience in Python development.
• Experience developing, maintaining, and extending automated test frameworks and test suites.
• Good knowledge of QA methodologies, test design techniques, and software testing lifecycle.
• Understanding of test automation design patterns, including Page Object Model (POM).
• Experience with Scrum/Agile;
• Good communication and problem-solving skills;
• Excellent written and verbal English communication skills, developed interpersonal skills;
• Highly motivated, energetic, and able to easily switch between assignments. 
   

About Our Client:

Our client is a leading enterprise data platform company building an open, high-performance data lakehouse for AI and analytical workloads. The platform combines an intelligent SQL query engine, an AI-ready semantic layer, and an open catalog built on Apache Iceberg — enabling Fortune 500 companies across finance, energy, manufacturing, and logistics to unify, query, and govern data at massive scale across cloud and on-premise sources.

About the Role:

We are looking for a Middle-level Software Engineer to work on the core query engine of a large-scale distributed data platform. You will develop features across query planning, optimization, and execution, contribute to performance-critical components, and help investigate and fix production issues reported by real enterprise customers.

This is a systems-level, backend engineering role focused on distributed data processing internals — not application development or CRUD services.

Responsibilities:

• Develop and maintain features across the query engine — planning, optimization, execution, and data access layers
• Write performance-conscious code in Java and/or C++
• Investigate and fix production and customer-reported issues under the guidance of senior engineers, including fixes delivered across multiple supported release lines
• Work with SQL semantics, query plans, and execution operators over large-scale distributed data
• Integrate with columnar formats, open table formats, and connectivity drivers
• Contribute to CI/CD and automated testing in Jenkins
• Deploy and validate changes on Kubernetes (GKE/EKS/AKS) across GCP, AWS, or Azure with Docker
• Debug issues across query planning, distributed execution, memory management, and I/O; collaborate with US-based teams on design and code reviews.

Required Qualifications:

• B.S. or M.S. in Computer Science, Computer Engineering, or a related field
• 3+ years in backend / systems software engineering
• Strong proficiency in Java or C++ with solid OOP and software design fundamentals, including concurrency and asynchronous programming (comfort with both languages is especially valued)
• Strong SQL and understanding of relational and analytical data systems, including query execution concepts
• Hands-on experience with data processing systems: query engines, distributed databases, ETL/ELT, or analytical platforms
• Experience with Jenkins pipelines and modern development workflows
• Docker and basic Kubernetes (running workloads, debugging pods, kubectl fluency)
• Hands-on experience with at least one major cloud (GCP, AWS, or Azure)
• Confident Git/GitHub workflows
• Comfortable with AI-assisted development workflows — using modern AI tools for code comprehension, debugging, and test generation, and critically validating their output
• English Upper-Intermediate or higher (B2+) — daily written and verbal communication with a US-based engineering team
• Availability to work EU business hours shifted 2–3 hours later for daily overlap with US West Coast mornings.

Desired Skills:

• Apache Arrow (columnar in-memory format) and SQL planner/optimizer frameworks such as Apache Calcite
• LLVM-based runtime expression compilation
• Open table formats — Apache Iceberg, Delta Lake, or Hudi — and columnar file formats such as Parquet, Avro, or ORC
• MPP query engines (Presto, Trino, or similar); exposure to distributed data platforms such as Spark, Snowflake, or Databricks
• Messaging systems: Kafka, NATS, or cloud pub/sub services
• Query planning, optimization, and execution internals
• Connectivity drivers: JDBC, ODBC, Arrow Flight
• Managed Kubernetes (GKE/EKS/AKS), multi-cloud exposure; Terraform
• Performance profiling of latency-sensitive systems.

Details:

• Engagement: Long-term contract
• Location: Europe (EU / EEA / UK), remote
• Working hours: EU business hours, shifted 2–3 hours later for daily overlap with the US West Coast team

MINT is the leader in Advertising Resource Management (ARM) software, driving marketing transformation in the age of agentic AI. At the core of our innovation is an open enterprise platform that deploys autonomous AI agents to augment human teams across the marketing and advertising value chain, connecting marketing performance with enterprise growth and real business impact.

Thanks to a diverse team of over 300 professionals worldwide, we integrate technology, data, and agentic intelligence to redefine how global brands and agencies plan, execute, and optimize their advertising investments.

With the recent acquisitions of technology leaders Redmill Solutions and info³, MINT has further expanded its unified ecosystem, completing the long-awaited connection of media planning, buying, and execution within one intelligent environment.

Augmenting Advertising Intelligence. For more information, visit mint.ai.

The Role

We are looking for a skilled API Developer to collaborate with us on a consultancy basis.

In this role, you will craft and maintain the backbone of software interactions.

This is a consultancy engagement, not an employment contract. The selected consultant will work independently, bringing their specialized knowledge and experience to our projects.

Responsibilities

• Development of components and applications in Python / FastAPI / Django;
• Maintenance of existing applications;
• Tasks estimation;
• Writing unit tests;
• Writing technical documentation and reports;

This role will be a great fit if you have:

• 3+ years of experience with Python;
• Experience with Django;
• Experience with FastAPI;
• Experience with AsyncIO;
• Experience with Celery;
• Knowledge of Kafka;
• Knowledge of SQL and NoSQL databases;
• Knowledge of Docker;
• Understanding of the HTTP protocol and RESTful APIs;
• Command of Linux/UNIX environment (shell, scripting, tools);
• Passione for Testing (Unit and Integration Testing);
• Good English proficiency

Ideally, you'll also have:

• Experience with the DDD approach and Hexagonal Architecture;
• Experience with microservices;
• Experience with integrating third-party services;
• Knowledge of Go/Scala/JS

Interview Process

Candidates can expect the following steps in our interview process:

• HR Video Interview (30 minutes): A virtual interview with HR to provide an overview of the company and the role, as well as to gain insight into your experience and background.
• Technical Interview with Tech team (1 hour): A virtual interview with the API Developer Team Lead and/or other Team members, focused on your technical expertise, past experience, and problem-solving approach.
• Offer: after completing the interview process, successful candidates will receive an offer.

Typical base salary pay range:

MINT is committed to a diverse and inclusive workplace. MINT AI is an equal opportunity employer and does not discriminate on the basis of age, race, religion, color, national origin, gender, gender identity, gender expression, sexual orientation, immigration status, medical condition, protected veteran status, disability, genetic information, political views or activity, or other legally protected status.

Senior Java Engineer (high-load product) 

Are you a Java Developer looking for new challenges? 
What about working with a high-profile client with millions of QPS? 
If you have experience developing high-performance distributed systems, this is the perfect opportunity to work on a new digital marketing management platform with a world-renowned client.
 
Project tech stack: 
Concurrency -  a high-load, low-latency system.
Cache: Aerospike, Memcached
Cloud: AWS, GCP
DB: PostgreSQL, Superset
Streams: Kafka, Kinesis
Data formats: Avro, Protobuf
Languages: Java, Scala, Python
 
About the project:
Our client is a leading streaming service based in the United States. With millions of users worldwide, its devices provide easy access to free TV, live news, sports, movies, etc. The client has an advertising business and also licenses its hardware and software to other companies.
 
Location:
Ukraine remote
 
Skills & Experience:
- 4 - 8 years of experience building large-scale and low-latency distributed systems
- B.S. or M.S. degree in Computer Science, Engineering, or equivalent 
- Command of Java or C++
- Solid understanding of algorithms, data structures, performance optimization techniques, object-oriented programming, multi-threading, and real-time programming 
-Self-motivated individual with a high level of accountability and ownership
- Critical thinking and practical decision making
- Can do, results-oriented mindset
 
Will be a plus: 
- Experience with distributed caching, SQL/NoSQL, and other databases is a plus 
- Experience with Big Data and cloud services such as AWS/GCP is a plus
Experience in the advertising domain is a big plus 

 Responsibilities
- Work alongside a highly skilled engineering team to design, develop, and maintain large-scale, highly performing, real-time applications
- Own building features, driving directly with product and other engineering teams 
- Demonstrate excellent communication skills in working with technical and non-technical audiences 
- Be an evangelist for best practices across all functions – developers, QA, and infrastructure/ops 
- Be an evangelist for platform innovation and reuse 
- Deliver top-quality software in a timely fashion 

 

About the Client

Our client is a Norwegian digital agency working with high-end customers, including clients in the Norwegian public sector.

The company positions itself as a high-quality technology partner, and its customers expect a high standard of technical delivery. As a result, the team is looking for experienced developers who can work independently, understand complex client needs, and contribute beyond pure implementation.

The company is ISO 27001 and ISO 9001 certified and works on projects where information security, quality, and compliance are important.

About the Role

We are looking for a Senior PHP Developer, ideally with experience in Craft CMS, to join the client’s development team.

The developer will primarily join existing customer projects, so the ability to quickly understand an established codebase, architecture, and business context is essential.

The client currently works with approximately 50 active customers, and projects can involve sophisticated CMS solutions, e-commerce functionality, and integrations with external systems such as payment and shipping providers.

Craft CMS experience is highly relevant, but the client is also open to strong CMS developers who can learn Craft quickly. The underlying technical experience, maturity, and ability to work with complex web solutions are more important than experience with one particular CMS.

Responsibilities

• Develop and maintain PHP-based web applications and CMS solutions.
• Work with and extend existing Craft CMS projects.
• Quickly onboard onto established client projects and existing codebases.
• Develop new functionality and maintain existing solutions.
• Build and maintain integrations with third-party systems.
• Work with payment, shipping, and other external service providers.
• Contribute to e-commerce projects, including Craft Commerce where relevant.
• Understand business requirements and translate them into practical technical solutions.
• Consider solutions not only from a developer perspective, but also from the perspective of editors and end users.
• Collaborate closely with the client’s internal team and contribute ideas proactively.

• Maintain a high standard of quality appropriate for demanding enterprise and public-sector customers.

   

Requirements

• Strong professional experience with PHP.
• Senior-level software development experience, or a very strong mid-level profile.
• Experience working with a CMS in production environments.
• Experience with Craft CMS is highly preferred.
• Ability to work effectively with existing and potentially complex codebases.
• Strong understanding of modern web development principles.
• Experience working with APIs and third-party integrations.
• Experience with complex customer-facing web solutions.
• Ability to work independently and take ownership of tasks.
• Strong problem-solving skills.
• Ability to think creatively and challenge assumptions when needed.
• Strong understanding of user and editor needs, not only technical requirements.

• Good communication skills and professional English.

   

Nice to Have

• Craft Commerce experience.
• E-commerce development experience.
• Experience integrating payment providers.
• Experience integrating shipping or logistics providers.
• Experience with React.
• Experience with Angular.
• Previous experience working with high-end digital agency projects.

• Experience working with public-sector or security-sensitive customers.

   

What the Client Values

The client is specifically looking for someone who is more than just a strong coder.

They value developers who:

• think outside the box;
• are proactive rather than waiting for detailed instructions;
• understand the business and user perspective;
• can work independently;
• are comfortable entering an existing project and quickly becoming productive;

• can suggest better solutions instead of simply implementing requirements literally.

   

Location and Working Setup

The role is remote.

For a significant part of the client’s customer portfolio, particularly Norwegian public-sector projects, developers may be required to be located within the EU or Schengen area.

Candidates outside the EU/Schengen area may still be considered for projects where this restriction does not apply, depending on the specific customer and security requirements.

Working hours: EU business hours
Language of communication: English

Engagement and Benefits

Contract type: B2B
Monthly compensation: €2,000–€3,500
Paid vacation: 25 working days per year
Paid sick leave: Covered
Public holidays: Covered
Salary review: Once per year
Engagement: Full-time, long-term cooperation

The developer will work closely with the Norwegian client team and will be integrated into their day-to-day development processes.

About the role

Are you ready to take your Java expertise to the next level? Join our team to work with a highly scalable, highly available, real-time advertising platform that serves millions of users worldwide and handles massive real-time data at scale. We are hiring a Software Engineer to be a vital part of this mission. If you bring extensive experience building complex systems, love great technology at scale, jumping in, and figuring things out in any system, this role is for you! Working in a modern, cloud-native environment, you’ll collaborate with a team of top engineers to develop low-latency, distributed systems capable of handling millions of QPS. This is an opportunity to combine innovation, performance engineering, and large-scale impact - while shaping the future of digital entertainment technology.
 

About the project

Our client is a leading streaming service based in the United States. With millions of users worldwide, its devices provide easy access to free TV, live news, sports, movies, etc. The client has an advertising business and also licenses its hardware and software to other companies.
 

Who are we looking for?

Skills & Experience

• 4+ years of experience building large scale and low latency distributed systems
• 5+ years of Java backend development experience;
• Solid understanding of algorithms, data structures, performance optimization techniques, object-oriented programming, multi-threading, and real-time programming 
• Experience with distributed caching, SQL/NO SQL, and other databases is a plus 
• Experience with Big Data and cloud services such as AWS/GCP is a plus
• Experience in advertising domain a big plus 
• Self-motivated individual with a high level of accountability and ownership
• Critical thinking and practical decision making
• Can do, results-oriented mindset
• Software development best practices: test-driven development, automated testing;
• Knowledge of distributed systems architecture and service oriented systems;

• English: B2+

   

Nice to have

• Familiarity with machine learning frameworks (e.g., TensorFlow, PyTorch) and working with large language models (LLMs)

   

Responsibilities

• Develop and maintain complex backend services
• Collaborate with cross-functional teams (Product, Design, QA) to deliver high-quality features;
• Write unit, integration, and end-to-end tests;
• Maintain and extend existing services to meet new requirements;
• Participate in code reviews and contribute to technical discussions;
• Help maintain technical documentation;
• Assist in improving CI/CD pipelines;
• Contribute to best practices within the development team.

ZentixSoft is looking for Full-Stack Developers! 🔥
 

Format: Full-Time Outstaffing, long-term project (12+ months).
 

💡 Why ZentixSoft? 
💸 Salary Review: A structured system of compensation reviews aligned with your engineering growth. 
⚖️ Work-Life Balance: Sustainable workflows with no senseless overtime, helping you keep your resource fully charged. 
🦾 Trust and Transparency: Zero micromanagement and no invasive time-trackers—we fully trust your professional autonomy.
 🎁 Gifts & Culture: Corporate gifts for holidays, birthdays, and a true team atmosphere where your voice always matters.
 

Our Perfect Match: 
1️⃣ Full-Stack Stack: Strong proficiency in Java Spring Boot on the backend and React / Next.js on the frontend. 
2️⃣ Architecture: Understanding and practical experience with Modular Monolith Architecture. 
3️⃣ Technologies: Experience working with MySQL, Redis, and ActiveMQ. 
4️⃣ Infrastructure: Basic or practical understanding of containerization and Kubernetes. 
5️⃣ Communication: Confident English skills (B1+) for daily team syncs.
 

Project Details: 
⏳ Duration: 12+ months (Full-time).
 🚀 Start: In 1 month.

Description:

We’re a part of the team that has been developing software to help construction companies streamline their operations. Today, our product is recognized as a pioneer and leader in the market, serving thousands of construction companies across the nation. Year after year, they continue to innovate, refine, and expand their products as the industry evolves. Now we build a cloud platform for planning and optimising resources for the construction, industry, and energy sectors.

We develop software that helps our clients manage every stage of construction from pre-construction through construction to its final support.

Requirements:

• Senior Individual Contributor with 5+ years of software engineering experience.
• Primary Scope: Architecting, building, and maintaining backend systems using Go and PHP, deployed on AWS.
• Database: Strong proficiency in MySQL schema design, complex query optimization, and performance tuning.
• Hands-on experience deploying and managing backend services on AWS
• English: Professional working proficiency (required for clear technical documentation and team syncs).

• Collaboration: Self-driven with strong communication skills and experience operating in agile/scrum environments.

   

Nice-to-Have:

• Experience with Terraform for automated provisioning.
• Working knowledge of React to support full-stack tasks when required.
• French: Conversational or professional working proficiency (strongly preferred for smoother integration with the France-based team).

Job responsibilities:

• Design, develop, and maintain high-performance backend microservices and web applications.
• Collaborate daily with a France-based product and engineering team to estimate and plan the implementation of large features.
• Create new or build upon existing features that solve complex customer problems.

We are looking for a Tech Lead/Senior Backend Engineer on behalf of our client, an innovative technology company operating at the intersection of financial technology, AI, and digital asset infrastructure.
This is an opportunity to join a highly skilled engineering team working on complex backend systems where scalability, reliability, and data integrity are critical. The role is best suited for engineers who enjoy solving challenging technical problems, taking ownership of their work, and contributing directly to the development of core platform functionality.

Responsibilities
Design, develop, and maintain backend services using Node.js and TypeScript.
Build and enhance APIs, data models, and core platform components.
Work with MongoDB, Redis, and AWS cloud services.
Design, build, and maintain high-load backend systems capable of handling large-scale traffic and ensuring high availability.
Participate in the setup, configuration, and ongoing support of cloud infrastructure to ensure reliability, scalability, and operational efficiency.
Contribute to improving deployment processes, monitoring, logging, and alerting for backend services and production environments.
Troubleshoot and resolve production issues while ensuring system stability and performance.
Optimize applications for scalability, reliability, and maintainability.
Participate in technical discussions and contribute to architectural decisions around backend services, infrastructure, and platform scalability.

Requirements
Degree in Computer Science, Mathematics, or a related technical field.
7+ years of commercial backend development experience.
Strong expertise in Node.js and TypeScript.
Hands-on experience with MongoDB and Redis.
Proven track record of building and supporting high-load production systems.
Solid understanding of backend architecture, API design, and scalable system design principles.
Hands-on experience with infrastructure setup, configuration, and support in cloud environments.
Experience contributing to architectural decisions for scalable and reliable backend systems.
Strong debugging, troubleshooting, and problem-solving skills.
Ability to work independently in a fast-paced environment.

Nice to Have
Experience with distributed systems and event-driven architectures.
Familiarity with messaging systems and asynchronous workflows.
Previous experience in fintech, trading platforms, marketplaces, or other high-load systems.
Startup or scale-up environment experience.
Experience with CI/CD pipelines, containerization, or infrastructure automation tools
Experience in competitive programming or participation in programming olympiads

We Value
Strong ownership mentality.
Attention to detail and focus on system reliability.
Ability to identify edge cases and design robust solutions.
Practical engineering mindset with a hands-on approach to development.
Excellent communication and collaboration skills.

Adaptiq, on behalf of AppsFlyer, is looking for a Backend Engineer(Data Oriented)

🌍 About AppsFlyer:

AppsFlyer provides a SaaS marketing analytics platform that measures and optimizes marketing activities across mobile, web, CTV, PC, and console applications. AppsFlyer is known for its massive backend production. At any given moment, thousands of servers are consuming 150+ billion mobile app events, crunching our users’ data, serving requests, and communicating on a massive scale.

The Analytics group is responsible for showing our clients the stories their data is telling. Through complex aggregation, mission-tailored analytical databases, and carefully crafted APIs, we are able to provide slice-and-dice analysis in our beautiful dashboards and through the use of external integrations.

🧩 About the Role:

As a Data-Oriented Backend Engineer  within the Analytics group at AppsFlyer, you will own the end-to-end journey of event data - from ingestion and processing to storage, modeling, and API delivery. 

You will design and implement end-to-end features - from streaming and batch data processing to database modeling and API development, design and implement data pipelines, choose and optimize analytical databases, and integrate new components in our hybrid microservices environment while collaborating closely with product managers and cross-functional engineering teams. 

📈 Key Responsibilities:

• Implement end-to-end backend and data infrastructure features, including streaming and batch pipelines, storage selection, and schema modeling.
• Collaborate with product managers and cross-functional teams to define, prioritize, and deliver complex analytics services.
• Design and optimize high-throughput, low-latency distributed systems to meet performance and scalability targets.
• Develop and maintain microservices-based APIs that serve real-time customer requests.
• Build and operate data ingestion and processing workflows using modern orchestration frameworks.
• Perform root cause analysis on production incidents, drive resolutions, and participate in on-call rotations.
• Enhance self-serve CI/CD pipelines and improve observability tooling to increase delivery velocity and system reliability.
• Share expertise through internal or external talks, blog posts, and contributions to open-source projects.

💻 Required Competence and Skills:

• Minimum 3 years of software development experience, with a focus on backend engineering with any of the programming languages(C#, C++, Go, Scala, Java)
• Experience building backend services, APIs and distributed systems.
• Experience working with large-scale production databases in high-load environments(e.g. ClickHouse, BigQuery, Redshift, Druid, MongoDB, Elasticsearch, DynamoDB)
• Experience designing or maintaining data pipelines or production data workflows.
• Ability to solve production issues involving performance, scalability or data quality.
• Understanding of different data processing architectures (batch, streaming, etc.) and their trade-offs.
• Experience working with public cloud platforms (e.g., AWS, GCP, Azure).
• Strong English communication skills.
• B.Sc. in Computer Science or equivalent.

➕ Nice to Have:

• Experience with workflow orchestration frameworks such as Airflow.
• Familiarity with large-scale production ETL pipelines.
• Prior work with production Go backend services; knowledge of Clojure is a plus.
• Exposure to BigQuery at production scale.
• An “AI mindset”: familiarity with developer productivity tools like GitHub Copilot or Cursor.

🚀 Benefits Package includes:

• Health Insurance
• Paid Unlimited Vacation Days + all national holidays + additional recharge days
• Meals Reimbursement
• Sport Reimbursement
• Breakfast in the office
• Mental health program
• Team building, happy hours, and other team activities
• Paid sick days
• Snacks, fruits & ice-cold beer
• All new team members are provided with a brand-new Mac laptop with 2 monitors and a Starter package