Jobs Backend

About the project:

We’re looking for two Back-End Developers (Middle+ / Senior level) to join our team on a project for a Dutch bookkeeping platform. The product is modernizing its accounting core: replacing legacy single-entry accounting logic with a database-backed double-entry model, improving ledger-code management, and introducing reliable reconciliation capabilities.

All changes are implemented within the existing Java/Spring application, with a strong focus on production stability, preserving historical accounting data, and safe migration to the new model. The current platform must keep running without disruption. This is a full-time engagement for approximately 6 months.
Start & timeline:

We’re hiring in advance. The project is currently in Phase 2, and the role starts with Phase 3, expected in early January 2027 (exact date TBC). We’ll keep you updated throughout the hiring process.

Your team:

You’ll join an established Techstack engineering team and work closely with the client’s internal developers and technical stakeholders. The team includes a Project Manager, Lead Software Engineer, QA Engineer, Senior Full-Stack Developer, and 2 Back-End Developers (these positions), plus the client’s Solution Architect and CTO. We work through daily stand-ups, sprint reports, regular code reviews, and close collaboration with the client’s engineering team.

Culture:

We uphold high standards in the tech industry and continuously evolve to meet them. Every team member can influence the product, the company, internal processes, and their own professional growth. We also regularly organize team-building activities to keep a friendly atmosphere and simply enjoy time together.

Technical stack:

• Backend: Java, Spring, Hibernate (monolith), JPA, Redis
• Database: MariaDB, PostgreSQL, Flyway migrations
• Testing & quality: JUnit 5, WireMock, API/Cucumber tests, CI, SonarCloud
• Hosting & deployment: Linux, WAR deployment, Docker (local/CI), AWS S3
• Integrations: third-party payroll and banking APIs, tax authority APIs, OpenAI, Mailgun
• Delivery practices: feature flags, regular releases, roll-forward fixes
• Frontend (awareness only): React, MobX, TypeScript, JavaScript
• Tools: Jira, Confluence, Miro, Slack, Figma

Your responsibilities:

• Develop back-end functionality within the existing Java/Spring monolith: APIs, business logic, and data models
• Design and modify database schemas; implement safe schema and data migrations
• Implement accounting logic with strong data-integrity requirements: balanced entries, auditability, and no data loss
• Develop role-based access controls for new functionality
• Build and maintain reconciliation and validation tools to compare the new accounting logic with existing system behavior
• Write unit and integration tests and keep regression suites green
• Support production releases: CI pipelines, feature flags, deployments, and post-release monitoring
• Investigate application logs and help troubleshoot deployment and production issues
• Work closely with the Tech Lead, back-end and front-end developers, QA, PM, and the client’s engineering team
• Participate in code reviews and maintain technical documentation

It’s about you:

• Solid commercial experience with Java
• Hands-on production experience with Spring and Hibernate
• Strong SQL skills and relational database design, preferably MariaDB or MySQL
• Experience with schema and data migrations using Flyway or similar tools
• Good understanding of transactions, database constraints, data integrity, and idempotent operations
• Experience writing unit and integration tests (JUnit 5, WireMock, or similar)
• Experience maintaining and extending large existing codebases without breaking functionality
• Familiarity with feature flags, small focused PRs, and CI pipelines
• Comfortable working with Linux, application logs, and supporting production releases; hands-on experience with deployments, troubleshooting, and post-release monitoring is highly valued
• Ability to follow established architecture standards and collaborate through code reviews with the client’s developers
• Good spoken and written English for daily communication with the client
• Time zone: Europe/Kyiv or compatible with CET/CEST working hours

Would be a plus:

• Experience in accounting, bookkeeping, or FinTech projects
• Experience with dual-write, reconciliation, or data verification during migrations and data model changes

What we can offer you:

• Full-time engagement (40h/week) on a product with a complex, high-integrity domain
• Direct communication with all stakeholders, including the client’s engineering team
• Broad opportunities for professional and career growth: challenges, meetups, hackathons, professional communities, and more
• Horizontal connections and no micromanagement: all team members are accessible to each other for any questions
• Hubs in Kharkiv, Kyiv, Lviv, and Wrocław (Poland), or everything necessary for remote work
• Up to 50% compensation for educational courses and conferences
• Free English and business English courses
• 20 days off and 7 sick days
• Legal and accounting support
• Appreciation gifts for significant events and occasions

How to join Techstack:

1. Pre-screening with a Talent Acquisition Specialist
2. English check
3. Technical screening and evaluation with Techstack engineers
4. Candidate profile submission to the client

Back-End Enginner (Java/Spring, Release & Operations Support) 

Start & timeline:

We’re hiring in advance. The project is currently in Phase 2, and the role starts with Phase 3, expected in early January 2027 (exact date TBC). We’ll keep you updated throughout the hiring process.

About the project:

We’re looking for two Java Engineers (Middle+ / Senior level) to join our team on a project for a Dutch bookkeeping platform. The product is modernizing its accounting core: replacing legacy single-entry accounting logic with a database-backed double-entry model, improving ledger-code management, and introducing reliable reconciliation capabilities.

All changes are implemented within the existing Java/Spring application, with a strong focus on production stability, preserving historical accounting data, and safe migration to the new model. The current platform must keep running without disruption. This is a full-time engagement for approximately 19–23 weeks (Phases 3–4).

Your team:

You’ll join an established Techstack engineering team and work closely with the client’s internal developers and technical stakeholders. The team includes a Project Manager, Lead Software Engineer, QA Engineer, Senior Full-Stack Developer, and 2 Back-End Developers (these positions), plus the client’s Solution Architect and CTO. We work through daily stand-ups, sprint reports, regular code reviews, and close collaboration with the client’s engineering team.

Culture:

We uphold high standards in the tech industry and continuously evolve to meet them. Every team member can influence the product, the company, internal processes, and their own professional growth. We also regularly organize team-building activities to keep a friendly atmosphere and simply enjoy time together.

Technical stack:

• Backend: Java, Spring, Hibernate (monolith), JPA, Redis
• Database: MariaDB, PostgreSQL, Flyway migrations
• Testing & quality: JUnit 5, WireMock, API/Cucumber tests, CI, SonarCloud
• Hosting & deployment: Linux, WAR deployment, Docker (local/CI), AWS S3
• Integrations: third-party payroll and banking APIs, tax authority APIs, OpenAI, Mailgun
• Delivery practices: feature flags, regular releases, roll-forward fixes
• Frontend (awareness only): React, MobX, TypeScript, JavaScript
• Tools: Jira, Confluence, Miro, Slack, Figma

Your responsibilities:

• Develop back-end functionality within the existing Java/Spring monolith: APIs, business logic, and data models
• Design and modify database schemas; implement safe schema and data migrations
• Implement accounting logic with strong data-integrity requirements: balanced entries, auditability, and no data loss
• Develop role-based access controls for new functionality
• Build and maintain reconciliation and validation tools to compare the new accounting logic with existing system behavior
• Write unit and integration tests and keep regression suites green
• Support production releases: CI pipelines, feature flags, deployments, and post-release monitoring
• Investigate application logs and help troubleshoot deployment and production issues
• Work closely with the Tech Lead, back-end and front-end developers, QA, PM, and the client’s engineering team
• Participate in code reviews and maintain technical documentation

It’s about you:

• Solid commercial experience with Java
• Hands-on production experience with Spring and Hibernate
• Strong SQL skills and relational database design, preferably MariaDB or MySQL
• Experience with schema and data migrations using Flyway or similar tools
• Good understanding of transactions, database constraints, data integrity, and idempotent operations
• Experience writing unit and integration tests (JUnit 5, WireMock, or similar)
• Experience maintaining and extending large existing codebases without breaking functionality
• Familiarity with feature flags, small focused PRs, and CI pipelines
• Comfortable working with Linux, application logs, and supporting production releases; hands-on experience with deployments, troubleshooting, and post-release monitoring is highly valued
• Ability to follow established architecture standards and collaborate through code reviews with the client’s developers
• Good spoken and written English for daily communication with the client
• Time zone: Europe/Kyiv or compatible with CET/CEST working hours

Would be a plus:

• Experience in accounting, bookkeeping, or FinTech projects
• Experience with dual-write, reconciliation, or data verification during migrations and data model changes

What we can offer you:

• Full-time engagement (40h/week) on a product with a complex, high-integrity domain
• Direct communication with all stakeholders, including the client’s engineering team
• Broad opportunities for professional and career growth: challenges, meetups, hackathons, professional communities, and more
• Horizontal connections and no micromanagement: all team members are accessible to each other for any questions
• Hubs in Kharkiv, Kyiv, Lviv, and Wrocław (Poland), or everything necessary for remote work
• Up to 50% compensation for educational courses and conferences
• Free English and business English courses
• 20 days off and 7 sick days
• Legal and accounting support
• Appreciation gifts for significant events and occasions

How to join Techstack:

1. Pre-screening with a Talent Acquisition Specialist
2. English check
3. Technical screening and evaluation with Techstack engineers
4. Candidate profile submission to the client

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

Our client is in the process of solving one of the biggest pain points for B2B service providers: getting paid on time by providing an effortless, first-of-its-kind automated platform. In a $74B market and backed by renowned investors, frees businesses from manual work hassle and high operational costs, allowing employees and managers to focus their time on growing their businesses instead. As we enter our hyper-growth stage, this is a rare opportunity to join an amazing team that is on its way to revolutionizing B2B payments.

We're on the lookout for an exceptional Backend Engineer to join our team and become a key player in shaping the future of our products and company. This is your chance to be a significant building block at this thrilling and pivotal moment before we soar to even greater heights.

Key Requirements:
🔹 Working hours: 12:00 PM to 9:00 PM (Ukrainian time)
🔹 An experienced Backend Engineer with a minimum of 4 years in the field
🔹 Hands-on proficiency in Go — must have;
🔹 Hands-on proficiency in TypeScript — strong advantage;
🔹 Experience in system architecture and design - a plus
🔹 Experience with processes such as TDD / Extreme Programming / Kanban - a big plus.
🔹 Experience with GCP, AWS, or other cloud providers - a plus
🔹 Familiarity with database systems (e.g., PostgreSQL)- a big plus.
🔹 Experience in designing, prioritizing and leading software projects - a plus
🔹 Can juggle at least three flaming chainsaws while riding a unicycle
🔹 B.Sc. in Computer Science (or equivalent).
🔹 English – Upper-Intermediate or higher.

Will be plus:
🔹 Experience working in a startup company.

What you will do:
🔹 Scope, design, and implement high-performance APIs and services
🔹 Collaborate with engineers and product managers to deliver robust solutions in short development iterations
🔹 Develop maintainable and clean code with heavy reliance on developer testing
🔹 Make thoughtful trade-offs based on business priorities, user needs, and a sustainable technical foundation;

Interview stages:
🔹 HR interview;
🔹 Technical Interview
🔹 Design Interview / Design Task
🔹 Final Interview (Optional)
🔹 Reference Check;
🔹 Offer;
 

About the role

We are looking for a Golang Backend Engineer to join a company and contribute to the development of a modern, scalable software product.

You will be responsible for building and maintaining backend services, designing APIs, and working with cloud infrastructure. The role involves developing reliable, high-performance systems and contributing to technical architecture and engineering decisions.

Responsibilities:

• Design, develop, and maintain backend services using Golang.
• Build and integrate RESTful APIs and third-party services.
• Develop scalable and high-performance backend solutions.
• Work with cloud infrastructure and containerized applications.
• Contribute to system architecture and performance optimization.
• Work with Kubernetes and Helm for application deployment and management.
• Participate in CI/CD processes and improve development workflows.
• Collaborate with the team to deliver reliable and maintainable software.

Requirements:

• Strong commercial experience with Golang.
• Solid understanding of backend development principles and software architecture.
• Experience designing and developing RESTful APIs.
• Hands-on experience with at least one cloud platform: AWS, GCP, or Azure.
• Experience with Kubernetes and Helm.
• Understanding of CI/CD pipelines and deployment processes.
• Good knowledge of databases, data structures, and software development best practices.

Nice to have:

• Experience with Python.
• Familiarity with React.js or Vue.js.
• Experience with AI-powered solutions and data processing.
• Knowledge of microservices and distributed systems architecture.

If you enjoy building scalable backend systems, solving complex engineering challenges, and working with modern technologies, we'd love to hear from you!

Our Client is a leading VC-backed defense technology company founded to bridge the decades-old gap between modern technology and critical national security requirements.

Today, we are building the necessary infrastructure to bring together sensors, autonomy, and operators with our technologies deployed in active operations around the world.

About this position

We are seeking a Senior Software Engineer to join our Legion Platform team. You will design, build, and deploy high-performance, scalable server systems and integration tools that connect hardware and software systems across environments and levels of command. 

As part of the Legion team, your expertise will be critical to solving complex system challenges and developing a robust platform that is deployed for real-world military missions. 

This role requires continuous innovation and is a good fit for an engineer who thrives under pressure and demands that their work have an immediate, tangible impact on national security.

Ajax Systems, an international tech company and the largest manufacturer of security systems in Europe.
We are looking for a new team member to join our System devisions as Java Developer.

The System Division is responsible for building and developing the Ajax software ecosystem. The team develops and maintains OS Malevich and the Video Management System, builds scalable cloud infrastructure, and creates client applications for multiple platforms, ensuring that all system components work together as a unified ecosystem.

The division works with Java, Kotlin, Swift, C, C++, and Python. It includes embedded, cloud, mobile, and desktop engineers who ensure the stable operation of Ajax as a single digital platform.


Required skills:

• 5+ years of commercial experience in backend development with Java in an enterprise environment.
• Strong understanding of Java Concurrency and hands-on experience with concurrent programming in production systems.
• Solid understanding of SOA, microservices and event-driven architecture.
• Practical experience with cloud computing platforms.
• Experience building and supporting high-load, scalable and highly available systems;
• Hands-on experience with messaging brokers.
• Strong understanding of modern backend infrastructure, NoSQL, key-value databases and in-memory storage solutions.
• Practical experience with Kubernetes.
• Experience with Git, Gradle or othet CI/CD tools.
• Strong knowledge of unit testing and automated testing approaches

Would be a plus:

• experience with these technologies: Redis, Netty, Akka, NATS, AWS, Kafka, MongoDB, gRPC.
• Practical experience with Kotlin.
• Desire to grow into a team leadership role.
   

What you will do:

• design and develop core backend services and data pipelines for the product line.
• Build clean, maintainable, and production-ready code with a strong focus on quality.
• Contribute to backend architecture, drive technical decisions and document solutions for reliable deployment and operations.
• Ensure proper test coverage with unit and integration tests.
• Take ownership of performance, scalability and cost efficiency within your domain.
• Maintain production reliability through monitoring, alerting, dashboards, and runbooks.
• Investigate and resolve production issues, including deep-dive analysis of complex cases.
• Work in a strong engineering culture with testing, continuous delivery and DevOps practices.
• Collaborate closely with product and engineering teams to deliver new features and improve existing services.

We offer:

• The opportunity to suggest and implement your own ideas that directly influence the product and its mass production
• A place in a fast-growing company with a motivated and professional team
• Competitive salary
• Medical insurance
• English classes
• The opportunity to participate in Ajax’s internal beta-testing program for security systems
• Discounts from partner companies
• Discounts on Ajax products
   

Ajax Systems is a Ukrainian success story that has grown into a global product. Ajax devices are trusted by more than 4.5 million end users and 330,000 PRO users in over 180 countries. The company provides comprehensive solutions to protect residential and commercial properties of all sizes. Today, Ajax portfolio includes 280 devices for intrusion protection, video surveillance, fire safety, and comfort and automation.

📋 Role Overview

We’re looking for a Lead Python Engineer to join our team and support one of our US-based clients — a CRM and data intelligence platform for private-market investors.

You’ll run backend, data and AI as one function: lead a team of seven engineers who build the core platform, the data pipelines and the AI services, and set the technical direction for all three. You’ll report to the client’s VP of Engineering and work alongside the frontend, QA and DevOps leads. This is a hands-on leadership role — about half of your week will be technical work.

This is a full-time, long-term engagement with working hours of approximately 14:00–23:00 Kyiv time to overlap with U.S. Eastern business hours. Occasional out-of-hours incidents come with the role.

 

🧙‍♂️In this role, you will

• Lead a team of seven backend, data and AI engineers across several time zones and own their planning, growth and delivery.
• Merge backend and AI into one team with a single planning process, cross-train both sides, make AI delivery visible alongside everything else and grow an owner for each area.
• Write design docs, make architecture calls, take on the hardest problems and take the first page when backend or AI breaks in production.
• Own the backend platform architecture, database design and technology choices, pay down tech debt deliberately, and keep the platform reliable as customers and their data grow.
• Define the canonical company model — how companies are identified and related, including entity resolution and search — and make sure customers can trust where every piece of data comes from.
• Own enrichment pipelines and data partners for company, people and deal data, and catch quality gaps before customers do.
• Put evaluation and quality controls around AI features so models and prompts can change safely, and own their accuracy, speed and cost.
• Review tickets before they reach engineers, hold code review to a real standard and track defects per feature.
• Make the engineering call on backend and AI incidents, drive blameless postmortems and keep a short, ranked tech-debt register tied to the roadmap.
• Agree API contracts with frontend, shape scope with Product and explain the data layer clearly to customers and their security teams.

🎯You may be interested if

• You want to own the core of a product end to end — backend, data and AI.
• You are a hands-on leader who still enjoys building, not only managing.
• You make decisions, write them down and see them through — and can disagree with a proposal without stalling it.
• You’d rather build engineering practices that stick than inherit them, without slowing the team down.
• You enjoy working with messy, real-world data and making it trustworthy.
• You thrive in a remote work setup and appreciate autonomy in organizing your work.

👌 Role Requirements

• 8+ years of professional backend development experience with Python, including deep Django and PostgreSQL experience.
• Strong relational data modeling and a record of sound architecture and technology choices on multi-tenant SaaS.
• 2+ years leading teams of 7+ engineers, with a record of growing people into owners.
• Experience leading distributed teams across time zones, including engineers from engineering partners.
• Hands-on experience shipping LLM features to real users (retrieval, extraction or agent workflows) and measuring them with evaluation sets.
• Hands-on experience with entity resolution, record linkage or pipelines that reconcile conflicting data sources; clear understanding of data provenance.
• Experience owning production incidents and on-call in your area.
• Experience in a company with established engineering processes: you know which practices are worth keeping and can build them without slowing the team down.
• Experience using AI-powered development tools, particularly Claude Code or similar coding agents, as part of the development workflow.
• Clear communication: writing design docs and decisions for engineers, explaining trade-offs to product managers and walking customers and non-technical stakeholders through how the system works.
• Advanced English (C1) or higher, including confident spoken and written communication.

Nice to have:

• Familiarity with private equity, venture or company data from sources like PitchBook or Crunchbase.
• Experience building and running production systems on Azure.
• Experience building search that blends keyword and semantic retrieval across large datasets.
• Experience with event streaming or orchestration (Kafka, Airflow) and data quality tooling (Great Expectations, Monte Carlo).
• Experience with Python AI frameworks, agent tooling and the Model Context Protocol (MCP).
• Experience building email or calendar integrations at scale.

💻 Working Conditions

• Employment Type: Full-Time 
• This is a fully remote position with the entire team across Ukraine.
• Preferred working hours: approximately 14:00–23:00 (Kyiv time), aligned with U.S. Eastern business hours.
• 20 working days of paid vacation per year.
• Financial compensation for completing certifications and encouraging continuous learning and professional development.
• High-impact role with clear visibility — you’ll own the backend, data and AI layer of the product end to end.

Our Mission and Vision

At Solidgate, our mission is clear: to empower outstanding entrepreneurs to build exceptional internet companies. We exist to fuel the builders — the ones shaping the digital economy — with the financial infrastructure they deserve. To achieve that, we’re on a bold path: to become the #1 payments orchestration platform in the world.

We believe the future of payments is shaped by people who think big, take ownership, and bring curiosity and drive to everything they do. That’s exactly the kind of teammates we want on board.

Solidgate is part of Endeavor — a global community of the world’s most impactful entrepreneurs. We’re proud to be the first payment orchestrator from Europe to join — and to share our expertise within a network of outstanding global companies.

About the Team and Role

You’ll join the Core team — the team responsible for the services that sit at the heart of Solidgate’s payment processing. Core services define what a payment is, integrate with numerous internal services for correct routing, run antifraud checks, and process payments through providers, covering card payments as well as Apple Pay and Google Pay. This is the critical path for every payment on the platform, so the team’s work directly defines the reliability and speed of the whole system.

The team is actively growing new functionality, supporting existing services, working down technical debt, and maintaining an SLO of 99.99%+ across all of its services. The stack is built around high-load, low-latency requirements: a microservices architecture with Kotlin as the primary language, Protobuf RPC over Buf/Connect, PostgreSQL as the main database, and Kafka for asynchronous processing, with fully automated production deployments and an advanced monitoring and observability setup. Infrastructure is continuously improved by a dedicated platform team, with IaC ensuring transparent, reproducible, and scalable management.

Your team — Product Manager, Tech Lead (Backend), three Backend Software Engineers (Senior), one Frontend Software Engineer (Middle), AQA Engineer, and System Analyst.

What you’ll own

Your focus will be on:

• taking part in product decisions across the full development lifecycle
• designing and developing backend functionality for our products
• collaborating with other teams to build reliable solutions for payment processing
• improving the performance, scalability, quality, and reliability of our systems

You’ll grow from feature-level tasks toward owning a dedicated service or domain, taking part in the team’s design and technical decisions.

You’re a great fit if you have

• 3+ years of experience with Java and/or 1+ year with Kotlin
• Confident hands-on experience with SQL databases (PostgreSQL/MySQL)
• Experience designing reliable, scalable systems
• Experience with distributed systems
• Experience with cloud environments (AWS/GCP)
• Technical/computer science-related degree
• 2+ years of active hands-on use of AI tools

Nice to have

• Fintech experience and experience with high-load, complex systems
• Observability/Alerting tools (Prometheus, Grafana)
• Infrastructure as Code (Terraform)
• Message brokers (Kafka/SQS/RabbitMQ)

Why Solidgate?

High-impact role. You’ll work at the very core of our payment processing — the critical path for every transaction, including Apple Pay, Google Pay, and card payments.

Great product. We’ve built a fintech powerhouse that scales fast. Solidgate isn’t just an orchestration player — it’s the financial infrastructure for modern Internet businesses. From subscriptions to chargeback management, fraud prevention, and indirect tax — we’ve got it covered. We hold financial licenses in key regions and are a direct Visa & Mastercard partner and sub-reseller (top 5 globally).

Massive growth opportunity. Solidgate is scaling rapidly — this role will be a career-defining move.

Top-tier tech team. Work alongside our driving force — a proven, results-driven engineering team that delivers.

Modern engineering culture. TBDs, code reviews, solid testing practices, metrics, alerts, and fully automated CI/CD.

💌 The Extras: 30+ days off, unlimited sick leave, free office meals, health coverage, and Apple gear to keep you productive. Courses, conferences, sports and wellness benefits — all designed for ideas, focus, and fun.

Tomorrow’s fintech needs your mindset. Come build it with us.

🫂 Know top talent? We’re always on the lookout. Refer someone for our role, and if they get hired, there’s a bonus waiting for you — simple as that.

We are looking for a motivated Junior+ Backend Developer to join our development team.

As a Junior+ Backend Developer, you will work together with experienced developers to develop, maintain, and improve existing and new web projects. You will be involved in backend development, database-related tasks, debugging, integrations, and ongoing support of company projects.

This is a great opportunity for a developer who already has practical PHP/Laravel experience and wants to grow their technical skills while working on real-world projects.

Responsibilities

• Develop and maintain backend functionality for company projects
• Implement new features and improvements 
• Provide ongoing support and bug fixing for existing solutions
• Write clean, readable, and reusable code
• Work with databases and develop SQL queries
• Integrate external APIs and third-party services
• Participate in debugging and troubleshooting of applications
• Work with Git and follow the team’s development workflow
• Work with Linux systems and basic server-side tasks
• Participate in code reviews and team discussions
• Follow development tasks and priorities defined by the team lead
• Learn and apply new technologies and development best practices
• Communicate with other developers, QA, and other team members

Requirements

• 1+ year of commercial or practical experience in web development
• Good understanding of PHP
• Basic to intermediate experience with Laravel
• Good understanding of SQL
• Basic knowledge of JavaScript, HTML and CSS
• Experience with Git
• Basic knowledge of Linux and Bash commands
• Understanding of REST APIs and basic API integration concepts
• Basic understanding of MVC and OOP principles
• Ability to read and understand existing code
• Ability to research solutions and learn new technologies independently
• Attention to detail and responsible attitude toward tasks
• Ability to work independently and as part of a development team
• Good time-management and problem-solving skills
• Intermediate English or higher
• On-site work from office in Kyiv or in Tirana

Would be a plus

• Experience with WordPress
• Experience with Docker
• Basic knowledge of Nginx or Apache
• Experience with Laravel queues, jobs, events, and scheduled tasks
• Understanding of database migrations and optimization
• Experience with Linux server administration
• Familiarity with PHPUnit or other testing frameworks
• Experience with CI/CD

What we offer

• Opportunity to work on real commercial projects
• Mentorship and support from experienced developers
• Opportunity to grow to a Middle Backend Developer
• Experience with modern development tools and technologies
• Interesting tasks involving APIs, databases, integrations, and automation
• Friendly and collaborative development environment

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 Opportunity

Our client is an international product company focused on advancing its technology platform and building innovative, scalable solutions.

The platform brings together multiple interconnected services, requiring robust architecture, seamless integrations, and efficient data processing. The engineering team tackles complex backend challenges, enhances existing functionality, and develops new capabilities while maintaining high standards of performance and reliability.

The company fosters a collaborative, ownership-driven engineering culture and actively integrates AI-powered technologies to streamline development and support ongoing product innovation.
 

About the Role

We are looking for a skilled Senior Python Engineer to join an international product development team.

In this hands-on role, you will design, build, and maintain backend services, enhance existing functionality, and develop new product features using Python, modern frameworks, cloud technologies, and distributed systems.

You will have the opportunity to influence architectural decisions, participate in technical discussions, and take ownership of solutions from design to production.

A key part of this role is the active use of AI-assisted development tools and coding agents. We are looking for someone who already uses these technologies extensively in daily development to accelerate delivery, solve engineering challenges, and maintain high code quality.

While the main focus is backend engineering, we value a flexible mindset and a willingness to occasionally contribute to frontend or infrastructure-related tasks.
 

Key Responsibilities

• Design, develop, and maintain scalable Python backend services and FastAPI-based microservices.
• Build and enhance APIs, internal service communication, and external integrations.
• Optimize distributed systems, asynchronous messaging, and data processing workflows.
• Participate in architecture discussions, technical reviews, and feature development.
• Develop and support AI-powered functionality, including LLM integrations and prompt-based workflows when applicable.
• Ensure high standards of performance, scalability, testing, observability, and reliability.
• Troubleshoot production issues, resolve defects, and improve existing services.
• Collaborate across teams and repositories to deliver complex technical solutions.
• Integrate AI-powered coding tools into daily development and help shape best practices for their effective use.
   

Required Skills & Experience

• 5+ years of professional Python backend development experience.
• Strong knowledge of microservices architecture and distributed systems.
• Proven experience building enterprise-level web services with FastAPI, Django, or similar Python frameworks.
• Hands-on experience designing APIs, building integrations, and implementing service-to-service communication.
• Experience with asynchronous messaging technologies, such as Kafka, RabbitMQ, AWS SQS, or equivalent solutions.
• Practical experience developing, deploying, and maintaining cloud applications using AWS and its managed services.
• Experience with Docker and containerized environments.
• Strong practical experience with AI coding tools and agents, actively used as part of everyday software development rather than occasional assistance.
• Ability to work independently, make technical decisions, and take full ownership of features from design to delivery.
• Excellent English communication skills.
   

Nice to Have

• Experience integrating LLMs, AI models, or AI-powered features into production applications.
• Familiarity with Kubernetes, CI/CD pipelines, and modern deployment workflows.
• Experience building data-intensive applications and processing large volumes of information.
• Frontend development experience, particularly with Angular.
• Exposure to cloud infrastructure, deployment automation, or platform engineering.
• Previous technical leadership experience or an interest in growing into a leadership role.
   

Why Join Us?

• 20 days of paid vacation annually, plus official public holidays in your country of residence.
• Full accounting and legal support in all countries where we operate.
• Fully remote work with a powerful workstation and access to a co-working space if needed.

As our Senior AI Engineer, you'll own the intelligence layer of the platform — the gateway, tools, retrieval, and evaluation that let an AI assistant read and act inside a regulated ERP as the signed-in user, and never as anything more. In manufacturing that answers to auditors, an assistant that's confidently wrong, or that touches a record it shouldn't, is worse than no assistant at all. Your work is making AI trustworthy enough to put in front of a quality manager.

This isn't a role for working through a queue of well-specified tickets.

 You'll take large features from a loose problem statement to production — agentic workflows, AI on mobile for the shop floor, and the system and infrastructure changes underneath them. You'll decide what to build as much as how, and you'll push for the breakthrough features that make customers switch, not only the ones already on the roadmap.

The ideal candidate thrives in startup ambiguity, moves with real urgency, and has a track record of turning open-ended problems into shipped products without waiting to be told what's next.

What You'll Do

01 — Take large features from idea to production.

Own agentic workflows and AI on mobile end to end. Start from the user's problem, shape the solution, write the plan and the tickets, build the React and mobile interfaces that make AI output trustworthy and actionable, ship it, and measure whether it worked.

02 — Make and own large system changes.

Propose, defend, and carry through the architecture and infrastructure the AI layer depends on — background agents and job queues, observability, cost metering, per-tenant limits, and model version pinning.

Required Qualifications

- 8+ years building and shipping production software, including 2+ years shipping LLM-powered features to real users, and a track record of owning large features end to end.

- AI-native engineering practice — you've rebuilt how you work around agents rather than adding them to an old workflow. Claude Cowork as your primary tool, with strong hands-on experience using Claude Code, Cursor, Codex, or similar; you direct agents through most of the implementation and stay disciplined about the quality, stability, and extensibility of what they produce.

- Product sense and ownership — you work from problems, not specs. You figure out what users and the business actually need, write your own tickets, make the call when the answer isn't obvious, and drive work to done without needing direction repeated.

- Production LLM application engineering — tool calling, structured output, prompt and context design, and streaming, with Claude, OpenAI, or similar, via AWS Bedrock or direct APIs.

- Retrieval-augmented generation in production — chunking, embeddings, and hybrid search on pgvector or equivalent, with access control enforced at retrieval time.

- Evaluation and AI security discipline — you've built eval suites that gate releases, and you design against prompt injection, data leakage through tool output, and cross-tenant access from the start.

- Strong TypeScript, React, and Next.js in production — enough to own the AI experience end to end rather than hand it off.

- Production experience with PostgreSQL — schema design, query optimization, and operating it at scale.

- Hands-on with AWS services — Bedrock, RDS, Fargate, S3, VPCs, IoT Core, DynamoDB, and related infrastructure.

- Disciplined engineering fundamentals — SOLID, DRY, and Domain-Driven Design applied to complex business domains, with unit and integration tests as part of your normal workflow.

- B.S. in Computer Science, Mathematics, Physics, Engineering, or equivalent practical experience.

Preferred Qualifications

- Early-stage startup experience — you've shipped at weekly cadence, owned outcomes rather than tasks, and built something new that changed what the product could do.

- Shipped mobile applications — React Native or similar — for field, operator, or shop-floor use.

- Experience building manufacturing software or Industrial IoT systems — ERP, MES, or SCADA platforms, or machine connectivity over MQTT, OPC-UA, or similar.

- Hands-on with the Model Context Protocol — MCP servers or clients, and OAuth 2.1 authorization for agents.

- C# / .NET experience, as our core services move to a C# and AWS architecture.

- Exposure to compliance frameworks such as SOC 2, GAMP 5, ISO 13485, 21 CFR Part 11, or similar.

Readiness to work from 16:00 till 01:00 in order to have an optimal overlap of work hours with USA based teams.

Pine Software Technology Ltd is a software company specializing in trading technology solutions for regulated brokers and trading firms. We build SaaS products that support electronic trading, brokerage operations, risk management, and financial data analysis.
We are looking for a Python Engineer to join our team and work on high-performance backend services, data pipelines, and ML-driven components used in real-time trading systems.

Responsibilities
— Design, develop, and maintain high-performance backend services and APIs
— Build and improve microservices with a focus on scalability, performance, and reliability
— Design and optimize asynchronous background jobs, workers, and task pipelines
— Work with SQL and NoSQL databases, choosing the right solution for each use case
— Work with messaging systems (queues / pub-sub) for distributed communication
— Participate in architecture discussions, code reviews, and technical decision-making
— Participate in architecture discussions, code reviews, and technical decision-making
— Collaborate with stakeholders to shape technical solutions and product direction
— Understand CI/CD and containerized deployment processes

Requirements
— 3-4+ years of professional experience as a Python Engineer
— Strong Python skills with the ability to write clean, maintainable, and efficient code
— Experience with modern Python frameworks: Django, FastAPI/Starlette
— Hands-on experience with microservices architecture and API development
— Experience with asynchronous programming (asyncio, multithreading, multiprocessing)
— Experience designing and working with background jobs and task processing systems
— Solid knowledge of SQL and NoSQL databases, including query optimization
— Experience with gRPC or REST APIs
— Experience with message brokers (RabbitMQ, Kafka, or similar)
— Experience using Docker and basic CI/CD workflows
— English level: B1

Nice to Have
— Familiarity with Kubernetes
— Knowledge of monitoring and logging tools (Prometheus, Grafana, ELK, OpenTelemetry)
— Strong unit testing practices and experience with TDD
— Experience in a product company

What We Offer
— Care from Day One — medical insurance from your first day, including dental care, massage, and professional psychological support
— Work-Life Balance — 25 days of paid vacation + 30 days of paid sick leave
— Investment in Your Energy — partial reimbursement for sports and fitness activities
— Growth & Learning — coverage for English or Ukrainian language courses and a dedicated professional development budget
— Knowledge Library — office books and access to the Kuka online library
— Island Relaxation — up to 14 days per year at the company villa in Cyprus
— Modern Workspaces — Unit City (Ukraine) with full power-backup infrastructure or a modern office in Larnaca, Cyprus

Join the Pine Software team, where your talents and aspirations will be recognized! We offer a dynamic work environment, opportunities for professional growth, and support at every step of your career path. Start your journey to success with us—apply today and take the first step towards your bright future!

Pine Software is an equal opportunity employer. We encourage applications from candidates of all backgrounds and experiences. Please note that only shortlisted candidates will be contacted. Thank you for considering Pine as your next career move!

We are looking for C# developer for our music software

( work in Lviv or Kyiv,

remote work possibility ):

www.MusConv.com

About the project:

MusConv is b2c music software which helps people synchronize their music between music services: Spotify, Apple Music, YouTube Music, Amazon Music, Tidal and others.

We offer:

Challenging interesting project

Professional growth and development program

Flexible schedule

Team of highly talented individuals

Access to developer courses like https://www.pluralsight.com

Mentor: code reviews, studying( fiddler, postman, asynchronous programming, etc.)

5% of sources is simple gui based on xaml( avalonia similar to wpf )

95% of sources is regular .net standard( backend to interact with different music services )

We are looking for C# developer to implement new features

On behalf of our Client from the UK, Mobilunity is looking for  Senior Python Engineer.

You will join a small, international product team building an API-first financial technology platform that provides automated working capital solutions to UK small businesses.

The role is highly impactful: you will design and build reliable, scalable services that directly influence how businesses access working capital. You’ll work in an environment with a high level of ownership, fast feedback loops, continuous deployment, and plenty of room to shape both the technology and the product.

This is not a role where everything is already defined. You’ll work with real ambiguity, help shape evolving architecture, make decisions with incomplete information, and collaborate closely with domain experts and other engineers.

What we’re looking for:

We need an engineer who is comfortable taking ownership of complex problems, making pragmatic technical decisions, and working in a product environment where both the codebase and the domain are continuously evolving.

The ideal candidate:

• thinks beyond implementation;
• is comfortable making decisions with incomplete information;
• understands scalability, reliability, security and business impact;
• has strong opinions about writing high-quality, typed Python;
• enjoys system design and building well-structured APIs;
• uses AI tools as a serious part of their engineering workflow while applying independent judgment;
• is comfortable working in a collaborative, low-ego environment.

Responsibilities:

• Design, develop and maintain scalable backend services using Python.
• Design and implement domain services using Domain-Driven Design principles.
• Build performant, secure and fault-tolerant serverless solutions on AWS.
• Work closely with subject matter experts to translate business requirements into technical solutions.
• Participate in architectural and technology decisions at both project and company level.
• Design and maintain idiomatic APIs and service boundaries.
• Work with data modelling and SQL to support data-driven decision-making.
• Contribute to infrastructure-as-code and cloud engineering practices.
• Troubleshoot and improve production systems.
• Work with AI coding tools and model-backed product features.
• Mentor other engineers and contribute to engineering best practices.
• Work in an Extreme Programming environment with TDD, continuous deployment and fast feedback loops.

Requirements:

• Strong commercial experience with Python.
• Experience building and running production services on AWS.
• Hands-on experience with AWS Lambda and DynamoDB.
• Experience with event-driven AWS services such as EventBridge and/or Step Functions.
• Strong understanding of typed Python and experience with Pydantic or similar approaches.
• Experience with Infrastructure as Code, preferably Terraform.
• Strong SQL and data modelling skills.
• Experience designing scalable backend systems and APIs.
• Strong understanding of software architecture and system design principles.
• Strong analytical and problem-solving skills.
• Experience working with AI coding tools in a professional engineering environment.
• Advanced English.

Nice to have:

• Experience in FinTech, lending or credit.
• Experience with open banking data.
• Experience with Snowflake or similar data platforms.
• Experience with evolutionary architecture.
• Experience designing eventually consistent systems.
• Experience with domain-driven design.
• Experience with event-driven and serverless architectures.
• Experience working in regulated environments.
• Experience with GitHub Actions or similar CI/CD platforms.

In return we offer:

• The friendliest community of like-minded IT-people
• Open knowledge-sharing environment – exclusive access to a rich pool of colleagues willing to share their endless insights into the broadest variety of modern technologies
• Mobilunity Medical Insurance program designed to attend our teams’ needs
• Paid vacations and sick leaves, including 5 paid days per year that don’t require a sick note
• Perfect office location in the city-center (900m from Lukyanivska metro station with a green and spacious neighborhood) or remote mode engagement: you can choose a convenient one for you, with a possibility to fit together both
• No open-spaces setup – separate rooms for every team’s comfort and multiple lounge and gaming zones
• English classes in 1-to-1 & group modes with elements of gamification
• Neverending fun: sports events, tournaments, music band, multiple affinity groups

Come on board, and let’s grow together!

About the company

At Jump Labs we build products in data-retrieval and entertainment domains. We have subscription based services. We’re profitable, fully independent in terms of funding, and have an employee-friendly high-ownership culture.

We are looking for a Java engineer to reinforce our Backend team.

Requirements
- Strong knowledge of core Java - language internals, collections, and object contracts

- Solid understanding of concurrency and the Java memory model

- Production-level experience with Spring Boot - DI, transaction management, application lifecycle

- Practical experience with JPA/Hibernate and ORM performance pitfalls

- Strong SQL and relational database fundamentals - transactions, indexing, locking strategies

- Experience troubleshooting and optimizing production systems (performance, memory, query issues)

- Understanding of building resilient, fault-tolerant services
- English С1 (conversational)

Nice to have
- Familiarity with modern JVM/Java features (e.g. virtual threads)

- Experience with database schema evolution in production environments

- Awareness of secure coding practices for data access layers

Conditions

- Fully remote setting

- Corporate devices (laptop, power station)

- Unlimited PTO (paid time off) policy
- Claude Code subscription