Jobs Backend

One of the world's largest providers of products and services to the energy industry has a need to develop and support enterprise information system in Oil & Gas domain.
Product being developed is a cloud solution for interpretation of geological and geophysical data. Project is based on SCRUM methodology.
Our project is stable, long-term and constantly adopts new technologies such as newest Java and Eclipse RCP versions, cloud and GPU computing, microservices architecture and other innovative frameworks.
Work supposes close cooperation with Customer team located in Houston and following Agile principles.
Our team is senior, supportive and friendly.

Responsibilities

Collaborate closely with geophysicists, data scientists, and software engineers to translate scientific domain requirements into robust on-prem or Cloud software solutions.

Design, develop, and maintain high-performance applications for geophysical and geological data analysis, interpretation and visualization

Present architectural designs and technical proposals to the architecture review board.

Ability to break down development tasks and lay out clear implementation roadmaps.

Implement and optimize computation algorithms

Design and develop both thin and thick client applications that interact with cloud-based microservices.

Ensure high code quality through unit testing, code reviews, security hardening and continuous integration with other domain tools

Provide technical support and lead user troubleshooting sessions to resolve issues and ensure smooth operation of DSG application.

Mentor junior developers and actively contribute to architectural and

implementation decisions.

Embrace Agile/Scrum methodologies, delivering and demonstrating working solutions at the end of each sprint

Stay current with emerging technologies and trends in geophysical computing and software development.

Skills

Must have

At least 5-10 years of experience

GIS Java Eclipse

ESRI ArcGIS Runtime

ESRI Services and Authentication

Nice to have

DSG experience

Oil and Gas experience is preferred but not mandatory

We are looking Senior Python Engineer to join our team and start creating а new data-related product.

Responsibilities:

• Develop and optimize data indexing, preprocessing, and deduplication pipelines.
• Integrate and configure RAG components, work with vector databases.
• Build ETL/ELT pipelines.
• Optimize system performance and scalability.

Requirements:

• Expert in Python
• Experience building data processing systems, ETL pipelines, or high-load services.
• Experience with asynchronous programming (asyncio, Celery, etc.).
• Secure data processing and serialization (JSON, MessagePack, Protobuf).
• Experience with PostgreSQL, MySQL, or NoSQL (MongoDB).
• Secure coding principles: input validation, avoiding injection attacks.
• Building secure internal APIs (not necessarily web-facing).
  Experience with Docker, Kubernetes, and secure container deployment.

• Familiarity with Linux hardening and secure configuration.

   

Nice to Have:

• Experience with RAG and frameworks for building RAG pipelines.
• Experience working with vector databases.
• Understanding of data mining principles, unstructured data parsing, normalization, and cleaning.

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's product enables users to build financial solutions designed for SMBs that turn manual monthly and quarterly reporting processes into automated ones.

We are looking for a highly skilled and passionate Lead Python Engineer with strong Django expertise and a passion for startups to join our team!

Key Requirements:

🔹 Bachelors degree in Computer Science or related field;
🔹 5+ years of experience in software development in a SaaS company;
🔹 Fluent in Python (Django);
🔹 Excellent knowledge and experience with building, optimizing, and maintaining large-scale production systems;
🔹 Experience with writing unit tests and integration tests;
🔹 Experience with Relational DBs (Postgres, MSSQL);
🔹 Experience and familiarity with Cloud Architecture and services;
🔹 Knowledge of REST and experience working with REST APIs;
🔹 Familiar with KISS, DRY, SOLID, OOP;
🔹 Knowledge of Celery;
🔹 English - Upper-Intermediate or higher.

Will be plus:

🔹 Familiarity with Azure;
🔹 Knowledge of RabbitMQ;
🔹 Knowledge of Redis;
🔹 Knowledge of Excel Add-Ins.

What you will do:

🔹 Take part in developing the backend of the SAAS application;
🔹 Develop and lead end-to-end development of new features and services in a multi-service environment while maintaining high quality and standards;
🔹 Develop scalable web APIs, implement sophisticated business logic, and develop asynchronous services in a data-oriented, scalable application;
🔹 Take part in a multidisciplinary team involving algorithms/frontend/UI/DevOps;
🔹 Play a significant role in the entire development life-cycle, from design to production.

Interview stages:

🔹 HR Interview;
🔹 Tech interview with Team Lead;
🔹 Interview with PM;
🔹 Interview with VP R&D (optional);
🔹 Reference check;
🔹 Offer.

Hi, we are AmiFactory, the outsourcing software development company. We design, build, and launch products with our global partners.

Currently, we are looking for someone good at developing secure and robust backend for our web and mobile apps using Python/Django.

We are located in Kyiv, but prefer remote work for now.

You will work on products in the field of fintech, tourism, shopping, and e-mobility. We have both new and ongoing projects, but without tons of legacy.

Our requirements are pretty simple:

1. You have at least 1 year of experience in backend application development and have worked on apps that are a bit more complex than the Django polls project.

2. You can implement a designed and described data model and REST API for it. And also, you know how to perform background jobs, like sending emails.

3. You understand how to work with ORM, middlewares, channels, JSON, JWT, WSGI/ASGI.

4. You have experience integrating (or at least you understand how it can be done) third-party services, like MailGun, Firebase, S3, payment gateways, etc.

5. You heard about software architecture and even use some to keep the project readable, robust, and flexible during the whole lifecycle.

6. You are ready to take part in the designing process of the data model, business logic, and APIs for various clients based on requirements.

7. You don't have problems with tools like PyCharm/VS Code, Docker, Git/GitLab/GitHub, an issue tracker, and a terminal.

Will be a plus if you:

Have experience with PostgreSQL and MongoDB;

Have good knowledge of how things like Web server, WebSockets, and HTTP work;

Have experience with video streaming;

Have experience with DevOps methodology.

We offer:

Competitive salary depends on the results of the interview;

Professional team;

Modern tech stack;

Simple work process and communication between team members;

20 days of vacation.

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's product is a cloud-based financial planning and analysis (FP&A) platform designed for SMBs, transforming manual monthly and quarterly reporting into automated, scalable processes.
Solution connects to organizational systems such as ERP, CRM, HRIS, and complex Excel files, consolidating all data into a single cloud-based database. Product automates critical financial transformations including FX conversions, eliminations, hierarchies, financial adjustments, and more while allowing end-users to continue working in Excel as they always have.
Serving primarily the US market, our client is experiencing strong and sustained growth. This is an exciting opportunity to lead a multidisciplinary R&D team and work on a cutting-edge SaaS product at scale.

Our technology teams are the engine of our business.
We maintain a dynamic startup culture that encourages innovation, ownership, and critical thinking. On our project, you’ll collaborate with a global team of engineers, architects, product managers, and customer-facing teams to shape the future of financial planning and analysis.

Key Requirements:

🔹 BSc in Computer Science or equivalent;
🔹 8+ years of software engineering experience, including 5+ years of Python in production;
🔹 3+ years in an R&D team lead, leading cross-functional teams (backend, frontend, and QA) in a production environment;
🔹 Proven experience managing and leading remote teams in a fully distributed, remote-only environment;
🔹 Proven experience working in a product-based company (not project/outsource);
🔹 Strong experience with Python backend development in a SaaS environment, including cloud-based, scalable, and high-availability distributed systems;
🔹 Strong knowledge of REST APIs, microservices, asynchronous programming, and testing;
🔹 Hands-on experience with CI/CD pipelines and Infrastructure-as-Code (e.g., Terraform, Helm);
🔹 Solid understanding of software architecture, design patterns, and technical trade-offs;
🔹 Proven ability to lead projects end-to-end, from requirements and design through development and production;
🔹 Excellent communication skills and high proficiency in English.


Technical Experience:

🔹 Python frameworks: Django, FastAPI;
🔹 Databases: PostgreSQL, MSSQL;
🔹 Messaging & async processing: Celery, RabbitMQ;
🔹 Caching & performance: Redis;​​​​​​​
🔹 Cloud platforms and services;
🔹 Familiarity with event-driven architectures and distributed systems;
🔹 Strong grasp of KISS, DRY, SOLID, OOP principles;​​​​​​​

Will be plus:

🔹 Experience with Azure cloud services;
🔹 Experience with Excel Add-ins or data-heavy applications;
🔹 Startup or high-growth SaaS company experience;​​​​​​​

What you will do:

🔹 Lead and manage a cross-functional R&D team of 5–7 engineers, including backend (Python), frontend (Angular), and QA engineers;
🔹 Own end-to-end product development, from initial requirements and design, through development, testing, deployment, and production monitoring & troubleshooting;
🔹 Provide hands-on technical leadership, including architecture design, coding when needed, and thorough code reviews;
🔹 Work closely with Product Managers and Architects to define scope, prioritize backlog, and deliver high-quality features;
🔹 Drive engineering best practices: clean code, testing, CI/CD, performance, reliability, and security;
🔹 Be accountable for team delivery, quality, velocity, and stability;
🔹 Define team goals, KPIs, and success metrics;
🔹 Mentor and develop team members, supporting their professional and technical growth;
🔹 Participate in hiring, onboarding, and training of new team members;
🔹 Actively monitor production systems, lead incident response, root-cause analysis, and continuous improvement.

Interview stages:

🔹 HR Interview;
🔹 Tech interview with Team Lead;
🔹 Interview with PM;
🔹 Interview with VP R&D (optional);
🔹 Reference check;
🔹 Offer.

Why Join Us?

At YozmaTech, we’re self-starters who grow together. Every day, we tackle real challenges for real products - and have fun doing it. We work globally, think entrepreneurially, and support each other like family. We invest in your growth and care about your voice. With us, you’ll always know what you’re working on and why it matters.

From day one, you’ll get:

🔹 Direct access to clients and meaningful products;
🔹 Flexibility to work remotely or from our offices;
🔹 A-team colleagues and a zero-bureaucracy culture;
🔹 Opportunities to grow, lead, and make your mark.

After you apply

We’ll keep it respectful, clear, and personal from start to offer. You’ll always know what project you’re joining - and how you can grow with us.

Everyone’s welcome

Diversity makes us better. We create a space where you can thrive as you are.

Ready to build something meaningful?

Let’s talk. Your next big adventure might just start here.

We are looking for an AI-First Golang Developer. We don’t need coders, we need Golang backend engineers who build features end-to-end using Claude Code.

Details:

• AI coding experience (mandatory!): experience with Claude Code — #1 priority, or other agentic coding tools. Claude Code is what is used on the project
• Senior Golang Developer, 5+ years of experience, can potentially consider really strong candidates with 4 years of experience
• Strong proficiency in English (Upper-intermediate level or Advanced)
• Full-time
• Fully remote
• Start: ASAP, ideally, or can be discussed. 1 month’s notice will not work.

What you’ll actually do:

• Own features end-to-end: from specs to deployment to fixing bugs
• Use Claude Code to generate Golang backend code
• Review AI output for quality and architectural fit
• Fix bugs to learn our codebase, then rapidly build new features
• Make quick decisions on what to build vs buy vs generate with AI
• Talk to customers when they report issues and ship fixes same day

Our stack:

• Backend: Golang monorepo
• AI: Claude Code (mandatory), other agentic coding tools

Products you will build:

• API: platform features, tooling, multi-agent system, etc.

You must have:

• Ownership mentality with a strive for elegantly simple, high-quality solutions
• Strive for max quality — you test your own work thoroughly since we have no QA team, everything you ship MUST work
• Product mindset — you care about WHY we’re building something
• Proven experience using Claude Code or similar agentic AI (Cursor, Windsurf)
• Strong Golang experience — you’ll review AI’s code in these, and you must understand how it works
• Broad architectural knowledge of building backend
• Excellent spoken English and a good internet connection for daily video calls

You are a great fit if you:

• Get frustrated when development takes weeks instead of days
• You think in features and architecture, and not single lines of code
• Can spot subtle bugs in AI-generated code quickly
• You ship fast but always verify it actually works
• Have shipped real products that customers actually use
• Think “how can AI build this?” as your first instinct

Red flags (don’t apply if):

• You’ve never used Claude Code or similar AI coding tools
• You’re a perfectionist who loves to code
• You need detailed specs before starting
• You see AI as a threat rather than leverage
• You’re outside the European timezone

ExistLive is a zero-fee ticketing, RSVP, and fundraising platform built for nonprofits, artists, and event organizers.

Role Overview

We’re looking for a Back-End Engineer to design, develop, and maintain our web applications and infrastructure. You’ll work closely with our front-end and product teams to deliver clean, reliable, and scalable systems that power real-world events and fundraising campaigns.

Format: Remote, full-time

Timezone: EEST (Kyiv) with at least 4 hours overlap

Start: ASAP

Responsibilities

• Build clean and fast Go services on Cloud Run (stateless, timeouts, concurrency, graceful shutdown).
• Develop and refine Stripe payment flows (Checkout / Connect / SetupIntents, webhooks, idempotency, retries).
• Implement ticketing logic (reservations, row-level locks, compensations on failure).
• Design and evolve REST APIs (OpenAPI-first), ensure backward compatibility and proper error handling.
• Work with PostgreSQL: schemas, migrations, indexes, EXPLAIN/ANALYZE, and query optimization.
• Integrate with Elastic proxy for event/ticket indexing and rebuild pipelines.
• Add observability (Datadog metrics/logs/traces) and define alerting standards.
• Write meaningful unit/integration tests and participate in constructive code reviews.

Qualifications

• 2+ years of production Go experience (context, goroutines, sync, http, pgx/driver).
• Strong SQL/PostgreSQL background (transactions, EXPLAIN, deadlocks, row-level locking).
• Understanding of Stripe/webhooks/idempotency — or willingness to learn quickly.
• Basic GCP/Docker experience (Cloud Run, environments, secrets).
• Strong API design mindset with Clean Architecture principles (SOLID, KISS, DRY, YAGNI).
• Self-driven, reliable, and ready to take ownership of full feature chunks — no micro-tasks.

Preferred Skills

• Firebase Auth, external login providers.
• Datadog APM (tracing, log correlation).
• Elasticsearch integration, indexing pipelines.
• OpenAPI-first, client/server generation; compile-time DI (Wire/alternatives).
• Intermediate+ English for documentation and team communication.

Tech Stack

Language: Go 1.25+

HTTP: Chi router + custom middleware

Database: PostgreSQL + PostGIS

ORM: GORM

Search: Elasticsearch (via proxy service)

Payments: Stripe (Checkout / Connect / SetupIntents)

Auth: Firebase Auth (+ custom tokens)

gRPC: partial, expanding

Containerization: Docker

CI/CD: GitHub Actions

Infrastructure: GCP (Cloud Run, App Engine, Cloud Storage)

Observability: Datadog

Code Quality: golangci-lint, testify tests

Who we’re looking for

• 2+ years of production Go experience (context, goroutines, sync, http, pgx/driver; profiling is a plus).
• Strong SQL/PostgreSQL: transactions, indexes, EXPLAIN, deadlocks, row‑level locking.
• Understanding of Stripe/webhooks/idempotency — or willingness to learn fast.
• Basic GCP/Docker experience: build an image, deploy to Cloud Run, configure environment variables/secrets.
• API design skills and commitment to simplicity (KISS, Clean Architecture).
• Self‑driven, go-getter mindset, and ready to take chunks of work, not micro‑tasks.

How We Work

• GitHub Flow: small PRs, meaningful commits.
• Linters via golangci-lint, formatting with gofmt/goimports.
• Mandatory idempotent handlers for webhooks and retries with backoff.
• Non-functional priorities: reliability > performance, with performance budgets for hot paths.

What We Offer

• Visible impact: your code powers real-world events and fundraising.
• Influence on architecture and technical debt priorities.
• Transparent code reviews and respectful collaboration.
• Paid 2-week trial period, followed by clear decision from both sides.
• 10 paid vacation days per year (after 1 year, flexible usage).

💬 Don’t meet every single requirement?

No problem. If you’re excited about what we’re building, we’d love to hear from you.

Quantum is a global technology partner delivering high-end software products that address real-world problems. 

We advance emerging technologies for outside-the-box solutions. We focus on Machine Learning, Computer Vision, Deep Learning, GIS, MLOps, Blockchain, and more.

Here at Quantum, we are dedicated to creating state-of-art solutions that effectively address the pressing issues faced by businesses and the world. To date, our team of exceptional people has already helped many organizations globally attain technological leadership.

We constantly discover new ways to solve never-ending business challenges by adopting new technologies, even when there isn’t yet a best practice. If you share our passion for problem-solving and making an impact, join us and enjoy getting to know our wealth of experience!

About the position

Quantum is expanding the team and has brilliant opportunities for a Software Engineer. The client is a technological research company that utilizes proprietary AI-based analysis and language models to provide comprehensive insights into global stocks in all languages. Our mission is to bridge the knowledge gap in the investment world and empower investors of all types to become “super-investors.”

Through our generative AI technology implemented into brokerage platforms and other financial institutions’ infrastructures, we offer instant fundamental analyses of global stocks alongside bespoke investment strategies, enabling informed investment decisions for millions of investors worldwide.

Must have skills:

• 5+ years of professional Python development
• 2+ years working with Apache Spark and ETL pipelines
• At least 1 year of practical experience with Kubernetes and containerized environments
• Strong knowledge of SQL and NoSQL databases
• Hands-on experience building APIs with FastAPI
• Proficiency with Docker, CI/CD processes, and Git version control
• Solid background in AWS cloud services
• Practical understanding of Airflow or similar workflow orchestration tools
• Upper-Intermediate or higher English proficiency (spoken and written)

Would be a plus:

• Experience in the financial domain
• Experience with LLMs (Large Language Models)
• Experience with DynamoDB, Delta Lake, Couchbase
• Experience in Google Cloud

Your tasks will include:

• Develop and maintain services with LLM-based solutions
• Optimize ETL pipelines and integrate models into production
• Develop and maintain backend APIs
• Deploy and manage pipelines on AWS
• Kubernetes service development
• Collaborate with other teams and managers
• Participate in code reviews and follow existing engineering standards

We offer:

• Delivering high-end software projects that address real-world problems
• Surrounding experts who are ready to move forward professionally
• Professional growth plan and team leader support
• Taking ownership of R&D and socially significant projects
• Participation in worldwide tech conferences and competitions
• Taking part in regular educational activities
• Being a part of a multicultural company with a fun and lighthearted atmosphere
• Working from anywhere with flexible working hours
• Paid vacation and sick leave days

Join Quantum and take a step toward your data-driven future.

Full-time on site/hybrid (Lviv) or remote (countrywide employment) 

We are looking for a highly skilled Senior Front-End Developer with strong expertise in Drupal to join our team. The ideal candidate is detail‑oriented, proactive, and passionate about building high-quality, responsive, and accessible user interfaces.

Requirements

• 4–5 years of experience with Drupal, including theming, modules, and Drupal API.
• Excellent spoken and written English; strong communication and collaboration skills.
• Proven experience in responsive and cross‑browser development with a strong focus on UI/UX quality.
• Solid understanding of modern build tools and workflows: Webpack, Gulp, npm, Yarn.
• Experience optimizing websites for performance and accessibility (Lighthouse, Axe, PageSpeed).
• Ability to translate design layouts into code using Figma or similar tools.
• Understanding of frontend security best practices and clean coding standards.
• Familiarity with Docker, DDEV, or other local development environments.
• Strong knowledge of Git and version control workflows.
• Experience working in Agile development environments.
• Ability to work with ticketing systems such as Jira, Azure, or similar.
• Capability to create clear, structured, and comprehensive documentation (e.g., Confluence).
• Nice to have: Experience with modern JS frameworks/libraries such as React or similar.

Key Responsibilities

• Develop, maintain, and enhance front-end components for websites built on Drupal 11+.
• Implement responsive, accessible, and high-performance user interfaces based on design mockups or UX specifications.
• Write clean, semantic, and maintainable HTML, CSS, and JavaScript following industry best practices.
• Work with Twig or other templating/component-based frameworks to build reusable UI elements.
• Integrate front-end components with backend APIs and data sources.
• Collaborate closely with backend developers to align data structures, endpoints, and template logic.
• Optimize websites for speed, accessibility, and SEO.
• Participate in code reviews, testing, debugging, and troubleshooting.
• Ensure visual and functional consistency across projects by following design systems and component libraries.
• Create and maintain high‑quality technical documentation for implemented features.
• Schedule: 3:00 PM – 12:00 AM Kyiv time
   

What’s in it for you:  

• Remuneration package: annual salary review & bonus, 28 days of paid vacation, paid sick leaves, medical insurance, IT Club discount program; 
• Official employment; 
• Personal & Professional development opportunities 
• International environment and diverse team; 

How we will proceed: 

You send us your CV → We contact relevant applicants → Interview with a Recruiter → Technical task submission → Interview with Hiring Team → Job Offer ​communication to the Finalist​ → First working day ​ 

Job Description

Must Have:

• Good Python knovledge for production LLM systems (async, APIs, clean architecture)
• Design and implementation of agentic architectures (single/multi-agent, tool-designing, tool-calling, planner–executor patterns)
• Advanced prompt engineering (instruction hierarchy, few-shot prompting, guardrails, templating)
• LLM context optimization (context window management, token budgeting, cost control)
• Conversation history summarization (semantic compression, role-aware summaries, extractive/abstractive methods)
• Agent pre-configuration (fixed personas, scoped tools, hardened prompts, versioned configs)

Job Responsibilities

• Design and deploy production-grade LLM and agentic systems using Python, async pipelines, and APIs
• Develop and optimize agent architectures, including multi-agent workflows, tool-calling, and planner–executor patterns
• Apply advanced prompt engineering and context optimization to improve model quality, latency, and cost
• Build conversation memory and summarization mechanisms using semantic compression techniques
• Define and maintain agent configurations and guarded prompts for reliable production behavior
• Ensure scalability, observability, and robustness of ML systems in production

Department/Project Description

We’re building a platform of cutting-edge Generative AI services that automate the boring parts of software development—from test generation to infra setup. We’re hiring a highly technical software ML engineer with Pthin who lives in code, understands cloud-native stacks (Azure, GCP, Kubernetes, Terraform), and enjoys transforming complex real-world scenarios into reliable solutions. You’ll disover and implement different agentic structures and provide LLM context optimization to make a profitable product.

Skill Category

AI/ML

Project Description:
Recovery for All (RFA) is a seven-year (2025–2031) technical assistance project, funded by Global Affairs Canada and implemented by Alinea International. 
 

About the Work:
Within the RFA initiative, we develop ProjectUA — a national IT platform for the Government of Ukraine that enables planning, monitoring and evaluation of policy implementation. ProjectUA consolidates government priorities, delivers real-time progress monitoring, and supports transparent, data-driven decision-making. 
 

Today the platform is used by over 900 civil servants across 50+ ministries and agencies and 25 regional administrations. ProjectUA tracks over 10,000 tasks across 20+ strategies and plans, turning dispersed operational data into actionable insights that improve coordination, accountability and the effectiveness of the government.
 

The Role:    

We are strengthening our backend team with a Senior PHP Developer who has a serious engineering attitude toward:
●    Security and compliance
●    System reliability and fault tolerance
●    Performance optimization at scale
●    Clean, auditable, maintainable backend architecture
 

A key responsibility of this role will be integration with government information systems (like Diia, id.gov.ua, Askod, etc.) using national security algorithms, standards and security requirements, including preparatory security and architectural improvements required for government identity service.

Primary tasks are: 
●    Design, develop, and maintain high-quality backend solutions in PHP;
●    Review and improve the existing codebase with focus on security vulnerabilities and performance bottlenecks.
●    Write and maintain unit and integration tests.
●    Prepare and maintain clear technical documentation.
 

Formal Eligibility Requirements (Mandatory):    

Please note: Due to project, contracting, and donor requirements, candidates must meet all of the criteria below in order to be considered:
●    Ukrainian citizenship (mandatory).
●    Registered Ukrainian Private Entrepreneur of the 3d group (consultancy services) or readiness to register as Private Entrepreneur prior to contract signing.
●    Legal ability to provide consultancy services under Ukrainian law.
●    Availability for full-time engagement (Monday–Friday).
 

Required Qualifications:    

Experience:
●    5+ years of professional PHP experience (PHP 7.x / 8.x).
●    Strong experience with Yii2 or similar framework. .
●    Solid knowledge of MySQL, including schema design and query optimization.
●    Strong background in API design and backend architecture.
●    Hands-on experience refactoring monolithic architectures, improving performance and memory usage.
●    Understanding of software design principles and clean code practices (SOLID, OOP, design patterns).
●    Experience with caching and in-memory data stores (Redis).
●    Basic understanding of frontend stack (HTML/CSS, JavaScript, Twig; Vue.js is a plus).

What We Value Most:
●    Engineering mindset focused on long-term system health, not short-term hacks.
●    Strong personal responsibility for security, reliability, and correctness.
●    Ability to work proactively and independently.

As a plus:
●    Experience with Symfony and/or Laravel.
●    Experience working on government, fintech, or other high-compliance systems.
●    Experience preparing systems for external security reviews or audits.
 

Our client is an award-winning global tax services and software provider, is the largest Firm in the world dedicated exclusively to business taxes. With global headquarters in Dallas, Texas, the Firm provides an integrated suite of federal, state, local, and international tax services on a multijurisdictional basis, including tax recovery, consulting, advocacy, compliance, and technology services. The client is a seven-time recipient of the International Service Excellence Award from the Customer Service Institute of America (CSIA) for its commitment to world-class client service. A VAT recovery system for our clients in European countries that would help to automate the regular work of VAT specialists at the company. The client team is located in Portugal.

Responsibilities:

• Design, build, and maintain efficient, reusable, and reliable code
• Contribute to the best possible performance, quality, and responsiveness of applications
• Identify bottlenecks and bugs, and devise solutions to mitigate and address these issues
• Help maintain code quality, organization, and automatization

Requirements:

• 4+ years of experience in Full-Stack development based on .NET and any modern FE framework
• Experience or at least understanding
• Solid knowledge and experience with ASP.NET, .NET Core
• Good understanding of JavaScript (ES6, TypeScript), React
• Experience with cloud technologies (any)
• Confident knowledge of Object-Oriented Design principles
• Good knowledge of MS SQL Server and Entity Framework
• Skilled in using Git or another version control system
• Upper-Intermediate level of English

Nice to have:

• Working knowledge of PHP and experience maintaining or integrating PHP-based applications
• Experience with Azure Cloud

Ajax Systems is a full-cycle company, working from idea generation and R&D to mass production and sales. We do everything: we produce physical devices (the system includes many different sensors and hubs), write firmware for them, develop the server part, and release mobile and desktop applications.

PRO Desktop meets the needs of every professional working with Ajax security systems. Facilities profiling and remote configuration, alarm monitoring and photo verification, staff administering, and a detailed event log — all in one, intuitive interface.

Responsibilities:

— Ajax PRO Desktop development (adding new devices, supporting existing devices, adding new functionality and features, fixing bugs).

— Architectural decisions and concept development.

— Writing tests.

— Hard bug fixing.

— Inter-commands communications.

Stack:

— Python 3, PySide 6, QML, gRPC.

Must have:

— 3+ years of experience with Python, including multithreading, asyncio.

— Knowledge of OOP principles and patterns.

— Experience with aiohttp.

— Experience with pytest.

— Experience with gRPC.

It will be a plus:

— Experience with QML.

— Experience with PySide/PyQt.

We offer:

— Flexible schedule at our offices in Kyiv or Lviv.

— The opportunity to propose and implement own ideas that have an impact on the product and production.

— Work in a motivated team and zero bullshit culture.

— Competitive salary.

— Medical Insurance.

— Corporate English.

— The opportunity to participate in the beta test project of Ajax security systems — receiving and testing new gadgets before their release.

The US based content management and marketing data analysis platform which allows SEO/SMM agencies and their customers to have full control over content planning, collaborative development and publishing to production. It also provides full visibility of content impact on a web site ranking in a real time via massive data collection, aggregation and reporting.

Dev stack you will use:

• Python 2.7 (migrating to 3) Flask
• SQL Alchemy
• PostgreSQL
• Cloudflare Workers
• GCP, AWS

What you will do:

• Build, maintain and refactor backend services using Python.
• Develop asynchronous workflows for data ETL processes. 
• Improve PostgreSQL DB layer: query optimisation, DB structure, service reliability, and parallel execution
• Design and support REST APIs used by frontend and internal services
• Add monitoring, logging, and basic observability to keep the platform healthy

How to work with us:

• Small product team (5 US-based, 1 in EU)
• Agile workflow and Kanban methodology
• Communication over Slack, Zoom in English
• 2 hours daily overlap with MST time zone (10:00-19:30 CET)

What we expect from you:

• 4-6 years of production experience with Python (backend and data‑intensive systems - data ETL flows)
• Strong PostgreSQL fundamentals, query optimisation, and migration.
• Good experience with SQLAlchemy;
• Experience designing background jobs, async tasks, and fault-tolerant workflows;
• Experience integrating with third-party APIs (REST, webhooks, OAuth, background syncs)
• Strong English & communication skills (B2 or hier) 
• A mindset to solve problems, not tasks and testing skills. 
• Big plus: previous experience with SEO, AdTech, or marketing-related products
• Big plus: previous experience with data ETL and Cloudflare Workers

What we offer (besides a motivating salary):

• Working format: fully remote
• Working hours: 10:30 - 19:30 CET (2 hours overlap with MST daily)
• Assignment: full-time, long-term
• Ability to influence the product roadmap
• No overtime - healthy work-life balance
• No rush - we thoroughly plan our work. 

• Compensation: B2B contract with an hourly rate in USD + PTO of 15 working days/annual

   

Our interview process:

• 20m interview with one of our Talent Team Partner
• 30m interview - Tech Screening with our Engineers
• 1h interview - Tech Deep Dive with customer Engineers 
• 30m offer discussion

About the Role

We are looking for a skilled Back-End Developer to join our development team. You will design, build, and optimize high-performance backend services powering gaming platforms, payment systems, and user management modules. The ideal candidate is passionate about clean, scalable architecture and enjoys solving complex technical challenges in a fast-paced environment.

Key Responsibilities

• Design, develop, and maintain backend services and APIs for gaming, payment, and user systems
• Ensure system scalability, reliability, and performance under high load
• Integrate third-party services (payments, KYC, risk, game providers)
• Write clean, maintainable, and testable code following best practices
• Participate in code reviews and mentor junior developers
• Collaborate with front-end, DevOps, QA, and product teams to deliver end-to-end solutions
• Contribute to architectural decisions and technology selection
• Optimize database queries and improve data flow efficiency
• Monitor and troubleshoot production systems and application performance.

Requirements

Must-have:

• 3–5+ years of professional experience in back-end development (for Middle/Senior); 5+ years for Senior
• Strong knowledge of PHP8 and Laravel
• Experience with RESTful APIs
• Solid understanding of SQL/NoSQL databases (PostgreSQL, MySQL, Redis, MongoDB)
• Knowledge of microservices architecture, event-driven systems, and message brokers (Kafka, RabbitMQ)
• Solid experience with ELK and Unit Tests coverage
• Experience with Git, Jira, Confluence
• Understanding of security, authentication, and data protection principles
• Strong problem-solving and debugging skills.
  
   

Nice-to-have:

• Experience of using Clickhouse
• Experience with any of the following: Lumen, Laravel Octane, Swagger, Gitlab, New Relic, Laravel Telescope
• Experience working in high-load or real-time systems (iGaming, fintech, betting, etc.) is a big plus.

We offer

• Fully remote work opportunity
• Enhanced leave benefits:
• 20 days of paid vacation
• 5 paid days off
• 14 paid sick leaves
• Company clubs & communities
• Celebration gifts for personal milestones
• Corporate online events, raffles & challenges
• Corporate English program
• Corporate yoga classes
• Team-building activities
• Coworking compensation
• Training and development programs (internal & external).