Jobs Backend

We are looking for a Simulation Engineer to build and run the simulation tooling behind slot game mathematics within an iGaming product. You turn mathematical specifications into fast, reproducible, config-driven simulations, validate the results, prepare math validation reports, and support developers and QA during integration and testing. The mathematical model itself is owned by a Game Mathematician you will work with closely.
Prior iGaming experience is welcome but not required.

Responsibilities
- Build and maintain a config-driven simulation framework for slot games: reels /weights, paytables and feature parameters defined in configuration rather than in code.
- Make the tooling usable directly by the Game Mathematician, so balancing iterations can be run without engineering involvement.
- Run and analyze Monte Carlo simulations to validate RTP, payout distribution, volatility, hit rate and max win frequency, including convergence and confidence intervals.
- Prepare math validation reports generated from simulation runs, with reproducible results (seeded runs, versioned configurations) and result export.
- Generate the tables, configuration files and exports that accompany the mathematical documentation.
- Cross-check simulation results against analytical calculations and simplified known-answer configurations.
- Write and maintain tests for payout calculation logic, and regression checks on RTP across configuration changes.
- Support developers and QA during integration and testing phases: reconcile differences between the reference simulation and game engine test runs.

Optional / Additional Responsibilities
- Build visualization and reporting tools for payout distributions.
- Set up CI for simulation runs and automated regression on configuration changes.
- Participate in the full game lifecycle (from concept to release).

Requirements
- Strong Python at an engineering level: numpy, vectorization, profiling, working with large data volumes.
- Experience building config-driven, reproducible tools rather than one-off scripts, including seeded runs and versioned configurations.
- Applied statistics: confidence intervals, convergence, variance, and working with rare events and distribution tails.
- Ability to work precisely from a written technical specification, raising ambiguities rather than resolving them independently.
- Testing discipline: unit tests on calculation logic, and validation of simulated results against analytical values.
- Strong analytical thinking, attention to detail, and ownership of results.

Nice to Have
- Experience in iGaming or with casino game mathematics.
- Background in a domain involving applied probability: quantitative finance, actuarial work, sports betting, computational physics, or operations research.
- Performance optimization experience (Numba, Cython, C++ or Rust).
- Experience with CI pipelines for computational workloads.
- Understanding of compliance and regulatory requirements in iGaming.

Workload: full-time, remote
Start: asap
Duration: long and fixed-term (~9–12 months) but with a right to a 8 week notice period
Location: Poland !!!
English: B2

Important info:
Client is very technical and knows who they are looking for, has to be Poland based, max 2-3 hours travel to Wrocław as they have a small team in Wrocław, Poland. Mid + senior profiles are okay.

The Role
A backend-focused engineering position on a transformation project for an international travel company. The engineer will own features end-to-end - from planning and design through building, testing, and release.

Key Responsibilities

• Own features end-to-end (plan, design, build, test, release)
• Build and maintain Ruby on Rails systems
• Contribute to full-stack work (Rails-heavy, with frontend involvement as needed)
• Write tested, high-quality code
• Use AI coding agents to maximize efficiency
• Participate in code reviews
• Maintain systems and resolve production issues
• Collaborate with Product, Design, and Quality Engineering teams

Required Qualifications

• Proficiency in Ruby on Rails with production experience
• Strong database schema design and data modeling skills
• RESTful API design experience
• PostgreSQL and AWS infrastructure knowledge
• Demonstrable experience with AI coding agents, or strong enthusiasm to adopt them
• Good English
• Team-oriented with strong communication skills
• Pragmatic about speed/quality/scope tradeoffs

Tech Stack
Ruby on Rails, PostgreSQL, AWS, Next.js, Vercel. Trunk-based development with CI/CD and multiple daily deployments.

Nice to Have

• E-commerce or travel platform experience
• An eye for UX/design
• Travel enthusiasm

Role Overview:

We are looking for a PHP professional for a client who provides ongoing support for an existing project built on Laravel/Symfony/React technologies. Their approach to implementing features is characterised by a high level of responsibility and attention to detail.

Key Responsibilities:

— Analyse, design, develop, as well as implement and document RESTful services and APIs;

— Troubleshoot software and product databases to ensure functionality;

— Write object-oriented, clean, and maintainable code;

— Implement common APIs based on architecture guidelines and frameworks;

— Integrate data storage solutions;

— Identify potential process improvement areas;

— Work in a self-testing paradigm without dedicated manual QA engineers.

Ideal profile for the position:

5+ years of development experience in PHP 7, 8 and an ability to demonstrate skills and competence in:

— OOP, SOLID principles, design patterns usage (KISS / DRY);

— Experience in building REST APIs;

— Experience with Laravel/Symfony framework;

— Experience with PostgreSQL, MongoDB, Redis;

— Experience with Docker;

— Experience with Git / GitLab;

— Level of English language - upper-intermediate and higher.

What will be an advantage:

— Self-organised, proactive attitude;

— Experience with NodeJS/JavaScript/React;

— Experience with ELK.

The company guarantees you the following benefits:

— Global Collaboration: Join an international team where everyone treats each other with respect and moves towards the same goal;

— Autonomy and Responsibility: Enjoy the freedom and responsibility to make decisions without the need for constant supervision.

— Competitive Compensation: Receive competitive salaries reflective of your expertise and knowledge as our partner seeks top performers.

— Remote Work Opportunities: Embrace the flexibility of fully remote work, with the option to visit company offices that align with your current location.

— Paid Time Off: Prioritise work-life balance with paid vacation and sick leave days to prevent burnout;

— Career Development: Access continuous learning and career development opportunities to enhance your professional growth;

— Corporate Culture: Experience a vibrant corporate atmosphere with exciting parties and team-building events throughout the year;

— Referral Bonuses: Refer talented friends and receive a bonus after they successfully complete their probation period;

— Medical Insurance Support: Choose the right private medical insurance and receive compensation (full or partial) based on the cost;

— Flexible Benefits: Customise your compensation by selecting activities or expenses you'd like the company to cover, such as a gym subscription, language courses, Netflix subscription, spa days, and more;

— Education Foundation: Participate in a biannual raffle for a chance to learn something new unrelated to your job as part of your commitment to ongoing education.

Interview process:

1. An interview with a Recruiter to get to know you and your experience;
2. A 1.5-hour technical interview to check your hard skills;
3. A 1-hour final interview with the Hiring Manager and team members to assess how well you align with the company culture and working style.

If you find this opportunity right for you, don't hesitate to apply or get in touch with us if you have any questions!

Overview
Seeking an experienced Full Stack Engineer to lead technical delivery and architecture of a major workflow modernization tool utilizing Drupal 10 and Vue 3. Ideal candidate combines deep expertise in structured Drupal module development and SPA frontend engineering with hands-on technical leadership across the full delivery lifecycle.
 

Key Responsibilities

• Lead the design and implementation of a self-contained Prior Approval module for a secure scientific compliance platform, integrating deeply with existing inventory and workflow tools.
• Architect full entity structures, custom data models, REST endpoints, and Vue 3 components to enable maintainability and future extensibility by an internal engineering team.
• Own key technical decisions and overall architecture within the delivery team; conduct code reviews, ensure adherence to best practices, and champion high standards.
• Coordinate bi-weekly demos and facilitate feedback cycles, ensuring iterative value delivery and stakeholder alignment throughout phased rollouts.
• Implement test coverage for critical user flows with Cypress E2E tests, and support informal QA and sign-off prior to production deployment.
• Contribute to team knowledge by mentoring others and documenting solutions for long-term maintainability.

Must-Have Qualifications

• 5+ years of hands-on experience with Drupal development, including custom module/plugin development, entity API, and REST endpoint design.
• Advanced skills in Vue 3 and TypeScript, including architecting and delivering production-quality SPAs.
• Demonstrated experience leading technical direction, mentoring teams, and owning architecture in a delivery-focused environment.
• Familiarity with Drupal 10, JSON:API, cron-based automation, and modern CI/CD pipelines (Bitbucket/Docker is a plus).
• Strong knowledge of modern workflow best practices and experience delivering secure, auditable form-based processes.
• Upper-Intermediate / Advanced English conversational skills.

Project / Team Context

• Multi-phase delivery with an emphasis on rapid customer value and continuous improvement.
• Team includes Solutions Architect, Senior Business Analyst, Senior Engineers (Full Stack & Frontend), Senior Project Manager, and QA Engineer.
• End goal is to enable documented, standards-compliant chemical authorization processes, replacing legacy systems with modern, maintainable solutions.

We offer*:

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

*not applicable for freelancers

We run an internal data platform behind a talent representation intelligence product that maps out the entertianment industry.
 

We are rebuilding the platform (legacy Symfony/Angular → Django + React) because the current system stores its most valuable data as unstructured text and can't support where the product is going. . This is not a greenfield toy and not a rescue job — it's a planned rebuild with an unusual amount of groundwork already done:

• A product & architecture document with the domain model decided: what each module means, what dies, what changes, and the conventions (append-only history, structured-at-entry, derived-values-never-facts, and more)
• An epic breakdown with dependency order and explicit definitions of done
• A decisions register — every product ruling logged, searchable, current
• Approved feature specs for the major new modules (representation history, deals/endorsements restructure, awards, drafts)
• A migration standard: raw-row archives, legacy-ID mapping, conflict review queues, rehearsed cutover — nothing silently dropped, nothing silently merged
   

Your job is to design and build within that system: propose schemas and migration plans per module (we call these build contracts — you propose, product approves, then you build), stand up the foundation (auth, field-level permissions, API-first architecture), build the cross-cutting primitives (audit log, unified sources, soft delete, lookups), and run a phased legacy migration where reconciliation counts get reviewed, not just produced.
 

How we work — read this part twice:

• The documents are the spec; the legacy code is not. Many current features are unused and several database tables are mislabeled (we've mapped this). When you hit a question about what something should do, you ask — you don't resolve it from old code. We answer questions daily, in writing, fast.
• Gates are real. Every epic starts with your proposed schema + migration plan; implementation starts after approval. Epics close when their definition-of-done closes — including a researcher completing the workflow without your help — not when the tasks are checked off.
• AI tooling is welcome and expected. We assume you'll use agents/copilots — we do. What we hire for is what the tools can't do: judgment. You verify what your tools produce against the real schema and the real data before it reaches us. "The agent said so" is not a source. (Our favorite recent bug: a generated diagram claiming a name column was an integer. The person who catches that is who we're hiring.)
• Evidence over memory. Unknowns get investigated — code usage, row counts, what breaks — and then ruled on. We don't guess.
  
  You're a fit if:
• Senior Django + React, with real ownership of at least one system end-to-end (schema through UI through deployment)
• You've done at least one legacy migration or system replacement and can talk concretely about what went wrong and what you'd do differently
• You read before you build — genuinely. Our last mismatch was a capable developer who never opened the app or the documents; the interview is designed to detect this, so if it's not you, save us both the call
• You're comfortable proposing designs to a non-engineer product owner who is deeply involved, defending them in writing, and being overruled on product grounds without sulking
• Strong written English; async-first habits; you leave a paper trail by default
• Bonus, not required: search infrastructure (Typesense/similar), data-pipeline/ETL work, having worked alongside scraper/ingestion systems, PostgreSQL depth

Our client is a proven Nordic alarm and event handling software company specializing in Personal Care, Personal Security, and IoT. We are looking for a skilled Full-stack Developer passionate about building reliable, scalable software solutions. If you enjoy working with modern technologies, solving complex integration challenges, and taking ownership of your work, this role is for you!
In this role, you will collaborate directly with the development team on the client’s side, actively participating in all phases of the software development lifecycle.

What you’ll do in this role

• Develop and maintain full-stack applications using C#/.NET and React
• Design and implement scalable cloud-native solutions on AWS
• Build new features and improve existing functionality across the platform
• Collaborate with product managers, designers, and engineers in an agile environment
• Optimize application performance, reliability, and security
• Write clean, maintainable, and well-tested code
• Contribute to architecture discussions and technical decisions
• Explore and leverage AI-assisted development tools to improve engineering productivity

We’re looking for

• 4+ years of commercial experience with C#/.NET
• Hands-on experience with React
• Experience working with AWS and cloud-based applications
• Solid knowledge of SQL and relational databases
• Experience designing and consuming REST APIs
• Understanding of modern software engineering practices and Agile development
• Upper-Intermediate or higher English level

Langate is an award-winning provider of software development services across three primary domains: Healthcare, Business, and Education. We build digital products that solve complex business challenges and create measurable value for our clients. We take pride in our long-term partnerships with U.S.-based companies and our experience delivering scalable software solutions for the Healthcare industry.

We are looking for an experienced Technical Lead who can take ownership of the platform’s backend architecture and lead the technical execution of the engineering team. This role combines architecture, hands-on development, and team leadership. You will design complex backend solutions, decompose them into actionable tasks, support engineers during implementation, review code, and help maintain a high engineering standard across the product.

 

About the project:
 

We are building a large AI-driven platform for the Healthcare domain designed to automate Revenue Cycle Management processes, including billing, payment posting, data processing, and other operational workflows that have traditionally required significant manual effort.
The platform combines traditional workflow automation, data-processing and scraping components, and AI-powered agents capable of handling more complex business processes.

This is a long-term product where the Technical Lead will have significant autonomy and the opportunity to influence backend architecture, engineering practices, technical decisions, and the future direction of the platform.

Requirements:
 

• 6+ years of commercial software engineering experience
• Strong hands-on experience with Python backend development
• Strong commercial experience with Node.js and TypeScript
• Proven experience designing and implementing backend architecture for complex applications
• Experience building scalable, high-load, or high-throughput systems
• Strong understanding of software architecture principles, system design, scalability, reliability, and performance
• Experience designing systems that consist of multiple services, modules, or integrations
• Strong experience with relational databases
• Practical experience with cloud platforms such as Azure or AWS
• Experience leading developers, reviewing pull requests, mentoring engineers, and supporting their professional growth
• Strong problem-solving skills and a pragmatic approach to architecture
• Practical understanding of modern AI-assisted development tools and how to use them effectively throughout the software development lifecycle
• Upper-Intermediate English or higher

Nice to Have:
 

• Experience working on Healthcare products
• Experience working with Redis or similar caching and data-processing technologies
• Experience building AI-powered products, automation platforms, or agent-based systems
• Experience designing distributed systems using Python

Responsibilities:
 

• Own and continuously develop the backend architecture of the platform
• Design scalable, reliable, and maintainable technical solutions for complex product requirements
• Make architectural and technical decisions together with the Head of AI and other stakeholders
• Translate high-level product and business requirements into clear technical solutions
• Mentor developers and support their technical and professional development
• Improve system performance, reliability, maintainability, and observability
• Support the product as it moves further into production and scales across additional modules and business processes
• Promote effective use of AI and LLM-based tools within the engineering workflow

Tech Stack: Python, Node.js, TypeScript
 

Schedule: 5/2, 8-hour working day (40 hr per week), flexible schedule. No late meetings and overtime. 

Hiring Process: HR Interview + Technical Interview.

 

We offer:
 

• Competitive compensation
• B2B contract, paid sick leave, 20 days of paid vacation
• Free English lessons  
• Flexible work schedule  
• Official Ukrainian holidays are non-working days  
• Paid courses and certifications  
• Сoach / psychologist consultation  
• Workshops  
• Career development plan
• Mentoring Education  
• Medical Health Insurance
  
   

Why Choose Us? What Do We Offer that’s Exceptional?
 

1. Cutting-Edge Technologies on Real Projects: At Langate, you’ll work with the latest technologies on live projects. We’re a dynamic, fast-growing company, so you’ll find a minimal amount of legacy systems and plenty of opportunities to implement new technologies.
    
2. Work-Life Balance with Benefits: We value work-life balance and offer paid time off, including vacation days and sick leave. Remote work options and hearty life are part of the package too.
    
3. Investment in Your Growth: We’re committed to your professional development. You can expect training programs, courses, and opportunities to enhance your English language skills.
    
4. Team Building and Unity: We know that a happy team is a productive team. That’s why we organize team-building events and group activities to foster strong bonds and a sense of belonging.

When you choose us, you’re choosing a company that values innovation, invests in its employees, and provides a supportive and engaging work environment. Join us in shaping the future of technology!

Need more information? Welcome!

Position Overview:  

As a .NET Engineer you will drive the technical modernization of a large-scale system from .NET Framework 4.8 to .NET 10. Your work will span the full backend stack — replacing Windows-only dependencies, refactoring legacy patterns, migrating data access to EF Core, and ensuring every service is portable, containerizable, and ready for AWS cloud deployment. You will collaborate closely with DevOps and database engineers as part of a cross-functional Agile team delivering a phased, production-safe migration.

Responsibilities:

• Migrate a .NET Framework 4.8 application to .NET 10.
• Migrate a large database-first Entity Framework 6 model to EF Core 8 across multiple bounded contexts, one domain at a time.
• Identify and replace Windows-only libraries and assembly references that prevent building and running on Linux.
• Establish unit test coverage measurement and enforce quality gates as part of the migration pipeline.
• Collaborate with the DevOps engineer on Dockerfile authoring, environment configuration, and secrets injection.
• Participate in Agile/SCRUM processes, conduct code reviews, and document migration decisions.

Must-Have Qualifications:

• 5+ years of C# and .NET backend development with strong knowledge of ASP.NET and ASP.NET Core.
• Proven, hands-on experience migrating .NET Framework applications to .NET Core / .NET 8, 10 in production.
• Solid experience with Entity Framework Core.
• Solid knowledge of DDD, CQRS, and repository patterns in layered .NET architectures.
• Familiarity with Docker multi-stage builds and Linux container fundamentals for .NET applications.
• Proficient with xUnit and Moq for unit testing; comfortable with container-wired test setups.
• Experience with AWS ECS / Fargate and ECR for deploying containerized .NET applications.
• Familiarity with MassTransit and RabbitMQ or Amazon MQ for event-driven messaging.
• Experience with Hangfire or similar background job processing frameworks.
• Proficient in Git and familiar with Agile/SCRUM team processes.

Nice-to-Have Skills:

• Experience building CI/CD pipelines for .NET projects.
• Familiarity with micro-frontend architecture and Angular-based single-page applications.
• Experience with automated code coverage tooling and enforcing coverage thresholds in CI.
• Experience with performance optimization and scalable enterprise backend systems.

We are currently looking for a Senior Full Stack PHP Developer to join a professional German-based product company team that designs innovative eHealth solutions for hospitals.

You will work on a stable healthcare product, contributing to backend architecture and supporting frontend functionality where needed.

Qualifications:

•  5+ years of professional PHP, with real depth in Symfony (DI, console, event handling, Doctrine). We run PHP 8.4 / Symfony 7.4 and stay current.
• Proven external systems integration experience: you have built and operated interfaces for systems you did not control.
• Experience with writing unit and integration tests.
• SOLID, design patterns, and clean architecture.
• Solid MariaDB/MySQL knowledge.
• RESTful APIs.
• Docker and Bash.
• Strong debugging discipline with log correlation.
• Proactiveness: you raise risks, gaps, and bad assumptions early instead of waiting to be assigned the next ticket.
• Ability to decompose an ambiguous requirement into steps that ship independently. Integration work rarely arrives fully specified.
• Clear written and spoken English.

Nice to have:

• HL7 v2, FHIR, DICOM, or hands-on work with an HIS.
• PHPStan and Psalm.
• Fluency with the failure modes of distributed integration: partial delivery, duplicates, ordering, silent schema drift.
• Experience working with JIRA and in an Agile/Scrum environment.
• Regulated-environment experience: medical devices, finance, or comparable.
• Productive use of AI coding assistants (Claude Code, Codex, or similar): you know where they genuinely accelerate work and where their output needs to be treated as a first draft, not a merge candidate.

Your tasks:

• Develop top-notch and maintainable software solutions, implementing modern engineering practices to ensure high product quality
• Engage in technical discussions to identify the best solutions and proactively propose innovative ideas
• Collaborate effectively with team members and management

What you can expect from us:

• Flexible working hours and a healthy work-life balance
• 24 paid vacation days per year + 11 public holidays + paid sick leave
• Fully remote cooperation (Ukraine or any EU country)
• PE accounting support (Cooperation is possible via Ukrainian PE (FOP) only)
• Modern equipment and a powerful laptop
• Flat structure with short decision-making cycles
• Direct collaboration with a German product company

IT компанія WorkTime з офісами у Канаді и Києві, шукає до себе в команду Senior PHP Developer у Київський офіс (Ремоут не розглядаємо наразі). Сфера діяльності компанії — розробка та продаж власного моніторингового софту.

Looking for a back-end web developer:

An active, experienced and motivated individual to fulfill the position in our company.

About the project:

The project is an employee monitoring software. In the current situation this is a highly demanded product and demand is growing. Our product is 20+ years on the market and we are focusing today on creating from the scratch its cloud edition. The goal is to replace all existing editions with one high quality web version. Back end server and database environment — Windows Server.

As the developer of this project you are expected to:

Demonstrate willingness to learn and to professionally grow.

Actively participate in the project development.

Demonstrate high quality coding style to support our goal of creating the new reliable, scalable and stable system.

Your main duty will be back-end development and your expertise will be needed during the system development and release stages.

If you have any experience in front-end development, this is a plus and is welcome.

Required knowledge:

PHP 7.4 - 8.2;

OOP (object-oriented programming);

Firebird, MSSQL (Knowledge of pure SQL), PDO, InterBase;

JavaScript, JQuery, HTML, CSS;

Rest API (JSON);

Git, GitLab;

Apache;

Php;

StormComposer.

Will be good:

Symfony 5 - 6;

PostgreSQL;

Docker;

XDebug;

Nginx;

UnitTest;

Ability to refactor code

More about the project:

The project is an employee monitoring software. In the current situation this is a highly demanded product and demand is growing. Our product is 20+ years on the market and we are focusing today on creating from the scratch its cloud edition. The goal is to replace all existing editions with one high quality web version. Back end server and database environment - Windows Server.

What we offer:

Compensation in USD,

Highly professional result-oriented environment,

New development project where you can apply and expand your skills fully,

Stable growing company, 20+ years on the market,

Job Description

Primary Backend Skills:

Framework: Deep expertise in the .NET 8 Framework, specifically for building Web APIs.
API Development: Solid experience creating and managing endpoints using GraphQL for .NET.
Data Access: Proficiency with Entity Framework for ORM.
Testing: Skills in writing unit tests for backend services using XUnit.
API Documentation: Experience using Swashbuckle to generate and maintain Swagger documentation.

Cloud & DevOps Experience:

Platform: In-depth knowledge of the Azure platform is required.
Containerization: Experience with Docker for creating and managing containerized applications.
Hands-on experience deploying microservices to Azure Container Apps.
Understanding of hosting frontend applications on Azure Static Web App.
Experience managing and interacting with Azure SQL Database.
Experience with NoSQL databases, specifically Cosmos DB.
Core Azure Services: Managing customer identity with Azure AD B2C, Using Application Insights for service monitoring, Experience with Azure API Management.

Preferred, Not Required Skills

Familiarity with our modern frontend stack is a strong plus. This includes: Core Technologies: React, Typescript, and Material UI. State Management & Data: Redux toolkit and Apollo Client for GraphQL.
Tooling: Experience with Vite as a build tool, Vitest for testing, and Zod for schema validation.
Navigation: Understanding of React Router.
Version Control: Proficiency with Git and GitHub.
Collaboration: Experience working with Jira and Confluence.
API Testing: Hands-on experience with Postman, particularly within a team workspace.
Development Environment: Experience with development tools like Eslint, Prettify (Prettier), and Husky is beneficial. While the choice of IDE is flexible, experience with
Visual Studio Code is preferred.

Job Responsibilities

Working in Scrum team and perform function of senior software developer doing software modules architecture, design, development, unit and integration testing and deployment.

Department/Project Description

Developing a cloud-based platform designed for managing latest generation of IoT devices.

The core part of the system provides a centralized location for remotely monitoring, upgrading, and configuring devices. It also offers an application marketplace, allowing users to deploy and customize applications for their devices.

At the moment it is extensively extending with services that deal with telemetry provided by the connected devices and services. These services are designed in two forms. First is the predefined set of data connectors and visualisation widgets, and the second is a framework that let customers to design own connectors and widgets.

Skill Category

.NET

Keyskills - Must Have

• .NET
• Azure
• GraphQL
• Entity Framework
• MS SQL Server

Requirements

• 2+ years of commercial experience with Python (Django, DRF, FastAPI)
• Strong knowledge of Python 3.8+
• Solid understanding of web technologies, REST APIs, and client-server communication
• Basic knowledge of React and understanding of frontend development principles
• Good knowledge of Docker and Docker Compose
• Basic understanding of deployment and CI/CD processes; experience with GitHub Actions or similar tools
• Confident Git skills, including reading and reviewing teammates code
• English – Intermediate level or higher (able to participate in technical discussions)

Responsibilities

• Develop and maintain backend applications using Python (FastAPI, Django, DRF)
• Design and implement new features and REST APIs based on business requirements
• Maintain, optimize, and improve the existing codebase for stability and performance
• Develop and maintain frontend features using React
• Participate in code reviews and contribute to improving code quality and development processes
• Assist with deployments, CI/CD pipelines, and basic DevOps tasks

Nice to Have

• Ability to work independently while actively participating in team discussions and brainstorming sessions
• Experience with AWS infrastructure and cloud services

About Us

Smart Capital Center is an end-to-end, AI-powered platform for Commercial Real Estate (CRE) investment and financial management. We power real-time underwriting, asset management, and portfolio analytics through a combination of live data, workflow automation, and AI-driven insights.

Operating at the intersection of Generative AI, finance, and real estate, we are building systems that digitize and simplify complex financial workflows.

Our clients include leading institutions such as JLL, Pacific Life Insurance Company, and KeyBank. We are a lean, high-performance team building category-defining technology in a $17 trillion industry.

To learn more about our platform and vision, please visit our website.

The Role

We are looking for a Backend Software Engineer with strong experience in building scalable systems and a deep interest in AI-powered applications.

This is a high-impact, hands-on role where you will design and build backend services, integrate AI capabilities, and develop intelligent, agent-driven workflows used in real-world production environments.

You will work closely with product, AI, and engineering teams to deliver reliable, high-performance systems and automation features.

What You Will Do

Backend Development

• Design, build, and maintain backend services using Java (Spring Boot) and Python
• Develop scalable APIs and microservices for data-intensive applications
• Optimize system performance, reliability, and scalability
• Design efficient data models and handle complex integrations

AI & Intelligent Systems

• Implement and integrate AI-powered features into core products
• Design and build agent-based workflows for automation and decision-making
• Apply prompt engineering techniques to improve LLM outputs and behavior
• Work with modern AI frameworks to productionize intelligent systems

Cloud & Infrastructure

• Develop and deploy backend systems on AWS (EC2, S3, RDS, Lambda, etc.)
• Build resilient, scalable cloud-native services
• Contribute to system monitoring, logging, and reliability

System Design & Engineering Excellence

• Contribute to architecture, service boundaries, and system design decisions
• Write clean, maintainable, and well-documented code
• Ensure security, performance, and operational stability
• Continuously improve engineering quality and development practices

Collaboration

• Work closely with frontend, product, and AI teams
• Contribute to end-to-end feature delivery
• Participate in Agile development processes

Requirements

• 5+ years of backend software development experience
• Strong experience building and scaling backend systems in production

Core Technical Skills

• Strong experience with Java and Spring Boot
• Solid experience with Python
• Strong knowledge of SQL and database design (PostgreSQL preferred)
• Experience building REST APIs, microservices, and distributed systems
• Hands-on experience with AWS (EC2, S3, RDS, Lambda, etc.)
• Proficiency with Git and modern development workflows

AI & Modern Development Experience

• Experience with prompt engineering for LLM-based systems
• Practical experience building AI agent workflows in production
• Familiarity with frameworks/tools such as:
  • LangGraph
  • LangChain
  • LangSmith
  • or similar ecosystems
• Experience using AI-assisted development tools, such as:
  • Claude Code
  • Codex
  • OpenCode
  • or similar

Nice to Have

• Experience with vector databases or semantic search (e.g., Milvus)
• Knowledge of RAG (Retrieval-Augmented Generation) architectures
• Experience with CI/CD pipelines and DevOps practices
• Familiarity with event-driven architecture

• Experience with data processing pipelines or document AI systems

   

Why Join Us

• Work on cutting-edge AI-powered systems in a $17T industry
• Build real-world applications using LLMs, agents, and automation
• High ownership and autonomy with meaningful technical impact
• Opportunity to influence system design and engineering direction
• Fast-moving, execution-focused team with minimal bureaucracy
• Competitive compensation and flexible work environment

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 a Senior 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.

Responsibilities:

Core Development:

• Design and implement core backend services and data pipelines
• Write clean, readable, and maintainable code
• Develop services for the b2b product line

Architecture & Documentation:

• Actively participate in developing and improving architecture
• Document architectural decisions and operational knowledge for successful deployment and service operations

Quality Assurance:

• Ensure appropriate test coverage with unit and integration testing
• Focus on performance and cost efficiency for areas of responsibility
• Follow best practices in software design and development and promote them within the team

Operations & Monitoring:

• Ensure reliable alerting, dashboards, and runbooks for production services
• Debug production issues, analyze complex cases, and conduct investigations

Collaboration & Culture:

• Work smoothly in a technical culture with testing, CD, and DevOps

• Collaborate within the team and with other engineering teams to develop new features and products according to business needs

   

Requirements:

• Java: 3+ years of professional backend development in enterprise environment
• Kotlin: Knowledge and practical work experience
• Java Concurrency: Strong understanding and practical application experience
• Understanding of SOA, microservice, and event-driven architecture
• Cloud development principles with practical AWS experience

• Ability to scale and ensure high availability of loaded systems

   

Required:

• Any NoSQL database
• Any message broker
• Enterprise-grade stack (messaging brokers, in-memory storages, NoSQL, key-value databases)
• Docker and Kubernetes (containerized applications)

• Git, Gradle, Jenkins

   

Nice to Have:

• Redis, Netty, Akka, gRPC, Project Reactor, NATS, Kafka. MongoDB

• Strong knowledge of unit testing and automated test paradigms

   

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.

We are looking for an AI-First Golang Team Lead for one of our product engineering pods: a hands-on engineer who uses AI to ship fast and acts as the face of their pod towards clients and leadership.

⚠️IMPORTANT: This is not a traditional coding role. You’ll use Claude Code and other AI tools to 10x your output, always thinking about how the product or feature you are working on benefits the user. Also: we have no QA team, you OWN the quality of what you ship!

🧭About this role: every engineer on the team already owns their work end-to-end (IC + DRI). Everyone in the pod is, in effect, their own architect and lead developer. So this role is not about being the strongest techie in the room or telling people how to build.

A Team Lead is the spokesperson, coordinator, and facilitator for their pod, internally with product, design, and leadership, and externally with clients. You come from the management path, not the deep-specialist path: you have seen a lot as a developer and have consciously decided that enabling a team, working with clients and driving product outcomes is what energizes you now, not coding all day.

You remain a hands-on engineer. Expect roughly 30-40% of your week on coordination, client and product work, and the rest as an individual contributor. This is not an HR-style people-management role: no performance reviews, no career coaching. As we scale, light one-on-ones and check-ins may become part of it, but the job is coordination and delivery, not administration.

🧑 💻 What you’ll actually do:

• Be the spokesperson for your pod, internally with product, design, and leadership, and externally with clients and partners.
• Coordinate work across the pod: break initiatives into chunks, sequence them, surface blockers, and facilitate hand-offs (lightweight project management; we deliberately have no project managers).
• Gather client requirements first-hand and funnel them straight into the pod so nothing gets lost in translation.
• Represent your pod in product planning sessions and bring a strong product-driven point of view to scoping and trade-offs.
• Help pod members with product decisions and prioritization, enabling engineers who may be technically stronger than you.
• Contribute hands-on as an engineer: own features end-to-end, use Claude Code to generate Golang backend code, review AI output for quality and architectural fit.
• Join client meetings to align on requirements, report on delivery, and keep the relationship professional and calm.

📚 Our stack:

• Backend: Go monorepo (no framework, 3+ services).
• Hosting: PaaS-managed containers; local setup fully mirrors production via Docker Compose.
• Tools: Jaeger tracing, Betterstack (Logging, Alerting), Redis Asynq queue.
• Databases: PostgreSQL, Redis.
• AI tooling: Claude Code (mandatory).

🚢 Products you will lead a pod on:

• An AI search & recommendation engine for major travel enterprises: heavy client integration work (SSO, security reviews, GDS integrations) with demanding enterprise customers.
• A content enrichment API: high-scale, data- and AI-focused backend work.
• Partner and supplier integrations, data ingestion pipelines, LLM providers.

✅ You must have:

• 2-3+ years of technical leadership experience leading a team, squad, pod, or similar unit (a hard must; think team lead or early-stage engineering manager).
• A developer’s background (minimum 5 years): you have seen production reality with your own hands before moving towards leading people.
• A genuinely product-driven mindset: you think about user value and business outcomes before implementation.
• Comfort facilitating and coordinating a pod without relying on formal authority.
• Willingness and ability to take part in client meetings and act as the external face of your pod.
• Excellent spoken and written English for planning sessions, stakeholder updates, and client conversations.
• Ownership mentality with a strive for elegantly simple, high-quality solutions; you test your own work thoroughly since we have no QA team.
• Proven experience using Claude Code; share specific examples.
• Solid Golang experience; you’ll review AI’s code, and you must understand how it works.
• Ability to do on-call once in a while to help maintain our platform’s reliability & uptime.
• ⚠️ European or African timezones (±3 hours from CET).
• Available full-time (40 hours/week).

❤️ You are a great fit if you:

• Made the classic developer’s fork-in-the-road decision: lifelong engineer or leading people, and chose people, clients, and product.
• Are energized by product planning sessions and have opinions about what the pod should build next, not just how.
• Are comfortable being the face of your pod, in internal planning rooms and on calls with enterprise clients.
• Enjoy enabling engineers who are technically stronger than you.
• Ship fast but always verify it actually works; think “how can AI build this?” as your first instinct.
• Get frustrated when development takes weeks instead of days.

‼️Things to consider before applying that won’t be a match:

• This would be your first leadership role.
• You see the lead as the chief architect who makes the technical decisions for the team.
• You are looking for an HR-focused people-management role built around performance reviews and career coaching.
• You want to lead a team without staying hands-on in the codebase.
• You would rather not take part in client meetings or stakeholder-facing conversations.
• You prefer to focus on execution and leave product planning to others.
• You rely on formal authority to get a team moving.
• You have never used Claude Code or similar AI coding tools.
• You are outside European/African timezones.