Jobs Backend

We are looking for an experienced Rust developer to conduct technical interviews for software engineering candidates. As a Freelance Rust Interviewer, you will evaluate candidates’ practical knowledge of the Rust language, systems programming concepts, and real-world problem-solving skills. You will provide clear, structured feedback that helps hiring teams make informed decisions.

Key Responsibilities

• Conduct live technical interviews (video) focused on Rust
• Assess candidates on:
  • Core Rust language features (ownership, borrowing, lifetimes, traits, generics, etc.)
  • Memory safety, concurrency, and performance considerations
  • Common crates and ecosystem knowledge (tokio, serde, clap, etc.)
  • Systems programming, embedded, or backend/web contexts as relevant
  • Code quality, testing practices, and debugging approach
• Design or adapt technical questions, coding exercises, and system-design style discussions suitable for different seniority levels
• Provide written feedback and scoring shortly after each interview
• Maintain a professional, fair, and candidate-friendly interview experience
• Occasionally help refine the interview process or question bank

Requirements

• Strong, hands-on experience with Rust (preferably 3+ years of professional use)
• Solid understanding of systems programming concepts and the Rust ecosystem
• Previous experience conducting technical interviews or mentoring is a strong plus
• Excellent communication skills in English (written and spoken)
• Ability to evaluate candidates objectively and give constructive feedback
• Reliable availability for scheduled interviews (flexible hours preferred)
• Comfortable working independently in a remote freelance setting

Nice to Have

• Experience interviewing for senior or staff-level roles
• Familiarity with common interview platforms (CoderPad, HackerRank, Zoom, etc.)
• Background in concurrent systems, networking, embedded, or high-performance applications
• Contributions to open-source Rust projects or public technical writing

What We Offer

• Flexible freelance schedule
• Competitive pay per interview or hourly
• Opportunity to work with multiple clients / hiring teams
• Exposure to a wide range of Rust use cases and talent levels
• Professional, low-overhead collaboration

Project description

Our client is a technology company specializing in smart building and energy management solutions. Their platform enables organizations to monitor, control, and optimize building operations, including HVAC, lighting, power, and other building systems, improving energy efficiency and operational performance.

Important: Australian time zone, working hours from 8:00 AM UA.

Key Responsibilities:

• Leading and mentoring the development team, providing technical guidance and supporting engineers' professional growth;
• Collaborating with Product Owners, Architects, QA, and other stakeholders to define technical solutions and project roadmaps;
• Driving technical design and architecture decisions, ensuring scalability, maintainability, and security of the solution;
• Planning and coordinating development activities, prioritizing technical work, and managing delivery risks;
• Ensuring adherence to coding standards, development best practices, and quality assurance processes;
• Identifying and resolving technical blockers, supporting the team in troubleshooting complex issues;
• Contributing to estimation, sprint planning, and release planning activities;
• Promoting continuous improvement by introducing new tools, technologies, and engineering practices.
• Writing code, conducting code reviews, creating and maintaining technical documentation

Requirements:

• 7+ years of commercial experience in Back-End development, including experience in a Lead or Technical Lead role;
• Expert knowledge of JavaScript and TypeScript;
• Strong experience with AWS Cloud services;
• Expert knowledge of Express.js and NestJS frameworks;
• Strong experience with MongoDB;
• Experience with Jest for unit and integration testing;
• Strong experience in REST API design and implementation;
• Experience working with streaming platforms (e.g., Kafka) and message brokers (e.g., RabbitMQ);
• Experience with Swagger for API documentation;
• Strong understanding of system design, including scalable and distributed architectures.
• Experience of working with a high volume of data
• Experience with MQTT;
• Upper-Intermediate level of English;

Nice to have:

• Experience with ClickHouse;
• Experience with DynamoDB;
• Experience working with time-series data;
• Experience in IoT projects;
• Front-end development experience is a strong plus.

This is a supportive role for an experienced professional with an estimated occupation of around 10-20 hours a month. The candidate should be available on short notice. 

The goal is to support the client's WordPress website. This is a legacy project that requires maintenance and support first. 

Required skills:

- Significant experience with WordPress for complex solutions

- Experience working in multiple WordPress plugins

- Experience with the Avada theme

- Capability to support the website, including hosting and performance optimization decisions

Description:

We are looking for a Middle Python Developer to join the team responsible for developing and deploying new features for the DataOps Platform, which powers millions of customer workloads every month.

The ideal candidate must have hands-on experience using GitHub Copilot or similar AI-powered development tools as part of their daily development workflow. The role requires leveraging AI to improve coding efficiency, code quality, debugging, documentation, and software delivery.

 Join our vibrant AI Team as a Software Engineer working on Qlik’s Cloud-based AI/ML components. We
believe in the power of data — and increasingly, the power of agentic AI — to change the world. In this role
you will build and support features that combine traditional full-stack engineering with modern AI-assisted and
agentic development practices, including MCP (Model Context Protocol) tooling, AI coding assistants, and
agentic workflows that extend our platform’s ability to solve complex customer problems

Requirements:

• A bachelor’s or master’s degree in computer science (or equivalent).
• Overall 4+ years of experience with 1-2 years of backend development experience, preferably in product development teams.
• Strong, hands-on Python programming experience — required.
• Experience developing MCP servers — designing tools/resources and implementing the server-side protocol — not just configuring or consuming existing ones.
• Practical experience using AI coding assistants such as GitHub Copilot, Gemini, or Claude Desktop.
• Experience designing or implementing agentic workflows (agentic-loop patterns) — e.g., tool-use,
  planning/orchestration, and iterative reasoning loops.
• Solid understanding of DevOps practices and tools (e.g., Docker, Kubernetes, Jenkins, AWS, Azure, etc.).
• Proven experience in full-stack web development (React, Angular, or Vue.js for front-end; Django, Flask,
  or FastAPI for back-end).
• Familiarity with version control systems (e.g., Git).
• Strong problem-solving skills and the ability to troubleshoot issues across the stack.
• Ability to learn, work with, and apply multiple technologies to solve real customer problems. Strong
  communication, analytical, and interpersonal skills with the ability to work across geographically dispersed
  teams.
• We would be thrilled to have a teammate with:
• Experience working with on-premises (on-prem) infrastructure and deployments.
• Added bonus: hands-on experience with Qlik Sense Enterprise (on-prem version).
• Experience with Qlik products or any other Business/Data Analytics products.
• Knowledge of AI/ML technologies — e.g., LLMs, RAG, vector databases, prompt engineering, and chain-
  of-thought agents.
• Passion for learning emerging technologies

Job responsibilities:

1. Feature & Software Development

• Design, implement, troubleshoot, and debug software features across the full stack.
• Collaborate with peers to design and build new features that meet customer needs and enhance user
experience.

2. MCP Server & Agentic Development

• Design and develop MCP (Model Context Protocol) servers— not just configuring or using
existing ones — to expose Qlik’s capabilities to AI tooling and agents.
• Design and implement agentic workflows (agentic-loop patterns) — tool-use, orchestration, and
iterative reasoning.
• Maintain, extend, and harden MCP servers already in production.

3. Collaboration and Communication

• Partner effectively with colleagues in Development, SRE, and Product Management throughout the
software development life cycle.
• Contribute to the analysis, design, and implementation of service improvements.
• Communicate clearly and work effectively with geographically dispersed teams across CET working
hours.

4. Continuous Improvement

• Set the bar for performance, reliability, and quality standards within the team.
• Strive for fully automated solutions and high-quality code, including AI-assisted development
practices.
• Stay current with emerging AI, agentic, and MCP-ecosystem technologies and best practices.

5. Team Collaboration and Planning

• Participate in planning sessions with the team, contributing insights and ideas to drive future work
and product improvements.

Are you ready to take ownership of mission-critical backend systems in a high-load, transaction-heavy environment? 

We are looking for a Senior Java Developer to join our Payments Domain team in Warsaw.

This is a hybrid role with 3 days per week in the office, giving you the perfect balance between collaboration and flexibility. 

At Sigma Software, we value engineering excellence, multicultural teamwork, and delivering secure, high-performance solutions.

Why join us? You’ll work on a platform processing millions of transactions daily, contribute to architectural decisions, and be part of a company where innovation and ownership are encouraged.
 

Customer

Our customer is a well-established international company in the iGaming industry, known for its engineering-driven culture and multicultural team distributed across multiple countries. Operating multiple brands across various markets, the company delivers secure, high-performance digital platforms recognized for reliability and scalability.
 

Project

You will be part of the Payments Domain team, responsible for developing and maintaining a large-scale payments platform built on modern microservices architecture. The platform processes millions of secure transactions daily, supporting multiple brands and geographies. The work focuses on scalability, reliability, and performance in a high-load environment, covering everything from integration with payment providers to transaction monitoring and compliance.

Requirements:

• 5+ years of commercial experience with Java and Spring Boot
• Strong experience with MySQL and Kafka
• Proven track record working with microservices architecture in high-traffic, high-load systems
• Experience developing high-performance backend solutions for transaction-heavy platforms
• Ownership mindset with the ability to deliver services end-to-end
• Excellent communication skills in English (C1 level), both written and verbal
• Experience with Kotlin
   

Responsibilities:

• Design, develop, and maintain backend services for the payments platform using Java and Spring Boot
• Ensure high availability, scalability, and performance of transaction processing systems
• Collaborate with cross-functional teams to define technical requirements and deliver solutions end-to-end
• Implement integrations with payment service providers and internal systems
• Participate in architectural discussions and contribute to system evolution in a microservices environment
• Monitor, troubleshoot, and optimize services in production
• Ensure compliance with security, regulatory, and operational standards
• Drive continuous improvement in code quality, testing, and deployment practices

Чи готові ви взяти на себе відповідальність за критично важливі backend-системи у високонавантаженому середовищі з великою кількістю транзакцій?

Ми шукаємо Senior Java Developer до команди Payments Domain у Варшаві.

Це hybrid-роль із відвідуванням офісу 3 дні на тиждень, що забезпечує баланс між командною співпрацею та гнучкістю.

У Sigma Software ми цінуємо інженерну досконалість, мультикультурну командну роботу та створення безпечних високопродуктивних рішень.

Чому варто приєднатися? Ви працюватимете над платформою, яка щодня обробляє мільйони транзакцій, братимете участь у прийнятті архітектурних рішень та станете частиною компанії, де заохочуються інновації та відповідальність за результат.

Клієнт

Наш клієнт — міжнародна компанія у сфері iGaming із сильною engineering-культурою та мультикультурною командою, розподіленою між кількома країнами. Компанія керує кількома брендами на різних ринках і створює безпечні високопродуктивні цифрові платформи, відомі своєю надійністю та масштабованістю.

Проєкт

Ви станете частиною команди Payments Domain, відповідальної за розробку та підтримку масштабної платіжної платформи, побудованої на сучасній мікросервісній архітектурі. Платформа щодня обробляє мільйони безпечних транзакцій, підтримуючи різні бренди та географії. Робота зосереджена на масштабованості, надійності та продуктивності у високонавантаженому середовищі — від інтеграції з платіжними провайдерами до моніторингу транзакцій і забезпечення відповідності вимогам.

Вимоги:

• 5+ років комерційного досвіду з Java та Spring Boot 

• Впевнений досвід роботи з MySQL та Kafka 

• Підтверджений досвід роботи з мікросервісною архітектурою у високонавантажених системах 

• Досвід розробки високопродуктивних backend-рішень для платформ із великою кількістю транзакцій 

• Ownership mindset та здатність вести сервіси end-to-end 

• Відмінні комунікаційні навички англійською мовою (рівень C1), усно та письмово 

• Досвід роботи з Kotlin

Обов’язки:

• Проєктування, розробка та підтримка backend-сервісів платіжної платформи з використанням Java та Spring Boot 

• Забезпечення високої доступності, масштабованості та продуктивності систем обробки транзакцій 

• Співпраця з кросфункціональними командами для визначення технічних вимог і реалізації рішень end-to-end 

• Реалізація інтеграцій із платіжними провайдерами та внутрішніми системами 

• Участь в архітектурних обговореннях і розвиток системи в мікросервісному середовищі 

• Моніторинг, troubleshooting та оптимізація сервісів у production 

• Забезпечення відповідності вимогам безпеки, регуляторним та операційним стандартам 

• Постійне вдосконалення якості коду, тестування та процесів деплою

Full-Stack Engineer - TypeScript / Next.js / Node.js

We are looking for a Strong Middle / Middle+ Full-Stack Engineer to join an existing AI SaaS product and work directly with the CTO.

What you’ll do

• Develop and maintain frontend and backend features
• Work with TypeScript, Next.js, PostgreSQL, and Prisma
• Implement Stripe billing, subscriptions, plans, and usage limits
• Improve performance, security, monitoring, and platform stability
• Work with background jobs and asynchronous workflows

• Review the existing implementation and suggest practical improvements

   

Requirements

• 5-7 years of commercial experience
• Strong TypeScript and Next.js/React
• Solid backend and API development experience
• Strong knowledge of PostgreSQL
• Experience with ORM, ideally Prisma
• Experience with production SaaS products
• Ability to work independently with an existing codebase
• Professional English and good CET working-hours overlap

• Availability to start within 1.5–2 weeks

   

Nice to have

Experience with Stripe, tRPC, rate limiting, background jobs, Sentry, Vercel, Tailwind, shadcn/ui, security practices, or AI/LLM integrations.

We’re looking for a practical product engineer who can balance clean engineering with the speed of an early-stage startup.

We are looking for a Senior .NET Engineer to join our team and work on a SaaS platform for the hospitality industry. The product helps restaurants manage reservations, customer relationships, and online bookings while ensuring high availability and performance.
Requirements

• 7+ years of commercial experience with .NET / C#
• Strong experience with ASP.NET Core and Entity Framework Core
• Hands-on experience with Microsoft Azure (App Services, Functions, Azure SQL, Cosmos DB, Service Bus, Application Insights, Key Vault)
• Strong knowledge of SQL Server, query optimization, and database performance tuning
• Experience with REST APIs and distributed systems
• Experience with Git and CI/CD pipelines
• Strong troubleshooting and production support skills
• Experience working with cloud-based applications in production
• Experience using AI development tools (GitHub Copilot, Cursor, Claude Code or similar)
• Upper-Intermediate English or higher

Would be an asset

• Experience with Kubernetes (AKS)
• Experience with payment integrations
• Experience with high-load SaaS products
• Experience modernizing legacy .NET applications

Responsibilities

• Develop and maintain backend services and APIs
• Monitor, troubleshoot, and resolve production issues
• Optimize application and database performance
• Deploy and maintain cloud infrastructure on Azure
• Upgrade frameworks, libraries, and Azure services
• Integrate third-party services and payment providers
• Collaborate with international teams and participate in code reviews
• Share knowledge and contribute to technical documentation

We’re hiring an experienced Senior Python Backend Engineer / Technical Lead for a long‑term engagement. This is a full‑time contract role available only to candidates legally resident in the European Union.

Important: the contractor will receive company equipment. During onboarding we will verify identity and EU residency — only candidates able to provide valid documentation will be considered.

What you’ll do

• Develop and maintain production‑grade backend systems using Python.
• Design service architecture for high‑throughput, parallel processing, and reliability‑sensitive systems.
• Build microservices, REST APIs, backend integrations, and data‑processing components.
• Make technical decisions on scalability, fault tolerance, application security, and performance.
• Own assigned functionality end‑to‑end: technical design, estimation, implementation, testing, and release.
• Collaborate closely with Product, Architecture, QA, Infrastructure, and DevOps teams.
• Maintain engineering quality through code reviews, automated tests, and CI/CD practices.
• Mentor less experienced engineers and contribute to shared backend architecture and development standards.

Must‑have

• 6+ years of commercial software development experience with Python as a primary technology.
• Deep Python knowledge: OOP, asynchronous programming, design patterns, concurrency, and performance optimization.
• Proven experience designing and building distributed backend systems and microservice architectures.
• Strong hands‑on experience with at least one Python web framework: FastAPI, Flask, or Django.
• Solid track record building and maintaining RESTful APIs.
• Practical understanding of high‑load architecture, scalability, resiliency, and secure software development.
• Strong database skills (PostgreSQL or SQL Server) and experience with NoSQL solutions.
• Production experience with Docker and Kubernetes.
• Hands‑on experience with Microsoft Azure, Azure DevOps, and automated CI/CD pipelines.
• Ability to independently drive technically complex tasks and make sound architectural decisions.
• Experience working in Agile teams.
• Strong communication, code review, and mentoring skills.
• Degree in Computer Science, Software Engineering, or a related technical field.

Nice‑to‑have

• Commercial experience with Generative AI or LLM‑based products.
• Familiarity with RAG architectures, AI agents, or agentic workflows.
• Experience integrating AI capabilities or workflow automation into backend platforms.

📍 EU Only | 🕐 Full‑Time | 📅 12+ Months

🚀 Who we are:

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

📍 About the Product:

We are building an AI-first platform that fuses multiple maritime data sources into a unified operational picture. The system builds a digital twin of global maritime activity, applies behavioral analytics and predictive AI models to surface smuggling, illegal fishing, container risk, and other compliance or security threats, and presents mission-grade intelligence to both commercial and government stakeholders. 

Operating at global scale, the platform processes millions of events and terabytes of geospatial data daily. 

About the Role:

You will join an autonomous team building agentic AI capabilities within a production-grade maritime intelligence platform.

As a Senior AI Engineer, you will design, build, and deploy production-grade AI systems powered by LLMs, autonomous agents, and retrieval-augmented generation (RAG). You’ll work across the full AI application lifecycle – from experimentation and prompt engineering to scalable deployment, evaluation, monitoring, and continuous improvement.

You’ll collaborate closely with platform engineers, researchers, and product teams to transform AI prototypes into reliable, secure, and scalable production systems.

📍 Key Responsibilities:

• Design, build, and deploy production-grade AI applications using LLMs, RAG, and agentic workflows.
• Build and optimize autonomous AI agents capable of planning, using tools, making decisions, and solving complex operational tasks.
• Integrate foundation models and LLM APIs into scalable systems, including retrieval pipelines, vector search, prompt orchestration, and AI memory.
• Develop AI evaluation and observability frameworks, including hallucination detection, trace analysis, model performance monitoring, experimentation, and continuous improvement.
• Build scalable Python backend services and integrate AI capabilities with distributed production systems.
• Collaborate with research and product teams to productionize new AI capabilities, taking them from experimentation to reliable real-world use.
• Own technical decisions and drive AI engineering best practices, including architecture, testing, tooling, deployment, and AI-SDLC standards.

📍 Required Competence and Skills:

• 7+ years of software engineering experience, including at least 1.5 years of hands-on experience building production AI applications, with proven experience delivering agentic AI systems used by real users.
• Strong software engineering background in Python or another backend language (Golang, Rust, TypeScript, Java, etc.), with the willingness to work primarily with Python. 
• Hands-on experience building agentic AI systems using frameworks such as LangChain, LangGraph, CrewAI, DeepAgents, OpenClaw, Hermes, or similar.
• Experience deploying and operating production AI services in cloud environments, with a proven track record designing scalable, event-driven architectures using messaging (SQS/SNS) and SQL/NoSQL databases. AWS experience is preferred.
• Experience integrating AI agents and AI-powered capabilities into production applications through GraphQL or REST APIs.
• Experience taking AI applications from development to production and collaborating with platform engineering teams on deployment and operation using Kubernetes and Terraform.
• Experience ensuring production AI systems are reliable, secure, observable, and ready for mission-critical use, including monitoring and incident response.
• Excellent communication skills, autonomy, and accountability in ambiguous, high-velocity environments.

Nice to Have:

• Experience with React.js and full-stack development, with the ability to contribute to frontend development when needed.
• Experience with vector databases and similarity search in production AI applications.

Why Us:

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

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

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

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

We are looking for a strong Rust developer to join our trading technology team and build high-performance systems for market making and liquidity provision. You will design, implement, and optimize low-latency components that power our automated market-making strategies across crypto, FX, or traditional markets.

What You’ll Do

• Design and implement low-latency market-making engines and liquidity provision logic in Rust
• Build and optimize order management, risk checks, inventory management, and quoting systems
• Develop high-performance connectivity to exchanges (REST, WebSocket, FIX, or proprietary protocols)
• Work on real-time data pipelines, market data handlers, and state management
• Profile and optimize for latency, throughput, and memory usage
• Collaborate with quant researchers and traders to productionize strategies
• Improve reliability, observability, and fault tolerance of the trading stack
• Participate in code reviews, architecture discussions, and continuous improvement of the codebase

Requirements

• Strong proficiency in Rust (ownership, async, concurrency, unsafe when justified, performance-critical code)
• Experience building low-latency or high-throughput systems (trading, HFT, market making, or similar domains preferred)
• Solid understanding of market microstructure, order books, market making, and liquidity provision concepts
• Experience with networking (TCP, WebSockets, FIX) and binary protocols
• Familiarity with concurrency primitives, lock-free structures, and performance profiling tools
• Strong computer science fundamentals (algorithms, data structures, systems programming)
• Comfortable working in a fast-paced, production trading environment

Nice to Have

• Prior experience in market making, prop trading, or crypto/DeFi liquidity provision
• Knowledge of exchange APIs (CEX or DEX)
• Experience with time-series data, order book reconstruction, or simulation frameworks
• Familiarity with risk management systems or position/inventory controls
• Exposure to C++ or other systems languages (helpful for interop or legacy systems)
• Experience with monitoring/observability stacks (Prometheus, Grafana, etc.)

What We Offer

• Competitive compensation + performance-based upside
• Opportunity to work on production market-making systems with real impact
• High-ownership role with direct influence on architecture and performance
• Collaborative team of engineers, quants, and traders
• Flexible remote/hybrid work

Workload: Full-time
Start: ASAP
Duration: Long-term (3+ years)
Location: open
English: B2+

Key Requirements & Technical Stack
Core Task: Integration with a 30-year-old legacy healthcare system and rewriting legacy screens into modern UI.
Database & Legacy: Deep hands-on experience with Oracle ADF and PL/SQL.
Modern Backend: Java / Spring (thin service layer architecture).
Frontend: React (rewriting screens from scratch).
Role Focus: Technical leadership/execution on legacy decoupling, data integration, and UI modernizing.

(candidates only with white-label CVs explicitly showing experience with Oracle ADF/PL/SQL and React!)

Softcery builds advanced AI systems for B2B SaaS companies. We partner with founders in the US and UK to design, build, and scale production-ready AI solutions that solve real business challenges. Our team focuses on complex AI engineering — systems that are technically robust, business-aligned, and built to scale. We combine deep technical expertise with strong product thinking, helping companies move from AI ambition to real, production impact.

We are looking for a Strong Middle Software Engineer to lead the delivery of AI-powered products for international clients. You'll work on complex AI systems with a strong focus on Voice AI, collaborating directly with clients and taking ownership of features from design to production. 

We're hiring in Lviv, where most of our team is located. We regularly get together for offline meetings, so it's important for us to have someone who enjoys being part of those in-person connections. 

    What You'll Do:

• Deliver production-ready AI solutions for international clients from concept to deployment.
• Design and build AI-powered applications with a strong focus on Voice AI and intelligent automation.
• Integrate LLMs, third-party APIs, and business systems into scalable software solutions.
• Own technical implementation, make architectural decisions, and ensure high code quality.
• Collaborate directly with clients to clarify requirements, discuss technical solutions, and deliver business value.
• Continuously explore new AI technologies and apply them to real-world customer challenges.
  
  What We're Looking For:
• 3+ years of commercial experience in Python development.
• Hands-on experience with developing AI-powered applications.
• Strong software design and problem-solving skills.
• Ability to independently own features and deliver projects with minimal supervision.
• Excellent communication skills and confidence working directly with international clients.
• English – Advanced (C1).
• Location – Lviv.

    Will be a plus:

• Experience with React and Node.js.

  
  What We Offer:

• Structured onboarding – a clear onboarding plan, documented workflows, and a team that has your back.
• Flexible remote schedule – work from wherever and whenever you're most productive.
• Learning budget – we cover books, courses, English lessons, and AI tools for your professional growth.
• Full accounting support – so you can focus on the work, not the paperwork.
• Time off – 20 paid vacation days, 12 sick days, 2 paid period leave days/month (for women), and your birthday off.
• IT Cluster membership – access to professional events and networking opportunities in the local tech community.

If you enjoy taking ownership, solving complex engineering challenges, and building AI products that create real business impact, we'd love to meet you 👋

About the Client

Our client is transforming the world of alternative investments, making them accessible to a broader range of investors. Traditionally, private funds and other alternative assets have been available only to institutional players due to their complexity and regulatory barriers. They change that by providing a cutting-edge platform that simplifies access, management, and distribution of these investment opportunities.

About the Role

As a Senior Scala Engineer, you’ll be part of the team building the core backend systems that power the client’s investment platform. Your mission will be to design and develop high-performance, scalable, and reliable distributed services that enable seamless data flow and financial transactions at scale.

You’ll contribute to the architecture of microservices and real-time data pipelines, applying functional programming principles and leveraging technologies like Akka, Play Framework, and streaming frameworks such as Spark or Flink. Working closely with cross-functional teams, you’ll help shape technical direction and ensure the platform continues to deliver secure, robust, and efficient solutions for the global investment community.

Role Responsibilities:

• Develop and maintain robust backend systems using Scala, ensuring high performance, scalability, and reliability.
• Participate in designing distributed systems and microservices architectures. Contribute to decisions on frameworks, libraries, and best practices.
• Write clean, testable, and maintainable code. Promote functional programming principles and ensure code quality through code reviews and unit/integration tests.
• Identify bottlenecks and optimize application performance, scalability, and fault tolerance.

Role Requirements:

• 4+ years working with Scala
• Hands-on experience with SQL and NoSQL databases (e.g., PostgreSQL, Cassandra, MongoDB)
• Experience with functional programming paradigms
• Experience with Akka, Play Framework, or ZIO ecosystem
• Strong communication skills with English B2+ for direct cooperation with the client
• Project starter mindset with ability to work independently and take ownership in a changing environment.
• Strong curiosity to the fintech domain.

Nice to have:

• Experience in fintech, banking, or payment systems
• Knowledge of data streaming and real-time analytics
• Exposure to Big Data frameworks (Spark, Flink)

Interview Process

1. Intro Call with Recruiter (45 min)
2. Technical Interview (up to 60 min)
3. Client Interview (up to 60 min)

Looking forward to having a mutually interesting conversation with you!

Are you passionate about building secure, high-performance platforms? We are looking for a Senior Java Developer to join our team and work on a cutting-edge security platform. This is a remote role open to candidates across Europe and Ukraine.
At Sigma Software, we create innovative solutions for complex ecosystems, ensuring security, scalability, and compliance at every step. You will be part of a talented engineering group designing the unified access layer for distributed services.
Why join us? You will work on a mission-critical project with advanced security architecture, collaborate with skilled professionals, and contribute to a platform that supports global-scale operations.

CUSTOMER

Our customer is a leading EdTech company that uses AI and data-driven technologies to personalize learning experiences, optimize user engagement, and improve marketing effectiveness through advanced audience targeting and analytics.

PROJECT

The project focuses on developing a centralized platform access layer that combines API gateway capabilities, service orchestration, data composition, and fine-grained authorization mechanisms. The platform provides a secure foundation for governance across the ecosystem, supporting complex organizational hierarchies, regional compliance requirements, and consistent policy enforcement.

JOB DESCRIPTION 

• Design and evolve the platform access architecture for a large-scale distributed ecosystem
• Build and maintain a unified API layer over multiple distributed services
• Implement fine-grained ABAC authorization at scale, supporting complex hierarchies and relationships
• Develop fail-closed security architectures with strict enforcement guarantees
• Manage regional compliance, data residency, and routing requirements
• Ensure consistent data visibility rules across all products and services
• Design high-performance authorization evaluation systems and policy engines
• Maintain auditability, traceability, and security transparency mechanisms
• Collaborate with platform and product teams on API and access design
• Contribute to architectural decisions and security standards

QUALIFICATION

• At least 5 years of commercial software engineering experience
• Strong expertise in Java development
• Strong proficiency in Java 21+ and modern Java features, including virtual threads, NIO, and concurrent programming
• Hands-on experience building high-performance backend systems with a strong focus on scalability and low latency
• Experience working with GraalVM Native Image and optimizing Java applications for native execution
• Solid understanding of HTTP protocol internals, connection management, streaming, and API performance optimization
• Experience processing large volumes of JSON using streaming APIs and memory-efficient techniques
• Strong knowledge of performance tuning, profiling, benchmarking, and JVM optimization
• Experience designing and implementing caching strategies and cache invalidation mechanisms
• Solid understanding of authentication, authorization, and security best practices in distributed systems
• Experience building or maintaining API gateways, proxies, load balancers, service mesh components, or other infrastructure-level services
• Strong understanding of event-driven architectures and distributed systems design
• Experience writing comprehensive automated tests for performance-critical and protocol-level components
• Upper-Intermediate or higher English proficiency

WILL BE A PLUS

• Experience with Netty and high-performance networking applications
• Experience with service mesh technologies such as Istio, Envoy, or Dapr
• Hands-on experience with authorization frameworks such as OPA, Cedar, Zanzibar, or Oso
• Experience with Google Cloud Platform, including Pub/Sub, BigQuery, Memorystore, or Redis
• Experience deploying and operating applications on Kubernetes
• Familiarity with gRPC, Protocol Buffers, and HTTP/2
• Experience working in regulated domains such as Healthcare, Education, or FinTech
• Knowledge of jlink, AppCDS, CRaC, or other JVM optimization technologies

PERSONAL PROFILE

• Proactive and detail-oriented
• Thrives in collaborative environments
• Enjoys solving complex integration challenges
• Comfortable experimenting with new technologies
• Committed to improving data systems

We are looking for a Python Developer (Odoo) to join an international telecommunications company operating one of Europe’s largest private fiber-optic networks, connecting businesses across Europe, Asia, and the Middle East.
 

In this role, you’ll contribute to the development and evolution of the company’s internal ERP ecosystem based on Odoo. You’ll work on backend development, business process automation, system integrations, and ERP customization, collaborating with business stakeholders and engineering teams to build scalable internal solutions.
 

Our technology stack

Python, Odoo, JavaScript, PostgreSQL, SQL, REST APIs, XML, Git, Linux

Responsibilities

• Develop and maintain backend functionality using Python
• Customize and extend Odoo modules to support business requirements
• Build integrations between Odoo and internal or third-party systems using APIs
• Design and implement business logic to automate operational processes
• Optimize PostgreSQL queries and improve application performance
• Participate in system upgrades, maintenance, and continuous improvement of the ERP platform
• Troubleshoot production issues and ensure long-term platform stability
   

Requirements

• 4+ years of commercial Python development experience
• Experience with Odoo development or customization
• Experience working with JavaScript in Odoo or other web applications
• Strong knowledge of PostgreSQL and SQL
• Experience building REST APIs and integrations
• Understanding of OOP principles and software design patterns
• Ability to work independently in a distributed international team
• Upper-Intermediate English proficiency
   

Our hiring process

1. Screening interview with a recruiter (30 minutes)
2. Technical interview with the Tech Lead (1 hour)
3. Final interview with the client (1 hour)