Jobs Backend

Project Responsibilities

Design and build .NET 8 microservices — FastEndpoints, clean architecture (Domain / Application / Infrastructure / API layers) 
Implement Temporal workflow orchestration — typed workflow and activity interfaces, cross-task-queue dispatch, signal/query patterns 
Build rules evaluation integrations with GoRules ZEN engine (GoRules.Zen NuGet, Rust FFI in-process) 
Develop platform capabilities — config registry, rules API, workflow gateway, payment and policy adapters 
Implement cross-cutting concerns — Managed Identity service-to-service auth, Cerbos authorization integration, structured logging via Serilog/Anotar 
Write and maintain xUnit tests — FakeItEasy for mocking, Shouldly for assertions; integration tests against real dependencies (no mock DB) 
Collaborate with platform and domain teams on API contracts, OpenAPI specs, and shared NuGet libraries

Working hours - BST 

Must-haves

5+ years hands-on .NET (v6+) experience; .NET 8 required 
FastEndpoints 7.x — endpoint-per-feature pattern, validators, mappers 
Clean architecture — strict layer dependency rules; no business logic in API layer; no throw for business errors (Result<T,E> pattern) 
Temporal .NET SDK — ITemporalClient, IWorkflow, IActivity, task queue registration, cross-TQ dispatch 
Azure — Key Vault, Managed Identity, Blob Storage, App Insights 
Result/Maybe monad pattern — Result<TSuccess, TError> throughout Application layer 
Entity Framework Core or equivalent — migrations, value objects, aggregate roots 
Testing — xUnit, FakeItEasy, Shouldly; integration test patterns 
Podman CLI — build service image locally (podman build), run container (podman run), inspect logs, exec into container for debugging 
Read and contribute to Dockerfile (multi-stage build — SDK build stage + runtime stage) 
Run full local stack with Podman Compose (service + Temporal + DB)

Nice-to-have

GoRules ZEN engine — JDM format, ZEN expression language, decision table compilation 
Cerbos .NET client — principal/resource construction, CheckResource middleware integration 
JSONata .NET (Jsonata.Net.Native) for data transformation 
Kafka consumer patterns 
SOAP/WCF client integration

We are seeking a passionate Full-Stack Software Engineer with extensive experience in PHP and JavaScript who loves engineering and the product development process. You will be responsible for developing new features, integrating systems, and optimizing and modernizing the existing codebase.

The ideal candidate has experience in:

- PHP 8.X, multiple frameworks and libraries;

- JavaScript from vanilla JS to React and TypeScript;

- HTML, CSS, SCSS, post-processing, scaffolding systems;

- relational databases, DB schema, and query optimization;

- Linux, Docker, CI/CD, Bash;

- software engineering principles, architecture patterns, application scalability, and low-latency system availability;

- experience with cloud platforms such as Azure;

- problem-solving skills;

- communication and collaboration skills.

You will be responsible for:

- develop, architect, and maintain SaaS applications using PHP and its frameworks;

- implement the frontend using JavaScript/TypeScript (from vanilla JS to modern libraries and frameworks), HTML, and SCSS;

- create and maintain RESTful APIs (SaaS and Proxy APIs);

- design and optimize database interactions (PostgreSQL, AWS DynamoDB);

- write clean, testable, efficient, and maintainable code;

- test and debug code to ensure the reliability and performance of applications;

- collaborate closely with founders and service teams to deeply understand our customers and users.

Seniority:

- university degree (non-course/academy; only technical university education);

- minimum of 6+ years of actual experience (non «freelance», no gaps, counting ONLY years after a university degree);

- your years in IT don’t guarantee your seniority;

- the slope of your learning is MORE important than your total years in IT, but don’t kid yourself;

- this job vacancy is not for newcomers/juniors/entry/majority-mid level, one framework developer, and ONLY for product development folks.

The position is ONLY for Ukrainian citizens. We don’t consider outsourcing, out-staffing, freelancing, or man-in-the-middle schemes, or part-time work; we only hire Core Team Members to the Core Team.

We are looking for an experienced Senior Go Developer to design, build, and scale our next-generation slot engine from the ground up under high-load conditions (10k+ RPS).
 

Responsibilities

• Design and develop a high-performance, scalable slot engine from scratch
• Ensure mathematical precision, RNG integration, and absolute data consistency
• Analyze and refactor existing Node.js modules, with potential migration to Go
• Optimize and maintain high-load services handling 10k+ requests per second
• Work with PostgreSQL partitioning, Redis state management, and messaging systems
• Collaborate directly with the CTO and core engineering team
• Contribute to architectural decisions and technical strategy
   

Requirements

• 5+ years of backend development experience
• Strong expertise in Go and deep understanding of concurrency and performance
• Experience working with high-load distributed systems
• Experience with PostgreSQL, including complex transactions and optimization
• Experience with Redis and message brokers (RabbitMQ or similar)
• Strong understanding of ACID principles and data consistency
• Experience working with legacy systems and refactoring is a strong advantage
• Ability to work independently in a remote environment
   

Nice to Have

• Domain experience in iGaming (slot engine mechanics, math models, RTP calculations, or payout logic).
• Prior experience executing tech stack migrations (e.g., Node.js to Go).
• Familiarity with ClickHouse, Docker, Kubernetes (K8s), and AWS infrastructure.
   

Tech Stack

• Backend: Go 1.20+
• Legacy/Migration: Node.js
• Storage & Cache: PostgreSQL (Partitioning, ACID), Redis, ClickHouse
• Infrastructure & Messaging: RabbitMQ, Docker, Kubernetes, AWS

What we offer

• Fully remote format
• Opportunity to build new game products from scratch
• Direct collaboration with product stakeholders and decision-makers
• Fast decision-making and startup-like environment
• A chance to influence the future portfolio of instant and crash games

Please note that feedback on your application will be provided within two weeks if a positive decision is made regarding your candidacy.

We are a sports and entertainment representation database. Companies use it to find out who represents athletes and talent. We’re a small, data-heavy team, and our research team keeps hundreds of thousands of records current.

Our goal is to map the entertainment and sports industries: who represents whom, and how that changes over time. Our data is only valuable if it’s accurate, so accuracy comes before speed in everything we build.


*English needs to be good enough to have video meetings

The role
You’ll own two areas of work:

1. Our internal Python apps. These include Django apps that power member-facing data on our WordPress site, such as a festival lineup database and sports agency market share data, plus a Flask research tool our team uses daily for roster processing and verification. You’ll maintain, fix, extend and deploy them.

2. AI automations that save our research team time. For example, given a list of names, automatically find each person’s official social media accounts, the languages they speak, and other basic public information. Results come back with confidence scores, and a person reviews them before anything is saved.

    

Who thrives here
We’re a small company moving fast, and this role is for someone who wants that. You’ll be the developer on the team, not one of many, so what you build, fix or improve has a direct, visible impact.
 

• Strong work ethic. You take ownership of your work and see it through. When something breaks or a deadline is close, you stay with it until it’s done. Comfortable with working weekends if thats what it takes.
• Comfortable with pace and change. Priorities can shift week to week, sometimes because of a launch, a news cycle or a sports season. You adapt quickly without needing every detail planned in advance.
• Self-directed. No one will hand you a perfect spec every time. You ask the right questions, make sensible decisions, and keep work moving.
• Flexibility when it counts. Some deadlines, like a season launch or a major report, need extra hours, sometimes outside your usual schedule or on weekends. We need someone who’s willing to step up at those times.
   

How we work
We want a developer who thinks like an owner, not someone who waits to be assigned tickets. That means:
 

• Contributing to the product. Give input on our goals and suggest better ways to reach them. If you see a technical way to map the industry faster or more accurately, bring it to us.
• Taking initiative. Look for ways to move the project forward on your own: automating manual work, improving our tools, and fixing problems before they become ours.
• Treating accuracy as essential. Our team verifies large volumes of data every day. Help us build processes and tools that keep data accurate at scale, with checks and safeguards rather than shortcuts.
• Using AI with judgment. We use AI tools heavily and expect you to as well. Because AI writes much of the code, your judgment is the job: review everything before it ships, catch security and data problems, ask questions when a request is unclear, and push back when something won’t work. We are not looking for someone who passes our requests to an AI and ships what comes back.
   

Requirements

• 3+ years of Python, including Django in production
• Comfortable working in Flask
• Has built real features on LLM APIs (OpenAI, Anthropic or similar), such as structured output, tool use or web search
• Experience building REST APIs and connecting systems to each other
• Solid with PostgreSQL or MySQL, including schema design and migrations
• Deploys and maintains apps on Linux servers (we use DigitalOcean)
• Works through Git, pull requests and code review
• Strong written and spoken English. You’ll work directly with a non-technical founder on regular calls.
• At least 4 hours of overlap with US Eastern time
   

Nice to have

• PHP or Symfony experience (our legacy data comes from a Symfony app)
• WordPress integration experience
• Data matching or deduplication work, like deciding whether two records are the same person
• HubSpot API experience
• Security experience with internal tools and private APIs

We are looking for Strong Junior / Middle Full-Stack Developer to join our company GoBoutique in Lviv and work on interesting projects for our USA based clients.

Required knowledge and skills: OOP, Python, Fast API, REST API, Git, PostgreSQL, IntelliJ IDEA, Linux, Data pipeline building / data ETL, AWS, React, HTML, CSS

We offer:
— Competitive salary
— Paid vacations

If you are interested, please send us your CV. Please include your salary expectations.

If you have any questions, let's talk!

Regards,
Olya

We are looking for a Senior Full-Stack Engineer with a strong backend core to join the team behind a flagship visual AI testing platform, built by a global leader in AI-powered test automation and used by engineering teams at some of the world’s largest companies.

This role involves designing, building, and operating backend services in C# / .NET for a large-scale, multi-tenant system running in the cloud, with hands-on work across Kubernetes, cloud networking, databases, and Redis. You’ll own features end to end, contribute to the frontend where needed, and collaborate daily with the client’s engineering group in Israel as an integrated member of a hybrid team.

About the product:
The team develops the company’s flagship product: a visual AI testing platform that helps engineering teams ship high-quality applications on any browser or device. Instead of relying on fragile, hand-written assertions, the platform uses Visual AI that works like a human eye: it compares new screenshots against a baseline and automatically detects meaningful visual and functional regressions, while ignoring dynamic content such as ads, dates, or transaction IDs.

What you’ll do:
- Design, build, and operate backend services in C# / .NET that power the platform at scale.
- Contribute to backend architecture: service design, data access, performance, and scalability.
- Work hands-on with cloud infrastructure, including Kubernetes, VMs, cloud networking, databases, and Redis.
- Own features end to end, from design through deployment and production, and contribute to the frontend where needed.
- Use AI-assisted development tools to speed up development, debugging, and code reviews.
- Collaborate closely with the team through design discussions, code reviews, and shared ownership of delivery.

Requirements:
- 5+ years of hands-on industry experience as a software engineer in a product environment. 
- 5+ years of experience with .NET (C#).
- 3+ years of experience building large-scale backend systems, with a solid grasp of backend architectures and design patterns.
- 1+ years of experience in a full-stack or frontend role, or with frontend technologies.
- Hands-on experience with cloud infrastructure: Kubernetes, VMs, cloud networking, databases, Redis, or similar.
- Proven experience working in hybrid or extended teams, collaborating day to day with engineers in another country.
- Hands-on experience using AI-assisted development tools in your daily workflow to accelerate development.
- Excellent written and spoken English, with clear, confident verbal communication.
- A true team player who communicates openly and takes shared ownership of results.
- Based in Warsaw and able to work from the office 3 days per week.

Nice to have:
- DevOps experience (CI/CD, infrastructure as code, monitoring).
Hands-on experience with AI-assisted development tools.

What we offer:
- A friendly environment where you can reach your full potential and grow your career.
- A long-term, full-time B2B contract with a Polish company.
- Paid vacation days, paid sick leave, and paid days off on all Polish public holidays.
- Hybrid work in Warsaw: 3 days per week in the office, the rest of the time remotely.

About the Role (Node.js)

We're looking for a curious and motivated Junior Backend Engineer to join our team. You'll be building backend services and REST APIs and working with AWS or Azure infrastructure.

Our projects use Python or C#, but since all of our code is written with AI, we are considering candidates with any OOP language, including JavaScript and Java. What matters is how you think about software: object-oriented design, APIs, and data.

We work in pairs — juniors are always paired with another junior or someone at a similar level, not just for code reviews, but for day-to-day coding, architecture decisions, and problem solving, with seniors close by whenever you need help. This is production work: you'll ship services that customers rely on, with the safety net of another teammate beside you.

The client is US-based, so the team works US business hours; for engineers in Ukraine, this means your working day ends around midnight Kyiv time. This role can be full-time or part-time, depending on your availability.

What You'll Work On

• Backend Services & APIs — build and maintain REST APIs and backend services for client platforms, with clear contracts and automated tests.
• AWS or Azure Infrastructure — work with cloud infrastructure on AWS or Azure, depending on the project.
• CI/CD using GitHub Actions or Azure DevOps pipelines.

Tech Stack

• Backend — Our projects use Python or C#, depending on the engagement. You do not need to know either one — all code is written with AI, and you'll learn the project's framework on the job.
• Cloud — AWS or Azure, depending on the engagement. Nice-to-have, not required.

Working Hours & Format

This role can be full-time or part-time, depending on your availability. It's fully remote. Our client operates on US business hours, so the schedule needs to align with US time zones — for engineers based in Ukraine, your working day will end around midnight Kyiv time.

Requirements

Solid fundamentals in OOP and comfort with at least one OOP language — it does not matter which.

Exposure to AWS or Azure is a plus, but not required — you'll pick up what you need on the job. We care more about your curiosity and attitude than your CV.

About the Role (Java)

We're looking for a curious and motivated Junior Backend Engineer to join our team. You'll be building backend services and REST APIs and working with AWS or Azure infrastructure.

Our projects use Python or C#, but since all of our code is written with AI, we are considering candidates with any OOP language, including JavaScript and Java. What matters is how you think about software: object-oriented design, APIs, and data.

We work in pairs — juniors are always paired with another junior or someone at a similar level, not just for code reviews, but for day-to-day coding, architecture decisions, and problem solving, with seniors close by whenever you need help. This is production work: you'll ship services that customers rely on, with the safety net of another teammate beside you.

The client is US-based, so the team works US business hours; for engineers in Ukraine, this means your working day ends around midnight Kyiv time. This role can be full-time or part-time, depending on your availability.

What You'll Work On

• Backend Services & APIs — build and maintain REST APIs and backend services for client platforms, with clear contracts and automated tests.
• AWS or Azure Infrastructure — work with cloud infrastructure on AWS or Azure, depending on the project.
• CI/CD using GitHub Actions or Azure DevOps pipelines.

Tech Stack

• Backend — Our projects use Python or C#, depending on the engagement. You do not need to know either one — all code is written with AI, and you'll learn the project's framework on the job.
• Cloud — AWS or Azure, depending on the engagement. Nice-to-have, not required.

Working Hours & Format

This role can be full-time or part-time, depending on your availability. It's fully remote. Our client operates on US business hours, so the schedule needs to align with US time zones — for engineers based in Ukraine, your working day will end around midnight Kyiv time.

Requirements

Solid fundamentals in OOP and comfort with at least one OOP language — it does not matter which.

Exposure to AWS or Azure is a plus, but not required — you'll pick up what you need on the job. We care more about your curiosity and attitude than your CV.

About the Role (Backend)

We're looking for a curious and motivated Junior Backend Engineer to join our team. You'll be building backend services and REST APIs and working with AWS or Azure infrastructure.

Our projects use Python or C#, but since all of our code is written with AI, we are considering candidates with any OOP language, including JavaScript and Java. What matters is how you think about software: object-oriented design, APIs, and data.

We work in pairs — juniors are always paired with another junior or someone at a similar level, not just for code reviews, but for day-to-day coding, architecture decisions, and problem solving, with seniors close by whenever you need help. This is production work: you'll ship services that customers rely on, with the safety net of another teammate beside you.

The client is US-based, so the team works US business hours; for engineers in Ukraine, this means your working day ends around midnight Kyiv time. This role can be full-time or part-time, depending on your availability.

What You'll Work On

• Backend Services & APIs — build and maintain REST APIs and backend services for client platforms, with clear contracts and automated tests.
• AWS or Azure Infrastructure — work with cloud infrastructure on AWS or Azure, depending on the project.
• CI/CD using GitHub Actions or Azure DevOps pipelines.

Tech Stack

• Backend — Our projects use Python or C#, depending on the engagement. You do not need to know either one — all code is written with AI, and you'll learn the project's framework on the job.
• Cloud — AWS or Azure, depending on the engagement. Nice-to-have, not required.

Working Hours & Format

This role can be full-time or part-time, depending on your availability. It's fully remote. Our client operates on US business hours, so the schedule needs to align with US time zones — for engineers based in Ukraine, your working day will end around midnight Kyiv time.

Requirements

Solid fundamentals in OOP and comfort with at least one OOP language — it does not matter which.

Exposure to AWS or Azure is a plus, but not required — you'll pick up what you need on the job. We care more about your curiosity and attitude than your CV.

Project Description:

You will join a Regulatory Reporting Platform within a large US investment bank. The platform is responsible for collecting, processing, and transforming large volumes of data from multiple internal systems to produce regulatory reports for 240 jurisdictions worldwide. In total, the platform supports around 10,000 reports across a wide range of regulatory, compliance, financial, and risk reporting areas.
This is a large-scale, business-critical data platform operating in a highly regulated environment, where data accuracy, quality, traceability, and timely delivery are essential. The team works on building and enhancing data pipelines, implementing reporting logic, ensuring data validation and reconciliation, and supporting the generation of complex regulatory outputs.
The project is delivered by a global distributed team with colleagues located in Ukraine, Poland, and the US, offering close collaboration with engineers, analysts, and business stakeholders across multiple regions.

Responsibilities:

- Design, develop, and maintain solutions for a large-scale Regulatory Reporting Platform
- Build and enhance data processing pipelines using Java and Apache Spark
- Implement scalable logic for data ingestion, transformation, aggregation, and enrichment from multiple internal data sources
- Develop and optimize batch processing jobs to support the generation of regulatory reports across multiple jurisdictions
- Ensure high standards of data quality, validation, reconciliation, and consistency throughout the reporting lifecycle
- Translate business and regulatory requirements into robust technical solutions
- Collaborate with business analysts, QA engineers, and cross-functional teams to deliver reporting functionality
- Investigate and resolve data and application issues in development, test, and production environments
- Improve application performance, scalability, and reliability for high-volume data processing workloads
- Contribute to the design and implementation of reusable components and engineering best practices
- Participate in code reviews, testing, and release activities to ensure high-quality deliverables
- Work closely with distributed teams across Ukraine, Poland, and the US in an agile delivery model
- Support continuous improvement of the platform, including monitoring, troubleshooting, and operational stability

Mandatory Skills:

- 6+ years of commercial experience with Java
- Experience in designing and developing scalable, high-performance backend applications
- Good knowledge of SQL and working with large datasets from multiple data sources
- Strong problem-solving skills and ability to work effectively in a global distributed team

Nice-to-Have Skills Description:

- Spark and Hadoop knowledge
- Experience in financial services, investment banking, or regulatory reporting projects
- Familiarity with data quality, reconciliation, and control frameworks
- Experience working with large-scale enterprise data platforms
- Knowledge of cloud environments and modern data platform architectures
- Understanding of CI/CD practices and automated deployment pipelines
- Experience working in Agile / Scrum teams within a distributed global setup

Recruitment process:

1. CV Review — the project team reviews your experience and its relevance to the position.
2. Coderbyte Test — an online coding assessment.
3. Technical Interview — a technical discussion with our interviewer.
4. Project Management Interview (PMI) — a discussion about your experience, communication, and project fit.
5. Karat Interview — the first technical interview with the client.
6. Client Interview — the final interview with the client’s project team.

About the Role

We're looking for a curious and motivated Junior С# Engineer to join our team. You'll be building backend services, REST APIs, with some exposure to cloud infrastructure along the way.

We work in pairs — juniors are always paired with someone at a similar or slightly higher level, not just for code reviews, but for day-to-day coding, architecture decisions, and problem solving. This is production work: you'll ship backend services that customers rely on, with the safety net of another teammate beside you.

The client is US-based, so the team works US business hours; for engineers in Ukraine, this means your working day ends around midnight Kyiv time. This role can be full-time or part-time, depending on your availability.
 

What You'll Work On

• Backend Services & APIs — build and maintain REST APIs and backend services for client platforms.
• Azure and Cloudflare infrastructure — Azure DevOps pipelines for CI/CD
• Salesforce backend for data storage

Tech Stack

• Backend — C# (our main language), REST API.
• Cloud — Azure - nice-to-have, you'll pick up what you need on the job.

Working Hours & Format

This role can be full-time or part-time, depending on your availability. It's remote, with occasional face-to-face working sessions. Our client operates on US business hours, so the schedule needs to align with US time zones — for engineers based in Ukraine, your working day will end around midnight Kyiv time.

Requirements

Solid fundamentals in C#, and a basic understanding of REST APIs.

Exposure to Azure is a plus, but not required — you'll pick up what you need on the job. We care more about your curiosity and attitude than your CV.

Senior Golang Backend Developer

Location: Remote
Workload: Full-time
Project: Long-term

About the role

We’re looking for a Senior Golang Backend Developer to build and scale microservices-based systems and help the engineering team migrate existing backend services from Node.js/NestJS to Go.

The role involves designing high-load services, working with distributed systems, improving backend architecture, and implementing modern patterns for asynchronous processing and real-time communication.

You’ll work with an existing production codebase, contribute to the migration strategy, and help the team gradually transition services from Node.js to a scalable Go-based architecture.

Requirements

• 4+ years of backend development experience
• 3+ years of hands-on experience with Go / Golang
• Strong understanding of Go fundamentals, concurrency, goroutines, channels, interfaces, contexts, and error handling
• Strong experience with PostgreSQL, MongoDB, and Redis
• Solid understanding of microservices architecture
• Experience building high-load and distributed systems
• Experience with asynchronous processing, queues, and event-driven architectures
• Experience building REST APIs, WebSockets (WS/WSS), and RPC/gRPC services
• Ability to design scalable, maintainable, and reliable backend services
• Ability to read, understand, refactor, and migrate existing codebases
• Strong understanding of performance optimization and observability
• High attention to detail

Nice to have

• Experience with Node.js / NestJS, especially in projects migrating from Node.js to Go
• Previous experience migrating production services between technology stacks
• Deep knowledge of Go concurrency patterns and performance optimization
• Experience with gRPC / Protocol Buffers
• Deep knowledge of Redis, including MULTI/EXEC, data structures, Lua scripts, and Pub/Sub
• Experience with message brokers and event-driven systems
• Experience with Docker, Kubernetes, and cloud environments
• Basic understanding of prompt engineering, AI agents, and AI skills

Responsibilities

• Develop and maintain backend services using Golang
• Design and implement high-load, scalable microservices
• Help the engineering team migrate existing Node.js/NestJS services to Go
• Analyze the existing Node.js architecture and define appropriate Go implementations
• Refactor and gradually replace existing Node.js services while maintaining system stability
• Design APIs and service-to-service communication using REST, WebSockets, RPC/gRPC, and event-driven patterns
• Work with asynchronous architectures, queues, and distributed systems
• Optimize backend performance, reliability, and scalability
• Improve architecture and engineering practices during the migration
• Review code and contribute to technical decisions
• Collaborate with developers and other cross-functional team members

Project Description:

Build software that runs real mining operations. See your work live on an open pit mine site. We are looking for a Senior Full Stack Developer or strong Backend Developer to help build and evolve a large scale software platform used in open pit mining operations.
This is not internal tooling or maintenance work. You will be building new features in a modern, distributed system where the changes you make are deployed into live mine sites and used every day by operational teams.
If you care about ownership, clean architecture, and seeing your work have real world impact, this role is worth a look.

Responsibilities:

You will join a cross functional product squad responsible for delivering new capabilities across a complex operational platform that supports fleet and equipment workflows in open pit mining.

Your work will include:
· Designing and building backend services using C# and .NET in a microservices and event driven architecture
· Building modern React applications focused on clarity, performance, and usability
· Owning features end to end from design through to production deployment
· Working closely with domain experts to turn complex operational problems into reliable software
· Contributing to architectural decisions, technical standards, and engineering best practice
· Improving reliability, observability, and performance in a mission critical system

Mandatory Skills Description:

• Strong experience with C# and .NET
• Experience designing and building microservices and event driven systems
• Solid SQL skills and experience with SQL Server
• Experience with Entity Framework or similar ORMs
• Comfortable owning APIs, service design, and data models
Frontend
• Strong experience with React
• Experience using modern component libraries such as MUI, Mantine, or shadcn
• Experience with state management libraries such as Redux, Zustand, or MobX
• A focus on building maintainable and user friendly interfaces

Nice-to-Have Skills Description:

• Docker and Kubernetes exposure
• Experience integrating with native or performance critical systems such as C++
• Previous experience in mining or industrial software
• Experience working with open pit mining systems

Languages:

English: B2 Upper Intermediate

About ChatRevenue.ai 

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

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

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

About the role 

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

This is a hands-on engineering role focused on: 

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

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

What you will do 

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

What we are looking for 

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

Nice to have 

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

This role is likely a strong match for people who 

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

What we offer 

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

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

Numerical Technologies LTD is a provider of custom software solutions and services specializing in risk, limits, and regulatory capital. We are currently looking for a Senior Python Developer to join our team. 

Project: Development of a Market Risk platform for a global financial institution, supporting risk analytics, market data processing, and large-scale financial applications. 

What you will be doing

As part of the team, you will be participating in a client project focused on Market Risk Technology solutions. You will help develop new software features, as well as support and maintain existing ones. You will write scalable and fault-tolerant code, debug applications, and build solutions for market data processing and risk analytics. You will collaborate closely with the client, product managers, and engineering teams to understand the system’s functional and non-functional requirements. You will contribute to code quality through unit testing, integration testing, code review, and system design to build robust software that aligns with the client’s business needs. 

What we are looking for

• 5+ years of commercial Python development experience.
• Strong knowledge of object-oriented programming, algorithms, and data structures.
• Experience designing scalable backend applications, frameworks, or data platforms.
• Experience building backend systems and working with REST APIs.
• Experience working with SQL, large datasets, and data processing pipelines. 
• Experience with automated testing and CI/CD practices.
• Experience using distributed computing technologies is a strong plus. 
• Strong problem-solving skills and ability to collaborate effectively in a team environment.
• Upper-Intermediate level of English or above. 
• Bachelor’s degree or higher.

What will be a plus

• Extensive experience with C++ or Java/Scala.
• Experience in financial services or Market Risk systems.
• Knowledge of Historical VaR, Expected Shortfall, or FRTB.

What we offer

• Competitive compensation depending on experience and skills.
• Regular performance assessments and salary reviews.
• Paid personal days.
• Mental health support program.
• Language classes.
• Flexible working schedule.