Jobs Golang

We are the creators of a new fintech era!
Our mission is to change this world by making blockchain accessible to everyone in everyday life. WhiteBIT is a global team of over 1,200 professionals united by one mission — to shape the new world order in the Web3 era. Each of our employees is fully engaged in this transformative journey.
We work on our blockchain platform, providing maximum transparency and security for more than 8 million users worldwide. Our breakthrough solutions, incredible speed of adaptation to market challenges, and technological superiority are the strengths that take us beyond ordinary companies. Our official partners include the National Football Team of Ukraine, FC Barcelona, Lifecell, FACEIT and VISA.
 
The future of Web3 starts with you — join us as a Blockchain Platform Engineer!
 
Requirements:

— Experience: 4+ years of professional experience in software engineering, where the last 2+ years was hands-on experience in the blockchain domain.

— Strong production Golang: you write and ship services in Go, and you are comfortable reading, debugging and patching upstream Go codebases.

— Blockchain Expertise: Extensive experience with Ethereum, including a deep understanding of its protocol, smart contract development, and associated technologies.

— Hands-on experience in developing, deploying, and maintaining smart contracts on EVM chains (Solidity).

— Understanding of L2s and optimistic rollup fundamentals: block derivation from L1, batch submission, state proposals, the withdrawal flow, and forced inclusion.

— Understanding of OP Stack components and architecture.

— Kubernetes and CI/CD: familiarity with Kubernetes for container orchestration and CI/CD tools for deployment automation.

— Monitoring Tools: Familiarity with monitoring tools such as Prometheus and Grafana for performance tracking.

— Cloud Platforms: Familiarity with cloud platforms (preferably AWS) and experience with containerization (Docker) is a strong plus.
 

Would be a plus:

— Rust at the level of reading and patching code.

— Understanding of fault proofs: dispute games, bisection, FPVM, as well as ZK-based approaches.

— Experience in conducting and successfully passing smart contract security audits.

— Experience in developing blockchain nodes, bridges, indexers, etc.
 

Responsibilities:

— Deploy, upgrade, and operate OP Stack components.

— Set up monitoring and alerting: Prometheus, Grafana, PromQL dashboards, instrumentation of domain metrics (economic, bridge, sequencing).

— Take part in the on-call rotation, drive incident response, and write post-mortems and runbooks.

— Work with the smart contracts, security and product teams on launches, network upgrades and hard fork activations.

— Foster collaboration, knowledge sharing, and professional growth.

— Work closely with cross-functional teams to define project requirements and ensure alignment with business objectives.

— Stay updated on advancements in blockchain technology and Ethereum, and apply new features and best practices to enhance our solutions.
 

Work conditions:

Immerse yourself in Crypto & Web3:
— Shape the Future — Work on high-impact blockchain products at the forefront of Web3.
— Innovate & Create — Your ideas drive real-world solutions and technological breakthroughs.
— Global Reach — Build scalable solutions for businesses and users worldwide.
— Web3-Powered Culture — A team of visionaries who believe in decentralization and innovation.
 
Work-Life Balance & Well-being:
— Modern equipment.
— Comfortable working conditions, and an inspiring environment to help you thrive.
— 24 calendar days of paid leave.
— Additional days off for national holidays.

Senior Backend Engineer (Go) — AI Infrastructure & Agentic Systems

Work Format: Fully Remote
Engagement: Freelance / Independent Contractor (B2B)
Workload: Full-time (40 hours/week)
Contract Duration: Initial 3 months, with the possibility of long-term extension
Compensation: Competitive, based on experience and qualifications
Start Date: ASAP

About the Role

We are looking for an experienced Senior Backend Engineer from Ukraine to contribute to the development of an advanced AI infrastructure platform.

The project focuses on building scalable backend services that enable intelligent AI agents to interact with external systems, execute complex workflows, and perform tasks autonomously.

You will work on challenging problems at the intersection of distributed computing, cloud infrastructure, and applied artificial intelligence.

As part of an international engineering team, you will help develop reliable infrastructure supporting multiple AI-powered applications and services.

Key Responsibilities

• Design, develop, and maintain high-performance backend services using Go.
• Build infrastructure supporting autonomous AI agents and multi-step task execution.
• Implement scalable mechanisms for AI model integration, tool orchestration, and asynchronous processing.
• Develop secure and extensible APIs and integrations with external systems.
• Improve the reliability, scalability, and performance of distributed services.
• Design solutions for long-running workflows, isolated execution environments, and fault-tolerant processing.
• Implement monitoring, logging, and observability solutions.
• Participate in architectural decisions and technical design discussions.
• Collaborate with backend, platform, product, and AI engineers.

• Maintain engineering standards through automated testing, code reviews, and continuous delivery.

   

Required Qualifications

Backend Engineering

• Strong commercial experience developing production-grade backend applications.
• Advanced proficiency in Go (Golang).
• Solid understanding of distributed systems, asynchronous processing, and service-oriented architectures.
• Experience designing secure, scalable, and fault-tolerant backend solutions.
   

Cloud & DevOps

• Hands-on experience with AWS and cloud-native application development.
• Experience implementing CI/CD pipelines and automated testing.
• Familiarity with production monitoring, observability, and performance optimization.
   

AI & LLM Integration

• Practical experience integrating LLMs or AI-powered functionality into production applications.
• Understanding of AI agent architectures, model orchestration, and tool-calling mechanisms.
• Familiarity with Model Context Protocol (MCP) and Agent-to-Agent (A2A) architectures.
   

Engineering Practices

• Ability to independently evaluate technical trade-offs and make architectural decisions.
• Experience collaborating with cross-functional engineering teams.
• Strong problem-solving skills and a pragmatic approach to software delivery.
• Regular use of AI-assisted development tools such as GitHub Copilot, Cursor, Claude Code, or similar solutions.
   

Nice to Have

• Experience developing autonomous AI agents and multi-step workflows.
• Knowledge of event sourcing and event-driven architectures.
• Python programming skills.
• Background in AI/ML infrastructure or developer productivity platforms.
• Experience working in startups or fast-paced technology environments.
   

Ideal Candidate

We are looking for a proactive engineer who combines strong technical expertise with a practical, results-oriented approach.

You should be comfortable working with evolving architectures, exploring emerging technologies, and taking ownership of solutions from initial design to production.

The ideal candidate:

• Makes independent technical decisions and takes responsibility for outcomes.
• Balances rapid delivery with reliability and maintainability.
• Thrives in dynamic environments with evolving requirements.
• Actively explores emerging AI technologies and development practices.
• Communicates effectively within distributed international teams.
• Demonstrates strong ownership, autonomy, and collaborative skills.
   

What We Offer

• Fully remote collaboration with an international engineering team.
• Full-time freelance engagement.
• Initial 3-month contract with the possibility of long-term cooperation.
• Opportunity to work with cutting-edge AI technologies and agentic architectures.
• Direct involvement in architectural decisions and technical implementation.
• Challenging engineering problems involving distributed systems and AI infrastructure.
• Flexible, results-oriented working environment.
• Competitive compensation based on experience and qualifications.

If you have strong Go backend development experience, solid expertise in AWS and distributed systems, and hands-on experience integrating LLMs and building AI-powered solutions, we'd be happy to hear from you!

We’re hiring a Senior Full Stack Engineer for our client, an Israeli product company building cloud platforms for business messaging and contact centres.

About the project

The products help businesses manage customer messages and calls: route conversations to the right agent, connect communication channels, and give support teams tools to monitor activity in real time.

You’ll work on Go services that handle high traffic and React interfaces used to manage thousands of live conversations. The work spans backend services, frontend features, and integrations with communication providers.

The team uses AI coding agents daily. You’ll use tools such as Claude Code or Cursor to develop across the stack, review their output, and take responsibility for the code you ship.

What you’ll do

- Build features across the Go backend and React/TypeScript frontend.

- Design services and APIs for high-load, distributed systems.

- Develop real-time interfaces and external integrations.

- Investigate production issues and improve performance and reliability.

- Contribute to architecture decisions and the team’s development practices.

What we’re looking for

- 5+ years of professional software engineering experience.

- Around 4 years of production experience with Go.

- Working experience with React and TypeScript.

- Experience building and debugging high-load, distributed systems.

- Daily use of AI coding tools beyond autocomplete, including reviewing and testing generated code.

- Ability to make technical decisions independently and follow work through to production.

- Good spoken and written English for technical discussions and everyday collaboration.

The stack

Go, React, TypeScript, REST APIs, GraphQL, WebSocket/SSE, Kafka, NATS/JetStream, RabbitMQ, PostgreSQL, Redis, MongoDB, GCP, Kubernetes, Docker, and CI/CD.

Go and React/TypeScript are the core technologies. You don’t need experience with every tool listed.

Useful additional experience

- CPaaS, CCaaS, telecom, or contact-centre products.

- WebRTC, SIP, media servers, or voice integrations.

- API gateways, GraphQL federation, or infrastructure management.

- Tools, evaluations, or automation built with LLM APIs.

- Open-source contributions, particularly in Go.

Working arrangements

This is a full-time remote role for someone based in Europe, under a B2B contract. You’ll join a distributed engineering team and have a say in how the systems are designed and developed.

Hiring process

After your application is reviewed, the next step is an AI interview. The remaining stages are:

1. An online Go/React coding assessment, approximately 40–50 minutes.

2. A technical interview with the CTO and R&D Director, approximately one hour.

3. A short HR conversation.

To apply, send your CV and LinkedIn profile, along with your current location and availability.

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

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

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

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

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

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

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

About the role

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

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

Responsibilities:

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

Requirements:

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

Nice to have:

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

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

About the job

ProxyScrape empowers businesses with seamless, scalable, and ethical access to publicly available web data. Our proxy and data-access infrastructure supports thousands of companies across eCommerce, cybersecurity, research, and advertising — delivering reliability, performance, and global scale.

We are a fast-growing, bootstrapped, and profitable tech company built around speed, automation, and impact. We move quickly, ship often, and value people who take ownership and push things forward.

We are now looking for a Software Engineer to join our Dev/Product team — a hands-on engineer with real experience in proxy and scraping systems who enjoys building, shipping, and owning production infrastructure.

You’ll work on the core of our products, from backend services and data pipelines to frontend and infrastructure.

Your Mission

You will build, scale, and improve the systems behind ProxyScrape’s core products, turning technical challenges into reliable, fast, and cost-efficient solutions.

• Design and implement features and services across core products and internal systems
• Contribute to architecture discussions and technical decisions
• Identify repetitive, manual, or error-prone processes and automate them, using AI-assisted tools where it makes sense
• Help the team ship faster through better tooling and systems
• Work closely with product and engineering to turn business needs into working software

Key Responsibilities

• Build and maintain backend services, APIs, and data pipelines with Go and PHP
• Develop frontend features with React and Next.js
• Work on scraping and proxy infrastructure: improve success rates, latency, reliability, and cost
• (Optional) Work on anti-bot systems, including fingerprinting and protection bypass strategies, to make the platform more resilient
• Take part in deployments, CI/CD, and monitoring alongside the team
• Write clean, tested, well-documented code and take part in code reviews

What You Bring

Proxy & Scraping Experience

• Around 2 years of hands-on production experience with proxy systems and web scraping
• Experience building and operating proxy-based or scraping infrastructure
• Practical understanding of IP rotation strategies, session persistence, fingerprinting, CAPTCHA/bot mitigation, and unblock flows
• Experience improving success rates, latency, reliability, and cost in data extraction pipelines

Technical Foundation

• 3+ years of engineering experience building backend or data platforms
• Strong hands-on experience with Go/PHP
• Frontend skills with React and Next.js
• Experience designing, building, and integrating APIs
• Experience with Redis, queues, and message brokers
• Comfortable working with Docker, Kubernetes, Helm, CI/CD pipelines, and observability tools
• Comfortable working in Linux production environments
• Good understanding of HTTP, TLS, HTTP/2, proxies, browser internals, and CDP
• Familiarity with networking fundamentals (DNS, TCP/IP) and request optimization
• Fluent English (documentation and communication are in English)

Mindset

• You thrive in fast-moving startups where ambiguity is normal and execution matters more than process
• You take ownership of your work, from design to delivery and quality
• You make sound decisions on your own and proactively improve systems
• Product-driven mindset: you care about user impact and business value, not just elegant code
• You spot risks and bottlenecks early and act on them
• Curious and practical about AI tools that make development faster

Why Join ProxyScrape

• Work on core products from the ground up
• High autonomy and real influence on the technical solutions you build
• Work directly with the CTO and a strong scraping lead
• Competitive compensation package
• Remote-first flexibility
• Budget for conferences, learning, and work tools
• Join a lean, ambitious team where execution beats bureaucracy

If you’re excited by complexity, ownership, and building real systems — we’d love to talk.

Interested? Let’s connect and discuss the details!

We are a senior engineering team hiring a backend engineer for a long-term role inside a client's product team. The client is a product company with a large user base. We share its name only with engineers who pass our technical call.

Engineers there shape what gets built, not only how, and work directly with product people.

The product's image and video generation runs on ComfyUI workflows, so hands-on ComfyUI is a must for this role.

What matters most to us
• You have built or run ComfyUI workflows yourself, with models deployed locally and custom nodes in the pipeline
• You have built a product that people use every day, and you can point to the parts you owned
• You think about the person using the product. You question a feature when it does not serve them and suggest a better one
• Experience with consumer products built around image or video is a strong plus

What you will do
• Build and run ComfyUI workflows for image and video generation
• Build and scale the backend services around them in Go
• Run background jobs reliably, with queues, retries and idempotent steps
• Turn new models into features people actually use

You should have
• Hands-on ComfyUI, at least on your own projects
• 3+ years of Go in production and 5+ years of backend work overall. 
• Experience owning parts of a production system end to end
• Fluent English for daily work with the client team

The role is full time, 40 hours a week, long term, with a working day that overlaps European business hours. Individual engineers only, no agencies.

How we hire: a call with our CTO about your ComfyUI work, your product work and your code, then a call with the client's team. Both are live, with screen share and without AI assistants.

To apply, open your application with a link to a ComfyUI workflow you built or ran, or one sentence on what it did. Applications without it will not be read.

We're looking for a mid-senior Backend Engineer with strong Go and PostgreSQL skills. You'll join an early-stage, venture-backed startup as one of its first backend hires. The company is building a TikTok-style endless scroll of user-generated hypercasual mini-games. Your job is to build the core services behind the game feed, user data and content delivery, and to shape the product's technical direction for years to come. This is a founding-level role with real ownership, for someone who wants to build from the ground up and not maintain someone else's system.

Details: 

• Location: Sofia, Bulgaria, on-site 5 days a week
• Employment: Full-time (no contractor, consultant or B2B setups)
• Level: Mid-Senior
• Relocation: Supported for strong candidates (1–1.5 months' notice maximum)

What you'll do

• Design and build the Go services that power the game feed, user data and content delivery
• Own PostgreSQL schema design and query performance as the product scales
• Own deployments and keep services reliable (Linux, Docker)
• Set up observability (logging, metrics, tracing) from day one
• Work on data pipelines and recommendation / feed-ranking logic
• Design REST APIs for iOS and Android clients
• Work closely with the founders on technical and product direction

Tech stack

Go, Fiber, PostgreSQL, Docker, Linux, REST APIs, data pipelines, recommendation systems

Requirements

• 3+ years of production Go experience, having shipped and maintained services under real traffic
• Solid PostgreSQL experience beyond basic CRUD, including schema design and query optimisation
• Hands-on experience with Linux and Docker, including owning deployments
• Based in Sofia or willing to relocate there
• Ready for full-time, 5-day on-site work

Nice to have

• Experience with recommendation systems, feed ranking or ML-adjacent data pipelines
• Background in hyper-casual gaming or rapid-prototyping environments
• Experience designing APIs for mobile clients
• A startup or founder-led mindset, comfortable with speed and ambiguity

Hiring process

1. Online interview to discuss your experience and mutual fit
2. In-person technical challenge and interview at the Sofia office

Description

We are seeking a Senior Software Engineer to join our Fleet Migration Team. The team develops software tools that automate customer VM movement across data center clusters without service disruption. You will write the automation services and coordination scripts that power our large-scale transition to ARM hardware.

Requirements

Education & experience: Bachelor of Science in Computer Science, Systems Engineering, or a related field, plus heavy experience in systems automation and backend tool development.
Programming Languages: High proficiency in Python and Go, along with Bash scripting.
Virtualization & OS: Good understanding of Linux hypervisors, VM storage snapshots, and state transfer mechanisms.
API & Systems: Experience building CLI tools, REST APIs, and database-backed workflow engines.

Job responsibilities

Build and maintain backend services and CLI scripts to automate customer-driven warm/cold VM migrations.
Implement state tracking, validation checks, and rollback logic for automated migration jobs.
Integrate migration automation with central database state stores and orchestration APIs.
Troubleshoot migration failures and performance bottlenecks during operational test runs.

About the role
We're building a cybersecurity SaaS product with LLM-powered features. We're looking for a Senior Go engineer on a part-time basis with hourly pay, who will own backend features end to end, from API design to production. We'll share the company name after the intro call.

Format
- Part-time, hourly pay
- Fully remote
- Workload is agreed on the intro call

What you'll do
- Build new features and extend existing functionality, including LLM-based features
- Integrate the platform with third-party services
- Work with AWS infrastructure (EC2, S3 and other services)
- Review the existing codebase, suggest improvements, fix bugs and refactor

First 90 days: onboarding and getting to know the backend code, improvement proposals, bug fixes, refactoring and smaller features.

Tech stack
- Go, Labstack Echo, sqlx
- REST, Swagger / OpenAPI
- PostgreSQL
- AWS: EC2, S3, SES; AWS Bedrock for LLM features
- OpenSearch for observability
- GitHub Actions
- Monolith; background jobs run inside the backend; in-memory caching in Go

Requirements
- 4+ years of commercial backend development, including 3+ years of production experience with Go
- Advanced Go: idiomatic code, concurrency (goroutines, channels, context), error handling, testing and profiling
- Designing and documenting REST APIs (Swagger / OpenAPI) for multi-tenant SaaS, including OAuth 2.0 authorization
- Strong PostgreSQL: schema design, migrations, complex hand-written SQL without an ORM (joins, subqueries, aggregations, window functions, CTEs), query optimization (indexes, EXPLAIN)
- Building fault-tolerant integrations with external services: third-party APIs, webhooks, push/pull
- Hands-on experience with AWS as a developer: EC2, S3, SES
- Observability: logging, metrics, tracing
- Owning a feature end to end: self-review, clear API contracts for the frontend, deploying to the dev environment and testing your work before handing it over
- Secure coding: OWASP API Top 10, secrets management, handling personal data in line with GDPR
- English B1 (Intermediate) or higher

Working with AI
- You use AI daily as an assistant for refactoring, testing and debugging, while writing your own code
- You can critically review AI-generated code for bugs, security issues and design flaws
- You understand how LLMs work: prompting, common failure modes, evaluating output quality
- You've integrated LLMs into Go services: structured output (JSON, tool calling), error and timeout handling, retries, rate limits, cost and latency control

Nice to have
- SSO (OAuth / OIDC), SCIM, Microsoft Graph / Entra ID
- AWS SDK for Go
- Message brokers (RabbitMQ, Kafka)
- Integration testing
- Server-side PDF report generation; i18n in APIs
- Background in cybersecurity; understanding of cryptography (hashing, symmetric and asymmetric encryption)
- Shipping LLM-based features to production
- AI agents and tool calling (including MCP), RAG with embeddings and vector search
- LLM security: prompt injection, data leakage, OWASP Top 10 for LLM Applications

Hiring process
1. Intro call
2. Technical interview
3. Final interview and offer

We are looking for a Software Engineer - Software Engineer - Identity & Access Management to join our team.

Key Responsibilities:

• Design, develop, and maintain high-throughput, low-latency identity services, including Single Sign-On (SSO), Multi-Factor Authentication (MFA), and session management and federation;
• Implement and scale modern authentication and authorization protocols (OAuth 2.0, OpenID Connect, JWT assertions,..);
• Write clean, concurrent, and highly performant backend code primarily in Golang to support our rapidly growing user base;
• Utilize your DevOps background to deploy, manage, and monitor identity services;
• Act as the subject matter expert on authentication and guide other engineering teams on securely integrating with our identity platform;
  Design and maintain solutions involving custom and standard identity providers, like KeyCloak and AWS Cognito.
   

What we are looking for:

• Solid understanding of web security, and user identity in the context of federated authentication;
• Proven experience as a software engineer building complex, distributed backend systems, with a strong, demonstrated proficiency in Golang and gRPC;
• Deep conceptual understanding and practical experience with modern authentication flows, authorization frameworks, and cryptographic fundamentals (e.g., OAuth2, OIDC, RBAC,..);
• Hands-on experience with modern infrastructure tooling. You should be comfortable with cloud platforms (AWS,..), container orchestration (Kubernetes), and Infrastructure as Code (Terraform, Terragrunt, Tofu,..);
• A solid grasp of secure coding practices, common web vulnerabilities (OWASP Top 10), and how to mitigate them at the architectural level;
• The ability to design scalable systems that can handle massive throughput without compromising on latency or security;
• You can explain complex security and architectural concepts to both technical and non-technical stakeholders, driving consensus across teams.

We offer

• Maximum flexibility;
• Professional trainings, conferences and certifications;
• Corporate events and benefits;
• Professional literature;
• English courses.

Your future responsibilities:

• Own the architecture of the authorization platform end-to-end — from design through production operations
• Design and implement sidecar-based authorization mechanisms and policy enforcement engines
• Define authorization models (RBAC, ABAC, ReBAC) and translate business requirements into enforceable policies
• Drive technical decisions on authorization infrastructure — evaluate, select, and integrate tools (OpenFGA, OPA, SpiceDB, etc.)
• Design token exchange and delegation flows (OAuth 2.0 OBO, Keycloak token exchange) for multi-service authorization
• Collaborate with platform, security, and product teams to define access control policies and architectural standards
• Mentor and enable other engineering teams on secure authorization patterns and integration best practices
• Own CI/CD pipelines and infrastructure as code for authorization services — ensuring reliability, observability, and fast delivery
• Lead incident response for authorization-related issues — troubleshoot, resolve, and drive root-cause improvements
• Contribute to technical strategy — ADRs, RFCs, technical documentation, and knowledge sharing across teams
• Leverage AI tools and automation to accelerate development, reduce toil, and improve code quality

Your skills and experience:

• 5+ years of professional Golang development
• Expert-level understanding of Go concurrency patterns, interfaces, and idiomatic Go
• Deep knowledge of authorization models and systems (RBAC, ABAC, ReBAC, Zanzibar-style)
• Hands-on experience with policy engines (OPA/Rego, OpenFGA, or similar)
• Experience designing and operating sidecar-based authorization at scale
• Strong understanding of OAuth 2.0 / OIDC flows, token exchange, and identity federation (Keycloak or similar IdP)
• Experience with PostgreSQL and data modeling for access control
• Ability to design systems for high availability, low latency, and horizontal scalability
• Practical use of AI-assisted development tools (GitHub Copilot, Claude, Cursor, etc.
• Advanced Kubernetes experience (operators, CRDs, admission webhooks, troubleshooting at cluster level)
• Experience designing and maintaining CI/CD pipelines (GitHub Actions)
• Proficiency with ArgoCD for GitOps-based continuous delivery
• Experience authoring and managing Helm charts for complex deployments
• Infrastructure as code with Terraform/Terragrunt — including module design and state management
• Observability setup for authorization services (metrics, tracing, alerting)

Nice to Have

• Experience with Google Zanzibar-inspired systems (OpenFGA, SpiceDB, Authzed) in production
• Experience with service mesh (Istio/Envoy) and integrating authorization at the mesh layer
• Familiarity with MCP (Model Context Protocol) or/and agent-based architectures and their authorization challenges
• Background in platform engineering or developer experience
• Experience with security auditing, compliance standards, or regulated environments (banking/fintech)
• Experience designing multi-tenant authorization with delegation patterns
• Contributions to open-source authorization tooling
• Experience automating workflows with AI-powered tools or building internal developer tooling

We offer what matters most to you:

• Competitive salary: we guarantee a stable income and annual bonuses for your personal contribution. Additionally, we have a referral reward program for attracting new colleagues to Raiffeisen Bank
• Social package: official employment, 28 days of paid leave, additional “maternity leave” for fathers, and financial assistance for parents upon the birth of children
• Comfortable working conditions: the possibility of a hybrid work format, offices equipped with shelters and generators, provision with modern equipment
• Wellbeing program: all employees have access to medical insurance from the first working day; consultations with a psychologist, nutritionist or lawyer; discount program for sports and shopping; family days for children and adults; massage in the office
• Learning and development: access to over 130 online educational resources; corporate training programs, online library, mentoring program
• A great team: our colleagues are a community where curiosity, talent and innovation are welcomed. We support each other, learn together and grow. You can find like-minded people in over 15 professional communities, reading or sports clubs
• Career opportunities: we encourage advancement within the bank between functions
• Innovation and technology. Infrastructure: AWS, Kubernetes, Docker, GitHub, GitHub actions, ArgoCD, Prometheus, Victoria, Vault, OpenTelemetry, ElasticSearch, Crossplain, Grafana. Languages: Java (main), Python (data), Go (infra, security), Swift (IOS), Kotlin (Andorid)Datastores: Sql-Oracle, PgSql, MsSql, Sybase. Data management: Kafka, AirFlow, Spark, Flink, we develop expertise in AI and actively integrate it into processes
• Support program for defenders: we preserve jobs and pay the average salary to mobilized people. We have a support program for veterans, and the Bank’s veteran community is developing. We are working to raise awareness among managers and teams on the issues of veterans’ return to civilian life. Raiffeisen Bank is recognized as one of the best employers for veterans (Forbes)

______________________________________________________________________

Твої майбутні обов’язки: 

• Повний цикл володіння архітектурою платформи авторизації — від проєктування до підтримки в production
• Проєктування та реалізація sidecar-базованих механізмів авторизації та рушіїв застосування політик
• Визначення моделей авторизації (RBAC, ABAC, ReBAC) і трансформація бізнес-вимог у політики доступу
• Прийняття технічних рішень щодо інфраструктури авторизації — оцінка, вибір та інтеграція інструментів (OpenFGA, OPA, SpiceDB тощо)
• Проєктування потоків обміну токенами та делегування доступу (OAuth 2.0 OBO, Keycloak token exchange) для авторизації між сервісами
• Співпраця з платформеними, security- та product-командами для визначення політик контролю доступу й архітектурних стандартів
• Менторинг інших engineering-команд щодо безпечних патернів авторизації та найкращих практик інтеграції
• Підтримка CI/CD-пайплайнів та infrastructure as code для сервісів авторизації — забезпечення надійності, observability і швидкої доставки змін
• Участь у реагуванні на інциденти, пов’язані з авторизацією — пошук і усунення проблем та аналіз root cause
• Внесок у технічну стратегію — ADR, RFC, технічна документація та обмін знаннями між командами
• Використання AI-інструментів та автоматизації для прискорення розробки, зменшення рутини та покращення якості коду

Твій досвід та навички:

• 5+ років професійної розробки на Golang
• Експертне розуміння concurrency patterns, interfaces та idiomatic Go
• Глибокі знання моделей та систем авторизації (RBAC, ABAC, ReBAC, Zanzibar-style)
• Практичний досвід роботи з policy engines (OPA/Rego, OpenFGA або аналогічними)
• Досвід проєктування та експлуатації sidecar-based authorization у масштабованих системах
• Сильне розуміння OAuth 2.0 / OIDC flows, token exchange та identity federation (Keycloak або інший IdP)
• Досвід роботи з PostgreSQL та моделюванням даних для систем контролю доступу
• Вміння проєктувати системи з високою доступністю, низькою затримкою та горизонтальним масштабуванням
• Практичний досвід використання AI-assisted development tools (GitHub Copilot, Claude, Cursor тощо)
• Просунутий досвід роботи з Kubernetes (operators, CRDs, admission webhooks, troubleshooting на рівні кластера)
• Досвід створення та підтримки CI/CD-пайплайнів (GitHub Actions)
• Впевнене використання ArgoCD для GitOps-based continuous delivery
• Досвід написання та підтримки Helm charts для складних деплойментів
• Infrastructure as code з Terraform/Terragrunt — включно з дизайном модулів і керуванням state
• Налаштування observability для сервісів авторизації (метрики, tracing, alerting)

Буде плюсом:

• Досвід роботи з системами на основі Google Zanzibar (OpenFGA, SpiceDB, Authzed) у production
• Досвід роботи із service mesh (Istio/Envoy) та інтеграції авторизації на рівні mesh
• Знайомство з MCP (Model Context Protocol) та/або agent-based architectures і пов’язаними викликами авторизації
• Досвід у platform engineering або developer experience
• Досвід security auditing, роботи з compliance standards або регульованими середовищами (banking/fintech)
• Досвід проєктування multi-tenant authorization із delegation patterns
• Внесок у open-source інструменти авторизації
• Досвід автоматизації workflow за допомогою AI-powered tools або створення внутрішніх developer tools

Пропонуємо те, що має значення саме для тебе: 

• Конкурентна заробітна плата: гарантуємо стабільний дохід та річні бонуси за твій особистий внесок. Додатково, у нас діє реферальна програма винагороди за залучення нових колег до Райффайзен Банку
• Соціальний пакет: офіційне працевлаштування, 28 днів оплачуваної відпустки, додатковий “декрет” для татусів, та матеріальна допомога для батьків при народженні дітей
• Комфортні умови праці: можливість гібридного формату роботи, офіси забезпеченні укриттями та генераторами, забезпечення сучасною технікою
• Wellbeing програма: для всіх співробітників доступні медичне страхування з першого робочого дня; консультації психолога, нутриціолога чи юриста; дисконт програми на спорт та покупки; family days для дітей та дорослих; масаж в офісі
• Навчання та розвиток: доступ до понад 130 навчальних онлайн-ресурсів; корпоративні навчальні програми, онлайн бібліотека, програма менторства
• Крута команда: наші колеги — це спільнота, де вітаються допитливість, талант та інновації. Ми підтримуємо один одного, вчимося разом та зростаємо. Ти можеш знайти однодумців у понад 15-ти професійних ком’юніті, читацькому чи спортивному клубах
• Кар’єрні можливості: ми заохочуємо просування всередині банку між функціями
• Інновації та технології. Infrastructure: AWS, Kubernetes, Docker, GitHub, GitHub actions, ArgoCD, Prometheus, Victoria, Vault, OpenTelemetry, ElasticSearch, Crossplain, Grafana. Languages: Java (main), Python (data), Go(infra,security), Swift (IOS), Kotlin (Andorid) Datastores: Sql-Oracle, PgSql, MsSql, Sybase. Data management: Kafka, AirFlow, Spark, Flink, розвиваємо експертизу в AI та активно інтегруємо в процеси
• Програма підтримки захисників і захисниць: ми зберігаємо робочі місця та виплачуємо середню заробітну плату мобілізованим. Для ветеранів та ветеранок у нас діє програма підтримки, розвивається ветеранська спільнота Банку. Ми працюємо над підвищенням обізнаності керівників та команд з питань повернення ветеранів до цивільного життя. Райффайзен Банк відзначений як один з найкращих роботодавців для ветеранів (Forbes)

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.

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

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

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

We’re looking for a Senior Backend Engineer who’s eager to become one of our core team members and establish themselves as a significant building block of our products and company at this exciting and critical point in time before we reach greater heights.

Key Requirements:
🔹 Agentic Coding: Experience in using autonomous AI agents (e.g., Claude Code, Cursor, Aider) to plan, write, test, and debug code end-to-end;
🔹 6+ years of experience as a backend engineer;
🔹 Hands-on proficiency in Go — must have;
🔹 Hands-on proficiency in TypeScript — strong advantage;
🔹 Deep familiarity with SaaS architecture and development best practices;
🔹 Previous work with cloud platforms such as GCP, AWS, or others;
🔹 Proven ability to lead technical projects, set priorities, and own outcomes;
🔹 Solid understanding of microservices and event-driven architecture;
🔹 Ability to juggle multiple priorities gracefully;
🔹 B.Sc. in Computer Science or equivalent knowledge and experience;
🔹 English – Upper-Intermediate or higher;
🔹 Ability to work with US time zones (UTC-6 to UTC-7), with at least 2 hours of working-hours overlap.
​​​​​​​

Will be plus:
🔹 Experience in B2B & B2B2C Self-Serve SaaS;
🔹 Fintech/Payments industry background;
🔹 Experience working in a startup company.

What you will do:
🔹 Research, design, and implement high-performance resilient APIs and services;
🔹 Contribute to a positive and collaborative team environment by sharing your knowledge and expertise;
🔹 Collaborate with engineers and product managers to deliver robust solutions in short development iterations;
🔹 Develop maintainable and clean code with heavy reliance on developer testing;
🔹 Make thoughtful trade-offs based on business priorities, user needs, and a sustainable technical foundation;

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

Why Join Us?

At YozmaTech, we’re self-starters who grow together. Every day, we tackle real challenges for real products – and have fun doing it. We work globally, think entrepreneurially, and support each other like family. We invest in your growth and care about your voice. With us, you’ll always know what you’re working on and why it matters.
From day one, you’ll get:
🔹 Direct access to clients and meaningful products;
🔹 Flexibility to work remotely or from our offices;
🔹 A-team colleagues and a zero-bureaucracy culture;
🔹 Opportunities to grow, lead, and make your mark.

After you apply

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

Everyone’s welcome

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

Ready to build something meaningful?

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