Jobs Golang

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.

RedCore is an international business group that creates technological solutions for digital markets. Our products and services cover fintech, marketing, e-commerce, customer service, communications, and regulatory technologies.

We are looking for a Senior Go Engineers! 

Requirements:

• 4+ years of experience with Go programming language.
• Proven ability to design and implement scalable and reliable software solutions.
• Strong understanding of event-driven architecture.
• Experience with containerization and orchestration tools like Docker and Kubernetes.
• Hands-on experience with RDBMS and/or NoSQL databases.
• Strong understanding of event-driven architecture + hands-on experience with Event Brokers.
• Experience with observability — implementing logs, metrics, and tracing.
• Proficiency in working with cloud platforms such as Google Cloud Platform (GCP) and/or AWS.
• Proficient in using Git, GitLab, and GitLab CI for source control and continuous integration.
• Excellent problem-solving abilities.
• Strong time management and organizational skills to handle multiple tasks effectively.
• Upper-intermediate level of English, both written and verbal.
   

Nice to have:

• Familiarity with the Twelve-Factor App methodology.
• Knowledge of Cloud Events and GitOps practices.
   

Responsibilities:

• Develop high-performance, testable, and maintainable code to deliver new functionality.
• Conduct code reviews to ensure quality, maintain standards, and share knowledge across the team.
• Integrate industry-leading third-party services into the platform.
• Mentor team members and actively share knowledge to foster growth and collaboration.
• Propose and implement innovative technical initiatives to improve systems and processes.
   

Why Join Us:

• Flexible remote or hybrid working format based on your location.
• No Time Trackers: We value trust and focus on results.
• Career growth, professional development, and regular performance reviews.
   

Hiring Steps: HR Interview > Technical Interview (no test task, no live-coding needed) > Reference check > Offer
 

Our benefits to you:
☘️An exciting and challenging job in a fast-growing business group, the opportunity to be part of a multicultural team of top professionals in Development, Architecture, Management, Operations, Marketing, Legal, Finance and more

🤝🏻Great working atmosphere with passionate experts and leaders, sharing a friendly culture and a success-driven mindset is guaranteed

🧑🏻‍💻Modern corporate equipment based on macOS or Windows and additional equipment are provided

🏖Paid vacations, sick leave, personal events days, days off

💵Referral program — enjoy cooperation with your colleagues and get the bonus

📚Educational programs: regular internal training sessions, compensation for external education, attendance of specialized global conferences

🎯Rewards program for mentoring and coaching colleagues

✈️In-house Travel Service

🦄Multiple internal activities: online platform for employees with quests, gamification, presents and news, clubs for movie / book / pets lovers and more

🎳Other benefits could be added based on your location 
 

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;
 

Short overview of the project (What technology stack is used on the project, and length of the project)

AI tourism platform looking for a Team Lead Product Engineer who uses AI to ship fast.

📚 Our stack:

Backend: Go monorepo (no framework, 3+ services)

Hosting: PaaS-managed containers, local setup fully mirrors production via Docker Compose

Tools: Jaeger tracing, Betterstack (Logging, Alerting), Redis Asynq queue

Databases: PostgreSQL, Redis

AI tooling: Claude Code (mandatory)

🚢 Products you will lead a pod on:

An AI search & recommendation engine for major travel enterprises: heavy client integration work (SSO, security reviews, GDS integrations) with demanding enterprise customers

A content enrichment API: high-scale, data- and AI-focused backend work

Partner and supplier integrations, data ingestion pipelines, LLM providers

Employment and number of hours per week/month (part-time, full-time, freelance)

Engagement: full-time, 40 hours/week

Candidate’s location and required Time Zone for work

Location: remote, within ±3 hours of CET

Timezone is the main priority, so your usual scope of EU and Ukraine within the required overlap works well. 

Language of communication

Language: English required

Functional responsibilities (What will an employee do on the project?)

⚠️ European or African timezones (±3 hours from CET) Available full-time (40 hours/week)

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

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

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

What you'll actually do:

Be the spokesperson for your pod, internally with product, design and leadership, and externally with clients and partners

Coordinate work across the pod: break initiatives into chunks, sequence them, surface blockers and facilitate hand-offs (lightweight project management, we deliberately have no project managers)

Gather client requirements first-hand and funnel them straight into the pod so nothing gets lost in translation

Represent your pod in product planning sessions and bring a strong product-driven point of view to scoping and trade-offs

Help pod members with product decisions and prioritisation, enabling engineers who may be technically stronger than you

Contribute hands-on as an engineer: own features end-to-end, use Claude Code to generate Golang backend code, review AI output for quality and architectural fit

Join client meetings to align on requirements, report on delivery and keep the relationship professional and calm

Requirements for a candidate

Min 5 years of experience

2-3+ years of technical leadership experience leading a team, squad, pod or similar unit (a hard must, think team lead or early-stage engineering manager)

A developer's background (5 years minimum): you have seen production reality with your own hands before moving towards leading people

A genuinely product-driven mindset: you think about user value and business outcomes before implementation

Comfort facilitating and coordinating a pod without relying on formal authority

Willingness and ability to take part in client meetings and act as the external face of your pod

Excellent spoken and written English for planning sessions, stakeholder updates and client conversations

Ownership mentality with a strive for elegantly simple, high-quality solutions; you test your own work thoroughly since we have no QA team

Proven experience using Claude Code, share specific examples

Solid Golang experience, you'll review AI's code and you must understand how it works

Ability to do on-call once in a while to help maintain our platform's reliability & uptime

Must-Have Requirements (Team Lead — no flexibility on any)

Go (Golang): Real production experience, not just personal projects. No flexibility on other technologies.

AI/backend engineering: Deep knowledge of building and productionizing complex AI systems — observability, reliability, quality

Product mindset: Ability to think beyond engineering toward product outcomes

Leadership: Capable of leading without needing coaching or internal mentoring

English communication: Very strong, given client-facing responsibilities

Minimum 5 years of experience across the board

Candidates should be responsible for testing their own code — QA ownership expected

The Team Lead will head a small pod (not a traditional manager with direct reports)

Client-facing responsibilities begin from onboarding, with full client-facing ownership expected to grow over time

Also they will have on-call duties (now it’s during working hours and weekends, rotation among team members, but later they want to have 24/7 on call, so one person will be on-call for 24 hours (probably) and it will be compensated extra). 

Nice-to-Have

German language: A significant bonus but not required — the one criteria the client can flex on

Any special requirements for the person 

❤️ You are a great fit if you:

Made the classic developer's fork-in-the-road decision, lifelong engineer or leading people, and chose people, clients and product

Are energised by product planning sessions and have opinions about what the pod should build next, not just how

Are comfortable being the face of your pod, in internal planning rooms and on calls with enterprise clients

Enjoy enabling engineers who are technically stronger than you

Overview

We are looking for a Senior Engineer to take primary ownership of its Go-based Virtual Signer and help maintain shared signing SDKs and integrations across server and mobile platforms.
 

The Virtual Signer participates in MPC and threshold signing alongside mobile devices. This is an opportunity to take ownership of a security-critical component, strengthen its production reliability, and contribute to future transaction approval and post-quantum signature capabilities.

About the Environment:
The Go-based Virtual Signer orchestrates signing between server and mobile participants. It integrates with MPC and threshold-signature libraries, supports encrypted storage and must recover safely from interrupted signing sessions and other failures.

The component has been rebuilt over roughly the past year and is around MVP stage. It is working, with outstanding pull requests, logging and visibility improvements, and race conditions to address. The incoming engineer may have limited handover from the previous maintainer.

The engineer will work with backend and mobile engineers, testing support and a cryptographer who also maintains the repository. Collaboration across UK and Eastern Canada working hours will be important.

The environment includes Go, Linux and Docker, with shared SDKs and bindings for Swift, Kotlin and JavaScript/TypeScript. Jira, Slack, GitHub and Google Workspace are used for collaboration.

The initial focus is a robust production baseline: understand the codebase, resolve reliability and security issues, improve tests and support releases. Later work may include transaction approval functionality and post-quantum signing in collaboration with cryptography specialists.

Responsibilities:
Virtual Signer Engineering
— Maintain and improve the Go Virtual Signer, including signing orchestration, communication between participants, encrypted storage and recovery from failures.
— Investigate concurrency, timeouts, interrupted sessions, network failures and service restarts; review outstanding pull requests and address race conditions.
— Improve logging and visibility, assess the existing implementation critically and make careful, maintainable changes.
— Support agreed transaction approval features and future post-quantum signature work.
 

Cryptography, SDKs & Cross-Platform Integration
— Maintain integrations with MPC and threshold-signature libraries, working with cryptography specialists where changes affect protocol security.
— Contribute to shared SDKs and bindings connecting Go with Swift, Kotlin and JavaScript/TypeScript.
— Work with backend and mobile engineers to preserve API compatibility and consistent signing behaviour across releases.
 

Quality, Testing & Operations
— Improve automated tests for signing correctness, failure recovery and interoperability between virtual and mobile signers.
— Support Linux and Docker deployments, dependency upgrades, monitoring, release processes and operational documentation.
— Investigate production issues and occasionally assist with customer setup or logging problems.

Ownership & Technical Judgement
— Take primary ownership of a security-critical codebase with limited handover and independently establish a robust production baseline.
— Assess technical risks and trade-offs, explain decisions clearly and make incremental changes with sound security judgement.
— Collaborate pragmatically with backend, mobile, testing and cryptography specialists across time zone

Requirements:
Essential Technical Experience
— Strong hands-on production Go, including goroutines, channels, context cancellation, race detection, profiling and resource management.
— Experience owning production services, diagnosing complex failures and delivering well-tested fixes.
— Distributed-systems knowledge, including asynchronous messaging, retries, idempotency, state management and partial failures.
— Practical security engineering: authentication, encrypted storage, sensitive-data handling and safe logging.
— Applied cryptography concepts, including digital signatures, hashing, key management and signature verification.
— Automated testing, CI/CD, Linux, containers and production observability.
— Ability to understand an established codebase, make careful incremental changes and explain technical decisions clearly.

Strongly Preferred/Desirable Technical Experience
— JavaScript/TypeScript SDKs and mobile bindings, including asynchronous APIs, packaging, compatibility and Go/mobile interoperation.
— React Native/Expo, Swift or Kotlin; experience with mobile lifecycle, secure storage or native modules.
— MPC or threshold signatures, distributed key generation and changes to signing participants.
— Blockchain transaction signing, including signing payloads and chain-specific requirements.
— Confidential computing and hardware attestation, particularly AMD SEV-SNP, are especially valuable among the desirable skills.
— MQTT, Protocol Buffers, Prometheus or OpenTelemetry; familiarity with post-quantum signature schemes is also desirable for the longer-term roadmap.
 

Market Experience
— Experience with digital asset infrastructure, blockchain signing or MPC is valuable, but the priority is strong production Go and sound security judgement.
— Relevant experience in other security-critical distributed systems can also demonstrate fit.
— Candidates do not need experience with every desirable technology; evidence of ownership, careful delivery and learning across platform boundaries matters.

Soft Skills 
— Independent and able to understand an existing repository with limited handover.
— Strong security judgement, attention to correctness and a careful approach to critical signing systems.
— Able to assess implementation choices critically and explain risks and trade-offs clearly.
— Pragmatic and collaborative when working with backend, mobile and cryptography specialists.
— Comfortable diagnosing production failures and improving reliability through tested changes.
— Effective remote communication and flexibility for collaboration across UK and Eastern Canada working hours.
— Able to take ownership without relying on detailed instructions or extensive handover.
— Willing to investigate occasional customer setup or logging issues.

Assessment Process
Stage 1: CV screening.
Stage 2: First-stage technical interview (30 mins).
Stage 3: Technical Interview (1 hour) including pair-programming.
Stage 4: Cultural alignment review (30 mins).

RedCore is an international business group that creates technological solutions for digital markets. Our products and services cover fintech, marketing, e-commerce, customer service, communications, and regulatory technologies.

We are looking for a Team Lead GO to join our team!

Requirements:

- 3+ years of development experience with Go;

- Strong time management and organisational skills;

- Ability to design and implement scalable and reliable software solutions;

- Excellent problem-solving skills;

Git, GitLab, GitLab CI;

- Experience with multiple databases (RDBMS, NoSQL, Redis) and messaging services (Kafka, NATS), ideally run in a cloud environment;

- Strong system design skills;

REST/RPC transports;

- Practical knowledge of containers (Docker, Kubernetes);

- Experience with microservices design and development;

- Understanding of the importance of a well-organised codebase and documentation;

- Strong analytical skills and an open-minded, creative team player mindset;

- English: Upper-Intermediate.

Will be plus:

- Understanding of event-driven architecture;

- Understanding of Twelve-Factor App methodology;

CloudEvents;

- Experience working with cloud services (GCP/AWS);

- GitOps;

- Terraform;

- Helm/ArgoCD;

- Grafana/Tempo/Loki + Prometheus;

- High-load systems;

- Experience coordinating complex third-party dependencies.

Soft Skills

- Responsibility;

- Sociability;

- Proactivity;

- Self-organization.
 

Responsibilities:

- A Team Lead is the day-to-day technical coordinator of a specific team, acting as the execution arm of the EM and ensuring that the team is focused, unblocked, and working efficiently toward shared goals.

- They ensure smooth operation, coordination, and quality within the team, while escalating architectural, technical, or people matters to the EM.

- They are accountable for team delivery, individual growth, and operational excellence within their scope.

Technical Leadership, Ownership & Support:

- Own the day-to-day technical execution within the team, from new features to bug fixes and quality improvements.

- Ensure the team's code quality through reviews and enforcement of best practices (testing, security, maintainability). 

- Drive code reviews, enforce coding standards, promote testing and documentation, and help the team write robust, production-ready code.

- Support and contribute to hands-on coding and testing. Lead by example through hands-on development, particularly for complex or critical features.

- Own delivery of team components and backend capabilities as defined in sprint goals.

- Facilitate design discussions within the team; escalate complex architecture topics to EM or Architect.

- Raise and track technical debt; provide input to the EM for prioritization.

- Facilitate task prioritization, workload balancing, and sprint planning. - Track progress, identify risks, and resolve blockers.

Planning & Delivery Coordination:

- Ensure alignment with PMs, QA, DevOps, and BAs on deliverables. 
- Work closely with PMs, EMs, QAs, and BAs to ensure that deliverables are clearly understood, scoped, and assigned.

- Break down work items into deliverable tasks in collaboration with PMs and EMs, balancing workload fairly across developers and helping manage priorities during sprints.

- Actively participate in sprint planning, stand-ups, and retrospectives.

Monitor team progress and adjust scope or priorities when needed, escalating blockers to the EM.

- Maintain transparency on delivery status and keep stakeholders informed of changes, delays, or challenges.

- Coordinate hand-offs and dependencies within the team and with adjacent teams.

People Leadership & Development:

- Directly manage engineers on the team (Juniors, Middles, Seniors).

- Conduct 1:1s, performance evaluations, career growth discussions, and coaching.

- Provide day-to-day mentoring and guidance to developers, especially junior and mid-level engineers, by answering questions, sharing context, and offering feedback.

- Foster a positive and inclusive team culture; ensure psychological safety, motivation, and team morale.

- Participate in team growth activities, including hiring, interviewing, candidate evaluation, and onboarding of new engineers.

- Identify talent and growth opportunities; support professional development. 

- Partner with EM and Domain Lead to hire, onboard, and retain high-quality engineers.

- Encourage a sense of ownership and pride in the team's work; celebrate wins and learn from failures together.

Communication & Reporting:

- Keep EM and PM informed of team progress, risks, and dependencies.

- Share updates from EM or domain leads with the team.

- Act as the go-to person for team-level updates in cross-team syncs or sprint reviews.

- Participate in cross-team discussions to ensure alignment with domain strategy and priorities.

Success Criteria:

- The team consistently delivers on commitments with high quality.

Engineers are growing in skills and autonomy.

- The team operates efficiently, collaborates effectively, and maintains a healthy culture.

- Stakeholders trust the team for delivery, transparency, and problem-solving.

Our benefits to you:
☘️An exciting and challenging job in a fast-growing business group, the opportunity to be part of a multicultural team of top professionals in Development, Architecture, Management, Operations, Marketing, Legal, Finance and more

🤝🏻Great working atmosphere with passionate experts and leaders, sharing a friendly culture and a success-driven mindset is guaranteed

🧑🏻‍💻Modern corporate equipment based on macOS or Windows and additional equipment are provided

🏖Paid vacations, sick leave, personal events days, days off

💵Referral program — enjoy cooperation with your colleagues and get the bonus

📚Educational programs: regular internal training sessions, compensation for external education, attendance of specialized global conferences

🎯Rewards program for mentoring and coaching colleagues

✈️In-house Travel Service

🦄Multiple internal activities: online platform for employees with quests, gamification, presents and news, clubs for movie / book / pets lovers and more

🎳Other benefits could be added based on your location

We are looking for a Senior Backend Engineer to join the Core Banking Services team and help build and scale a high-performance Banking-as-a-Service (BaaS) platform.

The team develops secure, highly available backend services that enable internal products and partner banks to manage customers, accounts, and core banking processes. You will work on distributed systems supporting critical financial operations, with a strong focus on scalability, reliability, security, and clean architecture.
 

Responsibilities:

• Design, develop, and maintain scalable backend services using Node.js and TypeScript.
• Build and maintain REST APIs and event-driven services within a serverless AWS architecture.
• Work with AWS services such as Lambda, SQS, API Gateway, EventBridge, DynamoDB, and S3.
• Contribute to the design and evolution of distributed systems supporting core banking processes.
• Take part in architectural and technical decisions, solution design, and technical documentation.
• Collaborate with other engineering teams and external partners to define and manage system integrations and dependencies.
• Develop reliable and well-tested solutions, covering unit, integration, and system testing.
• Work with Infrastructure as Code and contribute to improving CI/CD pipelines and development processes.
• Participate in threat modeling and contribute to building secure and resilient services.
• Take ownership of production reliability, including participation in an on-call rotation, incident investigation, root-cause analysis, and hotfixes.
• Proactively identify opportunities to improve system performance, reliability, and engineering practices.
   

Requirements:

• 5+ years of commercial Node,js backend development experience.
• Strong hands-on experience with TypeScript.
• Solid experience building distributed and event-driven systems.
• Strong practical experience with AWS, particularly serverless services such as Lambda, SQS, API Gateway, EventBridge, DynamoDB, and S3.
• Experience with Infrastructure as Code, preferably Terraform and/or AWS CDK.
• Good understanding and practical application of software design patterns and clean architecture principles.
• Experience with RESTful API design and OpenAPI.
• Strong testing experience, including unit and integration testing.
• Experience working with event-driven architectures and messaging technologies such as Kafka.
• Strong problem-solving and analytical skills.
• Ability to take ownership of technical solutions and work independently.
• Excellent communication and collaboration skills.
• Fluent English.
   

Nice to Have:

• Experience with monorepo setups, such as pnpm workspaces or similar.
• Experience with MySQL and ORM technologies such as Prisma.
• Experience with DynamoDB or other NoSQL databases.
• Previous experience in banking, fintech, payments, or other highly regulated domains.

We are building a distributed GPU-compute marketplace. Buyers launch GPU workloads and inference deployments. Provider nodes run workloads through a Go control plane and a Linux-based Rust agent.

We are hiring a Senior Go Backend Engineer to own correctness-critical backend systems: job lifecycle, placement, billing, provider operations, and API contracts.

You will work directly with the CTO on a system where transactional correctness matters. A duplicate request, failed worker, agent restart, or incomplete usage record must not create free compute, double-charge a buyer, or release a GPU while work is still running.

What you will own

- Go services and APIs for buyers, providers, operators, and agents.

- PostgreSQL data models, migrations, transactions, locking, and query performance.

- Job lifecycle and placement across GPU provider nodes.

- Prepaid billing, reservations, settlement, refunds, reconciliation, and audit records.

- Background workers, idempotent retries, and recovery after partial failure.

- Secure agent APIs using mTLS and signed short-lived credentials.

- Tests that prove correctness under retries, concurrent requests, and failure cases.

- Clear API contracts, OpenAPI documentation, metrics, and operational diagnostics.

Our stack

- Go backend services.

- PostgreSQL, Redis, NATS, and JetStream.

- Rust agent on Linux GPU hosts.

- Kubernetes, Prometheus, Grafana, and GCP.

- Next.js frontend.

What we need

- 5+ years of backend engineering experience.

- Strong production Go experience.

- Strong PostgreSQL experience, including transactions, indexes, migrations, and query analysis.

- Experience building distributed or event-driven systems.

- Experience designing idempotent APIs and handling retries or partial failures.

- Strong testing discipline, including integration tests.

- Experience with Redis, message queues, or NATS.

- Ability to reason clearly about correctness, security, and money movement.

- Clear written communication and ownership from design through production support.

Nice to have

- Payments, billing, ledger, marketplace, fintech, or accounting-system experience.

- Kubernetes, GCP, and production observability experience.

- mTLS, cryptography, signed credentials, or security-sensitive APIs.

- Rust, Linux, GPU infrastructure, or distributed-systems operations.

This is a hands-on senior role. You will ship production Go code, review critical changes, investigate failures, and improve the system so that it stays correct under real production conditions.

Our client is the leader in the Early Childhood Education (ECE) sector, providing the most widely used developmental assessment and curriculum system in the US. They are looking for a talented, innovative and creative Golang Developer to join the platform team. They believe that great technology experts are also software generalists who are unafraid to jump up and down the stack to solve the problems that come their way. If you thrive in fast-paced environments, and like working on software that supports millions of daily users, then this opportunity is exactly what you’ve been looking for!

Their Software Engineering team is responsible for building out SaaS solutions used by educational organizations across the globe. The team works on a wide variety of projects, solving existing problems and enabling new business objectives. Their platform is evolving, so you need to be someone who can build new functionality and learn new technologies quickly as well as be able to maintain and extend existing code to support organizational needs.

As a Senior Golang Engineer, you will:

• Develop new features, components, and modules to support organizational growth;
• Implement a robust set of services and APIs to power high-traffick SaaS platform;
• Participate in planning, analysis, and design of new software solutions;
• Investigate, troubleshoot, and remedy performance bottlenecks in the application flow;
• Learn new technologies and keep up with both traditional and emerging best practices;
• Works independently and collaborates with other team members to ensure successful project delivery.

Qualifications:

• 5+ years of production experience in software engineering and SaaS product development;
• Senior-level knowledge of Golang;
• Strong knowledge of relational databases (ex. PostgreSQL);
• Strong communication and listening skills; ability to communicate complex technical problems, root cause analysis, and propose solutions;
• Proficiency with Python preferred;
• Front-end development experience preferred;
• Experience using AI developer tools (e.g., Codex), with an AI-forward mindset;
• At least Upper-intermediate level of English (B2 or higher);
• Experience with Agile methodology and software development;
• Self-starter with a strong sense of collaboration, teamwork, and accountability;

• Working knowledge of AWS and familiarity with its services (Kubernetes, Redis, SQS/SNS, etc.);

   

We offer:

• Competitive market salary;
• Fully remote work;
• Convenient and somewhat flexible work hours (you will have to work until 8 pm Kyiv time GMT+3, or 1 pm EST);
• 28 days of paid unbillable time per year;
• Working on a very socially valuable product, alongside a highly professional, US-based, international team;
• Interesting challenges and the ability to grow and learn.

Gensoft is looking for a Senior Go Engineer for a long-term client project: a Go service that orchestrates cryptographic signing between distributed participants, including mobile clients. The service is already running in early production, and we need an engineer who can take ownership of it and bring it to a robust production baseline.

ABOUT THE PROJECT

- A Go-based service that orchestrates cryptographic signing between distributed participants, including mobile clients. It integrates with multi-party signing libraries, supports encrypted storage and must recover safely from interrupted sessions and other failures.
- The service works and is at an early production stage. There are open pull requests, observability improvements and concurrency issues to address. Handover from the previous team may be limited.
- You will work with backend and mobile engineers, QA and cryptography specialists. Collaboration across UK and North American working hours is important.
- Stack: Go, Linux, Docker, shared SDKs and bindings for mobile and web platforms.
- Initial focus: understand the codebase, resolve reliability and security issues, improve tests and support releases. Later work may include new product features and longer-term cryptography roadmap items.

RESPONSIBILITIES

Core service engineering
- Maintain and improve the Go service: signing orchestration, communication between participants, encrypted storage and failure recovery.
- Investigate concurrency, timeouts, interrupted sessions, network failures and service restarts; review open pull requests and fix race conditions.
- Improve logging and observability, assess the existing implementation critically and make careful, maintainable changes.
- Contribute to new features and future cryptography work as the roadmap develops.

Cryptography, SDKs and cross-platform integration
- Maintain integrations with multi-party / threshold signing libraries, working with cryptography specialists where changes affect protocol security.
- Contribute to shared SDKs and bindings connecting Go with mobile and web clients.
- Work with backend and mobile engineers to preserve API compatibility and consistent behaviour across releases.

Quality, testing and operations
- Improve automated tests for signing correctness, failure recovery and interoperability between server and mobile components.
- Support Linux and Docker deployments, dependency upgrades, monitoring, release processes and operational documentation.
- Investigate production issues and occasionally help with customer setup or logging problems.

Ownership and technical judgement
- Take primary ownership of a security-critical codebase and independently establish a robust production baseline.
- Assess technical risks and trade-offs, explain decisions clearly and make incremental changes with sound security judgement.
- Collaborate pragmatically with backend, mobile, QA and cryptography specialists across time zones.

REQUIREMENTS

- Strong hands-on production experience with Go: goroutines, channels, context cancellation, race detection, profiling and resource management.
- Experience owning production services, diagnosing complex failures and delivering well-tested fixes.
- Distributed systems knowledge: asynchronous messaging, retries, idempotency, state management and partial failures.
- Practical security engineering: authentication, encrypted storage, sensitive data handling and safe logging.
- Applied cryptography concepts: digital signatures, hashing, key management and signature verification.
- Automated testing, CI/CD, Linux, containers and production observability.
- Ability to understand an established codebase, make careful incremental changes and explain technical decisions clearly.
- English at Upper-Intermediate level or higher.

NICE TO HAVE

- SDK development for JavaScript/TypeScript or mobile platforms (Swift, Kotlin), including asynchronous APIs, packaging and Go interoperability.
- Cross-platform mobile development, secure storage or native modules.
- MPC or threshold signatures, distributed key generation (DKG).
- Blockchain transaction signing.
- Confidential computing and hardware-based attestation.
- Messaging protocols, Protocol Buffers, Prometheus or OpenTelemetry; interest in emerging signature schemes.

WHO WILL BE A GOOD FIT

- Experience with digital asset infrastructure or MPC is valuable, but the priority is strong production Go and sound security judgement.
- Relevant experience in other security-critical distributed systems also counts.
- You do not need experience with every "nice to have" technology. Evidence of ownership, careful delivery and learning across platform boundaries matters more.
- You are independent and can get up to speed on an existing repository with limited handover.
- You pay attention to correctness and take a careful approach to critical systems.
- You can assess implementation choices critically and explain risks and trade-offs clearly.
- You are pragmatic and collaborative with backend, mobile and cryptography specialists.
- You are comfortable diagnosing production failures and improving reliability through tested changes.
- You communicate effectively in a remote setup and are flexible to overlap with UK and North American working hours.

WHAT WE OFFER

- Fully remote work.
- Real ownership of the codebase and influence on technical decisions.
- Work alongside strong backend and mobile engineers, QA and cryptography specialists.

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.

We are looking for a Staff Software Engineer to take technical ownership of a new component of an enterprise network security platform operating across complex IT, OT and IoT environments.

You will join at the beginning of a new product component and engineering team, designing the architecture and building the solution from the ground up.

This is a hands-on technical leadership role, not people management. You’ll work closely with Product, QA and other engineering teams while remaining deeply involved in architecture and coding.

What You’ll Do

• Design and build a new platform component from scratch.
• Own architecture and key technical decisions through production implementation.
• Develop core backend and infrastructure components primarily in Go.
• Work with the platform’s data plane, distributed systems and data flows.
• Build scalable, reliable services using Kubernetes and cloud-native infrastructure.
• Work with PostgreSQL, APIs and service-to-service communication.
• Provide technical direction as the new engineering team grows.
• Use modern development approaches, including AI-assisted coding tools such as Claude Code.

What We’re Looking For

• Experience as a Staff / Principal / Lead Engineer, Software Architect, or equivalent senior hands-on role.
• Excellent Go / Golang skills — core requirement.
• Strong software architecture and system design experience.
• Proven experience designing and building complex distributed systems.
• Strong backend and infrastructure engineering background.
• Hands-on experience with Kubernetes and cloud-native environments.
• Experience with PostgreSQL and production data architecture.
• Good understanding of data plane architecture, networking, APIs, concurrency, performance, scalability and reliability.
• Ability to turn ambiguous requirements into architecture and working production systems.
• High degree of technical ownership and independence.
• Comfortable working in a fast-moving startup environment with a strong delivery focus.

Nice to Have

• Python and/or Java development experience.
• Experience with networking, cybersecurity or infrastructure platforms.
• Experience with microsegmentation, policy enforcement or similar network security systems.
• Experience with Claude Code or other AI coding agents.
• Public technical leadership, such as conference speaking or engineering community contributions.

Other details:

Location & Working Model

• CET timezone.
• Kraków is preferred, with weekly office collaboration.
• Strong candidates elsewhere within the required time zone can be considered.
• B2B contract with a US entity.
• Output-oriented working model.
• Company laptop provided.

Interview Process

1. 30-minute discussion with engineering leadership.
2. Technical deep dive with live coding and architecture discussion.
3. Final technical/culture discussion if needed.

English - B2-C1
Rate - Flexible

We are looking for a Senior Go Developer to join our engineering team and work on a long-term product development project.
 

Requirements

• 5+ years of commercial software development experience
• Strong hands-on experience with Go / Golang
• Experience building and maintaining production backend systems
• Good understanding of software architecture and development best practices
• Experience designing and developing APIs
• Ability to write clean, maintainable and well-tested code
• Experience working with Git and modern development workflows
• Strong problem-solving skills
• Ability to work independently and take ownership of technical tasks
• Good communication skills and ability to collaborate with a development team
   

Responsibilities

• Develop and maintain backend services using Go
• Design and implement new features and APIs
• Participate in architectural and technical decisions
• Write and review production-quality code
• Improve system reliability, performance and maintainability
• Collaborate with other engineers and stakeholders
• Contribute to technical documentation and development best practices
   

Tech Stack

• Go / Golang
• Backend / APIs
• Git
• Modern software architecture

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.

Project Description:

We're building a Cloud Observability platform for market leading large Germany based company with 440,000 customers worldwide.
Originally known for leadership in enterprise resource planning (ERP) software, the company has evolved to become a market leader in end-to-end enterprise application software, database, analytics, intelligent technologies, and experience management. A top cloud company with 200 million users worldwide, the company helps businesses of all sizes and in all industries to operate profitably, adapt continuously, and achieve their purpose.

Responsibilities:

• Lead sprint-based feature development for routing and collector-as-a-service platforms
• Develop Kubernetes operators using controller-runtime / Operator SDK (kubebuilder)
• Design and implement CRDs & Admission Webhooks
• Build custom OpenTelemetry Collector distributions and exporters
• Develop frontend components using React / TypeScript / Tailwind / Vite / TanStack
• Implement and maintain Istio service mesh and mTLS/OIDC/JWT security
• Integrate with Open Service Broker / Cloud Broker APIs and enterprise platform services
• Maintain CI/CD pipelines using GitHub Actions and ArgoCD
• Contribute to architecture decisions and create ADRs for major changes
• Participate in developer on-call rotation outside core hours

Mandatory Skills Description:

• Go language development
• Node.js / TypeScript development
• Kubernetes container orchestration
• OpenTelemetry (OTEL) observability
• controller-runtime / Operator SDK (kubebuilder)
• CRDs & Admission Webhooks
• GitHub Actions and ArgoCD CI/CD
• Kustomize configuration management
• Istio / Service Mesh infrastructure
• mTLS / OIDC / JWT / OAuth2 security
• PostgreSQL and Kafka
• ModelContext Protocol (MCP) AI framework
• React / Frontend Stack (TS, Tailwind, Vite, TanStack)
• Open Service Broker / Cloud Broker APIs

Nice-to-Have Skills Description:

• OTEL Collector custom distributions and exporters
• gRPC networking
• Gardener cluster lifecycle management
• GCP / Azure / AWS cloud platforms
• Prometheus / Grafana / Jaeger / Splunk monitoring
• Enterprise platform integration (BTP or similar)
• AI-assisted / spec-driven development practices
• NATS messaging, Helm, HashiCorp Vault, Kyverno, HAProxy
• Sovereign / Air-gapped architecture
• Cost Management & FinOps