Jobs at Djinni

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

About the Project

You’ll build and lead a SOC team from scratch for a global SaaS company (unicorn-stage, 20+ offices, Fortune 500 clients). The customer Security team is super strong and the stack is superior. As the first SOC leader (in charge of 6 Tier 2 analysts), you’ll upgrade existing response processes so the internal team can focus on security engineering.

You’re the escalation point for your analysts and the client’s IT, DevOps, and App Security teams, and you own 24/7 coverage, SOC KPIs, and the feedback loop to Security Engineering. This is not a ticket-closing role: you set the tone for how incidents are handled.

What You’ll Do

• Lead the team: run the L2 analysts day-to-day (prioritization, playbooks, escalations), hold team syncs and handovers, and mentor and onboard analysts
• Own 24/7 coverage: build and maintain shift schedules and on-call rotations so the SOC is always staffed
• Own incident response: lead the full lifecycle from triage to closure, coordinate high-severity events and run post-incident reviews
• Investigate hands-on: be the escalation point and work complex alerts alongside analysts, beyond Tier 2 capability
• Measure and report: track team and individual performance and out comes against KPIs and SLAs (MTTA, MTTR, SLA compliance, false positive rate, backlog) and report to management and the client
• Bridge to Security Engineering: turn analyst pain points (false positives, alert fatigue, detection gaps) into detection tuning and improvement suggestions.
• Communicate clearly: work with the client’s security team at technical and managerial level, with honest status updates, including when something is unknown

What You Bring

Hard requirements (non-negotiable):

• 5+ years in SOC / incident response roles, including prior Tier 2/3 analyst experience. Not just monitoring: actual IR ownership
• 2+ years of team lead or management experience in a SOC, including shift lead or mentoring responsibility
• Proven experience building and running 24/7 shift schedules and on-call rotations, and keeping coverage intact in practice
• Proven experience owning SOC KPIs and SLAs (MTTA, MTTR, SLA compliance): you can show how you measured a team and improved it
• Experience leading or coordinating a team during an active incident, and the ability to describe it step by step
• Cloud / AWS security experience: ability to investigate and respond to cloud alerts on day one
• SaaS investigation experience
• SIEM hands-on: Splunk (required), with the ability to write and read SPL queries. CrowdStrike SIEM is a strong plus
• EDR: Microsoft Defender and/or CrowdStrike
• Working knowledge of both Windows and macOS environments
• Strong communication skills, bridging SOC operations and Security Engineering. Intellectual honesty: you say “I don’t know” when you don’t know

Strong plus:

• Identity platforms: Okta, Azure AD
• SOAR automation and threat hunting
• Experience building a SOC at level 4-5 based on SOC-CMM
• Feeding analyst findings into detection engineering (tuning, new detections)

Things that won’t work here

• Only closing alerts without owning the IR process
• Never having owned a shift schedule, on-call rota or KPI reporting
• Managing from the sidelines instead of investigating alongside the team
• Confident wrong answers instead of acknowledged gaps
• No ability to describe team coordination during a real incident

Tech Stack

Splunk · Microsoft Defender · CrowdStrike · Okta · AWS

What We Offer

• Superior technical team and a great customer with massive modern infrastructure
• AI everywhere, with the ability to automate every step: work smarter, not harder
• Real ownership from day one to build the SOC processes, coverage model and KPIs
• Direct collaboration with the client’s senior security team
• Warsaw office (day shifts), with a flexible on-call and night coverage model you design with your team
• Relocation support

We’re hiring VIP Managers for a new international iGaming project focused on DACH, Scandinavia, and the UK.

What you’ll do:
• Build and maintain relationships with VIP players
• Communicate via calls, messengers, SMS & email
• Retain active and reactivate inactive players
• Work with personalized bonuses and offers
• Provide a high level of personalized customer service

Requirements:
• Fluent German + English/Russian 
• Strong communication and interpersonal skills
• iGaming / VIP / Sales / Customer Support experience is a plus, but not required

Conditions:
• Fully remote
• Location doesn’t matter
• Up to $2,000 + bonuses depending on experience & language level
• Crypto payments
• New team — great opportunity to join the project at an early stage

Soft Does | Remote | Schedule: 16:00 – 00:00 (Kyiv time)
 
Come Back Agency is a recruitment agency that helps IT companies grow their teams with the right people. Right now, we are looking for a Content Manager for our client — Soft Does.

Soft Does is an IT company whose services are used by businesses across the US. We are actively scaling our organic presence and content marketing setup: hundreds of SEO-optimized service pages are already live, and we are expanding into new technology pages and blogs.

In this role, you will act as a core content specialist, combining hands-on content creation with task coordination and mentoring support for team members. You will work in close collaboration with the CEO and the SEO lead.

About the Role
 
Your primary goal will be creating and editing content, coordinating processes, and supporting the team. The main focus is hands-on SEO content creation for the US market, combined with day-to-day team coordination and mentoring.

What You'll Do
 

• Content Creation & Optimization: Write, edit, and optimize SEO texts using Surfer SEO, Gemini, and ChatGPT (deep rewriting, removing cliches, adapting drafts to our structure).
• CMS Work: Publish and format pages in CMS (WordPress/Shopify) using ready-made templates with high attention to detail.
• Coordination & Mentoring: Help colleagues with daily tasks, support onboarding, and share editorial quality standards.
• Keyword Work: Select and analyze keywords to optimize pages for both Google and AI search.
• Process Enhancement: Manage your own task flow independently, track performance metrics, and improve content creation speed.

What We're Looking For
 

• Experience: 1+ year of hands-on content creation and editing experience, supported by relevant work samples. Strong organizational and communication skills, with an interest in mentoring and team coordination. Previous leadership experience is a plus.
• US Market Focus: Experience creating B2B/IT content tailored specifically for the US market.
• SEO & AI Skills: Practical experience with SEO content optimization, keyword research, CMS publishing, and AI-assisted writing. Ability to fact-check, rewrite, and improve AI-generated drafts. Experience with Surfer SEO or similar tools is a plus.
• Language Proficiency: Upper-Intermediate (B2) English or higher — required for direct writing, thorough editorial control, and professional communication.
• Independence & Results: High self-organization, ability to manage your task flow independently, and a result-oriented approach without micro-management.
• Attention to Detail: Meticulous approach to quality, formatting, and structural accuracy across large volumes of web pages.

Nice to Have
 

• Experience working with or handling social media channels (Instagram, Facebook, LinkedIn) for IT or B2B brands.
• Familiarity with Google Search Console and web analytics tools.
• Background in IT services, agency environments, or tech companies.

What We Offer
 

• Work Schedule: Aligned with US business hours, 16:00 – 00:00 Kyiv time.
• Remote Work: 100% remote working format.
• Professional Growth: An opportunity to develop leadership skills through hands-on content work, mentoring, and team coordination.
• Supportive Environment: Paid vacation and sick days, structured onboarding, and continuous English language learning support.

Hiring stages: Recruiter screening → Technical task → Technical interview.
 
Apply with your resume and a short note outlining your relevant experience. You can also submit it through our website at comeback.ua. Selected candidates will be contacted by Come Back Agency.

PwC is a global network of more than 370,000 professionals in 149 countries that turns challenges into opportunities. We create innovative solutions in audit, consulting, tax and technology, combining knowledge from all over the world.

PwC SDC Lviv, opened in 2018, is part of this global space. It is a place where technology is combined with team spirit, and ambitious ideas find their embodiment in real projects for Central and Eastern Europe.

Why is it yours?

PwC SDC Lviv is not just a job. This is an opportunity:

• To really feel what it is like to work in an international company.
• Learn practical skills that will be relevant in a constantly changing world.
• To be part of a team that values your ideas and supports your growth.

What do we guarantee?

• Work format: Remote or in a comfortable office in Lviv - you choose.
• Development: Personal development plan, mentoring, English and Polish language courses.
• Stability: Official employment from day one, annual review of salary and career prospects.
• Corporate culture: Events that unite the team and a space where everyone can be themselves.

What awaits you?

In this role, you will combine team coordination responsibilities with hands-on involvement in billing operations. You will support the team in achieving operational goals, ensure the smooth execution of billing processes, and collaborate with clients and internal stakeholders to resolve issues and improve service quality.
 

Responsibilities:

• Coordinate the team’s workload and support daily billing operations.
• Communicate with clients to resolve billing-related issues and handle complex cases effectively.
• Conduct regular one-to-one meetings with team members, providing feedback and support for their professional development.
• Contribute to process optimisation initiatives and the implementation of improvements across the team.

Requirements:

• Previous experience in people coordination, task allocation, or team support activities.
• Experience working with billing, invoicing, or financial processes.
• Proficient in Microsoft Office applications, particularly Excel.
• English proficiency at B2 level or higher, with strong written and verbal communication skills.
• Ability to work effectively in a dynamic environment, manage priorities, and meet deadlines.
• Strong communication and stakeholder management skills.
• Proactive mindset, initiative, and a continuous improvement approach.

Ready for the challenge? Send your resume and join the team that shapes the future!

Privacy and personal data policy:
https://www.pwc.com/ua/uk/about/privacy.html

Job Description

5+ years of experience in QA automation, including at least 3 years writing automated tests in Python
Strong hands-on experience with pytest (fixtures, parametrization, plugins, markers) and building automation frameworks from scratch
Solid experience in REST API testing (requests/httpx, schema and contract validation)
Experience testing distributed, event-driven backend systems (message queues, async processing, eventual consistency)
Practical knowledge of AWS services such as S3, SQS/SNS, EventBridge, Lambda, DynamoDB and RDS/Aurora, and of testing against them with boto3 and LocalStack or moto
Good SQL skills for data validation (PostgreSQL/Aurora)
Experience integrating test suites into CI/CD pipelines, preferably Azure DevOps, including reporting (Allure or similar) and quality gates
Working knowledge of Docker and Git
Understanding of test design techniques, test pyramid principles and risk-based testing
Upper-Intermediate English or higher, spoken and written

Nice to have:

Experience in regulated domains such as medical devices, healthcare or pharma (IEC 62304, FDA, GxP, ISO 13485), including requirements traceability and validation documentation
Experience testing IoT or connected-device platforms (device provisioning, certificates, TLS/mTLS, OTA updates)
Experience testing data and log-processing pipelines (file parsing, CSV/data validation, large datasets)
Exposure to testing LLM-based or agentic AI applications (LangChain/LangGraph, AWS Bedrock, evaluation of model outputs)
Performance or load testing (Locust, k6)
Basic Java reading skills, since the core backend services are written in Java
AWS or ISTQB certification

Job Responsibilities

Design, build and maintain a Python-based test automation framework for a cloud platform that manages connected medical devices
Develop automated API, integration and end-to-end tests covering device management, log processing, content delivery, remote access and security flows
Automate validation of log-parsing pipelines and the data they produce
Build and run tests against AWS services, using LocalStack for local and pipeline environments
Integrate automated suites into Azure DevOps CI/CD pipelines and maintain stable, fast regression and smoke runs
Take ownership of regression and smoke suite execution during and after the platform handover from the previous vendor
Contribute to quality of the new AI analytics layer, including test strategies for natural-language queries and validation of generated results
Report, triage and track defects, and take part in root-cause analysis together with developers
Maintain test documentation and traceability between requirements and tests, in line with regulated SDLC and compliance needs
Work closely with the developers, DevOps and the Business Analyst in an Agile team

Department/Project Description

Our client is a global leader in eye-care medical devices. We are taking full engineering ownership of their Service Cloud: an AWS-based platform that connects thousands of surgical and diagnostic devices worldwide. The platform handles the full device lifecycle, from secure provisioning and certificate-based onboarding to log collection and parsing, software updates, remote support and audit logging.

The project combines three workstreams in one team: Service Cloud engineering and L3/L4 support, log parser development, and cloud and AI modernization. The modernization starts with a conversational analytics layer, where users ask questions in plain language and an AI agent builds queries and dashboards over device and log data.

You’ll join a cross-functional team of architects, Java, C++, AI/ML and DevOps engineers. You’ll help shape the quality approach for a live, regulated medical-device platform at a point where the team is taking it over and setting its standards.

Our client, an iGaming game development company, is looking for an experienced Back-End Team Lead to lead backend development and contribute to the development of gaming products.

Requirements

• Proven experience in the iGaming or GameDev industry, preferably iGaming.
• Strong experience with Node.js.
• Solid knowledge of MongoDB and PostgreSQL.
• Experience designing and developing scalable backend systems.
• Previous experience leading a backend development team.

• Strong technical leadership and problem-solving skills.

   

Responsibilities

• Lead and coordinate the back-end development team.
• Design and maintain backend architecture.
• Ensure code quality, performance, scalability, and reliability.
• Collaborate with other teams to deliver gaming product features.

• Make technical decisions and improve development processes.

   

About the project
B2B SaaS platform combining LinkedIn Ads optimization, website visitor identification, and revenue attribution in one decision layer. 

Why this role exists

A hybrid role to free up the CTO from coordination overhead and build automated QA from scratch, powered by AI tooling.

What you'll do:

PM (primary):
— Turn requirements into developer-ready tasks/epics in ClickUp
— Run sprint planning & retrospectives, keep the team unblocked
— Own documentation and requirement breakdowns

QA (secondary):
— Build automated testing from scratch: E2E, regression, API
— Triage bugs by root cause (frontend/backend)
— Write test plans, build real regression coverage

Requirements
— 3–5 years total: (1.5+ yrs PM/product management, 1.5+ yrs QA)
— Experience with sprint planning/retrospectives
— Strong self-management across PM and QA
— QA background shifting toward automation 
— Working SQL (Postgres/Clickhouse a plus)
— Actively using AI tools in your own workflow
— English B1+

Nice to have:
— B2B SaaS experience
— Martech background (attribution, ad tech, CRM)
— English C1

We offer:
— Investment in your growth
— A flexible process you can shape
— Direct access to decision-makers
— Freedom to choose your own QA stack
— 24 days PTO
— Flexible schedule 

If this sounds interesting, feel free to join!

About the Role

We’re looking for a hands-on engineer to take ownership of incoming drones from OEM partners — confirm they’re fit to fly, resolve or escalate issues, and hand them over to pilots in a ready and reliable state.

This role sits between OEM supply, engineering, testing and pilot operations. You’ll be the person who makes sure aircraft arriving into Occam aren’t just present, but actually usable. When it’s done well, pilots don’t lose time on issues that should have been caught earlier, engineering gets clear feedback on recurring defects, and OEM quality improves.

This is a hands-on engineering role in a fast-moving defence-tech environment. It takes strong technical judgement, attention to detail, practical problem-solving and the confidence to say when something isn’t ready.

What you’ll own

Incoming drone acceptance

• Run structured acceptance checks on UAS platforms arriving from OEMs
• Inspect airframes, wiring, connectors, batteries, payload interfaces and control systems for defects, missing parts or poor build quality
• Confirm each aircraft matches the required build standard, configuration and documentation
• Record acceptance status clearly before it moves to the next stage

Integration and configuration

• Prepare drones for use with Occam’s systems, software and procedures
• Carry out configuration, calibration and setup before test or handover
• Apply approved software, firmware and configuration updates with engineering
• Keep every change recorded and traceable

Flight readiness and functional testing

• Run pre-flight functional checks to confirm the aircraft can fly safely and reliably
• Support ground testing, systems checks and controlled test activities
• Work with pilots and test teams to confirm readiness before handover
• Maintain a clear pass / fail / hold status for each drone

Defect management and OEM feedback

• Log quality issues found during inspection, integration, testing or handover
• Capture defects clearly — photos, notes, serial numbers, evidence
• Keep the OEM quality tracker updated so recurring problems get spotted and escalated
• Work with engineering and supplier teams on root causes, and track fixes to closure

Handover to pilots

• Hand drones over in a clear, consistent, ready-to-use state
• Confirm the pilot has the correct aircraft, equipment, documentation and known-status info
• Brief pilots on relevant configuration notes, limitations or recent fixes
• Record every handover — who took the aircraft and when

Process and workspace discipline

• Keep accurate records of status, defects, fixes, test outcomes and handovers
• Keep the Kanban / tracking board current and drones stored by status
• Maintain labelling, tagging and inventory control
• Help improve the acceptance process as volumes grow

Required experience

• Hands-on experience with drones, UAVs, UAS platforms, robotics, electronics or aviation systems
• Strong practical skills: inspection, troubleshooting, configuration and repair
• Experience with structured checks, acceptance testing or quality control
• Good grasp of flight readiness, equipment safety and technical handover
• Ability to diagnose issues across hardware, software, configuration and build quality
• Strong attention to detail and accurate record-keeping
• Comfortable working with pilots, engineers, operations teams and suppliers
• Able to work in a fast-moving, sensitive, high-pressure environment
• Based in and eligible to work in Ukraine; able to travel within Ukraine when required

Desirable experience

• Military drones, FPV systems, fixed-wing or autonomous aerial platforms
• OEMs, supplier quality processes or incoming-goods inspection
• Flight testing, field trials or operational deployments
• Airframes, batteries, radio systems, ground control and onboard electronics
• Configuration management, serial tracking and defect reporting
• Defence, aerospace, robotics or mission-critical hardware
• Ukrainian language skills and strong English

Clearance and location

• Must be based in and eligible to work in Ukraine, and able to travel within the country
• Comfortable in a highly confidential defence-tech environment
• Eligible to obtain and maintain relevant security clearance where required (existing defence/government/military clearance is a plus)

We are looking for a Talent Acquisition Partner with fluent English to join our team.
 

First of all, we are looking for someone with a strong sense of ownership and passion for their work. Someone who takes responsibility, cares about the result, and does not wait to be told what to do.

You take action quickly and don’t postpone things until the next day waiting for the perfect moment. 

You will work closely with a dedicated Sourcer, who will handle the sourcing for your vacancies. This means you can spend less time on repetitive sourcing tasks and focus more on candidates, interviews, client communication, and recruitment strategy.
 

The main part of this role is communication. You will speak with candidates, conduct interviews, and work directly with international clients. You will also lead clarification calls to understand what kind of candidates the client needs.
 

Responsibilities

• Conduct interviews and screening calls with candidates.
• Communicate with candidates during the recruitment process.
• Write messages, follow up, and coordinate interviews.
• Communicate directly with international clients.
• Lead clarification calls for new vacancies.
• Ask clients about the role, requirements, team, and ideal candidate.
• Turn client requirements into clear search criteria.
• Present candidates to clients and provide recruitment updates.
• Build good relationships with candidates and clients.
• Take ownership of your vacancies and recruitment processes.
   

Requirements

• At least 2 years of recruitment experience.
• Fluent spoken and written English.
• Strong sense of ownership and responsibility.
• Passion for recruitment and working with people.
• Confidence in speaking with international clients.
• Experience conducting candidate interviews.
• Good communication and organisational skills.
• Ability to manage several vacancies in a rapid manner.
• Proactive and independent working style.
   

Nice to Have

• German language skills.
• Experience in IT recruitment.
• Experience working with international clients.

• Experience in a recruitment agency.

   

What We Offer

• Full-time remote work.
• Direct work with international clients.
• Independent and responsible role.
• Professional growth in recruitment and client communication.
• Supportive international team.
   

If you enjoy working with people, take ownership of your work, and feel confident communicating with both candidates and clients, we would be happy to hear from you.

Essential experience

• Deep, hands-on AWS networking: VPC and subnet design, routing, security groups
• Delivering network re-architecture on live production platforms with zero downtime
• Controlling egress for serverless and container workloads
• Securing data stores at the network layer

Technologies and tools

• Networking: Amazon VPC, subnets, route tables, NAT gateways, Internet gateways, Transit Gateway (if in use)
• Network security: Security groups, network ACLs, AWS Network Firewall, Route 53 Resolver DNS Firewall
• Private connectivity: VPC endpoints (gateway and interface / PrivateLink)
• Data stores: Amazon OpenSearch Service (VPC domains, access policies)
• Workloads: AWS Lambda (VPC-attached), Amazon ECS (awsvpc networking)
• Observability: VPC Flow Logs, Reachability Analyzer, CloudWatch
• Infrastructure as code: AWS CloudFormation and/or AWS CDK, or Terraform

Desirable

• Amazon OpenSearch Service security configuration
• AWS Network Firewall or equivalent egress filtering
• AWS certification (e.g. Advanced Networking – Specialty)

Job Responsibilities

• Restrict network access to internal Amazon OpenSearch domains using VPC placement, security groups and access policies
• Redesign VPC and subnet layout so Lambda and ECS workloads route through controlled egress points
• Implement egress controls such as NAT gateways, AWS Network Firewall, VPC endpoints (PrivateLink) and route table changes, per the agreed design
• Tighten security groups and network ACLs to least privilege
• Plan and execute zero-downtime migrations: staged cutovers, traffic validation, tested rollback
• Use VPC Flow Logs and Reachability Analyzer to baseline traffic before change and verify it after
• Deliver all network changes as infrastructure as code with peer review
• Produce network diagrams and runbooks for the platform team

Department/Project Description

The Client is one of the majour insurance companies in the UK.
This role supports a high-priority risk reduction programme for the Green Flag MyCro Platform, a complex technology estate built on AWS. Platform SMEs have already designed remediation plans and started putting them into effect. The DevOps engineer we're looking for will lock down subnet-level access to internal OpenSearch indexes and reconfigure the platform's VPC and subnet design so egress from hosted Lambda functions and ECS clusters can be controlled. These are complex, platform-wide network changes that must be delivered with zero downtime. You will join a new squad led by a Platform SME.

Remote | Full-time | Long-term | Up to $28/hour

About the Project

We are looking for a highly experienced Senior Backend Engineer with deep expertise in payment processing to help build and scale a payment orchestration platform integrating multiple payment providers.

This role requires more than strong backend development skills. We need a hands-on engineer who understands the complexities of real-world payment systems, including card processing, money movement, transaction lifecycles, reconciliation, and payment security.

The ideal candidate can independently design reliable payment solutions, navigate complex financial workflows, and troubleshoot critical production issues.

Responsibilities

• Design, develop, and optimize scalable backend services for a payment orchestration platform.
• Build and maintain integrations with payment gateways, processors, and third-party payment APIs.
• Implement and support end-to-end payment flows, including authorization, capture, refunds, settlements, disputes, and chargebacks.
• Develop reliable payment processing workflows with appropriate handling of failed transactions, retries, and edge cases.
• Work with ACH/NACHA payment flows and related integrations.
• Design and improve ledger, reconciliation, transfers, fund holds, and money movement functionality.
• Ensure payment solutions follow PCI DSS and relevant payment security requirements.
• Investigate and resolve complex production issues involving payment transactions and provider integrations.
• Contribute to backend architecture, API design, performance, and scalability.
• Collaborate with an international engineering team and independently own technical solutions.

Requirements

• Extensive commercial backend engineering experience at a Senior level.
• Deep hands-on production experience with card payments and payment processing — essential.
• Strong backend development skills with Node.js / TypeScript (NestJS) and/or Go.
• Thorough understanding of the complete payment lifecycle:
  • Checkout and payment initiation
  • Authorization and capture
  • Refunds and settlements
  • Disputes and chargebacks
• Practical experience with ACH / NACHA.
• Strong understanding of PCI DSS and payment security requirements.
• Experience with payment gateways, processors, and third-party payment APIs.
• Knowledge of ledger systems, reconciliation, money movement, transfers, and fund holds.
• Ability to handle payment failures, retries, transaction states, and complex edge cases.
• Experience with PostgreSQL, REST APIs, and microservices architecture.
• Ability to independently design payment solutions and resolve complex production incidents.
• Strong analytical and problem-solving skills.
• English B2 or higher, with confident technical communication.

Nice to Have

• Hands-on Go development experience.
• AWS cloud infrastructure.
• Event Sourcing and Event-Driven Architecture.
• Experience building multi-provider payment orchestration solutions.
• BNPL (Buy Now, Pay Later) integrations.
• Experience with high-volume transaction processing systems.

Working Conditions

• Engagement: Full-time
• Duration: Long-term
• Location: Remote, excluding Russia and Ukraine
• Rate: Up to $28/hour
• Time Zone: Minimum 5 hours of overlap with US Central Time business hours (9 AM–5 PM CT)
• Start: ASAP

Who We Are Looking For

We are looking for an engineer who has worked directly with production payment systems and understands how money actually moves through payment infrastructure.

You should be comfortable discussing authorization and settlement flows, payment failures, reconciliation discrepancies, chargebacks, provider integrations, and payment security.

Payments domain expertise is the primary selection criterion. Strong backend skills are essential, but experience building and operating real payment processing solutions is what will make you successful in this role.

If you have deep payment processing experience and enjoy solving complex backend challenges, we'd love to hear from you.

Project Description:

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

Responsibilities:

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

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

Mandatory Skills Description:

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

Nice-to-Have Skills Description:

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

Languages:

English: B2 Upper Intermediate

Required Skills:
- Strong proficiency in Java 8+, with solid hands-on experience in Spring Boot and Spring MVC.
- Experience in RESTful API design and development.
- Familiarity with SQL/NoSQL databases.
- Hands-on experience with Git, Maven/Gradle, and CI/CD pipelines.
- Experience working with API documentation tools like Swagger/OpenAPI.
- Knowledge of .NET.

Preferred Skills:
- Experience with Azure DevOps (ADO) or GitHub Actions.

Soft Skills:
- Strong analytical and problem-solving abilities.
- Excellent communication and teamwork skills.
- Ability to work independently and manage migration-specific tasks with minimal guidance.

Job Responsibilities

 Support and enhancement for 11 Java services – Microservice, Spring boot

Department/Project Description

Customer is one of the world's leading healthcare organizations, operating across 170+ countries with a strong focus on diabetes, obesity, and rare disease care. We are in managed service contract for 55+ AEM websites.

Senior C Developer (Legacy Systems / Performance Optimization)

Remote | Full-time | B2B Contract | 

We are looking for an experienced Senior C Developer to join a project focused on optimizing the performance of a legacy data processing system.

The existing platform processes large volumes of data through ETL pipelines and loads the results into a relational database (Db2). As data volumes increase, the system experiences performance degradation.

Your main responsibility will be to identify performance bottlenecks, optimize existing C code, and improve the scalability and efficiency of data processing.

We are also open to experienced C++ developers with strong C knowledge who are comfortable working primarily with C.

Responsibilities

• Analyze and optimize existing C code in a legacy production environment.
• Identify and resolve performance bottlenecks in data processing and ETL workflows.
• Improve application performance and scalability as data volumes increase.
• Work with relational databases and SQL queries.
• Optimize multithreaded and parallel processing using Intel OpenMP and related technologies.
• Investigate CPU, memory, and database performance issues.
• Maintain and improve existing system components while ensuring stability.
• Use AI-assisted development tools, including Claude, in daily engineering workflows.
• Collaborate with an international engineering team.

Requirements

• Strong commercial experience with C programming.
• Solid knowledge of C++, with readiness to work primarily in C, is also acceptable.
• Experience with performance optimization, profiling, and debugging.
• Hands-on experience maintaining or modernizing legacy systems.
• Good understanding of multithreading, concurrency, and parallel programming.
• Experience with Intel OpenMP or comparable parallel programming technologies.
• Strong SQL skills and experience with relational databases.
• Understanding of memory management and low-level application performance.
• Experience using AI coding assistants or AI-assisted development workflows.
• English B2+/C1 — confident technical communication.

Nice to Have

• Experience with IBM Db2.
• Knowledge of Embedded SQL / SQL embedded in C.
• Experience optimizing ETL or large-scale data processing systems.
• Experience with high-volume batch processing.
• Experience with performance-sensitive enterprise applications.

Project Details

• Engagement: Full-time
• Duration: Several months
• Location: Remote, excluding Russia and Belarus
• Rate: Up to $18/hour
• Start: To be discussed

Why Join?

• Work on challenging performance engineering problems.
• Optimize a production system processing growing volumes of data.
• Apply your expertise in C, concurrency, SQL, and low-level optimization.
• Work in an engineering environment using modern AI development tools.

Interested? Apply with your CV