Jobs Backend

Backend Engineer (Node.js / TypeScript) — AI-First SaaS

Company: ListKit (US-based, remote-friendly) Compensation:  (based on experience) Type: Full-time contractor, remote Location: Ukraine / EU

About Us

ListKit is a fast-growing B2B lead generation platform processing 825M+ data records. We're an AI-first engineering team — Claude and Cursor are embedded in everything from code review to sprint planning. If you've never shipped code with AI tools, this isn't the right fit. If AI-assisted development is already how you work, keep reading.

What You'll Do

• Design and build backend services in Node.js and TypeScript powering data enrichment, order processing, and API infrastructure
• Own async processing pipelines: message queues, job lifecycle management, retry logic, completion detection
• Work with cloud services (GCP Cloud Run, PubSub, Cloud Tasks, Firestore) to build scalable, event-driven systems
• Optimize SQL queries against large-scale databases (SingleStore, SQL Server, PostgreSQL) with 100M+ row tables
• Integrate third-party APIs with rate limiting, provider fallback patterns, and error recovery
• Build and maintain REST APIs serving both internal frontend teams and external customers
• Use AI development tools (Claude Code, Cursor, GitHub Copilot) as your primary workflow — not as an afterthought
• Participate in code reviews, architectural discussions, and sprint planning

Requirements

• 4+ years of backend development experience with Node.js and TypeScript
• Strong understanding of async patterns: Promises, event loops, streaming, worker threads
• Experience with message queues and async job processing (PubSub, SQS, Kafka, or similar)
• Solid SQL skills — complex JOINs, query optimization, stored procedures
• Experience with cloud platforms (GCP preferred; AWS/Azure transferable)
• Familiarity with containerized deployments (Docker, Cloud Run, or similar)
• Active user of AI coding tools (Claude, Cursor, Copilot) in daily development
• Strong written English for async communication (Slack, Linear, docs)

Nice-to-Have

• Experience with GCP specifically (Cloud Run, PubSub, Cloud Tasks, Firestore)
• Familiarity with Terraform or other IaC tools
• Experience with data enrichment, lead generation, or sales automation platforms
• Stripe billing integration (credits, refunds, usage-based pricing)
• Exposure to .NET/C# (reading code, understanding integration points)
• Experience building multi-tenant SaaS APIs with API key auth and per-plan rate limiting
• React/Next.js frontend skills (we have a frontend team, but versatility is valued)

Why ListKit

• AI-first team: we estimate all work assuming AI-assisted development and track AI adoption scores
• Small, high-output engineering team where your work directly impacts revenue
• Real distributed systems problems at meaningful scale (not CRUD)
• US-based company with EU-friendly hours and async-first culture
• Fast-moving — we ship weekly, not quarterly

We are looking for a skilled and driven Senior Full Stack Software Engineer to join our growing team. 

In this role, you’ll join a team of engineers ranging from junior to senior, a group of experienced hands-on engineering managers, and a range of other team members all focused on one thing - providing a world-class educational experience to students from all walks of life.

 Responsibilities:

• Design, develop, and maintain scalable and reliable web applications using C# and Vue.js
• Collaborate with product and engineering managers, stakeholders, and other teams to scope, prioritize, and deliver value adding features to our consumers
• Write clean and testable code
• Lead and mentor more junior developers in code quality, clean architecture, and best practices

You may be a good fit if you have (requirements):

• 6+ years of professional software development experience
• Proficient (2+ years experience) in each of the following, with senior-level expertise in at least one:
  • Modern C#/.NET
  • Vue.js (or similar reactive frameworks, e.g. React, Angular)
  • CSS and modern front-end styling practices
  • Database technologies
• Experience leading complex engineering initiative design and execution
• Strong clean coding experience (maintainability, flexibility, extensibility, reliability)
• Strong communication skills and experience giving and receiving code reviews
• Experience with version control systems
• Experience mentoring other developers, formally or informally

What Makes You Stand Out (nice-to-haves)

• University degree in Software Engineering or related field
• Experience with GCP, GKE, GCS (or similar cloud technologies)
• Experience with PostgreSQL
• Familiarity with DevOps (CI/CD pipelines, K8s, Helm, Argo CD, Terraform)
• Experience with Application Security, SecOps, Cloud Security, or similar
• Experience with migration patterns (strangler-fig, dual-write, CDC, etc)
• Experience with rollout strategies (blue-green, canary, phased)
  
   

Qualities that will make you successful:

• Strong interpersonal and communication skills;
• Ability to work collaboratively in a remote environment;
• Growth mindset and motivated by constructive feedback;
• Proven ability to work independently, manage schedules, and meet deadlines;
• Passion for education and building solutions that support students and educators.

✨Finerd builds next‑generation financial tools. 

We need a Senior Java Engineer who doesn't just write code — you think in systems, care about outcomes, and treat every feature like it's your own product.
 

📌Your mission
• Own the back‑end end‑to‑end: from API contract to production stability.
• Build with product mindset — understand why a feature matters, not just what it does.
• Engineer for scale — event‑driven microservices on Kafka, production‑grade from day one.
• Take full ownership — "not my zone" is not in your vocabulary.
• Balance reliability and velocity — simple and robust beats clever and fragile.
 

🌍Work from anywhere: fully remote, or join us in Barcelona (ES), Kyiv, or Odesa (UA).
 

👀Who we are
Our core team built Ukraine's leading finance app (1.5 M installs, $1 M ARR in the US & Canada). Now we're aiming higher — globally.
 

😇Why Finerd
• Compact, autonomous team — shape your stack, own your results.
• Remote‑first culture — we measure outcomes, not hours.
• No bureaucracy — straight line from idea to production.
 

Desired Skills

🔹Java & Back‑End
• Expert Java 17/21 (4+ years of experience): JVM internals, concurrency, performance tuning.
• Spring Boot, Spring Cloud, Spring Security, API gateway patterns.
• Microservice architecture: resiliency, idempotency, circuit breaker, distributed systems.
• Kafka: delivery semantics, schema evolution, DLQ.
• PostgreSQL schema design and query optimisation; Hibernate / JPA / jOOQ.
• REST API + contract‑first (OpenAPI/Swagger).

✔️Nice to have: Redis, OpenFeign, observability stack (Prometheus / Grafana / NewRelic), JUnit / Testcontainers / WireMock.
 

🔹Infrastructure
• Production AKS + Kubernetes: deployments, incidents, rollbacks, node pool and autoscaling management.
• Terraform (module‑based) and Helm for release management.

✔️Nice to have: KEDA, Strimzi (Kafka on K8s), Azure RBAC / Entra ID, Key Vault secrets rotation.
 

🔹The mindset that matters
• Product‑first: you care about outcomes, not tickets.
• Simple and reliable beats elegant and pattern‑perfect.
• You ship features without a PM holding your hand — and track the metrics after.
• You test your own changes. Always.
• Ownership without borders — if it affects the product, it's your concern.
 

💌Benefits
• 37 business days paid leave (vacation, sick days, public holidays)
• Fast, merit‑based career growth
• 50% reimbursement: English classes, insurance, professional courses
• 100% coworking reimbursement
• Weekly Innovation Bounty
 

🤝Reality check
We're not your typical 9‑to‑5 shop. We're building something meaningful, and that sometimes means pushing boundaries. If you're looking for perfect work‑life balance, we might not be your match. But if you want to build products that matter with people who care as much as you do — let's talk.

About Us

Smirnov Labs is a fast-growing engineering company founded by an ex-Googler. We help product teams launch and scale quickly by leveraging modern technology and AI-assisted development.

Our projects are diverse — we partner with clients at the earliest stages and own the technical delivery end-to-end.

We're a small, senior-heavy team where every engineer has real impact. No bureaucracy, no hand-holding — just sharp people shipping fast.

What You'll Do
 

• Own features end-to-end: from architecture and implementation to deployment and support
• Build and ship web applications using Ruby on Rails
  Design and maintain APIs, services, and data layers (PostgreSQL, Redis, Sidekiq)
• Deploy and operate services on AWS with Docker
• Write clean, well-tested code with RSpec                                         
• Communicate with the CTO and client-side engineering team directly — no layers in between
• Use AI-assisted development tools (Claude, Cursor, GitHub Copilot) as part of your daily workflow
• Work across diverse projects — different domains, different challenges    

What We're Looking For
 

• 4+ years of professional backend or full-stack development experience
• Strong Ruby and Rails skills (Rails 6+)
• Solid hands-on experience building RESTful and/or GraphQL APIs
• Production experience with PostgreSQL, Redis, Sidekiq, AWS, Docker
• Familiarity with frontend basics (HTML, CSS, JavaScript) — enough to work with Hotwire/Turbo or integrate with a JS frontend
• Comfort working in US timezone (overlapping working hours required)
• Upper-Intermediate or higher English
• Ability to own and drive features independently with minimal supervision
• Go or TypeScript experience is a plus

What We Offer

• Competitive salary above market average
• Fully remote work
• Flat structure — work closely with the CTO, no middle management
• Diverse and technically challenging projects
• Modern AI-powered development workflow
• Small team culture — your voice matters, your code ships
• Paid vacation and sick leave
• Flexible schedule within US timezone overlap
• Professional and career growth through real ownership, not courses and certificates
   

How to Apply

Send your CV with a brief note about a project you're most proud of.

About CodePhusion: At CodePhusion, we are dedicated to innovation and excellence in the IT sector. We empower businesses by delivering cutting-edge software solutions. We are currently seeking a dynamic Junior Engineer for full-time collaboration.
 

Job Description: As a Trainee/Junior Engineer, you will be instrumental in implementing robust backend services focused on scalability, maintainability, and security with support and mentorship.
 

Responsibilities:

• Develop and maintain scalable backend services using Python (usually FastAPI)
• Collaborate with front-end developers and UI/UX designers to ensure seamless integration and functionality.
   

Qualifications:

• Bachelor's or Master's degree in Computer Science, Engineering, or a related field.
• Minimum of 0.5 years of experience in backend development with Python, including freelance or IT academy experience.
• Experience working with AI tools, combined with a strong curiosity and eagerness to explore, adopt, and innovate using emerging AI technologies.
• Excellent problem-solving skills and ability to work independently in a fast-paced environment.
• Strong communication skills and ability to collaborate effectively in team settings.
• Ukrainian language is a must.
   

What We Offer:

• Flexible working hours and remote work options.
• Opportunity to join a rapidly growing company and shape its technological direction.

Application Process: We look forward to exploring your potential at CodePhusion here at Djinni! Start your application by mentioning your favourite tool for vibe-coding and briefly explaining why you enjoy using it:)

Requirements

• Strong knowledge of PHP (1+ year of hands-on experience) and Laravel framework (1+ year);
• Basic understanding of front-end technologies: JavaScript, HTML5, CSS3;
• Experience with version control systems such as Git, Bitbucket, or similar;
• Hands-on experience integrating third-party APIs (Google, Facebook, and others);
• High level of self-organization, responsibility, creativity, and professional ethics;

• Strong communication skills and a proactive mindset. 

  Responsibilities

• Develop, maintain, and support company websites and web applications;
• Communicate with clients, clarify requirements, answer questions, and provide effective solutions;
• Participate in all phases of the software development lifecycle;
• Follow best practices in coding, security, and data protection, especially when working with sensitive data (API keys, tokens, etc.);

• Collaborate with the team to improve product quality and performance.

   

  We offer an opportunity to grow professionally, work on interesting projects, and be part of a supportive and dynamic team.

Help Build Technology That Saves Lives

Areti Health is a venture-funded Silicon Valley healthcare technology startup transforming how patients join clinical trials.

Using generative AI, we dramatically accelerate clinical trial enrollment for pharmaceutical, biotech, and medical device companies, helping life-saving therapies reach patients faster.

Our AI platform achieves up to 10x higher patient conversion rates compared to traditional human-driven recruitment. By automating outreach, answering patient questions, scheduling appointments, running pre-qualification questionnaires, and assisting with onboarding, we compress recruitment timelines from months to weeks.

We already work with some of the largest clinical research site networks in the United States and are an official partner of CRIO, one of the leading clinical trial management systems.

If you're excited about building real-world AI systems that impact healthcare, we'd love to talk.

About the Role

We’re looking for a Staff Software Engineer who will act as a technical leader and force multiplier across our engineering team.

This is not just a senior individual contributor role, you’ll help shape how we design systems, build software, and adopt AI-assisted development practices.

You’ll work primarily in Python, building systems that integrate large language models (LLMs) into real healthcare workflows used by clinical research organizations and patients.

Beyond shipping product, you'll help elevate the engineering quality bar, architecture, and development practices across the company.

What You’ll Do

• Design, build, and own core systems in our Python-based platform
• Develop and scale LLM-powered features integrated into healthcare workflows
• Lead technical direction for your domain, balancing speed, simplicity, and long-term maintainability
• Mentor engineers through code reviews, design discussions, and pairing
• Champion engineering best practices including:
  • testing
  • observability
  • documentation
  • CI/CD
    
     
• Pioneer the use of AI-assisted engineering tools across development workflows (coding, testing, documentation, and reviews)
• Collaborate with product, design, and clinical teams to translate complex healthcare requirements into reliable systems
• Identify improvements to engineering processes, tooling, and team workflows
• Contribute to hiring and evaluating engineering candidates

What We’re Looking For

• 8+ years of professional software engineering experience
• Deep proficiency in Python
• Strong system design and architecture skills, with experience building production systems at scale
• A track record of technical leadership through influence, mentoring engineers without formal management authority
• Experience working in remote, distributed engineering teams
• Curiosity and enthusiasm for AI-assisted software development
• Clear communication skills in written and spoken English
• A pragmatic mindset with a bias toward simplicity and shipping

Nice to Have

• Experience in healthcare, health-tech, or clinical research
• Familiarity with HIPAA, SOC 2, or other compliance frameworks
• Hands-on experience with LLMs, prompt engineering, or AI/ML model integrations
• Experience building AI-enabled production systems
  
   

What We Offer

• Competitive salary
• Paid holidays and vacation
• Remote work with a talented, mission-driven team
• The opportunity to work on cutting-edge generative AI applications in healthcare
   

Most importantly, you'll help build technology that accelerates clinical trials and saves lives.

If you're excited about building impactful AI systems and raising the engineering bar in a fast-moving startup, we'd love to meet you.

The US based content management and marketing data analysis platform which allows SEO/SMM agencies and their customers to have full control over content planning, collaborative development and publishing to production. It also provides full visibility of content impact on a web site ranking in a real time via massive data collection, aggregation and reporting.

Dev stack you will use:

• Python 2.7 (migrating to 3) Flask
• SQL Alchemy
• PostgreSQL
• Cloudflare Workers
• GCP, AWS

What you will do:

• Build, maintain and refactor backend services using Python.
• Develop asynchronous workflows for data ETL processes. 
• Improve PostgreSQL DB layer: query optimisation, DB structure, service reliability, and parallel execution
• Design and support REST APIs used by frontend and internal services
• Add monitoring, logging, and basic observability to keep the platform healthy

How to work with us:

• Small product team (5 US-based, 1 in EU)
• Agile workflow and Kanban methodology
• Communication over Slack, Zoom in English
• 2 hours daily overlap with MST time zone (10:00-19:30 CET)

What we expect from you:

• 4-6 years of production experience with Python (backend and data‑intensive systems - data ETL flows)
• Strong PostgreSQL fundamentals, query optimisation, and migration.
• Good experience with SQLAlchemy;
• Experience designing background jobs, async tasks, and fault-tolerant workflows;
• Experience integrating with third-party APIs (REST, webhooks, OAuth, background syncs)
• Strong English & communication skills (B2 or hier) 
• A mindset to solve problems, not tasks and testing skills. 
• Big plus: previous experience with SEO, AdTech, or marketing-related products
• Big plus: previous experience with data ETL and Cloudflare Workers

What we offer (besides a motivating salary):

• Working format: fully remote
• Working hours: 10:30 - 19:30 CET (2 hours overlap with MST daily)
• Assignment: full-time, long-term
• Ability to influence the product roadmap
• No overtime - healthy work-life balance
• No rush - we thoroughly plan our work. 

• Compensation: B2B contract with an hourly rate in USD + PTO of 15 working days/annual

   

Our interview process:

• 20m interview with one of our Talent Team Partner
• 30m interview - Tech Screening with our Engineers
• 1h interview - Tech Deep Dive with customer Engineers 
• 30m offer discussion

We're looking for a Senior Java Engineer with VoIP experience to join a dedicated product team building real-time communication systems for an international client. You'll own backend architecture, work closely with mobile and frontend teams, and ship features that handle voice, video, and signaling at scale.
 

Requirements:

• 5+ years of backend development with Java (Spring / Spring Boot)
• Strong experience with WebRTC protocols and architecture
• VoIP / SIP / RTP / signaling servers
• Experience integrating backend systems with iOS and Android applications
• Real-time data streaming, distributed systems, microservices architecture
• Cloud platforms (AWS / GCP / Azure)
• Kafka, WebSockets, REST APIs
• PostgreSQL / MySQL
• English: B2+ (daily communication with the product team)
   

Nice to have:

• Twilio / Agora / Vonage / similar RTC platforms
• Media servers (Kurento, Janus, FreeSWITCH, Asterisk)
• AI/voice processing, speech analytics
• Background in telecom or communication products
   

What you'll do:

• Design and develop high-performance backend services using Java (Spring Boot)
• Build and maintain real-time communication systems (WebRTC, VoIP, SIP)
• Integrate backend systems with mobile applications (iOS & Android)
• Work with streaming, signaling, and media servers
• Ensure low-latency, high-availability architecture
• Collaborate with cross-functional teams (mobile, frontend, DevOps)
• Optimize system performance, scalability, and reliability
   

We offer:

• Full remote
• Location: Armenia, Poland, Ukraine, Eastern Europe
• Paid vacation and sick leave
• Competitive rate
• Direct communication, no bureaucracy
• Long-term engagement on a dedicated product team

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-trafficked 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:

• Senior level knowledge of Golang;
• 8+ years of production experience in software engineering and SaaS product development;
• Strong communication and listening skills; ability to communicate complex technical problems, root cause analysis, and propose solutions;
• 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 designing and building scalable solutions;
• Experience with modern design patterns such as SOA and microservice architecture;
• Strong knowledge of relational databases (ex. PostgreSQL) and Databricks (a plus);
• Excellent debugging and testing skills, and an interest to quickly learn new technologies;
• Experience with Agile methodology and software development;
• Commitment to following security, accessibility and performance best practices;
• Self-starter with strong sense of collaboration, teamwork, and accountability;
• Ability to quickly adopt to new environment;

• 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 time off 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.

We are looking for a trainee who loves Software Development. We need a self-motivated person who wants to learn a lot and use AI to build solutions that are essential for the company: internal automations, custom software, finance-related tools, operations, front-end, back-end, databases, deployment, infrastructure as code, and DevOps.

You will work closely with an experienced developer who has worked at Cisco and Hulu (now Disney+). One of your goals will be to help offload part of his workload, so he is interested in transferring a lot of knowledge to you.

What to expect from your workTech stack you will work with for sure

• Odoo (an ERP system, basically an operating system for the company)
• Python
• PostgreSQL
• JavaScript

• Terraform

   

AI-related stack

• OpenAI API (OCR, text generation, etc.)
• Claude Code for coding
• coder.com for coding environments

• Cursor, Cursor CLI

   

Domains & areas

• Business-related
  • Corporate Finance
  • Human Resources
  • Marketing & Sales

  • Business Process Automation

     

• Tech-related
  • Cybersecurity
  • Software Architecture

  • Product Development

     

Things you may work with later

• TypeScript
• React
• Node.js
• AWS, Hetzner, DigitalOcean
• Proxmox
• Puppeteer
• Selenium
• GitHub Actions
   

We provide:

• Custom Software Development Services
• UX/UI Design Services
• Recruitment Services
• Outstaffing Services

We believe in people, because that is the core of any company: clients and employees.

We value people who are smart and love what they do. That is the kind of team we already have.
 

Requirements for the candidateMust have

• Experience with Python (commercial or non-commercial)
• Bachelor’s degree in Computer Science or a similar field, or currently enrolled in such a program
• Love for Software Development

• High motivation to work and learn

   

Will be a plus

• Experience with Corporate Finance (Financial Accounting, Management Accounting, Accounting Reports, etc.) — this can be a huge plus
• Experience with web software development

• Experience with OOP languages such as C#, C++, or Java

   

Not required

• Commercial experience
• Perfect English

• Knowledge of every tool in our stack

   

We care more about your learning ability and motivation.
We encourage candidates to apply even if they do not match 100% of the list.

Project: 
Warehouse & Inventory Management System (Amazon FBA integration)

We are building a warehouse management system that integrates with Amazon SP-API to manage inventory, inbound shipments, and logistics workflows for sellers.

The system processes:

• Inventory synchronization
• Shipment lifecycle management
• Amazon inbound planning workflows

Responsibilities

• Integrate with Amazon SP-API (inventory, catalog, shipments)
• Implement backend logic for shipment workflows and inventory updates
• Build and maintain asynchronous processing using Celery
• Design and maintain REST APIs (Django REST Framework)
• Handle complex multi-step API flows (preview → confirmation patterns)
• Ensure data consistency between internal system and Amazon
• Implement retry logic, error handling, and rate limiting
• Work with PostgreSQL data models for inventory and shipments

Requirements

Must have:

• 3+ years of Python experience
• Strong experience with Django / DRF
• Experience integrating third-party APIs
• Experience with Celery or similar async tools
• Understanding of REST API design and authentication
• Experience with PostgreSQL

Nice to have:

• Experience with Amazon SP-API
• Experience in e-commerce or logistics systems
• Experience with Kubernetes / AWS

Tech Stack

• Python, Django, DRF
• PostgreSQL, Redis
• Celery
• AWS (S3, Secrets Manager)
• Kubernetes (EKS)

Two backend-focused Ruby developers (1x Senior, 1x Mid)

Location: any

Start: ASAP

Duration: long-term (with potential extension)

Engagement: Full-time

English: B2+

We are looking for two backend-focused developers (1x Senior, 1x Mid) to join a 4-5 month project ASAP (with high potential for long-term extension).

The mission:

Extending the existing API to support self-service features for a new recruitment/hr application.

Requirements:

- Strong Ruby on Rails expertise: Deep experience in scaling and expanding API endpoints.

- React Native (Bonus): Skills in RN are a huge plus and will allow for more flexible task distribution.

- Availability: Ready to start immediately.

Recruitment Process:

1) Introductory Call (15 min): A quick chat to put a face to the name and discuss the role.

2) Case Study: A technical task with specific requirements. 
Note: This takes approximately 8 hours and must be completed within a 9 AM – 5 PM window.

3) Technical Interview: A deep dive into the case study.

4) Culture Fit Interview: A final conversation with the company's CEO

Hello.

We are looking for a Senior Node.js Developer to join Ohayu (https://ohayu.com). We are building the easiest way for travelers to stay online anywhere in the world. We’re a fast-scaling B2C mobile + web app (iOS/Android/Web) that lets people buy eSIM data plans in minutes - cheaper than roaming, no SIM shops, no hassle. Thousands of travelers already use Ohayu worldwide, and we’re just getting started.
Our ambition is bigger than eSIM: we’re evolving Ohayu into a full Travel App that makes every journey smoother.

What you’ll do:

This role is for someone who wants real ownership and real product impact.

• Own integrations with third-party APIs (telco/eSIM providers, payments, analytics, etc.) - abstraction layers, reliability, observability, edge cases, scale.
• Shape backend direction: architecture decisions, technical standards, and how we build/ship safely at speed.
• Enable rapid experimentation: implement backend changes for A/B tests and product iterations that directly impact conversion and retention.
• Build and maintain production-grade services: migrations, logging, alerts, uptime, and smooth releases.

What we’re looking for:

• 5+ years of backend with OOP experience
• 5+ years with Node.js + TypeScript
• 2+ years with NestJS
• 5+ years with MySQL / MariaDB / PostgreSQL
• Hands-on production experience: migrations, monitoring/logging, alerts, process managers (pm2/supervisor), incident mindset
• You work independently, communicate clearly, and take responsibility end-to-end
• At least intermediate English level (all work communication is in English)

Nice to have:

• Experience with high-load systems
• Experience supporting A/B testing and experimentation platforms/pipelines

Why to join us:

• Direct product impact: what you ship gets used immediately by real travelers.
• Ownership: you’re not “a contributor,” you’re a builder helping set the backend direction.
• Product engineering culture: we care about UX and conversion as much as we care about clean code.
• Fast pace, real learning: constant iterations, clear feedback loops, real-world constraints.
• Genesis ecosystem: access to strong expertise, resources, and networking.
• Benefits: health insurance, 20 paid vacation days, annual performance review with clear salary progression.

Work format: Possibility to work fully remotely or from our offices in Warsaw, Kyiv or Lviv.

Join us in reshaping the future of connectivity.

EXPERIENCE AND SKILLS REQUIRED:
4+ years of commercial software development experience;
Strong experience with backend development with Elixir;
Hands-on experience with Phoenix framework and Ecto (or similar backend frameworks/ORMs);
Experience with TypeScript/JavaScript (preferably React);
Experience working with distributed systems and microservices-based architectures;
Solid understanding of concurrent systems and fault-tolerant design (OTP is a strong plus);
Experience working with GraphQL APIs (design and consumption);
Experience with API integrations and client-side data management (e.g., Apollo Client);
Solid knowledge of Git and command-line tools;
Experience with CI/CD pipelines (preferably GitHub Actions);
Strong debugging and problem-solving skills across back-end and front-end;
Ability to work with complex systems (multi-service / umbrella architecture);
Strong analytical thinking and ability to understand the big picture;
Good communication skills and ability to collaborate in a full-stack team;
Ability to work independently, handle multiple tasks, and meet deadlines.