Full Stack Engineer

Geniusee

format:Remotecompany:Outsource

typescriptnode.jsnestjsreactnext.jspostgresqljestvitestgitci/cd

redisplaywrighttailwind csstanstack querybullmqaws

englishB2

experience3+ years

domainEcommerce

locationKyiv, Ukraine · Lviv, Ukraine +1

> full description

At Geniusee, we help businesses thrive through technology partnerships and strengthen the engineering community by sharing knowledge and creating opportunities 🙌
We live by our values: Continuous Growth, Team Synergy, Taking Responsibility, Conscious Openness, and Result-Driven Mindset. Here, you’ll find a safe, inclusive, and supportive environment where your voice is heard, and feedback is welcome 🤗
Whether you want to work from home or from our offices in Kyiv / Lviv / Warsaw with stable electricity and Wi-Fi, we’ve got you covered.
Join us and make an impact 💜

Description

We’re looking for a Senior Full-Stack Engineer to own vertical delivery across backend and frontend—from API and data sync to storefront and admin UI—on a demanding B2C e-commerce product with tight timelines.

This role is ideal for someone who is strong in TypeScript end-to-end (Node.js backend + React/Next.js), comfortable with integrations (ERP/commerce sync, payments, shipping), and uses AI-assisted development in a disciplined, spec-driven way—not ad-hoc vibe coding.

You’ll work in a small team (lean delivery), collaborating closely with Solution Architects, BA, and designers. You’ll take features from approved specs / acceptance criteria to production: catalog and filters, cart/checkout, auth, admin tooling, and background sync jobs. You’ll contribute to engineering standards, code review, estimation, and pragmatic MVP trade-offs under time pressure.

Requirements

● 3-5 years of commercial experience in full-stack or backend-heavy web development (with solid frontend delivery);
● Strong TypeScript — production-grade typing on both API and UI layers; refactoring and code review;
● Backend: Node.js with NestJS (or equivalent modular framework)—REST APIs, auth/session, validation, layered architecture, background/async jobs;
● Frontend: React + TypeScript; production experience with Next.js (App Router, SSR/SSG) or willingness to ramp quickly on Next for SEO-critical storefront pages;
● Data: PostgreSQL in production (schema design, migrations, query performance); familiarity with Redis (cache / queues) is a plus;
● Experience integrating third-party systems via APIs, webhooks, or scheduled pull/export (ERP, payments, shipping, email)—idempotency and failure handling mindset;
● Familiar with unit and integration testing (Jest / Vitest; API and UI tests; Playwright or similar is a plus);
● Experience with Git and branching workflows (feature branches, PR review, CI gates);
● AI Toolset (required): daily use of AI coding assistants (Cursor, Claude Code, GitHub Copilot, or equivalent) for implementation, refactoring, and documentation—with human review, quality gates, and clear boundaries on payments, auth, and money/stock paths;
● Spec-Driven Development (required): experience with—or strong readiness to work in—spec-first workflows using GitHub Spec Kit (or equivalent: spec → plan → tasks → implement); ability to implement from written specifications and acceptance criteria, not from prompts alone;
● Ownership mindset: vertical slice delivery (API + UI + data + tests); early technical risk identification; constructive communication with SA, BA, and PM; comfort with MVP scope cuts and explicit deferrals;
● English — Upper Intermediate (B2) or higher for async and sync collaboration.

Responsibilities

● Deliver full vertical slices: backend services/APIs, data model, storefront or admin UI, and tests aligned to acceptance criteria;
● Implement and evolve catalog, checkout, auth, admin, and integration features based on requirements and architectural design;
● Design and maintain sync/integration jobs (e.g. stock/price/catalog pull; outbound orders) with clear ownership of source-of-truth boundaries;
● Build and maintain Next.js / React surfaces with attention to performance, accessibility, and SEO where required;
● Implement new features, evolve existing ones, and fix bugs with quality, performant, testable code;
● Use AI tools and Spec Kit / SDD under team constitution and architecture guidelines defined by Solution Architecture;
● Conduct code reviews across FE and BE; raise technical risks early (especially payments, stock, and cutover);
● Collaborate with SA on API contracts, ADRs, and MVP vs Phase-2 boundaries;
● Participate in estimation and planning; help keep delivery realistic on a small team and short timeline;
● Provide a positive, polite, and open-minded style of communication.

Nice to have

● E-commerce domain — catalog (PLP/PDP), product tags/filters, cart and checkout, promotions/promo codes, customer account;
● 1C / ERP or other inventory & pricing sync experience (file exchange, exchange nodes, stock/price pull jobs);
● Payment / shipping integrations (local gateways e.g. Mono, Nova Poshta, webhooks, COD flows);
● SEO-oriented storefront work: canonical/hreflang, sitemaps, robots, Core Web Vitals;
● UI stack: Tailwind CSS, shadcn/ui / MUI, form/schema validation;
● TanStack Query, Zustand/Redux or equivalent on the client;
● Message queues / workers (BullMQ, SQS, or similar) for sync and notifications;
● CI/CD — GitHub Actions / GitLab CI; Docker basics; AWS (Lambda/ECS, S3, CloudFront) familiarity;
● Admin / internal tools (CRUD, role-based access);
● Mentoring, technical interviews, estimation and planning sessions.

Nice to have

● Experience working on multiple projects simultaneously
● Exposure to pre-sales or discovery activities
● Experience working with distributed or international teams
● Understanding of budgeting or resource planning basics
● Experience delivering projects with fixed scope or fixed-price models
● Technical background or previous experience in development, QA, or business analysis

What will you get:
Career growth & projects
● Competitive salary based on your skills and experience, and a benefits package.
● Regular performance appraisals to support your career development.
● Professional development support: online courses, certifications, and study compensation (including English courses).
● A modern tech stack across challenging, long-term projects.

Health & well-being
● Paid vacation (18 working days) and sick leave (15 days).
● VIP medical insurance or sports coverage.

Work environment & flexibility
● Remote work from anywhere in the world or in one of our offices in Kyiv, Lviv, or Warsaw.
● Coworking compensation.
● Necessary equipment to perform your work.

Culture & community
● A collaborative and open culture where contributions are recognized.
● Regular corporate online & offline activities.
● Geniusee Charity Fund, making a difference beyond tech.