Back End Developer

ExistLive is a zero-fee ticketing, RSVP, and fundraising platform built for nonprofits, artists, and event organizers.Unlike high-fee incumbents, we enable communities to keep 100% of their revenue while streamlining operations with our all-in-one solution.Our platform combines ticketing, fundraising, CRM, and marketing automation, all powered by generative AI. With scalable tiers, fromStartertoEnterprise,ExistLive grows with its users, from grassroots events to large-scale organizations.Trusted by enterprise clients, we're on a mission to make events and fundraising fair, accessible, and growth-driven.Role OverviewWe're looking for aBack-End Engineerto design, develop, and maintain our web applications and infrastructure. You'll work closely with our front-end and product teams to deliver clean, reliable, and scalable systems that power real-world events and fundraising campaigns.Format:Remote, full-timeTimezone:EEST (Kyiv) with at least 4 hours overlapStart:ASAPResponsibilitiesBuild clean and fast Go services on Cloud Run (stateless, timeouts, concurrency, graceful shutdown).Develop and refine Stripe payment flows (Checkout / Connect / SetupIntents, webhooks, idempotency, retries).Implement ticketing logic (reservations, row-level locks, compensations on failure).Design and evolve REST APIs (OpenAPI-first), ensure backward compatibility and proper error handling.Work with PostgreSQL: schemas, migrations, indexes, EXPLAIN/ANALYZE, and query optimization.Integrate with Elastic proxy for event/ticket indexing and rebuild pipelines.Add observability (Datadog metrics/logs/traces) and define alerting standards.Write meaningful unit/integration tests and participate in constructive code reviews.Qualifications2+ years of production Go experience (context, goroutines, sync, http, pgx/driver).Strong SQL/PostgreSQL background (transactions, EXPLAIN, deadlocks, row-level locking).Understanding of Stripe/webhooks/idempotency — or willingness to learn quickly.Basic GCP/Docker experience (Cloud Run, environments, secrets).Strong API design mindset with Clean Architecture principles (SOLID, KISS, DRY, YAGNI).Self-driven, reliable, and ready to take ownership of full feature chunks — not micro-tasks.Preferred SkillsFirebase Auth, external login providers.Datadog APM (tracing, log correlation).Elasticsearch integration, indexing pipelines.OpenAPI-first, client/server generation; compile-time DI (Wire/alternatives).Intermediate+ English for documentation and team communication.Tech StackLanguage:Go 1.25+HTTP:Chi router + custom middlewareDatabase:PostgreSQL + PostGISORM:GORMSearch:Elasticsearch (via proxy service)Payments:Stripe (Checkout / Connect / SetupIntents)Auth:Firebase Auth (+ custom tokens)gRPC:partial, expandingContainerization:DockerCI/CD:GitHub ActionsInfrastructure:GCP (Cloud Run, App Engine, Cloud Storage)Observability:DatadogCode Quality:golangci-lint, testify testsWho we're looking for2+ years of production Go experience (context, goroutines, sync, http, pgx/driver; profiling is a plus).Strong SQL/PostgreSQL: transactions, indexes, EXPLAIN, deadlocks, row‑level locking.Understanding of Stripe/webhooks/idempotency — or willingness to learn fast.Basic GCP/Docker experience: build an image, deploy to Cloud Run, configure environment variables/secrets.API design skills and commitment to simplicity (KISS, Clean Architecture).Self‑driven, go-getter mindset, and ready to take chunks of work, not micro‑tasks.How We WorkGitHub Flow: small PRs, meaningful commits.Linters via golangci-lint, formatting with gofmt/goimports.Mandatory idempotent handlers for webhooks and retries with backoff.Non-functional priorities: reliability > performance , with performance budgets for hot paths.What We OfferVisible impact: your code powers real-world events and fundraising.Influence on architecture and technical debt priorities.Transparent code reviews and respectful collaboration.Paid 2-week trial period, followed by clear decision from both sides.10 paid vacation days per year (after 1 year, flexible usage).Don't meet every single requirement?No problem. If you're excited about what we're building, we'd love to hear from you.Preference given to Ukrainian-speaking candidates residing in Ukraine.