Lead Backend Engineer (Java)| FlintN
- We are currently looking for a Lead Backend Engineer (Java) to join the FlintN — a team, which is building and scaling an all-in-one payment platform for online businesses.
- Next comes a strong growth focus: product development, testing, and integrations aimed at building a global payment platform.
Remote Full-Time | Engineer
Apply
job description
What you’ll be focusing on:
- Own the technical direction of one or more backend domains (payments, routing/cascading, subscriptions, chargebacks) — architecture, roadmap and technical debt strategy.
- Lead a team of backend engineers: task decomposition and planning, code review, mentoring, 1:1 technical guidance, onboarding of new hires.
- Design and drive delivery of distributed, high-throughput, fault-tolerant services and their APIs for internal teams and external integrations.
- Own service quality in production: SLOs, observability coverage, alerting, on-call rotation, incident response and postmortems.
- Own the release process for your domain — safe migrations, rollback-compatible changes, sandbox/production validation.
You are our ideal candidate if you:
- Have strong system design skills — able to own the architecture of a payment domain end-to-end: API contracts, data model, failure modes, idempotency, consistency guarantees, capacity and cost.
- Have deep Java (17/21) and Spring Boot 3.x expertise; are confident with concurrency, transactional boundaries, retry/backoff strategies and graceful degradation.
- Have production experience with event-driven architecture on Kafka — topic/partition design, ordering and delivery guarantees, consumer scaling, DLQ and replay, backward-compatible event evolution.
- Have advanced Postgres expertise — data modeling, indexing and query tuning, locking, zero-downtime and rollback-safe schema migrations (expand/contract).
- Have experience running services in Kubernetes/AWS (EKS, MSK, RDS, S3, IAM); are comfortable reading Terraform and Helm and reasoning about a GitOps delivery pipeline.
- Have experience with analytical/OLAP storage (ClickHouse, Opensearch or equivalent) — understand the trade-offs of a dual-path (OLTP + analytics) data flow.
- Treat observability as an engineering discipline: metrics, structured logs, distributed tracing, meaningful SLOs and alerts.
- Have strong payments domain expertise: authorize/capture/void/refund lifecycle, 3DS and challenge flows, chargebacks and disputes, PSP/acquirer integrations, routing and cascading, subscriptions and MIT/recurring billing, tokenization, PCI-DSS constraints.
- Have a practical security mindset — handling of card data, secrets management, least-privilege access, audit trails.
- Have ownership of engineering processes: code review culture, TDD/BDD, test pyramid (unit / integration / e2e), CI/CD, release and rollback procedures, incident management and postmortems.
Do you want to know some details about this position?
Kate will help!more details
Our hiring flow:
- Step 1: Pre-screen.
- Step 2: Technical interview with the CTO.
- Step 3: Interview with the CEO.
- Step 4: Reference Check.
- Step 5: Job Offer!
What you can expect from working with us:
- A chance to work on an early-stage payment product. You’ll have the opportunity to make architectural decisions, work with AI and high-level engineering, enjoy technical freedom, and directly influence the product’s development vector. The startup drive — backed by the stability and support of a holding company.
- From idea to action — minimal steps. Any proposal can turn into real changes in the product or processes. If you have an idea, it will be heard.
- Your office is wherever it’s convenient for you: home, our Kyiv office, coworking spaces in Lviv or Warsaw, or anywhere else with a stable Wi-Fi connection.
- Flexible working hours. Plan your day for maximum efficiency: start between 8:00 and 11:00 and finish between 17:00 and 20:00, considering team collaboration hours.
- Continuous growth is a must. Courses, conferences, and an internal library — we invest in your development because the team’s speed and performance directly depend on the expertise of its people.
- Health care and wellbeing: medical insurance, a Mental Health program, and compensation for sessions with a psychologist.
- Time to recharge: 28 paid days off per year, sick leave, and all public holidays fully covered.
- Gifts for special occasions. We celebrate important moments together — we give gifts to mark key milestones in your life and career.
- Social Impact. The Ukrainian Victory Support program and other charitable initiatives supporting Ukraine.
- An active corporate life: quarterly team buildings, workshops, and other holding-level events.
What you can expect from working with us:
Recommend a friend
apply
Haven’t found
a vacancy that
suits you?
Maybe we will find something to offer you
Send resume
