Senior Backend Developer (TypeScript/Node.js)

• Technically strong with an architectural mindset — you don’t just write code, you design systems. You think about data flows, failure modes, and long-term maintainability before writing the first line.

• Opinionated and able to defend your decisions — you bring an expert perspective to technical discussions and can articulate trade-offs clearly to both engineers and stakeholders.

• Proactive problem-solver — you find issues before they become incidents and propose solutions without waiting to be asked.

• Product-driven — most of your time goes into shipping features and solving real user problems, not open-ended refactoring.

• Self-motivated and responsible — you thrive in small teams, enjoy autonomy, and take full ownership of the development process.

• 5+ years of production experience in backend development with Type Script/Node.js as the primary stack.

• 2+ years with NestJS in production — modules, providers, middleware, guards, interceptors, microservice architecture with custom transports.

• Deep PostgreSQL expertise — schema design, indexing (partial, GIN/GiST), query optimization, migrations with zero-downtime, database-per-service pattern.

• Hands-on microservices experience — not a monolith split into modules. You’ve dealt with inter-service communication (RPC + pub/sub), message brokers, idempotency, eventual consistency, saga/outbox patterns.

• System design experience — decomposing services, designing API contracts, data flow architecture, capacity planning. You can whiteboard a system and explain why you made each decision.

• Complex integration experience — you’ve built and maintained integrations with third-party APIs, payment systems, or similar external services in production. You know how to handle retries, circuit breakers, and graceful degradation.

• Performance engineering — profiling, caching strategies, load analysis, bottleneck identification. You can optimize a slow query and a slow service alike.

• Production blockchain experience (MUST-HAVE) — you’ve worked with on-chain transactions, multiple networks, and real user funds. You understand HD wallets (BIP32/BIP39), smart contracts, ABI, ERC-20/SPL tokens, and the differences between account-based and UTXO models. Experience with libraries like ethers.js, viem, and solana/web3.js.

• AI-driven development (MUST-HAVE) — you actively use AI tools (Claude, Copilot, Cursor) in your daily workflow. Beyond personal productivity, you have experience optimizing business or organizational processes with AI/LLMs—building automations, internal tools, or workflows powered by language models.

• Strong testing discipline — unit tests (Jest), integration tests with real databases, microservice testing.

• Security-conscious — in fintech and crypto, every code path can touch real user funds. You build accordingly.

• Skilled in technical research — evaluating trade-offs, testing hypotheses, and making data-driven architectural decisions.

• English proficiency at Upper-Intermediate. Fluent in the Russian language.

• Experience with NATS JetStream as a transport layer (streams, consumers, delivery policies).

• Observability: OpenTelemetry, Prometheus + Grafana, structured logging (pino), distributed tracing.

• Kubernetes beyond basics: Kustomize/Helm, deployment strategies, resource management.

• Fintech domain knowledge: PCI DSS, GDPR, KYC/AML, payment systems.

• Experience mentoring junior/middle developers.

• React basics for back-office UIs (functional components, hooks, Redux, Material-UI).

Interaction with other teams:

Close collaboration with Product, QA, Frontend, and Mobile. Cross-functional communication is an essential part of the role. Partially offload the Tech Lead: own architectural and technical decisions, independently drive complex integrations, and influence the platform's technical direction. This is not an executor role. We need someone with strong expert opinions who can be relied upon for key technical decisions.

Key results (30-60-90):

30 days: First features shipped to production. Deep dive into the stack, architecture, and domain (blockchain, fintech). Clear understanding of core services and how they interact.

60 days: Independently drives a complex integration or a major feature. Participates in architectural code reviews. Brings first proposals for improvements.

90 days: Makes architectural decisions on their scope. Influences technical direction. Partially offloads the Tech Lead in decision-making. Participates in planning.

Application. Submit your application and CV.

Application Review. Our team reviews your experience and qualifications.

HR Interview. An introductory conversation to discuss your professional background and expectations.

Technical Interview. Assessment of your technical expertise, system design skills, and relevant experience.

Team Lead Interview. A discussion focused on team fit, collaboration style, and alignment with engineering culture.

Offer. Receiving the offer and details about the next steps.