SDE III
Job Description
As an SDE 3 you will own critical, high-throughput payment microservices end-to-end: design, build, scale, and operate systems that move real money for users across multiple currencies and jurisdictions, with US, UK/EU, and global banking-partner requirements as a core part of the job. This is a senior individual-contributor role calibrated against SDE 3 / Senior Engineer, driving architecture decisions, mentoring engineers, and being the go-to owner for a payments domain, while staying hands-on in code daily. The core responsibilities for the job include the following: Payment Systems Ownership and Architecture: - Own payment microservices end-to-end design, build, deploy, and operate Node.js services (orders, payment, reconciliation, virtual accounts, payout orchestration) handling real-time financial transactions at scale. - Design for correctness and failure: idempotent, retry-safe, reconciliable systems where every transaction is traceable, auditable, and recoverable (partial failures, webhook replays, duplicate detection, distributed state machines). - Architect for scale and resilience across a distributed microservices architecture; make service-boundary and build-vs-buy decisions; address root causes rather than symptoms. Banking and Partner Integrations: - Drive integrations with banking and payment partners (e. g., banking and card providers/risk providers), API contracts, webhook handling, sandbox-to-production rollout, and reconciliation logic across multiple rails (ACH, SEPA, Faster Payments, wires). - Work with Risk and Compliance on KYC, AML, and fraud-control touchpoints in the payment flow. Infrastructure, CI/CD, and Operations: - Build and maintain CI/CD pipelines (Jenkins) for automated testing, blue/green or canary deployments, and rollback strategies for services that cannot tolerate downtime or data loss. - Operate infrastructure on AWS (ECS/EKS, Lambda, SQS/SNS, RDS, CloudWatch); contribute to infra-as-code, monitoring, alerting, and on-call runbooks for payment-critical systems. - Optimize the data layer: schema design and query performance in MongoDB, caching and rate-limiting strategies with Redis, and safe migration patterns for high-volume transactional collections. - Participate in on-call for payment-critical services, including incident response and postmortems. Technical Leadership and Collaboration: - Lead technical roadmaps; break down large, ambiguous payment initiatives into shippable milestones; write design docs/RFCs; drive consensus across engineering, product, risk, and operations. - Mentor and raise the bar on code and design reviews, coach mid-level engineers, and help hire and grow the team. - Uphold security and compliance best practices for handling PII/financial data in a regulated, PCI-DSS-adjacent environment. Requirements: - 5+ years of professional software engineering experience, with a significant portion building backend/distributed systems; prior experience in fintech, payments, on-and-offramp providers, or banking infrastructure strongly preferred. - Strong hands-on expertise in Node.js (TypeScript preferred) for performant, production-grade backend services. - Deep experience with MongoDB schema design, aggregation pipelines, indexing strategy, and performance tuning at scale. - Proficiency with Redis caching, distributed locks, rate limiting, and pub/sub patterns. - Proven experience designing and operating microservices architectures, including inter-service communication (REST/gRPC/event-driven via SQS/Kafka, ELK, New Relic, and Mixpanel), service discovery, and API contract design. - Solid understanding of CI/CD pipelines, with hands-on experience using Jenkins (pipeline-as-code, multi-stage builds, automated test gates). - Working knowledge of AWS infrastructure (ECS/EKS/Lambda), VPC networking basics, IAM, S3 RDS, and CloudWatch; infra-as-code (Terraform/CloudFormation) is a plus. - Strong grasp of distributed systems fundamentals: idempotency, eventual consistency, retries/backoff, circuit breaking, and failure isolation. - Track record of owning a service or domain end-to-end in production, including on-call responsibility. - Excellent written communication and comfortable authoring design docs/RFCs and explaining trade-offs to engineers and non-technical stakeholders (Risk, Ops, external partners). Nice-To-Haves: - Experience with payment rails (ACH, SEPA, Faster Payments, SWIFT/wires) or card processing. - Familiarity with banking partner integrations, webhook-driven reconciliation, or ledger/double-entry accounting systems. - Exposure to KYC/AML/fraud tooling. - Experience at a fintech/crypto-native company, payments processor, or Big Tech payments org. - Prior experience operating in a regulated environment (FCA, EMI/PI licensing context), given the UK/EU banking scope of this role. Company Summary Transak is a developer of integrations to onboard global users from fiat to crypto and back using local payment methods. This solves the important problem of allowing mainstream people and businesses to access crypto and blockchain. It does this by integrating local compliance, payment methods, and liquidity from around the world. Transak is backed by Consensys, The LAO, Lunex, and Mycelium Ventures. Transak is a single integration for applications to accept fiat-to-crypto deposits and withdrawals from a global user base. It does this by aggregating fiat on-ramps from around the world and abstracting away the complexity of local compliance, payment methods, and operations. The Transak product is a widget integration that can be integrated into an app in just a few lines of code. It provides a fiat on-ramp for the UK, Europe, and India for the app's end-user without leaving their site. Why Join Us - We are a fast-moving, fun, and international company made up of skilful team players. - We offer a transparent, open, and collaborative work environment. - We offer an opportunity to work closely with a proven executive team, board, and serial entrepreneurs. - We are backend by ConsenSys, you will be working with the industry experts
Required Skills
['MongoDB', 'Node', 'Node.js', 'NodeJS', 'distributed systems', 'microservices']
Additional Information
Source recruiter: Shefali Singh Source recruiter designation: Manager, TA Company tagline: Global fiat on/off-ramp for apps and wallets Employee count: 10 Company founded: 2019 Benefits: Holiday allowance, Free Snacks and drinks, ESOPs, Flexible working hours Company tech stack: Node.js, React.js, MongoDB, Redis, AWS, Blockchain Website: https://transak.com LinkedIn: https://www.linkedin.com/company/build-with-transak/about/ Instahyre score: NA Strong match: NA Accept outstation: true Company tagline: Global fiat on/off-ramp for apps and wallets Logo: https://media.instahyre.com/images/profile/base/employer/30630/f5d8fee3ce/1572883340821.webp