Senior Node.js Engineer

Eddy; Lima Metropolitana; Hybrid; PEN 60,000 - 80,000; Full time

Benefits offered by this job

Healthy work-life balance

International collaborative environment

Structured 5-day work week

Job summary

Tech9 is seeking a Senior Node.js Engineer in Lima, Peru to oversee critical fintech applications. This role demands expertise in backend services and PostgreSQL, ensuring data integrity and high-volume transaction processing.

The ideal candidate will have strong leadership skills and a deep understanding of compliance in a SOC 2 environment. Tech9 offers an international, collaborative atmosphere and a supportive work-life balance.

Qualifications

• 5+ years of experience in backend services with Node.js.
• Expert experience with PostgreSQL, including advanced query optimization.
• Hands-on experience with double-entry ledger systems.

Responsibilities

• Maintain and enhance backend services using Node.js.
• Write and optimize PostgreSQL queries ensuring data integrity.
• Integrate with core banking platforms and manage diverse authentication flows.

Skills

Node.js Expertise

PostgreSQL Fluency

Ledger & Financial Discipline

Domain Experience in Fintech

AWS Familiarity

Leadership Skills

Tools

AWS

PostgreSQL

Job description

# Senior Node.js EngineerApply for this jobLocationLima, PeruDepartmentEngineeringJob TypeFull-Time## DescriptionWe’re looking for a Senior Node.js Engineer to own, maintain, and scale mission-critical, production-grade fintech and banking applications. In this role, you will be responsible for shipping robust backend services, managing complex ledger systems, and handling high-stakes financial data pipelines where data integrity and production discipline are non-negotiable. Operating as a senior technical contributor, you will thrive in an environment that values deep technical ownership, elegant backend engineering over hype, and a meticulous approach to financial system architecture.## ResponsibilitiesYou’ll work closely with internal stakeholders and external banking infrastructure to deliver reliable, production-ready, and 100% quality-driven code for high-volume transaction processing and core ledger systems.### Development, Maintenance & Operations* Maintain, troubleshoot, and enhance core backend services utilizing Node.js within a modular monolith architecture.* Write, optimize, and maintain complex PostgreSQL queries, ensuring strict data integrity through proper use of transactions, locking, and isolation levels.* Own and enforce production discipline by implementing structured logs, monitoring system health via CloudWatch, and ensuring critical financial hot paths are completely resilient.### Project Lifecycle, API Integrity & Integrations* Integrate and maintain robust connections against core banking platforms and infrastructure vendors (such as Unit, Increase, Treasury Prime, FIS, Fiserv, etc.), managing diverse authentication flows and specifications.* Significantly enhance and operate our production double-entry ledger system, ensuring flawless execution of journal entries, debit/credit accounting, and balance derivation.* Support financial workflows with extreme precision, managing settlement processing, holds, releases, reversals, adjustments, and automated reconciliation processes.### Infrastructure & Compliance* Navigate and operate cloud infrastructure efficiently within AWS (utilizing IAM, RDS, CloudWatch, managed services, and security best practices).* Ensure system architectures and workflows rigorously align with compliance expectations, keeping in mind SOC 2 environment requirements and banking regulations (KYC, BSA/AML, sanctions screening, and GLBA).* Manage multi-rail deposit systems (ACH, Wire, Crypto) and external financial integrations with minimal supervision.## Qualifications* **Strong Node.js Expertise:** 5+ years of professional experience shipping scalable, highly reliable backend services to production environments.* **PostgreSQL Fluency:** Expert-level experience with relational databases in production, including advanced query optimization, transaction management, locking strategies, and data integrity enforcement.* **Ledger & Financial Discipline:** Hands-on experience building, operating, or scaling production double-entry ledger systems with real-world knowledge of handling balance derivation and reconciliation challenges.* **Domain Experience:** Prior experience in fintech, payments, neobanking, or digital wallets, including a solid grasp of ACH processing and settlement workflows.* **AWS & Compliance Familiarity:** Strong understanding of AWS infrastructure and security best practices within a regulated SOC 2 environment.* **Leadership & Mindset:** Experience serving as a technical lead, providing constructive code reviews, mentoring peers, and effectively communicating technical concepts to engineering, product, and business stakeholders.## You'd be a poor fit if:* You view double-entry accounting as "just simple database entries" and underestimate the complexity of race conditions, ledger locking, and real-time balance derivation.* You prefer chasing the latest trending framework over maintaining the stability, integrity, and scale of a production modular monolith.* You ship financial logic updates or structural backend changes without updating the relevant system documentation.* You prefer working in isolation rather than mentoring team members and collaborating across engineering and business teams.## What you’ll love about us* A fast-growing company with meaningful, mission-critical financial infrastructure projects.* An international, collaborative work environment that values deep technical expertise and engineering discipline.* A healthy work-life balance with a structured 5-day work week.