Senior Backend Engineer at Duplo

Responsibilities

Backend Development:


Design, develop, and maintain scalable, reliable backend systems using TypeScript and NestJS, with a focus on correctness in financial systems
Design robust service boundaries and maintainable architecture across distributed services
Architect and optimize PostgreSQL schemas for scale, including transaction handling, indexing strategy, and patterns that protect data correctness
Apply Redis effectively for caching, coordination, rate-limiting, and distributed locking.


Cloud Infrastructure:


Reason effectively about deployment safety, observability, scaling, and incident diagnosis in production environments running on Docker, Kubernetes, and AWS
Maintain strong operational understanding of configuration and secrets handling, runtime behaviour, and rollback strategy
Work closely with DevOps to ensure infrastructure decisions support reliability; treating infrastructure as a shared concern.


Technical Leadership:


Champion technical design and implementation for large, high-risk, or high-complexity initiatives
Break down complex technical requirements into manageable, well-sequenced work
Mentor and guide junior engineers, raising engineering standards through example
Make sound, well-reasoned decisions on architectural trade-offs, migration approaches, and rollout safety, and know when to escalate decisions with broader business impact.


Quality & Risk Ownership:


Understand edge cases in money movement and design with operational safety and compliance in mind, not just functional correctness
Drive thorough testing practices to ensure robust, reliable code before it reaches production
Take responsibility for overall outcomes, not just tasks.


Collaboration:


Work seamlessly with cross-functional partners including product, compliance, finance, operations, support, QA, DevOps, and external providers, communicating clearly and adapting your approach to whoever you are working with
Collaborate closely with fellow engineers through code review, pairing, and technical discussion, giving and receiving feedback in a way that raises the quality of the team's work, not just yours.


Documentation and Communication:


Create clear technical documentation for system designs, APIs, and processes
Communicate effectively with stakeholders through technical breakdowns and status updates.


Requirements

Technical Skills:


Minimum of 7 years of backend engineering experience, with deep expertise in TypeScript and NestJS
Strong command of PostgreSQL, including schema design for scale, transaction handling, and indexing strategy
Practical expertise with Redis for caching, coordination, rate-limiting, and distributed locking
Strong operational understanding of Docker, Kubernetes, and AWS
Experience working within Agile/Scrum methodologies.


Software Engineering:


Demonstrated experience in fintech systems, including orchestration, provider integration resilience, and compliance-sensitive design
Deep understanding of sound architectural trade-offs and patterns that protect correctness in financial systems
Strong commitment to writing clean, testable, maintainable code.


Professional Skills:


A track record of owning complex, high-stakes technical work from design through to production, and standing behind the outcomes
Strong communication skills, with the ability to work effectively across engineering, product, compliance, and external partners
A demonstrated habit of catching your own issues before they reach QA or production, and of treating failure as something to learn from rather than deflect.


Experience:


Experience mentoring or raising the technical standard of a team, not just delivering individually
Demonstrated experience working in fintech or another high-compliance industry.