Senior Software Engineer

Job Description

**Job Title:**
**Senior Software Engineer**
– TypeScript to Java

(Full-Time – W2 only)

(H1B transfer ok)

**Location:**
Client location – Newark, CA (Hybrid)

**Duration:**
6–12 months (with potential extension/full-time)

**Experience Level:**
10–15 Years

**Start Date:**
ASAP

**About the Role**

We’re looking for a
**hands-on, senior-level engineer**
with a proven track record of
**large-scale, complex system migrations**
—specifically from
**NestJS/TypeScript to Java**
. You’ll play a
**mission-critical role**
in helping us re-architect and rebuild a key part of our platform, ensuring performance, maintainability, and scalability as we shift our backend foundation.

This is not a hand-holding role. We want someone who:

* **Owns the outcomes, not just the code.**
* Can
**hit the ground running**
with minimal onboarding
* Thrives in
**ambiguous, high-impact environments.**

**Key Responsibilities**

* Lead the end-to-end
**migration from a NestJS/TypeScript backend to a Java-based architecture**
.
* Translate business-critical features from the old system into clean, performant, scalable Java code.
* Collaborate closely with product managers, engineers, and DevOps to ensure a smooth transition with minimal disruption.
* Define and execute migration strategy, tooling, automation, and phased rollout plans.
* Work directly with
**SQL databases**
to map, migrate, and optimize schema and queries as needed for the new Java-based system.
* Ensure backwards compatibility (where needed) and guide system integration testing.
* Identify architectural improvements and technical debt, and build long-term foundations during the migration.

**Required Experience**

* 10–15 years of backend engineering experience, with at least
**2 large-scale system migrations**
completed.
* Deep hands-on expertise in
**Java (Spring Boot preferred)**
and
**TypeScript/NestJS**
.
* Strong
**SQL database experience**
—you can read, write, refactor, and optimize complex queries and schemas (PostgreSQL or MySQL preferred).
* Excellent understanding of backend architecture, REST APIs, data modeling, and cloud-native systems.
* Experience designing for performance, reliability, and maintainability at scale.
* Ability to work
**independently**
, take
**end-to-end ownership**
, and communicate clearly across teams.

**Nice to Have**

* Experience with microservices, message queues, and distributed systems.
* Familiarity with CI/CD pipelines, observability tooling, and containerized deployments (Docker, Kubernetes).
* Experience working with ORMs in both TypeScript and Java environments (TypeORM, Hibernate, etc.).
* Prior exposure to high-availability or regulated system environments.