Jesse Rohner

Backend • Middle • 34 years • Available in 2 weeks • from $175k per year

Full Stack Developer

7+ years exp

Kotlin

Node JS

Java

Python

Swift

Objective-C

TypeScript

JavaScript

Active 7 days ago

+1 (972) 3633128

Invite to interview

Message

Download CVCV

Overview

Technical skills

Timeline

Roles

Overview

Fullstack developer (Middle level) focused on building interactive React frontends and Node TypeScript backends for small game-like experiences. The strongest proven skill is client-side interactive UI and UX as demonstrated by toss/src/pages/play.js which implements GIF/audio playback, image preloading, toast notifications and clear game flow state. There is limited evidence of systematic testing, production-grade request/cancellation handling, or hardened security and observability in the public code.

Technical skills

Kotlin

Node JS• Middle

Java

Python

Swift

Objective-C

TypeScript• Middle • 7y+

JavaScript• Middle

Node JS

Express

Mongoose

Axios

Dotenv

Multer

Databases

Amazon Aurora

TimescaleDB

MySQL

MongoDB

PostgreSQL• 7y+

Redis• 7y+

Frontend

Next.js

Material UI

Webpack

ESLint

React Router

React.js• 7y+

DevOps

gRPC

Platform Engineering

AWS• 7y+

CI/CD• 7y+

Rest API• 7y+

Jest

Mobile

React Native

AI/ML

LangChain

LangGraph

RAG

Timeline

Senior Full Stack Engineer • Senior

Bittensor • Full-Time

Dec 2023 to Present 2 Years 9 Months Partially remote

Owned cross-stack platform engineering across backend services, cloud infrastructure, APIs, data processing, and web applications in a distributed engineering environment. Worked on mobile-adjacent systems and supported end-to-end delivery across multiple layers of the product stack.

Senior Full Stack Engineer • Senior

X Socialmedia • Full-Time

Nov 2019 to Nov 2023 4 Years In office

Developed scalable backend, web, API, data, and cloud systems for customer-facing products with high-volume platform workloads. Architected and maintained distributed REST APIs and asynchronous processing flows, improved reliability, and reduced infrastructure incidents. Built CI/CD and infrastructure automation on AWS and delivered React/TypeScript frontend surfaces backed by production APIs.

AWS

CI/CD

TypeScript

React.js

Rest API

Redis

PostgreSQL

Software Engineer • Middle

Limelight Department • Full-Time

Mar 2016 to Nov 2019 3 Years 8 Months Oregon In office

Built and supported web applications, backend services, APIs, databases, and cloud-connected systems while developing core full-stack engineering skills. Contributed to production reliability improvements through backend and API work and ongoing system support.

Middle Backend Developer Confidence: Medium API Engineer

API-focused Node.js backend engineer at a middle level with a practical strength in building small REST services and integrating them with a browser frontend. The strongest proven skill is building and wiring REST endpoints with input validation and JWT auth middleware as implemented in src/controllers/coinflip.ts and src/middleware/auth.ts. The codebase lacks evidence of production-grade operational practices such as migrations, structured logging, robust retries, performance tuning, or distributed system design.

API Design

2/10

How well APIs are designed

Basic REST API structure and request validation exist but there is no versioning, inconsistent error contracts, and no idempotency or pagination design.

Evidence

superdev947/toss-backend/src/controllers/coinflip.ts: coinflip endpoints (getHash, playGame, storeGameData) implement request/response shapes without versioning or consistent error format superdev947/toss-backend/src/index.ts: mounts API under '/api' and serves routes but no versioning strategy superdev947/toss-backend/src/middleware/validation.ts: Joi + express-joi-validation used for input validation

Data Layer & Database

2/10

Working with databases

Uses Mongoose/MongoDB for persistence with simple queries and updates; no migration history, transaction handling, or tuned queries are present.

Evidence

superdev947/toss-backend/config/database.ts: mongoose connect bootstrap with no migration or schema evolution tooling superdev947/toss-backend/src/controllers/coinflip.ts: uses UserHash.findOne, updateOne and Wallets.find/findOneAndUpdate without transactions or isolation controls

Scalability & Performance

1/10

Handling load and speed

Little to no scalability or performance engineering: no caching, no queueing, no rate limiting and no documented load- or performance-oriented changes on the backend; small frontend preloads and a perf hook exist.

Evidence

superdev947/Face-Recognition-Flask/flask-frontend/src/reportWebVitals.js: perf hook present for frontend telemetry superdev947/toss/src/pages/play.js: preloads game images for perceived frontend performance

System Architecture

2/10

Overall system structure

Reasonable folder separation (routes, middleware, controllers, config) for a single-service app, but no multi-service decomposition, environment-aware config practices or secret management beyond dotenv.

Evidence

superdev947/toss-backend/src/index.ts: app wiring (connectDB, Routes, middleware) shows simple modularization superdev947/toss-backend/src/middleware/auth.ts and superdev947/toss-backend/src/middleware/validation.ts: separation of cross-cutting concerns

Security & Auth

3/10

Protecting data and access

Shows security awareness at the application layer: JWT middleware and Joi validation are present, but secrets handling, token lifecycle, and broader security practices are not fully surfaced.

Evidence

superdev947/toss-backend/src/middleware/auth.ts: JWT verification using JWTSECRET and setting req.userId superdev947/toss-backend/src/middleware/validation.ts: centralized Joi validation and express-joi-validation integration

Reliability & Observability

1/10

Stability and monitoring

Minimal reliability and observability: controllers use try/catch and console logging but there is no structured logging, no graceful shutdown, no retries with backoff, and no metrics/alerts integration.

Evidence

superdev947/toss-backend/src/controllers/coinflip.ts: try/catch with console.error and generic error responses superdev947/toss-backend/config/database.ts: on connection failure the process exits without retry or backoff logic

Expertise

Node.js• Middle

Industries

Financial Services• Middle

Gaming• Middle

Technologies

Python

Java

Kotlin

Node JS• Middle

MySQL

MongoDB

PostgreSQL• 7y+

Redis• 7y+

Rest API• 7y+

gRPC

Express

TimescaleDB

Multer

CI/CD• 7y+

AWS• 7y+

Axios

Dotenv

Platform Engineering

Amazon Aurora

Recommendations

Develop single-service Node.js REST APIs that integrate with MongoDB and frontend clients, focusing on input validation and auth flows.
Improve operational maturity by adding structured logging, metrics, health checks, graceful shutdown, and DB migration tooling before scaling to multi-service architectures.
Harden API contracts: adopt versioning, consistent error payloads, idempotency where needed, and add tests (unit and integration) for core game and wallet flows.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

toss-backend toss Face-Recognition-Flask

Middle Frontend Developer Confidence: Medium Fullstack

UI Component Architecture

3/10

How interface parts are built

Small, composable React components using MUI and some custom Styled components; reasonable composition but no evidence of a bespoke component system or advanced lifecycle hooks.

Evidence

superdev947/toss/src/pages/play.js: use of StyledButton and component composition in game UI superdev947/toss/src/components/VolumeButton.js: small stateful control component superdev947/toss/src/components/SocialLinks.js: composition of Icon buttons

Responsive & Cross-browser

3/10

Works on all screens and browsers

Responsive layout built with MUI sx breakpoints and fluid sizes; basic responsive care is present but no evidence of RTL/i18n strategies or advanced feature detection.

Evidence

superdev947/toss/src/pages/play.js: sx responsive widths for layout and images superdev947/toss/public/index.html: viewport meta and responsive font inclusion

Performance Optimization

2/10

Speed of the interface

Minor performance attention such as image preloading and disabling UI during async actions; no measured perf work, bundle-analysis artifacts, code-splitting strategy in the app code, or virtualization.

Evidence

superdev947/toss/src/pages/play.js: preloads images and disables toss button via isTossing superdev947/toss/src/pages/play.js: audio handling and GIF playback sequencing

Accessibility & Semantics

3/10

Usable for everyone

Some accessibility awareness via theme focus styles and use of MUI which has accessible defaults, but the app lacks explicit ARIA on custom widgets and has incomplete alt text and keyboard-focus handling in places.

Evidence

superdev947/react-typescript-mui-admin-boilerplate/src/theme/customizations/datePickers.ts: focus outline styles for keyboard focus superdev947/react-typescript-mui-admin-boilerplate/src/theme/customizations/dataGrid.ts: focus and hover styles for keyboard navigation

State Management & Data Flow

2/10

Managing data in the app

Simple local state and direct axios calls with basic server-side validation; no request cancellation, optimistic updates, or state machine patterns are present.

Evidence

superdev947/toss/src/pages/play.js: axios.post/axios.get usage without cancellation or retries superdev947/toss-backend/src/controllers/coinflip.ts: playGame and storeGameData server-side logic with basic argument checks

UX & Visual Polish

4/10

Look and feel quality

Good visual polish for a small interactive app - GIFs, audio, toast notifications, disabled action states and clear flows - though edge-state coverage and robust error UX are limited.

Evidence

superdev947/toss/src/pages/play.js: GIF and audio playback, toast notifications, isTossing disabled state and END STREAK flow superdev947/toss/src/pages/home.js: responsive hero and navigation to play route

Verified artifacts

SilverDigitalBus-LLC/.github• contrib

Expertise

React• Middle

Frontend Architecture & Build Tools• Middle

Industries

Blockchain & Crypto• Middle

Gaming• Middle

Technologies

Webpack

Next.js

React.js• 7y+

Mongoose

Material UI

ESLint

React Router

Recommendations

Build small-to-medium interactive web apps and gamified frontends with wallet integration and simple backends.
Implement end-to-end PoCs involving React + Node TypeScript where rapid UX iteration, audio/animation and state flows are primary.
Work on MUI theming and component library customization tasks, especially visual design systems and theme primitives.
Collaborate on front-end performance and reliability improvements such as request cancellation, retries, and adding tests and observability.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

toss-backend toss react-typescript-mui-admin-boilerplate

Middle QA Engineer Confidence: Medium Generalist

Full-stack web developer at a Middle level specializing in lightweight web3-enabled gaming frontends and Node/TypeScript backends. The strongest proven skill is building web3/frontend integrations and client-server flows demonstrated by yespace-frontend's use of wallet adapters and the axios client with interceptors (yespace-frontend/src/utils/axios.ts). The public code lacks automated test suites, CI pipelines, contract or negative-path testing, and formal QA artifacts.

Test Automation Frameworks

1/10

Building automated tests

Minimal test artifacts present (one React test file and test deps) but no test framework, fixtures, E2E, or isolated test infrastructure authored.

Evidence

superdev947/toss/src/App.test.js superdev947/toss/package.json

Test Coverage & Strategy

1/10

What and how to test

No risk-based test strategy, no negative-path/property-based tests, and no meaningful assertions beyond a placeholder test file.

Evidence

superdev947/toss/src/App.test.js superdev947/toss/README.md

API & Integration Testing

1/10

Testing how parts work together

API integration exists (Express routes, axios client) but there are no contract tests, schema validations in tests, or integration test containers; only app code and an axios interceptor handling 401.

Evidence

superdev947/toss-backend/src/index.ts superdev947/yespace-frontend/src/utils/axios.ts

Performance & Load Testing

Testing speed under load

Not evidenced in public code

Bug Reporting & Analysis

Finding and describing bugs

Not evidenced in public code

CI Test Integration

Running tests automatically

Not evidenced in public code

Industries

Blockchain & Crypto• Middle

Gaming• Middle

Technologies

JavaScript• Middle

TypeScript• Middle • 7y+

Jest

Recommendations

Develop small-to-medium web3-enabled consumer features such as wallet-integrated mini-games and airdrop submission flows that require tight frontend-backend integration.
Extend the backend with robust input validation, explicit error handling and add contract/integration tests for API endpoints using schema validation tools.
Add CI-driven unit and E2E test suites, and introduce test infrastructure (isolated fixtures, mock servers or testcontainers) to harden releases.

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

toss-backend toss yespace-frontend