Full Stack Engineer (Warsaw)

SalesPatriot; Warszawa; On-site; PLN 410,000 - 558,000; Full time

Benefits offered by this job

Founding experience

Real equity

Direct national impact

Immediate feedback loop

Collaborate with brilliant teammates

Job summary

A tech innovation company is seeking a Full Stack Engineer to join their platform team. In this role, you will collaborate with leaders and team members to deliver high-value features that enhance U.S. defense logistics. Ideal candidates should have strong expertise in TypeScript and JavaScript, along with experience in developing full-stack applications. You will contribute to the growth of the company and help shape its culture and technical excellence.

Qualifications

• Experience in shipping projects and products.
• Proficiency in TypeScript, JavaScript, and a frontend library.
• Knowledge of SQL databases, preferably Postgres.

Responsibilities

• Contribute to core platform code, building frontend and backend components.
• Communicate with forward deployed teams to create revenue-driving features.
• Train and onboard new team members.
• Manage timelines and deliver features that impact revenue.

Skills

TypeScript

JavaScript

Frontend library (React, Svelte, Next)

SQL (Postgres preferred)

Tools

PostgreSQL

Job description

Our Mission

America’s defense industrial base runs on infrastructure built in the 1980s. Distributors and manufacturers managing our supply chain still manually stitch together email threads, supplier quotes, PDFs, government solicitations, and archaic ERP exports to manage billions of dollars passing through our supply chain in component level assemblies.

SalesPatriot changes that.

We're building the AI-native command center for U.S. defense logistics, eliminating the manual bottlenecks slowing down critical national security workflows. From F-35 bearings to Blackhawk rotor hubs, we’re helping distributors and manufactures quote faster, win more, and deliver the parts that keep NATO safe.

Quick Facts

• YC W25 company. Top 5% growth in batch

• Raised $6M+ seed, on a hyper-growth trajectory

• Backed by YC, SV Angel, Pear VC, and CRV

• We work 12–15 hour days because we’re obsessed with the mission

Full Stack Engineer

If you don’t know TypeScript and at least one JS-based frontend framework, don’t apply.

What you’ll do

As a Full Stack Engineer at SalesPatriot, you will work on the platform team, collaborating with the founders and Deployment Strategists to deliver immense value to our customers and position SalesPatriot as a category-defining solution in the supply chain.

Your code will be the backbone of the defense and supply chain infrastructure for the decades to come. From integrating with ancient government interfaces to architecting hyper-dynamic workflows - no two days will be the same, but here are some things to expect :

• Contribute to the core platform code, building frontend components, backend functionality, and database architecture

• Communicate with the forward deployed team to create features that actually drive millions of dollars in revenue for our clients

• Be a code‑quality pitbull – suggest good practices and bully everyone into writing high quality code

• Manage timelines – if you say that a massive ERP ingestor will be built out in two weeks, millions of dollars will be on the line based on your timely delivery

• Train and onboard new team members

• Trial by fire: you will be onboarded during an on‑site implementation. Expect late nights and pressure from the customer – everyone, including the platform team, needs to experience the forward deployed hell.

What is success in this role?

• You ship code that is useful, maintainable, and clean.

• You communicate clearly with the founders, Deployment Strategists and Senior Software Engineers. That means:

  • Articulating ideas understandably and convincingly

  • Setting reliable deadlines and meeting them

  • Voicing concerns and justifying your stance

• You set the standard for yourself and others for customer‑centric engineering excellence. That means:

  • Code is a means to an end – you program to deliver value to the customer

  • You understand the weight of your contributions, and can be trusted to own them end‑to‑end

  • You mercilessly hunt down bad practices that will be detrimental long‑term, while understanding that sometimes, compromises need to be made.

What you should bring to the table

• Experience in shipping projects and products. Be ready to show us at least one full‑stack project (GitHub repo / web app / Loom demo video), or don’t contact us at all.

• Proficiency in TypeScript, JavaScript, and at least one frontend library (React, Svelte, Next etc)

• Knowledge of SQL databases, preferably Postgres

• Low ego, curiosity, and intellectual honesty – let’s face it: you’ll be constantly torn between the pursuit of engineering excellence and the urgency of deadlines . The only way this works is if you focus on outcomes, not “being right”.

Why Join Us

• Founding Experience: Help define the culture, roadmap, and the team from the ground up.

• Real Equity: You’ll own a meaningful slice of a rocket ship.

• Direct National Impact: Your work will influence how defense logistics function in the U.S.

• Immediate Feedback Loop: No waiting around – you’ll see your work change lives in days.

• No B‑Team: You’ll work with brilliant, gritty teammates who push hard and play to win.