Full Stack Engineer

TechTree; Warszawa; On-site; PLN 284,954 - 455,926; Full time

Benefits offered by this job

Equity: 0.05% - 0.3% real equity

Onsite in Warsaw; relocation to US to

Job summary

TechTree in Warsaw is seeking a Full Stack Engineer to join the core platform engineering team and contribute to the development, scalability, and reliability of mission-critical software supporting defence and supply chain operations.

You'll work closely with engineering leadership, founders, and customer-facing deployment teams to design, build, and maintain systems that integrate with complex legacy environments and support high-value, high-impact workflows.

Qualifications

• Shipping real projects end-to-end with production ownership.
• Strong SQL/PostgreSQL database design and reasoning.
• Commitment to software engineering standards and quality.
• Ability to thrive in fast-paced, high-accountability settings.

Responsibilities

• Full-stack platform development across frontend, backend, APIs, and databases.
• Integrations with legacy government and enterprise systems.
• Deliver customer-driven features that drive measurable outcomes.
• Uphold code quality through testing, docs, and reviews.
• Mentor and onboard new engineers as the team grows.

Skills

Experience in shipping projects

SQL databases (PostgreSQL)

Software engineering best practices

Fast-paced, high-accountability work

Willingness to relocate to the US

Job description

• Experience in shipping projects and products
• Knowledge of SQL databases, preferably Postgres
• Strong understanding of software engineering best practices
• Ability to work effectively in fast-paced, high-accountability environments
• Willingness to relocate to the US - mandatory

About the role

We're looking for a Full Stack Engineer to join the core platform engineering team and contribute directly to the development, scalability, and reliability of mission-critical software supporting defence and supply chain operations.

You'll work closely with engineering leadership, founders, and customer-facing deployment teams to design, build, and maintain systems that integrate with complex legacy environments and support high-value, high-impact workflows. No two days will be the same - from integrating with legacy government interfaces to architecting dynamic workflows, the scope is wide and the stakes are real.

Onboarding includes an on-site implementation. Expect late nights and direct customer pressure - everyone on the platform team goes through it, because experiencing forward-deployed reality is how you build software that actually works in the field.

What you'll work on

Full-stack platform development - design, develop, and maintain full-stack application functionality across frontend interfaces, backend services and APIs, and database schemas and data models.

Legacy system integrations - implement integrations with external systems including legacy government and enterprise platforms: ERPs, government procurement interfaces, and everything in between.

Customer-driven feature delivery - collaborate with forward-deployed teams to translate customer requirements into production-ready features that drive measurable revenue outcomes for clients.

Code quality and standards - ensure code quality through best practices, testing, documentation, and code reviews; set the standard for customer-centric engineering excellence.

Team mentorship and onboarding - support the onboarding and technical development of new engineering team members as the team grows.

What we look for

A track record of shipping - experience delivering real projects and products to production; you've owned things end-to-end

Solid knowledge of SQL databases, preferably PostgreSQL; comfortable designing schemas and reasoning about data models

Strong understanding of testing, documentation, code review, and the longer-term cost of shortcuts

High accountability in fast-moving environments - you set reliable deadlines, meet them, and communicate clearly when something is at risk

The team

A small, tight-knit engineering team working directly with founders and customer-facing deployment strategists. The structure is flat, the feedback is direct, and the work has real-world consequence. You'll have genuine ownership from day one - both in terms of equity and the code you're responsible for.

Salary: $75,000 - $120,000 depending on experience

Equity: 0.05% - 0.3% real equity - a meaningful slice at seed stage

Work model: Onsite, based in Warsaw. After 6 months, relocation to the US is required.

About AI powered operating system for distributors and OEMs

We're building the AI-native command centre for defence logistics. The US defence industrial base - distributors and manufacturers managing billions of dollars in supply chain - still runs on infrastructure built in the 1980s, stitched together with email threads, supplier quotes, PDFs, government solicitations, and archaic ERP exports.We're changing that. Our platform eliminates the manual bottlenecks slowing down critical national security workflows, helping defence distributors and manufacturers quote faster, win more contracts, and deliver the components that keep allied defence forces operational. We're at seed stage, moving fast, and building a small core engineering team to scale the platform.