Integration Engineer (Full-stack)

Source Angel; Warszawa; Hybrid; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Equipment provided

Attractive salary package

Job summary

Source Angel is seeking an experienced Integration Engineer (Full-Stack) to join a US-based team from Warsaw. You will design, build, and maintain integrations between our product and external systems, working across backend and frontend with a focus on API integrations and reliability.

The role requires solid Node.js, TypeScript, PostgreSQL, and React skills, a product mindset, and the ability to collaborate across product, design, and engineering teams while coordinating with US time zones.

Qualifications

• Strong API integration fundamentals and data modeling.
• Hands-on experience with APIs and third-party integrations.
• Full-stack capability across backend and frontend.
• Proficiency with Node.js, TypeScript, PostgreSQL and React.
• Product-focused mindset with clear value delivery, not just code.
• Ability to work independently and manage multiple workstreams.

Responsibilities

• Own end-to-end lifecycle of integrations from design to deployment and optimization.
• Build and maintain scalable integrations with third-party platforms and APIs.
• Develop full-stack features using Node.js, React, and TypeScript with backend emphasis.
• Collaborate with Product, Design, and Engineering for seamless user-centric integrations.
• Diagnose and resolve complex integration issues to ensure reliability and uptime.
• Manage multiple integration projects simultaneously balancing speed with quality.

Skills

API development

Full-stack development

Node.js

TypeScript

React

PostgreSQL

Data modeling

Authentication concepts

English communication

Job description

We are Source Angel - a Danish-rooted software company with development centers in Ukraine, Poland, and Romania. For 10+ years,we'vebeen building dedicated tech teams for global clients, focusing on long-term partnerships and a strong people-first culture.

Wefosteranenvironmentofrespect,transparency,andprofessionalgrowth,offeringengineersfreedomwithresponsibility,collaborativeScandinavianleadership,andaninternationalmindset.

WearelookingforanexperiencedIntegrationEngineer(Full-Stack)tojoina US-basedcompanybuildingthenextgenerationofenterpriserealestatetechnology,tobuildandmaintainintegrationsbetweentheproductandthird-partysystems.

AbouttheProject

Thisrolesitsattheintersectionofproduct,engineering,andexternalplatformsandisheavilyfocusedonpracticalAPIintegrationwork.You'llworkwithexistingproductandengineeringteamstounderstandintegrationgoals,investigateexternalAPIs,mapandtransformdata,implementintegrationlogic,troubleshootissues,andhelpdeliverreliableintegrationexperiences.Thisisagreatroleforastrongmid-levelengineerwhoiscomfortableworkingindependentlyoncethegoalandgeneraldirectionareclear.

Location:Warsaw (B2B)

Responsibilities:

• Owntheend-to-endlifecycleofintegrations,fromdesignanddevelopmenttodeploymentandongoingoptimization
• Buildandmaintainscalableintegrationswiththird-partyplatforms,APIs,andexternalservices
• Developfull-stackfeaturesusingNode.js,React,andTypeScript,withastrongfocusonbackendarchitecture
• Partnercross-functionallywithProduct, Design,andEngineeringtodeliverseamless,user-centricintegrationexperiences
• Diagnoseandresolvecomplexintegrationissues,ensuringhighreliabilityanduptime
• Managemultipleintegrationprojectssimultaneously,balancingspeedwithqualityandlong-termmaintainability

Requirements

Must-have:

• Strongsoftwareengineeringfundamentals,includingAPIs,datamodels,databases,authenticationconcepts,andapplicationarchitecture
• Hands-onexperienceworkingwithAPIsandthird-partyintegrations
• Solidfull-stackexperience,withtheabilitytocontributeacrossbackendandfrontendwhenneeded
• ExperiencewithNode.js,TypeScript,PostgreSQL,andReact
• Product-orientedmindsetwithafocusondeliveringrealuservalue,notjusttechnicaloutput
• Abilitytooperateindependently,prioritizeeffectively,andmanagemultipleworkstreams
• Strongcommunicationskills,fluentEnglish,with4-5hoursofoverlapwithUS Central Time

Nice-to-have:

• ExperienceintegratingwithCRMplatformsorenterpriseSaaStools
• FamiliaritywithRESTAPIs,webhooks,event-drivenarchitectures,andasyncworkflows
• Experienceinhigh-growthorfast-pacedstartupenvironments

WeOffer:

• Excitingprojectswithdynamicclients
• Weprovidethenecessaryequipmentforyourwork
• Anattractivesalarypackagematchingyourexperienceandresponsibilities