Integration Engineer (Full-stack)

Sourceangel; Warszawa; On-site; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Equipment provided

Competitive salary

Job summary

Source Angel in Warsaw is seeking an experienced Integration Engineer (Full-Stack) to join a US-based team building the next generation of enterprise real estate integrations. You will own end-to-end integrations and work with product, engineering, and external APIs to deliver reliable experiences.

You will develop full-stack features using Node.js, React, and TypeScript, with a focus on backend architecture and scalable design.

Qualifications

• Strong fundamentals in APIs, data models, databases, authentication concepts, and application architecture.
• Hands-on experience with APIs and third-party integrations.
• Full-stack experience across backend and frontend using Node.js, TypeScript, PostgreSQL, and React.
• Fluent English with 4–5 hours overlap with US Central Time.

Responsibilities

• Own the end-to-end lifecycle of integrations, from design and development to deployment and ongoing optimization.
• Build and maintain scalable integrations with third-party platforms, APIs, and external services.
• Develop full-stack features using Node.js, React, and TypeScript, with a strong focus on backend architecture.
• Partner cross-functionally with Product, Design, and Engineering to deliver seamless, user-centric integration experiences.
• Diagnose and resolve complex integration issues, ensuring high reliability and uptime.

Skills

APIs & integrations

Full-stack development

Node.js

TypeScript

React

PostgreSQL

English communication

Tools

REST APIs

CRM integrations

Webhooks

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